While the function of a relief valve is simple enough, valve chatter (instability) and failure to positively reseat can cause the shutdown of the critical equipment. The function of a relief valve as a protection device is to limit pump discharge pressure and horsepower to a specified value without generating any valve instabilities. Since positive displacement pumps are not self-limiting, i.e., they can produce increasing pressure if sufficient driver power is available, hence a device to limit pump pressure and horsepower is required. Forsthoffer, in Forsthoffer's Best Practice Handbook for Rotating Machinery, 2011 Relief valves for positive displacement pumps ![]() Lube, Seal and Control Oil System Best Practices
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