Basic Pneumatic Circuitry plunger

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Basic Pneumatic Circuitry plunger Powered By Docstoc
					    Manual control
                                                          -       +
   Remote manual control of
    a double acting cylinder
   Valve marked + will cause
    the cylinder to outstroke
    or move plus
   Valve marked - will cause                             4       2
                                               14                     12
    the cylinder to instroke or
    move minus                                            5   1 3

   The 5/2 double pilot valve
    is bi-stable therefore the                      2                          2
    push button valves only           12             10           12            10
    need to be pulsed             +        3        1                      3   1
                                                              -




                              RNDPOOLS                                             Ju Yeal Jeon
    Manual control
                                                   -           +
   Remote manual control of
    a double acting cylinder
   Valve marked + will cause
    the cylinder to outstroke
    or move plus
   Valve marked - will cause                          4       2
                                                  14                12
    the cylinder to instroke or
    move minus                                         5   1 3

   The 5/2 double pilot valve
    is bi-stable therefore the                2                          2
    push button valves only              12        10          12         10
    need to be pulsed             +       3   1                     3    1
                                                           -




                              RNDPOOLS                                       Ju Yeal Jeon
    Manual control
                                                      -           +
   Remote manual control of
    a double acting cylinder
   Valve marked + will cause
    the cylinder to outstroke
    or move plus
   Valve marked - will cause                             4       2
                                                     14                12
    the cylinder to instroke or
    move minus                                            5   1 3

   The 5/2 double pilot valve
    is bi-stable therefore the                 2                            2
    push button valves only           12        10                12         10
    need to be pulsed             +        3   1                       3    1
                                                              -




                              RNDPOOLS                                          Ju Yeal Jeon
    Manual control
                                                          -       +
   Remote manual control of
    a double acting cylinder
   Valve marked + will cause
    the cylinder to outstroke
    or move plus
   Valve marked - will cause                             4       2
                                               14                     12
    the cylinder to instroke or
    move minus                                            5   1 3

   The 5/2 double pilot valve
    is bi-stable therefore the                      2                               2
    push button valves only           12             10                    12                 10
    need to be pulsed             +        3        1                           3   1
                                                              -




                              RNDPOOLS                                                  Ju Yeal Jeon
    Manual control
                                                          -       +
   Remote manual control of
    a double acting cylinder
   Valve marked + will cause
    the cylinder to outstroke
    or move plus
   Valve marked - will cause                             4       2
                                               14                     12
    the cylinder to instroke or
    move minus                                            5   1 3

   The 5/2 double pilot valve
    is bi-stable therefore the                      2                          2
    push button valves only           12             10           12            10
    need to be pulsed             +        3        1                      3   1
                                                              -




                              RNDPOOLS                                             Ju Yeal Jeon
    Semi-automatic control
   Manual remote start of a                             -           +                a1

    double acting cylinder                         A
    with automatic return
   Cylinder identified as “A”
   Trip valve operated at the
    completion of the plus                                   4       2
                                              14                         12
    stroke identified as “a1”
                                                             5   1 3



                                                   2                              2
                                     12             10               12            10

                                 +        3        1             -       a1   3   1




                             RNDPOOLS                                                 Ju Yeal Jeon
           Fully-automatic control
                            -        +        a0           a1
                                                                          Continuous automatic
                      A                                                    cycling from roller
                                                                           operated trip valves
                                                                          Manual Run and End of
                                                                           the automatic cycling
                                4    2
                 14                      12                               Cylinder will come to rest
                                                                           in the instroked position
                                5   1 3
                                                                           regardless of when the
                      2
                       10                                                  valve is put to End
12
Run/End     3         1
                                                                          Tags for the roller
                      2                                2                   feedback valves a0 and
          12                10        12                10                 a1 show their relative
          a0 3        1                  a1        3   1                   positions



                                                                RNDPOOLS                           Ju Yeal Jeon
Sequential control




        RNDPOOLS     Ju Yeal Jeon
    Circuit building blocks
                      a0   a1                  b0   b1
                  A                        B




        Run/End




   These circuits can be considered as building blocks for
    larger sequential circuits consisting of two or more
    cylinders
   Each actuator will have a power valve and two associated
    feedback valves. The first actuator to move also has
    a Run/End valve

