Pilot-Operated Relief Valves

Mechanical Science Volume 2 of 2
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TYPES OF VALVES DOE-HDBK-1018/2-93 Valves Figure 29 Safety Valve Pilot-Operated Relief Valves Pilot-operated relief valves are designed to maintain pressure through the use of a small passage to the top of a piston that is connected to the stem such that system pressure closes the main relief valve. When the small pilot valve opens, pressure is relieved from the piston, and system pressure under the disk opens the main relief valve. Such pilot valves are typically solenoid- operated, with the energizing signal originating from pressure measuring systems. ME-04 Rev.0 Page 42

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