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

F - Mech Eng,Light,Heat,Weapons

04

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166/56

F04B 47/12 (2006.01) F04B 53/10 (2006.01)

Patent

CA 1289062

27645-3 ABSTRACT OF THE INVENTION 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.

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