                                RNDPOOLS                   Ju Yeal Jeon
    Repeat pattern sequence
   A repeat pattern                The signal starting the
    sequence is one where            first movement must pass
    the order of the                 through the Run/End
    movements in the first           valve
    half of the sequence is         Examples of repeat
    repeated in the second           pattern sequences:
    half                            A+ B+ C+ D+ A- B- C- D-
   There may be any number         A- B+ C- A+ B- C+
    of actuators in the
    sequence                        C+ A+ B- C- A- B+




                          RNDPOOLS                         Ju Yeal Jeon
    Repeat pattern sequence
                           a0   a1                       b0   b1
                  A                                  B




        Run/End


            b0        b1                        a1       a0


   The two cylinders A and B are to perform a simple repeat
    pattern sequence as follows: A+ B+ A- B-
   Apply the rule “The signal given by the completion of each
    movement will initiate the next movement”
   In this way the roller valves can be
    identified and labelled

                                     RNDPOOLS                      Ju Yeal Jeon
    Repeat pattern sequence
                   a0   a1                   b0   b1            c0     c1
          A                       B                         C




Run/End


    c0        c1             a1              a0        b1       b0


   For three cylinders A, B and C also to perform a simple
    repeat pattern sequence as follows: A+ B+ C+ A- B- C-
   Apply the rule “The signal given by the completion of each
    movement will initiate the next movement”



                                  RNDPOOLS                       Ju Yeal Jeon
    Non-repeat pattern sequence
                           a0   a1                            b0   b1
                  A                                  B




        Run/End


            a0        b0                        a1       b1


   If the rule applied to a repeat pattern sequence is applied
    to any other sequence there will be opposed signals on
    one or more of the 5/2 valves preventing operation
   This circuit demonstrates the problem
   The sequence is A+ B+ B- A-


                                     RNDPOOLS                           Ju Yeal Jeon
    Opposed signals
                           a0   a1                            b0   b1
                  A                                  B




        Run/End


            a0        b0                        a1       b1


   When the valve is set to Run, cylinder A will not move
    because the 5/2 valve has an opposed signal, it is still
    being signalled to hold position by the feedback valve b0
   If A was able to move + a similar problem will occur for the
    5/2 valve of B once it was +
   The sequence is A+ B+ B- A-

                                     RNDPOOLS                           Ju Yeal Jeon
    Mechanical solution
                           a0   a1                            b0   b1
                  A                                  B




        Run/End


            a0        b0                        a1       b1


   The problem was caused by valves b0 and a1 being
    operated at the time the new opposing instruction is given
   If these two valves were “one way trip” types and over
    tripped at the last movement of stroke, only a pulse would
    be obtained instead of a continuous signal


                                     RNDPOOLS                           Ju Yeal Jeon
    Sequence solution methods
   The main solutions to                Shift register circuits are
    solving sequences are:                similar to cascade but
        Cascade (pneumatic)              use one logic valve for
        Shift register                   every step
         (pneumatic)                     Electro-pneumatic
        Electro-pneumatic                circuits use solenoid
        PLC (Programmable                valves and electro-
         logic controller)                mechanical relays
   Cascade circuits provide             PLC. The standard
    a standard method of                  solution for medium to
    solving any sequence. It              complex sequential
    uses a minimum of                     systems (except where
    additional logic hardware             electrical equipment
    (one logic valve per group            cannot be used)
    of sequential steps)

                               RNDPOOLS                             Ju Yeal Jeon
    Cascade two group
   The A+ B+ B- A- circuit is             Because only one group
    solved by the two group                 output is available at a
    cascade method                          time it is not possible to
   The sequence is divided                 have opposed signals
    at the point where B                   A standard 5/2 double
    immediately returns                     pressure operated valve
   The two parts are                       is the cascade valve
    allocated groups l and ll
                                               Group l        Group ll
   Gp l A+ B+ / Gp ll B- A-
   Two signal supplies are                              4    2
                                                    14         12
    provided from a 5/2 valve
    one is available only in             Select l        5   1 3    Select ll
    group l the other is
    available only in group ll


                                 RNDPOOLS                                Ju Yeal Jeon
Cascade (two group)
                    a0        a1                       b0   b1
           A                                  B




                         b0

                                        a1
 Gp l

 Gp ll

                                                  Sequence
                                                  Gp l A+ B+ Gp ll B- A-
     Run/End



               a0                  b1




                                   RNDPOOLS                          Ju Yeal Jeon
Cascade (two group)
                    a0        a1                       b0   b1
           A                                  B




