BUILDING TRADES

81-RPD Differential Pressure Relief Pilot

The 81-RPD is a remote sensing, high capacity, spring and diaphragm operated, normally closed, differential pilot. The inner valve is held closed by the spring. When the pressure under the diaphragm overcomes the combined forces of the spring setting and the pressure above the diaphragm, the pilot opens. The 81-RPD valve is used for remote sensing of a differential pressure for normally closed applications.

81-RPD Differential Pressure Relief Pilot

• The pilot shall be Singer Model 81-RPD, with the spring range specified.
• The normally closed pilot shall be of brass and bronze construction with a spring to adjust the opening pressure differential.
• The pilot and 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 permanently bonded 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.
• Two separate ports (one above and one below the diaphragm), will sense a pressure differential allowing pilot and therefore the main valve to modulate subject to pressure differential, maintaining a relatively steady set-point.
• Maximum working temperature: 180° F / 82° C • Maximum working pressure: 400 psi / 27.6 bar

Download Specification Document

81-RPD Differential Pressure Relief Pilot

For more information on the 81-RPD:

Download the 81-RPD Product Guide.

Download the 81-RPD Operations Guide.

81-RPD Differential Pressure Relief Pilot

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