Mechanically operated hydraulic valve actuator

A wellhead assembly (10, 40) includes a valve with a valve actuator (70). The valve actuator (70) linearly moves a valve stem (84) and valve member (85) assembly to selectively open and close the valve. The valve actuator (70) moves the valve stem (84) by reciprocatingly moving a piston (76) that is...

Ausführliche Beschreibung

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Bibliographische Detailangaben
1. Verfasser:	Jennings, Charles E
Format:	Patent
Sprache:	eng ; fre ; ger
Schlagworte:	ACTUATING-FLOATS BLASTING COCKS DEVICES FOR VENTING OR AERATING EARTH DRILLING EARTH DRILLING, e.g. DEEP DRILLING ENGINEERING ELEMENTS AND UNITS FIXED CONSTRUCTIONS GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS HEATING LIGHTING MECHANICAL ENGINEERING MINING OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR ASLURRY OF MINERALS FROM WELLS TAPS THERMAL INSULATION IN GENERAL VALVES WEAPONS
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Beschreibung
Zusammenfassung:	A wellhead assembly (10, 40) includes a valve with a valve actuator (70). The valve actuator (70) linearly moves a valve stem (84) and valve member (85) assembly to selectively open and close the valve. The valve actuator (70) moves the valve stem (84) by reciprocatingly moving a piston (76) that is attached to the valve stem (84). The piston (76) is moved by applying pressurized hydraulic fluid to a piston (76) surface. Piston direction is controlled by a selector valve (142) that selectively diverts a hydraulic flow to either side of the piston (76). The valve actuator (70) further includes a piston assembly (106) for pressurizing a hydraulic flow, where the piston assembly (106) reciprocates in response to engagement by a profiled rotating cam member (91).