                         b0

                                        a1
 Gp l

 Gp ll

                                                  Sequence
                                                  Gp l A+ B+ Gp ll B- A-
     Run/End



               a0                  b1




                                   RNDPOOLS                          Ju Yeal Jeon
Cascade (two group)
               a0        a1                       b0   b1
           A                             B




                    b0

                                    a1
 Gp l

 Gp ll

                                             Sequence
                                             Gp l A+ B+ Gp ll B- A-
     Run/End



         a0                   b1




                              RNDPOOLS                          Ju Yeal Jeon
Cascade (two group)
               a0   a1                        b0   b1
           A                         B




               b0

                                a1
 Gp l

 Gp ll

                                         Sequence
                                         Gp l A+ B+ Gp ll B- A-
     Run/End



         a0                b1




                         RNDPOOLS                           Ju Yeal Jeon
Cascade (two group)
               a0        a1                       b0   b1
           A                             B




                    b0

                                    a1
 Gp l

 Gp ll

                                             Sequence
                                             Gp l A+ B+ Gp ll B- A-
     Run/End



         a0                   b1




                              RNDPOOLS                          Ju Yeal Jeon
Cascade (two group)
                    a0        a1                       b0   b1
           A                                  B




                         b0

                                        a1
 Gp l

 Gp ll

                                                  Sequence
                                                  Gp l A+ B+ Gp ll B- A-
     Run/End



               a0                  b1




                                   RNDPOOLS                          Ju Yeal Jeon
    Cascade building blocks
   A two group building
    block consists of a lever
    valve to run and end the                                              Gp l
    sequence plus the 5/2
    double pilot operated                                                 Gp ll
                                                            4    2
    cascade valve                                      14            12
   For a two group system
                                                            5   1 3       Sel ll
    consisting of any number       Run/End
                                                 2
    of cylinders this building                    10
    block and the cylinder        12
                                             3   1
    building blocks are all         Sel l
    that is required to solve
    the sequence




                             RNDPOOLS                                      Ju Yeal Jeon
    Cascade building blocks
   This three group                        Gp l
    building block
    establishes an     Run/End
    interconnecting
    pattern that can
                                            Gp ll
    be extended to     Sel l
    any number of
                       Sel ll
    groups

                                            Gp lll

                       Sel lll




                                 RNDPOOLS   Ju Yeal Jeon
    Dual trip building blocks
   When a sequence has a                                             Send A+
    cylinder operating twice
                                                                       a1 in x
    in one overall sequence a
    dual trip building block                                           a1 in y
    may be required for each
    of the two feedback
    valves                             A+ in                  A+ in
   The supply will be from            Group x                Group y
    different groups and the
                                        a1
    output go to different
    destinations
   Example is for feedback
    valve a1 of cylinder A         Note: can often be rationalised to less
                                   than these three components
    when A is sent + both in
    Group x and Group y

                            RNDPOOLS                                     Ju Yeal Jeon
    Cascade rules
   Establish the correct               Interconnect the blocks as
                                         follows:
    sequence
                                        The first function in each group
   Divide the sequence in to            is signalled directly by that
    groups. Always start a               group supply
    sequence with the                   The last trip valve operated in
    Run/End valve selecting              each group is supplied with
                                         main supply air and selects the
    group l e.g.                         next group
    R/E | A+ B+ | B- C+ | C- A-         The remaining trip valves are
   Select the cylinder                  supplied with air from their
    building blocks                      respective groups and initiate
                                         the next function
   Select the cascade                  The “run/end” valve will control
    building block                       the signal from the last trip
   Select dual trip building            valve to be operated
    blocks if required


                              RNDPOOLS                                 Ju Yeal Jeon
Logic functions for poppet and
         spool valves




              RNDPOOLS           Ju Yeal Jeon
    Logic AND
   To obtain the output Z
    both plungers X AND Y                          Z
    must be operated and
                                                       2
    held                                      12        10
                                          Y
   If X only is operated the                      3   1
    air will be blocked at port
    1 in valve Y
   If Y only is operated there                        2
                                              12        10
    will be no pressure                   X
    available at port 1                            3   1

   If either X or Y is released
    the output signal Z will be
    lost



                               RNDPOOLS                      Ju Yeal Jeon
    Logic AND
   To obtain the output Z
    both plungers X AND Y                               Z
    must be operated and
                                                            2
    held                                      12             10
                                          Y
   If X only is operated the                       3       1
    air will be blocked at port
    1 in valve Y
   If Y only is operated there                             2
                                                   12             10
    will be no pressure                   X
    available at port 1                             3       1

