OUTLET PRESSURE LIMITING VALVE

A main water supply safety valve to provide a maximum pressure to a water conditioning apparatus while preventing any shock load of water hammer from passing into the apparatus while still providing a single or dual check valve. When pressure acting on outlet side (306) of stepped piston (311) excee...

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Bibliographische Detailangaben
Hauptverfasser:	MORRISON, JEAN, MORRISON, WALTER, GEORGE, ESPLIN, TREVOR, THOMAS, ESPLIN, PATRICIA, ANNE
Format:	Patent
Sprache:	eng ; fre ; ger
Schlagworte:	ACTUATING-FLOATS BLASTING COCKS CONTROLLING DEVICES FOR VENTING OR AERATING ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS HEATING LIGHTING MECHANICAL ENGINEERING PHYSICS REGULATING SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES TAPS THERMAL INSULATION IN GENERAL VALVES WEAPONS
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Beschreibung
Zusammenfassung:	A main water supply safety valve to provide a maximum pressure to a water conditioning apparatus while preventing any shock load of water hammer from passing into the apparatus while still providing a single or dual check valve. When pressure acting on outlet side (306) of stepped piston (311) exceeds the force of spring (337) and pressure acting on the inlet side (304) of piston (311), the piston moves to shut off flow. The valve also has check valves (338 and 334) and a stepped ring (325) which moves to expose ring (330) to indicate that seals (312 and 313) have leaked or failed. In a different embodiment, the piston (311) has an internal seat (207) at the outlet end of piston bore (317) and a stepped shaft (203) in piston bore (317) biased towards the valve inlet (304). The step shoulder of shaft (203) seals against internal seat (207) when the piston (311) moves towards inlet (304) and a protruding portion of shaft (203) abuts against a stop.