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 TM 55-1905-219-14-8
4-7.3A. DISCHARGE VALVE - MAINTENANCE INSTRUCTIONS.
a. The water discharge valve is a ball type water outlet valve which is located in the discharge opening of
the pump housing. The discharge valve consists of a ball with a hole through it. Pressing against the ball is a
plastic sleeve, which helps channel water from the ball to the discharge line, when the ball is in the open
position. When the ball is in the closed position, turned 90 degrees, the plastic sleeve presses against the ball
sealing the discharge passage against the entry of air and preventing discharge of water.
b. The water discharge valve should always be closed when starting the pump to prevent air from entering
the pump housing during priming and to permit pump pressure to build up properly. This ensures that the fire
pump is completely primed. When water is discharged from the priming pump the water discharge valve
should be opened slowly and water will be available in the discharge line. At this time the priming button can
be released. The water discharge valve is used to regulate the flow through the pump and also the pressure at
the pump. With the engine running at full throttle it may be necessary to close the valve slightly to restrict the
flow to 250 gpm (946.3 lpm) and maintain the pressure at 100 psi (689.5 kPa). The engine controls will not
automatically regulate the flow and pressure.
c. The discharge hose (not supplied with pump) is screwed onto the discharge valve and the suction hose
to the intake side of the pump housing.
This task covers:
a. Removal
b. Cleaning
c. Inspection
d. Installation
INITIAL SETUP
Test Equipment
References
NONE
NONE
Equipment
Special Tools
Condition Condition Description
NONE
NONE
Material/Parts
Special Environmental Conditions
Silicone compound
NONE
MIL-S-8660
Sulphamic acid PS-120
Personnel Required
General Safety Instructions
1
Observe WARNING in procedure.
4-310
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