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Installation
CAUTION
Handle the back pressure regulator with care to avoid
damaging the diaphragm.
Install the back pressure regulator (A) in the spray gun
fluid return line (B).
Connect the fluid return line to the inlet and outlet. Make
sure the flow direction agrees with the IN and OUT
markings on the regulator body.
Connect a regulated air supply line (C) to the air inlet of
the back pressure regulator. The maximum air inlet
pressure is 100 psi (0.7 MPa, 7.0 bar).
The back pressure regulator is adjustable to control the
fluid pressures in a circulating system from 25-250 psi
(.017-1.72 MPa, 1.7-17.2 bar).
Key:
A
Pneumatic Back Pressure Regulator
B
Fluid Return Line
C
Back Pressure Regulator Air Supply Line
D
Air Regulator
E
Fluid Supply Line
Fluid Flow
G
F
H
F
. 1. Typical Installation
IG
311595C
E
E
E
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 pres-
sures in the system.
Operation
The back pressure regulator controls pressure
ahead of its intake.
Adjust the air pressure regulator (D) to the desired back
pressure. The air:fluid ratio is approximately 2.5:1; 100
psi inlet air pressure = 250 psi outlet fluid pressure). Do
not exceed the maximum air pressure of 100 psi (0.7
MPa, 7.0 bar).
Flush the back pressure regulator with a compatible sol-
vent whenever the rest of the system is being flushed.
Adjust the air regulator to fully open the back pressure
regulator when flushing.
F
Fluid Pressure Regulator
G
Air Spray Gun
H
Gun Air Supply Line
J
Fluid Shutoff Valve
E
A
G
F
H
Installation
D
C
Fluid Flow
J
B
8719B
3
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