Check valve sub

Details Check valve sub Check valve sub

1989-06-09

1991-06-04

Dang, Hoang C.

Boring or penetrating the earth

With above-ground means for handling drilling fluid or cutting

With tool shaft having plural passages for drilling fluid

137515, 175318, 175320, 175324, 2851331, E21B 1718, E21B 2110, E21B 2112

Patent

active

050206117

ABSTRACT:
A check valve sub assembly for series connection in a dual pipe string that extends downhole in a borehole for permitting flow of fluid in one direction through the annular passageway of the dual pipe string and preventing flow of fluid in the other direction. The check valve sub assembly includes an inner tube and an outer annular member for connection into series relationship respective to the inner and outer dual pipe so that fluid flow through the inner pipe is conducted through said inner tube and is maintained separate from the annulus. A check valve having an elastomeric sealing member in the form of a frustum of a cone and an axial passageway formed therethrough sealingly engages the outer circumferential wall surface of said inner tube; whereby fluid flow through the annulus in one direction forces the small diameter end of the elastomer into sealed engagement respective to the inner tubing while fluid flow in the opposite direction forces said elastomer away from said inner tube to permit the flow of fluid therebetween.

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patent: 4385668 (1983-05-01), Becker et al.
patent: 4618172 (1986-10-01), Becker
patent: 4682661 (1987-07-01), Hughes et al.

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