Specifications

RECOGNIZING THE RELIEF VALVE
Figure 5.2
PROPER PUMP GEAR ROTATION
Proper gear rotation is shown on the warning tags attached to the relief valve faceplate.
WARNING
DO NOT REVERSE ROTATION
Reversing rotation of the pump without reversing the position of the relief valve faceplate will cause the relief valve
to be inoperable. Discharge pressure will be holding the valve closed instead of pushing it open. Running the pump
against the relief valve can cause very high pressure buildup on the discharge side of the pump and in the system
downstream of the pump. High pressure can cause the pump or any other system component to break or leak
causing liquid in the system to escape resulting in possible injury or death.
PUMP INLET and PUMP DISCHARGE
On the RV style relief valve, either the “pump inlet” or “pump discharge” arrow will always point directly to one side
port on the cases that have one side port and one top port. The top port is connected to the side of the pump that
is opposite the side port. The “pump inlet” and “pump discharge” arrows will always point directly to the inlet and
discharge ports on the pump with straight through port cases.
An integral relief valve should not be used on applications where the discharge must be closed for more than one
minute. Prolonged operation of the pump with the discharge closed will cause rapid heating of the liquid circulating
through the relief valve, thus resulting in possible damage.
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