Dual check valve

Details Dual check valve Dual check valve

F - Mech Eng,Light,Heat,Weapons

16

K

F16K 15/00 (2006.01) E21B 34/06 (2006.01) F16K 15/03 (2006.01) F16K 15/06 (2006.01)

Patent

CA 2540499

A check valve comprising a section of a drill string, a flapper valve positioned within and concentric to the section of the drill string, and a piston valve positioned within and concentric to the section of the drill string. The flapper valve allows fluid flow in a first direction through an inner portion of a cross-section of the section of the drill string and not allowing fluid flow in a second direction, and the piston check valve allowing fluid flow in the first direction through an outer portion of the cross-section of the section of the drill string and not allowing fluid flow in the second direction, where the first portion and the second portion of the cross-section of the section of the drill string are mutually exclusive.

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