Williams 111527 WM147C Normally Closed Relay Valve

The WM147C is a normally closed 3-way non-compensating relay valve, equipped with a WM111B breather. Pilot control pressure is used to open the normally closed valve. When sufficient control pressure is applied (15-30 PSI, 103-207 kPa), an internal diaphragm expands and unseats the proppet. Air flows from the supply port to the outlet port. The valve will exhaust pressure, when the control pressure drops below the required level, at the outlet through the exhaust breather.

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