GTI Pressure Spray Gun Air Cap, Fluid Tip and

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GTI Pressure Spray Gun Air Cap, Fluid Tip and Powered By Docstoc
					   GTI Pressure Spray Gun
    Air Cap, Fluid Tip and
   Needle Selection Guide
SECTION 1. Suction/Pressure Air Caps
Choose the Air Cap most suited to your application and process. If in doubt consult your Distributor or ITW at Bournemouth.

                                               The DeVilbiss GTI Pressure spray Gun is a high efficiency, high production
                                               spray gun. It can be used as either a High Volume Low Pressure (HVLP)
                                               gun or a Compliant gun dependent upon the air cap type fitted. HVLP air
                                               caps are designed to be used at a maximum of 10 psi (0.7 bar) atomisation
                                               pressure (measured with a special air cap gauge) to function in accordance
                                               with Environmental Legislation. Compliant air caps may be used at higher
                                               atomisation pressures but it is recommended that a start point of 30 psi (2
                                               bar) at the handle (when the trigger is pulled) be used in an attempt to
                                               maximise Transfer Efficiency over the 65% minimum required. The gun
                                               requires the use of a pressure feed container or low pressure pump (0-200
                                               psi) to feed material to the front of the gun during use. The Aluminium
                                               Anodised finish gives Solventbased and Waterbased material compatibility
                                               with most modern finishes.




                   Part Number: GTI-407-105 Type: HVLP                                                               This Air Cap


105                Used for: Suction/Gravity/Pressure Feed
                   Pattern Size: 330mm
                   Air Consumption:
                   16 cfm @ 29 psi Handle pressure (10 psi at cap)
                                                                                                                     can be used
                                                                                                                     with all of the
                                                                                                                       GTI Fluid
                                                                                                                          Tips
                                                                                                                      Available in
                   Fluid flow: < 250 cc/min                                                                            the range
                                                Replaces earlier GTI-407-100 Air Cap

                   Part Number: GTI-407-110 Type: Compliant                                                          This Air Cap


110                Used for: Suction/Gravity/Pressure Feed
                   Pattern Size: 330mm
                   Air Consumption:
                   9 cfm @ 32 psi Handle pressure
                                                                                                                     can be used
                                                                                                                     with all of the
                                                                                                                       GTI Fluid
                                                                                                                          Tips
                                                                                                                      Available in
                   Fluid flow: < 250 cc/min                                                                            the range


                   Part Number: GTI-407-123 Type: Compliant                                                          This Air Cap


123                Used for: Pressure Feed only
                   Pattern Size: 340mm
                   Air Consumption: 16 cfm @ 43 psi Handle pressure
                   Fluid flow: 200-350 cc/min
                                                                                                                     can be used
                                                                                                                     with all of the
                                                                                                                       GTI Fluid
                                                                                                                          Tips
                                                                                                                      Available in
                                                                                                                       the range
                                                Replaces earlier GTI-407-120 Air Cap

                   Part Number: GTI-407-122 Type: Compliant                                                          This Air Cap


122                Used for: Pressure Feed only
                   Pattern Size: 340mm
                   Air Consumption: 16.2 cfm @ 43 psi Handle pressure
                   Fluid flow: 250-600 cc/min
                                                                                                                     can be used
                                                                                                                     with all of the
                                                                                                                       GTI Fluid
                                                                                                                          Tips
                                                                                                                      Available in
                                                                                                                       the range
                                                Replaces earlier GTI-407-130 Air Cap




                                                            Page 1 of 4
SECTION 2. GTI-P Hand Gun Suction /Pressure Fluid Tips and Needles
Select the appropriate sized Fluid Tip orifice from the range below. The appropriate Fluid Needle is shown alongside your tip selection.

                                                                                                     **Double Check**
                                                                                               All of the tips and needles on
              GTI-213-085                                                                       this page are used with the
              0.85 mm                                                                               105, 110, 122 & 123
                                                                                                           Air Caps


                                          GTI-449-10 Hand Gun Fluid Needle
              GTI-213-10
              1.0 mm



              GTI-213-11
              1.1 mm



                                          GTI-449-12 Hand Gun Fluid Needle                 Note:
              GTI-213-12                                                                   At the time of printing the GTI-214-
              1.2 mm                                                                       XX tips and GTI-420 needle are
                                                                                           also available as a GTI-455-XX
                                                                                           replacement tip and needle kit.


