Wellhead shut-off valve

Details Wellhead shut-off valve Wellhead shut-off valve

1975-07-03

1976-10-26

Leppink, James A.

Wells

Above ground apparatus

With seal for reciprocating member

166226, E21B 4300

Patent

active

039878465

ABSTRACT:
An improved sucker rod pumping system for an oil well includes a valve member mounted in the rod string, a valve seat formed in the wellhead, and means for moving the rod string upwardly to cause the valve member to sealingly engage the valve seat. The valve member is located on the rod string such that during normal pumping operation, it will not contact the valve seat or otherwise interfere with the pumping operations. When it is desired to close in the well or inject a fluid therein, the rod string is elevated above its normal stroke until the valve member sealingly engages the valve seat.

REFERENCES:
patent: 1871319 (1932-08-01), Griswold et al.
patent: 2517655 (1950-08-01), Gillespie
patent: 3500907 (1970-03-01), Gentry
patent: 3817327 (1974-06-01), Grable et al.

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