User's Manual

310537 3
Installation
8719A
Fig. 1
KEY
A Fluid Supply Line
B Air Spray Gun
C Fluid Pressure Regulator
D Air Supply Line
E Adjusting Screw
F Back Pressure Valve
G Fluid Return Line
A
B
C
D
E
F
G
CAUTION
Handle the back pressure valve with care to avoid
damaging the diaphragm.
Installing the Back Pressure Valve
Install the back pressure valve in the spray gun return
line. See Fig. 1.
Connect the line to the 1-1/4 in. npt(f) inlet and outlet.
Make sure the flow direction agrees with the IN and
OUT markings on the valve body.
The back pressure valve is adjustable to control the
fluid pressures in a circulating system from 5 to 200 psi
(0.3 to 14 bar, 0.03 to 1.4 MPa).
If more than one spray station is used, install the back
pressure valve in the fluid supply line after the last
station. This will help maintain proper circulating
pressures in the system.
Operation
NOTE: The back pressure valve controls pressure
ahead of its intake.
Turn the adjusting screw clockwise to increase pres-
sure and counterclockwise to decrease pressure.
Adjust the pump pressure and back pressure valve for
the best spraying combination and for proper circula-
tion of fluid.
Flush the back pressure valve with a compatible
solvent whenever the rest of the system or unit is
being flushed. Open the back pressure valve before
flushing by turning the screw counterclockwise.