Installation; Operation - Graco B Series Instructions Manual

KEY
A Fluid Supply Line
B Air Spray Gun
C Fluid Pressure Regulator
D Air Supply Line
E Adjusting Screw
G
Fig. 1
Installing the Back Pressure Regulator
CAUTION
Handle the back pressure valve with care to avoid
damaging the diaphragm.
Install the back pressure regulator in the spray gun
return line. See Fig. 1.
NOTE: The back pressure regulator 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 regulator
for the best spraying combination and for proper
circulation of fluid.

Installation

F Back Pressure Regulator
(236770 shown)
G Fluid Return Line
H Ball Valve
B
C

Operation

A
D
H
Connect the line to the inlet and outlet. Make sure the
flow direction agrees with the IN and OUT markings on
the bottom of the regulator body.
The back pressure regulator is adjustable to control
the fluid pressures in a circulating system from 5 to
180 psi (0.3 to 12.4 bar, .03 to 1.24 MPa).
If more than one spray station is used, install the back
pressure regulator in the fluid supply line after the last
station. This will help maintain proper circulating
pressures in the system.
Flush the back pressure regulator with a compatible
solvent whenever the rest of the system or unit is
being flushed. Open the back pressure regulator
before flushing by turning the screw counterclockwise.
E
F
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