The 81-RP is a remote sensing, high capacity, spring and diaphragm operated, normally closed pilot. The inner valve is held closed by the spring. When the sensed pressure increases above the spring setting, the pilot opens. Model 81-RP pilot is used as the standard pressure relief/sustaining pilot on all 106 and 206 series valves.
81-RP Pressure Relief Pilot
The pilot shall be Singer Model 81-RP, with the spring range specified.
The normally closed pilot shall be of brass and bronze construction with a spring to adjust the opening pressure.
The inner valve shall be of stainless steel 316 construction and the inner valve shall have EPDM resilient compound for seating. The EPDM compound must be bonded permanently to the inner valve and be ground flat and square to assure maximum performance.
The pilot shall be self-cleaning by locating the inlet directly into the seat area through the bottom of the pilot and the outlet ninety degrees to the inlet.
A separate port will sense pressure either upstream or downstream (subject to application) to open the pilot and therefore the main valve when system pressure exceeds the pilot set-point.
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