V1.4 6 of 22 04/01/2009
Never align a pump and motor supplied with a pin type coupling without first removing
the pins. Never depend upon sight or feel. Use proper gauges when aligning the pump.
Never operate the pump without all guards in place.
Relief Valve Protection
All C Series models are positive displacement pumps. As the pump rotates, liquid is
positively delivered to the discharge side of the pump. If the discharge line is closed off,
pressure will increase until the drive stalls and/or fails, the pump breaks or ruptures, or
the piping bursts. To prevent this from happening, the use of a pressure relief valve is
required. A relief valve that directs the flow back to the supply tank is recommended.
The internal relief valve available on C Series pumps is designed for overpressure
protection only. It is not intended as a flow control device or for any similar use.
Continuous operation of the relief valve will result in excessive heat buildup within the
pump cavity that could cause serious internal damage. Make certain the adjusting screw
of the relief valve is located on the suction side of the pump.
Unless otherwise specified at the time of order, all C Series pumps with an internal relief
valve (except CC models) are supplied with the standard spring, with a range of 30-225
psi (10 - 200 psi in size 2 pumps), set to provide full bypass relief at 90 psi. The standard
spring in CC model pumps has a range of 0 -110 psi, set to provide full bypass relief at
100 psi.
To adjust the relief setting within the range of a given spring's capability:
• Remove the cap nut (model CC pumps only).
• With a small wrench, hold the adjusting screw steady.
• With a second wrench, loosen the locking nut by rotating counterclockwise.
• Throttle the outlet line until the differential pressure at the pump port reaches the
desired level.
• If the pressure fails to reach this level with the throttling valve closed, turn the
adjusting screw inward (clockwise) until the desired pressure is reached.
(Adjusting clockwise raises the pressure setting.)
• If the pressure reaches the desired level before the throttling valve is completely
closed, turn the adjusting screw outward (counterclockwise) until the desired
pressure is reached. (Adjusting counterclockwise lowers the pressure setting.)
• Retighten the nut to lock the setting in place.
• Replace the cap nut (model CC pumps only).
• Recheck the pressure gauge reading.
If an internal relief valve has not been supplied with the pump some other means of
protection must be utilized. These include in-line safety relief valves, pressure shutdown
switches or other similar devices.
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