   If either X or Y is released
    the output signal Z will be
    lost



                               RNDPOOLS                                Ju Yeal Jeon
    Logic AND
   To obtain the output Z
    both plungers X AND Y                          Z
    must be operated and
                                                       2
    held                                      12        10
                                          Y
   If X only is operated the                      3   1
    air will be blocked at port
    1 in valve Y
   If Y only is operated there                        2
                                              12        10
    will be no pressure                   X
    available at port 1                            3   1

   If either X or Y is released
    the output signal Z will be
    lost



                               RNDPOOLS                      Ju Yeal Jeon
    Logic AND
   To obtain the output Z
    both plungers X AND Y                               Z
    must be operated and
                                                            2
    held                                           12             10
                                          Y
   If X only is operated the                       3       1
    air will be blocked at port
    1 in valve Y
   If Y only is operated there                             2
                                              12             10
    will be no pressure                   X
    available at port 1                             3       1

   If either X or Y is released
    the output signal Z will be
    lost



                               RNDPOOLS                                Ju Yeal Jeon
    Logic AND
   To obtain the output Z
    both plungers X AND Y                          Z
    must be operated and
                                                       2
    held                                      12           10
                                          Y
   If X only is operated the                  3       1
    air will be blocked at port
    1 in valve Y
   If Y only is operated there                        2
                                              12           10
    will be no pressure                   X
    available at port 1                        3       1

   If either X or Y is released
    the output signal Z will be
    lost



                               RNDPOOLS                         Ju Yeal Jeon
    Logic AND
   To obtain the output Z
    both plungers X AND Y                               Z
    must be operated and
                                                            2
    held                                           12             10
                                          Y
   If X only is operated the                       3       1
    air will be blocked at port
    1 in valve Y
   If Y only is operated there                             2
                                              12             10
    will be no pressure                   X
    available at port 1                             3       1

   If either X or Y is released
    the output signal Z will be
    lost



                               RNDPOOLS                                Ju Yeal Jeon
    Logic AND
   To obtain the output Z
    both plungers X AND Y                          Z
    must be operated and
                                                       2
    held                                      12        10
                                          Y
   If X only is operated the                      3   1
    air will be blocked at port
    1 in valve Y
   If Y only is operated there                        2
                                              12        10
    will be no pressure                   X
    available at port 1                            3   1

   If either X or Y is released
    the output signal Z will be
    lost



                               RNDPOOLS                      Ju Yeal Jeon
    Logic AND
   This method must not be
    used as a two handed                       Z
    safety control
                                                   2
                                          12        10
   It is too easy to abuse.
                                      Y
    e.g. one of the buttons                    3   1
    could be permanently
    fixed down and the
    system operated from the                       2
    other button only                     12        10
                                      X
   Use the purpose                            3   1
    designed two handed
    safety control unit




                           RNDPOOLS                      Ju Yeal Jeon
    Logic OR
   Use of an „OR‟ function
    shuttle valve
                                                         Z
   Source X and Y can be
    remote from each other
    and remote from the
    destination of Z
   When X or Y is operated                                  12
                                                                      2
                                                                       10
    the shuttle valve seal                               Y
    moves across to prevent                                       3   1

    the signal Z from being                        2
                                          12        10
    lost through the exhaust          X
                                               3   1
    of the other valve




                               RNDPOOLS                                   Ju Yeal Jeon
    Logic OR
   Use of an „OR‟ function
    shuttle valve
                                                        Z
   Source X and Y can be
    remote from each other
    and remote from the
    destination of Z
   When X or Y is operated                                 12
                                                                     2
                                                                      10
    the shuttle valve seal                             Y
    moves across to prevent                                      3   1

    the signal Z from being                        2
                                          12           10
    lost through the exhaust          X
                                               3   1
    of the other valve




                               RNDPOOLS                                  Ju Yeal Jeon
    Logic OR
   Use of an „OR‟ function
    shuttle valve
                                                         Z
   Source X and Y can be
    remote from each other
    and remote from the
    destination of Z
   When X or Y is operated                                  12
                                                                      2
                                                                       10
    the shuttle valve seal                               Y
    moves across to prevent                                       3   1

    the signal Z from being                        2
                                          12        10
    lost through the exhaust          X
                                               3   1
    of the other valve




