This is a 2-way direct acting pilot valve, actuated by a pressure
responsive diaphragm, which seeks to reach equilibrium between
hydraulic and set spring forces. When used in a pressure relief/sustaining
circuit, the pilot modulates open as upstream pressure rises above
■ Differential pressure sensing
■ Pressure Sustaining valves sizes 11/2-4” (Standard model PC-30-P).
■ Differential pressure sustaining Valves sizes 11/2-4”
(Modified to differential sensing PC-30-P-D)