Pressure-operated valving for oil and gas well swabs

Details Pressure-operated valving for oil and gas well swabs Pressure-operated valving for oil and gas well swabs

1986-10-29

1987-12-15

Smith, Leonard E.

Pumps

Drilled well free piston-type pump

F04B 4712

Patent

active

047129816

ABSTRACT:
Apparatus and method of utilizing differential pressure to seat an almost-closed valve ball. Included are apparatus and means to protect valve ball from excessive closing force. Also included is a multiple valve arrangement to relieve excessive differential pressure.

REFERENCES:
patent: 2212416 (1940-08-01), Eddins
patent: 3176619 (1965-04-01), Shaw
patent: 4070134 (1978-01-01), Gramling

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