              GTI-213-13
              1.3 mm




              GTI-213-14                  GTI-449-14 Hand Gun Fluid Needle
              1.4 mm




                                                                                               Note:
              GTI-214-16                                                                       The GTI-213 tips with 1.6, 1.8,
              1.6 mm                                                                           2.0, and 2.2 mm centre holes
                                                                                               were discontinued in December
                                                                                               2000 and replaced by the Hi-
                                                                                               Flow GTI-214 range with their
              GTI-214-18                                                                       superior suction fluid flow
              1.8 mm                                                                           characteristics. GTI-213 tips will
                                                                                               only function correctly with a
                                            GTI-420 Hand Gun Fluid Needle                      GTI-413 fluid needle for Suction
                                                                                               & Gravity applications. GTI -214
              GTI-214-20                                                                       tips will only function correctly
              2.0 mm                                                                           with a GTI-420 fluid needle for
                                                                                               Suction & Gravity applications.


              GTI-214-22
              2.2 mm




                                                              Page 2 of 4
  GTI-P Pressure Spray Gun Air Cap and Fluid
            Tip Combination Chart
All air cap air flows were measured using the same electronic flow meter and set using the same pressure gauges
All fan sizes shown are approximate and measured at a target distance of 8"
The combinations shown fitted to guns below are not necessarily available as standard sellable combinations 'off the shelf'
All cells coloured red indicate that precise information was not available at time of printing

Air Cap Fluid Cap       Typ.                Air Consumption (cfm) at inlet         Air Cap       Notes       Size   Fluid Tip     Notes             Fluid Needle
No.     Feed Type       Max                   pressure (psi) shown [cap            Part No.                           Part                          Part No.
                        Fan                         pressure psi]                                                   Number
                        Size
                                                                                                             0.85   GTI-213-085 Both fluid tips
                                                                                                             1.00   GTI-213-10 use the same         GTI-449-10K
                                                                                                                                fluid needle
                                                                                                             1.10   GTI-213-11 Both fluid tips
                                                                                                             1.20   GTI-213-12 use the same         GTI-449-12K
105




                                                                                              The Air Cap                       fluid needle
                                GTI-P                                                            may be      1.30   GTI-213-13 Both fluid tips
          SGP HVLP       325   Pressure   12.0@17[6]   13.8@21[8]   15.5@24[10]   GTI-407-105  used with     1.40   GTI-213-14 use the same         GTI-449-14K
                                                                                               any of the                       fluid needle
                                                                                               following
                                                                                                fluid tips   1.60   GTI-214-16    All these fluid
                                                                                                             1.80   GTI-214-18    tips use the
                                                                                                             2.00   GTI-214-20    same fluid        GTI-420-K
                                                                                                             2.20   GTI-214-22    needle


                                                                                                             0.85   GTI-213-085 Both fluid tips
                                                                                                             1.00   GTI-213-10 use the same         GTI-449-10K
                                                                                                                                fluid needle
                                                                                                             1.10   GTI-213-11 Both fluid tips
                                                                                                             1.20   GTI-213-12 use the same         GTI-449-12K
110




                                                                                              The Air Cap                       fluid needle
                                GTI-P                                                            may be      1.30   GTI-213-13 Both fluid tips
          SGP Comp       330   Pressure   7.1@23       9.4@33       11.5@43       GTI-407-110  used with     1.40   GTI-213-14 use the same         GTI-449-14K
                                                                                               any of the                       fluid needle
                                                                                               following
                                                                                                fluid tips   1.60   GTI-214-16    All these fluid
                                                                                                             1.80   GTI-214-18    tips use the
                                                                                                             2.00   GTI-214-20    same fluid        GTI-420-K
                                                                                                             2.20   GTI-214-22    needle


                                                                                                             0.85   GTI-213-085 Both fluid tips
                                                                                                             1.00   GTI-213-10 use the same         GTI-449-10K
                                                                                                                                fluid needle
                                                                                              The Air Cap    1.10   GTI-213-11 Both fluid tips
122