                               RNDPOOLS                                   Ju Yeal Jeon
    Logic OR
   Use of an „OR‟ function
    shuttle valve
                                                         Z
   Source X and Y can be
    remote from each other
    and remote from the
    destination of Z
   When X or Y is operated                                  12
                                                                      2
                                                                                10
    the shuttle valve seal                               Y
    moves across to prevent                                       3   1

    the signal Z from being                        2
                                          12        10
    lost through the exhaust          X
                                               3   1
    of the other valve




                               RNDPOOLS                                   Ju Yeal Jeon
    Logic OR
   Use of an „OR‟ function
    shuttle valve
                                                         Z
   Source X and Y can be
    remote from each other
    and remote from the
    destination of Z
   When X or Y is operated                                  12
                                                                      2
                                                                       10
    the shuttle valve seal                               Y
    moves across to prevent                                       3   1

    the signal Z from being                        2
                                          12        10
    lost through the exhaust          X
                                               3   1
    of the other valve




                               RNDPOOLS                                   Ju Yeal Jeon
    Logic NOT
   A logic NOT applies to the
    state of the output when
    the operating signal is
    present (the output is
    simply an inversion of the                   Z
    operating signal)                                2
                                            12        10
   The valve shown is a                X
    normally open type (inlet                    1   3

    port numbered 1)
   When the signal X is
    present there is NOT
    output Z
   When X is removed
    output Z is given


                             RNDPOOLS                      Ju Yeal Jeon
    Logic NOT
   A logic NOT applies to the
    state of the output when
    the operating signal is
    present (the output is
    simply an inversion of the                   Z
    operating signal)                                2
                                            12           10
   The valve shown is a                X
    normally open type (inlet                    1   3

    port numbered 1)
   When the signal X is
    present there is NOT
    output Z
   When X is removed
    output Z is given


                             RNDPOOLS                         Ju Yeal Jeon
    Logic NOT
   A logic NOT applies to the
    state of the output when
    the operating signal is
    present (the output is
    simply an inversion of the                   Z
    operating signal)                                2
                                            12        10
   The valve shown is a                X
    normally open type (inlet                    1   3

    port numbered 1)
   When the signal X is
    present there is NOT
    output Z
   When X is removed
    output Z is given


                             RNDPOOLS                      Ju Yeal Jeon
    Logic MEMORY
   A logic MEMORY allows
    the output signal state
    (ON or OFF) to be
    maintained after the input
    signal has been removed                          Z
   Any bi-stable valve is a            X
    logic MEMORY                            12            10
                                                 3       1
   With this lever detented            Y
    valve, once the lever has
    been moved X direction
    or Y direction it can be
    released and will stay in
    that position




                             RNDPOOLS                          Ju Yeal Jeon
    Logic MEMORY
   A logic MEMORY allows
    the output signal state
    (ON or OFF) to be
    maintained after the
    signal that set it has been                       Z
    removed
                                             12           10
                                         X                     Y
                                                  3       1




                              RNDPOOLS                         Ju Yeal Jeon
    Logic MEMORY
   A bi-stable double pilot
                                                           Z
    valve can be set or reset
    simply by a pulse (push                     12             10
    and release) on buttons X
                                                       3       1
    or Y

                                                                        2
                                                               12        10
                                                       Y
                                                                    3   1
                                                 2
                                       12         10
                                   X
                                            3    1




                            RNDPOOLS                                     Ju Yeal Jeon
    Logic MEMORY
   A bi-stable double pilot
                                                         Z
    valve can be set or reset
    simply by a pulse (push                         12             10
    and release) on buttons X
                                                     3        1
    or Y

                                                                        2
                                                              12         10
                                                         Y
                                                                    3   1
                                                2
                                       12                10
                                   X
                                            3   1




                            RNDPOOLS                                     Ju Yeal Jeon
    Logic MEMORY
   A bi-stable double pilot
                                                          Z
    valve can be set or reset
    simply by a pulse (push                         12             10
    and release) on buttons X
                                                      3       1
    or Y

                                                                        2
                                                              12         10
                                                         Y
                                                                    3   1
                                                2
                                       12        10
                                   X
                                            3   1




                            RNDPOOLS                                     Ju Yeal Jeon
    Logic MEMORY
   A bi-stable double pilot
                                                           Z
    valve can be set or reset
    simply by a pulse (push                     12             10
    and release) on buttons X
                                                       3       1
    or Y

                                                                         2
                                                                    12         10
                                                       Y
                                                                     3   1
                                                 2
                                       12         10
                                   X
                                            3    1




