Dual seal in-line test valve

Details Dual seal in-line test valve Dual seal in-line test valve

1983-01-10

1985-04-16

Nilson, Robert G.

Fluid handling

Systems

Multi-way valve unit

73 4R, 137458, 13762549, G01L 2700

Patent

active

045109702

ABSTRACT:
A high pressure in-line test valve (42) is positioned to block off a first fluid pressure source (10) acting on a control valve means (32 and 34) and to provide communication with an alternate test fluid pressure source (138) for testing the control valve means. The test valve (42) has a central bore (70) in which a depressible piston (78) is positioned for longitudinal movement between a seated extended position (FIG. 2) blocking the first fluid pressure source and simultaneously communicating test fluid to the control valve means, and an unseated retracted position (FIG. 3) re-establishing communication between the first fluid pressure source and the control valve means and simultaneously blocking the alternate fluid pressure source (138) with a dual sealing means. The dual sealing means includes a primary metal-to-metal sealing member (84 and 114) and a secondary annular sealing member (120) providing a test valve that is capable of withstanding high working pressures such as 20,000 pounds per square inch without leaking fluid from the first fluid pressure source ( 110) to the alternate fluid passage (104) or externally of the test valve. The dual sealing means are releasable upon engagement of a hollow stinger (124) which actuates the piston (78) into its seated position and provides a connection means (134) to supply a test fluid from an alternate fluid pressure source (138) for testing of the control valve means (32 and 34).

REFERENCES:
patent: 3049148 (1962-08-01), Richardson
patent: 3817282 (1974-06-01), Peters
patent: 3927553 (1975-12-01), Frantz
patent: 3987817 (1976-10-01), Peters

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