                                                                                                 may be      1.20   GTI-213-12 use the same         GTI-449-12K
                                GTI-P                                                          used with                        fluid needle
            P   Comp     330   Pressure   9.8@22       16.2@43      22.3@65       GTI-407-122 any of the     1.30   GTI-213-13 Both fluid tips
                                                                                               following     1.40   GTI-213-14 use the same         GTI-449-14K
                                                                                                fluid tips                      fluid needle
                                                                                                             1.60   GTI-214-16 All these fluid
                                                                                                             1.80   GTI-214-18 tips use the         GTI-420-K
                                                                                                             2.00   GTI-214-20 same fluid
                                                                                                             2.20   GTI-214-22 needle
                                                                                                             0.85   GTI-213-085 Both fluid tips
                                                                                                             1.00   GTI-213-10 use the same         GTI-449-10K
                                                                                                                                fluid needle
                                                                                                             1.10   GTI-213-11 Both fluid tips
                                                                                              The Air Cap           GTI-213-12 use the same         GTI-449-12K
123




                                                                                                             1.20
                                                                                                 may be                         fluid needle
                                GTI-P                                                          used with     1.30   GTI-213-13 Both fluid tips
            P   Comp     330   Pressure   10.6@22      16.0@43      21.8@65       GTI-407-123 any of the
                                                                                               following     1.40   GTI-213-14 use the same         GTI-449-14K
                                                                                                                                fluid needle
                                                                                                fluid tips
                                                                                                             1.60   GTI-214-16 All these fluid
                                                                                                             1.80   GTI-214-18 tips use the         GTI-420-K
                                                                                                             2.00   GTI-214-20 same fluid
                                                                                                                                needle
                                                                                                             2.20   GTI-214-22




                                                                        Page 3 of 4
                   Hints and Tips on selecting and using Air caps and Fluid Tips
There is no 100% certain, positively correct way of selecting the correct Air Cap and Fluid Tip set-up for a new
material. The only true ways to find out are a lot of previous experience and to spray actually it under similar
conditions to which it will finally be used. However, there are several Rules of Thumb that we use:

          How thick is the material?
          High viscosity = big hole, Low viscosity = small hole.
          The average paint viscosity will use a fluid tip between 1.0mm to 1.4mm
          Suction feed guns will typically use one or two sizes bigger fluid tip than a Gravity gun spraying
          the same fluid due to the Force of Gravity opposing the flow of fluid to the fluid tip orifice.
          However, Pressure guns will normally use a fluid tip several sizes smaller than either of these
          gun types due to the large amount of 'push' available from its pressure feed tank or pump.
          How much do you want to come out/How fast do you want to move your arm?
          High flow = big hole, Low flow = small hole
          The average pressure sprayer will need a fluid tip between 1.0 to 1.4mm
          Remember - the primary fluid control on a pressure feed fluid supply is by adjustment of the
          tank/pump output pressure. Secondary control is the fluid tip size. Fluid needle adjustment is the
          last method of control and should only be used to make final, fine, adjustments.
          What type of Air Cap should I use - HVLP or Compliant?
          Compliant will give slightly finer atomisation than HVLP
          HVLP will use higher volumes of air to do its job than Compliant
          Compliant can handle higher fluid flow rates than HVLP
          HVLP will give slightly higher Transfer Efficiency than Compliant
          Compliant can handle higher viscosity fluids than HVLP
          HVLP will have a greater Drying Effect on the droplets than Compliant
          But be careful, its very easy to feed too much fluid to the front of the gun when using a Pressure
          Feed Tank or Pump unless you set it up carefully.

          What air pressure should I use?
          The minimum pressure necessary to give adequate atomisation to do the job
          Every job and paint type requires a different air pressure - you can only find this out by trying it,
          but remember that HVLP is officially limited to a maximum of 10psi air cap pressure. Compliant
          is more flexible, but don’t overdo it or you still wont be any more efficient than an ordinary spray
          gun. We recommend a start handle input pressure of 30psi when the trigger is pulled, then
          gradually increase or decrease as needed until the necessary result is achieved. Remember, a
          pressure feed system gives you total, and independent, control over your atomisation air and
          fluid flow. However, you must set the quantities up correctly if you are to achieve the best results.




                                                   ITW Finishing UK
                                               Technical Training School
                                                    Ringwood Road
                                                Bournemouth England
                                                       BH11 9LH
                                                Tel:     01202 571111




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