                            RNDPOOLS                                     Ju Yeal Jeon
    Logic MEMORY
   A bi-stable double pilot
                                                           Z
    valve can be set or reset
    simply by a pulse (push                     12             10
    and release) on buttons X
                                                       3       1
    or Y

                                                                        2
                                                               12        10
                                                       Y
                                                                    3   1
                                                 2
                                       12         10
                                   X
                                            3    1




                            RNDPOOLS                                     Ju Yeal Jeon
    Logic MEMORY (latch)
   A popular memory circuit
    is the latch
                                                                      Z
   Will not re-make after                         1   3
    pneumatic power failure               Y
                                              12        10
   A pulse on X operates the                          2

    pilot / spring valve to give                             12       10
    output Z                                                      3   1
   A feedback from Z runs
    through the normally                               2
    open valve Y to latch the                 12        10
                                          X
    operation of Z when X is                       3   1
    released
   A pulse on Y breaks the
    latch and Z is exhausted


                               RNDPOOLS                                    Ju Yeal Jeon
    Logic MEMORY (latch)
   A popular memory circuit
    is the latch
                                                                            Z
   Will not re-make after                          1   3
    pneumatic power failure               Y
                                              12         10
   A pulse on X operates the                           2

    pilot / spring valve to give                                   12            10
    output Z                                                            3   1
   A feedback from Z runs
    through the normally                                2
    open valve Y to latch the                      12         10
                                          X
    operation of Z when X is                        3   1
    released
   A pulse on Y breaks the
    latch and Z is exhausted


                               RNDPOOLS                                         Ju Yeal Jeon
    Logic MEMORY (latch)
   A popular memory circuit
    is the latch
                                                                      Z
   Will not re-make after                         1   3
    pneumatic power failure               Y
                                              12        10
   A pulse on X operates the                          2

    pilot / spring valve to give                             12            10
    output Z                                                      3   1
   A feedback from Z runs
    through the normally                               2
    open valve Y to latch the                 12        10
                                          X
    operation of Z when X is                       3   1
    released
   A pulse on Y breaks the
    latch and Z is exhausted


                               RNDPOOLS                                   Ju Yeal Jeon
    Logic MEMORY (latch)
   A popular memory circuit
    is the latch
                                                                       Z
   Will not re-make after                          1   3
    pneumatic power failure               Y
                                                   12         10
   A pulse on X operates the                           2

    pilot / spring valve to give                              12       10
    output Z                                                       3   1
   A feedback from Z runs
    through the normally                                2
    open valve Y to latch the                 12         10
                                          X
    operation of Z when X is                        3   1
    released
   A pulse on Y breaks the
    latch and Z is exhausted


                               RNDPOOLS                                     Ju Yeal Jeon
    Logic MEMORY (latch)
   A popular memory circuit
    is the latch
                                                                      Z
   Will not re-make after                         1   3
    pneumatic power failure               Y
                                              12        10
   A pulse on X operates the                          2

    pilot / spring valve to give                             12       10
    output Z                                                      3   1
   A feedback from Z runs
    through the normally                               2
    open valve Y to latch the                 12        10
                                          X
    operation of Z when X is                       3   1
    released
   A pulse on Y breaks the
    latch and Z is exhausted


                               RNDPOOLS                                    Ju Yeal Jeon
Logic arrangements for fully
  balanced spool valves




             RNDPOOLS          Ju Yeal Jeon
    Logic circuits (spool valves)
   NO / NC                              5/2 OR
   Selection / Diversion                Single pulse control
   Latch                                Air conservation
   OR, AND, NOT                         Double flow
   Single pulse maker                   Counting
   Slow pressure build
   Pre-select




Click the section to advance directly to it
                               RNDPOOLS                          Ju Yeal Jeon
    3/2 NO / NC
   A fully balanced valve
    allows pressure on any
    pot or combination of                12
                                                  2
                                                   10
    ports
                                              3   1
   A single valve can be
    used normally open or
    normally closed
   For normally open the
                                                  2
    supply pressure is                   12        10
    connected to port 1                       3   1
   For normally closed the
    supply pressure is
    connected to port 3



                              RNDPOOLS                  Ju Yeal Jeon
    3/2 NO / NC
   A fully balanced valve
    allows pressure on any
    pot or combination of                12
                                              2
                                                  10
    ports
                                          3   1
   A single valve can be
    used normally open or
    normally closed
   For normally open the
                                              2
    supply pressure is                   12       10
    connected to port 1                   3   1
   For normally closed the
    supply pressure is
    connected to port 3



