API-RP-576
API ICP Self Study Notes API ICP Self Study Notes
F top = Area top x P F bottom = Area bottom x P Fion Zhnag/ Charlie Chong
4.8 Pilot-operated Pressure-relief Valve 4.8.1 General A pilot-operated safety-relief valve is a pressure-relief valve in which the major relieving device or main valve is combined with and controlled by a self-actuated auxiliary pressure-relief valve (pilot). Depending on the design, the pilot valve (control unit) and the main valve may be mounted on either the same connection or separately. The pilot is a spring-loaded valve that operates when its inlet static pressure exceeds its set pressure. This causes the main valve to open and close according to the pressure. Process pressure is either vented off by the pilot valve to open the main valve or applied to the top of the unbalanced piston, diaphragm, or bellows of the main valve to close it. Figure 7 illustrates a low-pressure diaphragm-type pilot-operated valve. Figure 8 and Figure 9 show a high-pressure pilotoperated valve that uses an unbalanced piston with an integrally-mounted pilot. Figure 9 also illustrates optional remote pressure sensing from the vessel and optional dual outlets to equalize thrust. Fion Zhnag/ Charlie Chong
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F top = Area top x P<br />
F bottom = Area bottom x P<br />
Fion Zhnag/ Charlie Chong
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