26
Installation and Operation Manual
SystemsSystems
2001 and 2002
PRESSURE RELIEF VALVE
ADJUSTMENT
The pressure relief valve is factory tested and
preset at 400 psi [28 BAR] (600 psi [41 BAR] for
model 2000HP). During normal installation and
operation, the relief valve will not require
adjustment. The following procedures are
provided if adjustment is necessary in field
installation. DO NOT set the relief valve above
400 psi [28 BAR].
Perform this adjustment after the foam pump
has been primed.
1. Determine the maximum pressure that will
be needed to discharge foam solution. (For
example: The maximum foam injection
pressure should be approximately 50 psi
[3.5 BAR] higher than the maximum
operating pressure as set forth by
department policy.)
2. Gather the items required for reading
concentrate injection pressure: a 0-500 psi
[0 to 34.5 BAR] test quality gauge, 500 psi
[34.5 BAR] hoses and fittings to connect to
the injector line from the foam pump.
3. Disconnect the injector from the foam line
and connect the pressure gauge to it.
4. Screw the Pressure Adjustment Nut on top
of the valve all of the way down until it stops.
5. Unscrew the Pressure Adjustment Nut
counterclockwise 10 full turns. This will place
it in a position to relieve at low pressure.
CAUTION: DO NOT run the FoamPro 2001
or 2002 system more than one minute dead
headed against the pressure gauge because
the foam pump will overheat.
6. Operate the foam pump as described in the
Foam Pump Priming Check Section.
7. While the foam pump is running, slowly
screw the Pressure Adjustment Nut down
clockwise until the desired pressure is
reached. Apply tamper proof type sealant to
pressure relief valve adjustment nut so that it
does not move accidentally.
8. Stop the foam pump.
WARNING: Slowly loosen the foam pressure
line fittings and allow the pressure to escape.
Protect your face and eyes from any
potential spray which may occur.
9. Reconnect the foam line to the injector
fitting. The pressure relief valve is now set.
To Next Page
Loading...