                              RNDPOOLS                 Ju Yeal Jeon
    3/2 Valve selection / diversion
   Selection of one of two
    supplies connected to
    ports 1 and 3 can be                  12
                                                   2
                                                    10
    different pressures
                                               3   1
   Diversion of one supply
    to one of two outlets
   If it is required to exhaust
    the downstream air a 5/2
    valve is required                          3   1

                                          12        10
                                                   2




                               RNDPOOLS                  Ju Yeal Jeon
    3/2 Valve selection / diversion
   Selection of one of two
    supplies connected to
    ports 1 and 3 can be                  12
                                               2
                                                   10
    different pressures
                                           3   1
   Diversion of one supply
    to one of two outlets
   If it is required to exhaust
    the downstream air a 5/2
    valve is required                      3   1

                                          12       10
                                               2




                               RNDPOOLS                 Ju Yeal Jeon
    Latch with controls
                                                                   Out
   In this version of a latch
    the push button valves                                12
                                                                   2
                                                                    10
    are connected to perform
    „OR‟ and „NOT‟ functions                                   3   1

   The „OFF‟ valve must be                           2
                                        ON   12        10
    placed last in the signal
    chain so that if both                         3   1
    valves are operated
    together the „OFF‟                                2
                                        OFF 12         10
    command will dominate
    over the „ON‟ command                         3   1




                             RNDPOOLS                                    Ju Yeal Jeon
    OR, AND, NOT
                                                        z   2
   A single 3/2 pilot operated          OR    12            10
    spring return valve can be
                                                    3       1
    use for any of these logic
    functions
                                         x          y
   x OR y gives output z
                                                        z   2
   x AND y gives output z               AND   12            10

   x gives NOT z                                   3       1
                                         x                  y

                                                        z   2
                                         NOT   12            10

                                                    3       1
                                         x




                              RNDPOOLS                            Ju Yeal Jeon
    Single pulse maker
   Converts a prolonged
    signal x into a single                        z
    pulse z
                                                      2
   Signal z must be removed             12            10
    to allow the valve to reset               3       1
    then x can be applied
    again
   The duration of the pulse
    can be adjusted with the
    flow regulator                            x




                              RNDPOOLS                      Ju Yeal Jeon
    Slow initial pressure build up
   Choose a 3/2 pilot spring
    valve with a relatively
                                                    2
    high operating force e.g.              12        10
    3 to 4 bar                                  3   1
   When the quick connect
    coupling is made, the
    output at port 2 is
    controlled at the rate of
    the flow regulator setting
   When the pressure is
    high enough to operate
    the valve full flow will take
    over




                                RNDPOOLS                  Ju Yeal Jeon
    Pre-select
   The lever valve can pre-
    select the movement of
    the cylinder OUT or IN                                    2
                                                     12        10
   The movement will occur
    the next time the plunger                             3   1
    valve is operated                            2
                                      12          10
   The plunger valve can be
    released immediately and                 3   1
    subsequently operated
    and released any number                      2
                                                  10
    of times                     12
                                             3   1
                                OUT/IN
                                pre-select




                            RNDPOOLS                                Ju Yeal Jeon
    5/2 OR function
   The valve at position „a‟ is
    reversed connected and
    supplied from the valve
    conventionally connected                       4    2
                                                             12
    at position „b‟                       a   14

   The cylinder can be                            5   1 3
    controlled from either
    position „a‟ „OR‟ position
                                                   4    2
    „b‟                                                      12
                                          b   14
                                                   5   1 3




                               RNDPOOLS                           Ju Yeal Jeon
    Single pulse control
   Each time the foot
    operated valve is
    pressed the cylinder
    will single stroke +                              4       2
                                                                   12
    and - alternately                            14

   First foot operation                              5   1
    the cylinder moves                       2                          2
    out                         12            10              12             10

   Second foot                        3     1                     3    1
    operation the
    cylinder moves in
   Third….. out and so
    on
                           12          2
                                        10

                                 3     1

                            RNDPOOLS                                        Ju Yeal Jeon
    Air conservation
   Power stroke in the
    instroke direction only
   Differential area of the
    piston gives an outstroke               4       2
                                                        12
    force when the pressure            14

    is balanced                             5   1

   Air used to outstroke is
    equivalent to a cylinder
    with only the same bore
    as the rod diameter
   Assumes the cylinder is
    not loaded on the plus
    stroke and low friction



