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Operation
Grounding
The equipment must be grounded to reduce the risk
of static sparking. Static sparking can cause fumes to
ignite or explode. Install the BPR into piping that is
properly grounded. Grounding provides an escape
wire for the electric current.
Operation
NOTE: The BPR controls fluid pressure ahead of its
inlet.
Air Operated Type
Adjust the air pressure regulator (D) to the desired fluid
back pressure using the ratios below:
•
For lower flow units (25R487):
The fluid:air ratio is approximately 3:1; 83 psi (0.6
MPa, 5.7 bar) inlet air pressure = 250 psi (0.6 MPa,
17.2 bar) inlet fluid pressure.
•
For higher flow units (25R457):
The fluid:air ratio is approximately 2.5:1; 100 psi
(0.7 MPa, 7.0 bar) inlet air pressure = 250 psi (0.6
MPa, 17.2 bar) inlet fluid pressure.
Do not exceed the maximum air pressure of 100 psi (0.7
MPa, 7.0 bar).
Mechanical (spring) Type
Turn the adjusting screw clockwise to increase pressure
and counterclockwise to decrease pressure.
6
Flushing (if required)
Flush the back pressure regulator with a compatible
solvent whenever the rest of the system is being
flushed. Fully open the back pressure regulator when
flushing.
Service and Repair
Pressure Relief Procedure
Follow the Pressure Relief Procedure whenever
you see this symbol.
This equipment stays pressurized until pressure is
manually relieved. To help prevent serious injury from
pressurized fluid, such as splashing fluid and moving
parts, follow the Pressure Relief Procedure when you
stop spraying and before cleaning, checking, or
servicing the equipment.
1. Shut off the circulation system pump.
2. Adjust the BPR to full open, and open drain valves
in the circulation system to fully relieve circulation
system pressure.
For the pneumatic section of the BPR, relieve the air
pressure by reducing the regulated air pressure to
zero and disconnecting the air supply line from the
BPR.
3A7527B
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