EQUALIZING MEANS FOR WELL SAFETY VALVES

Equalizing means are provided for reducing the pressure differential across the seat of a well safety valve when opening the valve to avoid damage to the valve element and seat. A passageway communicates with a point below the valve seat to a point above the valve seat and includes an equalizing val...

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Bibliographische Detailangaben
Hauptverfasser:	DIETZ W,US, WATKINS F,US
Format:	Patent
Sprache:	eng
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:	Equalizing means are provided for reducing the pressure differential across the seat of a well safety valve when opening the valve to avoid damage to the valve element and seat. A passageway communicates with a point below the valve seat to a point above the valve seat and includes an equalizing valve which is closed when the valve is closed and opens prior to the opening of the safety valve. The pressure in the passageway downstream of the equalizing valve acting on the valve in a direction to keep the safety valve closed. A restriction in the passageway upstream of the equalizing valve dampens the speed of opening the well safety valve.