                            RNDPOOLS                         Ju Yeal Jeon
    Air conservation
   Power stroke in the
    instroke direction only
   Differential area of the
    piston gives an outstroke               4       2
                                                        12
    force when the pressure            14

    is balanced                         5       1

   Air used to outstroke is
    equivalent to a cylinder
    with only the same bore
    as the rod diameter
   Assumes the cylinder is
    not loaded on the plus
    stroke and low friction



                            RNDPOOLS                     Ju Yeal Jeon
    Double flow
   Where a larger 3/2 valve
    is not available
   Two flow paths in a 5/2
    valve each with a                       4     2
    separate supply can be             14             12

    arranged to give double                 5 1   3
    flow or supply separate
    devices
   Ensure the tube size to
    the cylinder is large
    enough to take the double
    flow




                            RNDPOOLS                       Ju Yeal Jeon
    Double flow
   Where a larger 3/2 valve
    is not available
   Two flow paths in a 5/2
    valve each with a                    4    2
    separate supply can be             14         12

    arranged to give double             5 1   3
    flow or supply separate
    devices
   Ensure the tube size to
    the cylinder is large
    enough to take the double
    flow




                            RNDPOOLS                   Ju Yeal Jeon
    Counting
                                         4
   Counting applications are
    best achieved with
    electro-mechanical or
                                         3
    programmable electronic
    counters
   Pneumatic counting
    circuits use large                   2
    numbers of logic valves
    and can be slow
   The counting chain
    shown will count to 4                1

   Red and blue are non-
    overlapping alternate
    pulses, purple is the reset
    line

                              RNDPOOLS       Ju Yeal Jeon
    Counting application
                                                           a0     a1
   The counting circuit is                        A
    applied to count 4 strokes
    of a cylinder
   At rest all counting valves
    are held reset by the start
    valve
   Start outstrokes „A‟
   Alternate signals from
    „a1‟ and „a0‟ progresses
    operation of the counting
                                                   Start
    valves up the chain
   On the 4th operation of
    „a1‟ the green signal                a1   a0
    resets the start valve to
    stop the cylinder

                              RNDPOOLS                     Ju Yeal Jeon
Feedback methods




       RNDPOOLS    Ju Yeal Jeon
    Time delay
   A signal is restricted to
    slow the rate of pressure
    build up on a pressure                            Output
    switch (3/2 differential
    pressure operated valve)                                2
                                                 12             10
   When the pressure switch
    operates a strong un-                             3 1
    restricted output is given
   A reservoir provides
    capacitance to allow less           Signal
    fine and sensitive                    in
    settings on the flow
    regulator making it easy
    to adjust


                             RNDPOOLS                           Ju Yeal Jeon
    Time delay
   Manual remote start of a                                -        +              a1

    double acting cylinder                              A
    with a time delay in the
    outstroked position
    before automatic return
                                                                4    2
                                                   14                    12

                                                                5   1 3

                                                                                    2
                                                                         12              10

                                                                              3 1
                            2                       2
                   12           10        12         10

                        3       1         a1   3    1




                                    RNDPOOLS                                        Ju Yeal Jeon
    Pressure decay
   Manual remote start of a                              -        +                a1

    double acting cylinder                            A
   Uses a low pressure
    operated valve connected
    normally open
                                                              4    2
   When the back pressure                    14                       12
    in the front of the cylinder                              5   1 3
    falls below 0.1 bar the
    return signal is given
   Connection taken                          2                             2
                                     12            10               10          12
    between the cylinder and
    flow regulator                        3       1                         1   3   0.1bar
   Useful for pressing work
    pieces of variable size


                               RNDPOOLS                                             Ju Yeal Jeon
    Electro-pneumatic
   The majority of systems               Circuit building block for
    use electrical/electronic              each cylinder
    control due to the high                              a0    a1
    degree of sophistication
    and flexibility                                  A
   Solenoid valves are used
    to control cylinders
   Feedback signals are
                                                         4     2
    from reed switches,                         14              12
    sensors and electrical
                                                         5    1 3
    limit switches
   Logic is hard wired or
    programmed in to a PLC                 a0                 a1
    (programmable logic
    controller)

                                RNDPOOLS                             Ju Yeal Jeon
End




RNDPOOLS   Ju Yeal Jeon