SECTION TSM 144.1 ISSUE B PAGE 9 OF 10
DANGER !
Before starting pump, be sure all drive
equipment guards are in place.
Failure to properly mount guards may
result in serious injury or death.
Mark the valve and head before disassembly to ensure
proper reassembly.
1. Remove the valve cap.
2. Measure and record the length of extension of the
adjusting screw. Refer to “A” on Figure 10.
3. Loosen the locknut and back out the adjusting screw
until spring pressure is released.
4. Remove the bonnet, spring guide, spring and poppet
from the valve body. Clean and inspect all parts for wear
or damage and replace as necessary.
ASSEMBLY
Reverse the procedures outlined under “Disassembly.” If
the valve is removed for repairs, be sure to replace in the
same position. The relief valve adjusting screw cap must
always point towards suction side of the pump. If the pump
rotation is reversed, remove the relief valve and turn end for
end. Refer to Figure 4, page 4.
PRESSURE ADJUSTMENT
If a new spring is installed or if the pressure setting of the
pressure relief valve is to be changed from that which the
factory has set, the following instructions must be carefully
followed.
1. Carefully remove the valve cap which covers the
adjusting screw.
Loosen the locknut which locks the adjusting screw so
the pressure setting will not change during operation of
the pump.
2. Install a pressure gauge in the discharge line for actual
adjustment operation.
3. Turn the adjusting screw in to increase the pressure and
out to decrease the pressure.
4. With discharge line closed at a point beyond pressure
gauge, the gauge will show the maximum pressure the
valve will allow while the pump is in operation.
IMPORTANT
When ordering parts for the pressure relief valve, always
give the model number and serial number of the pump
as it appears on the nameplate and the name of the part
wanted. When ordering springs, be sure to give the pressure
setting desired.
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