Fail safe pipe plug

Details Fail safe pipe plug Fail safe pipe plug

1990-06-11

1992-06-09

Hornsby, Harvey C.

Pipes and tubular conduits

With closures and plugs

Inflation stem type

138 93, F16L 5511

Patent

active

051198614

ABSTRACT:
Normally closed valve for controlling flow of fluid material through a straight, non-tapered conduit has resilient elastomeric seal attached to the perimeters of two axially aligned rigid end plates. Elasticity of elastomeric seal draws end plates together while radially expanding so as to engage and seal against the inner wall of conduit. Valve may be opened by axially separating the two opposing end plates using a locally actuated displacer mechanism attached to one of the end plates, causing the elastomeric seal to radially contract and the valve to open.

REFERENCES:
patent: 2288731 (1942-07-01), Newlon
patent: 2843154 (1958-07-01), Hosking
patent: 2923323 (1959-09-01), Franck
patent: 3015469 (1962-01-01), Falk
patent: 3022977 (1962-02-01), Jones
patent: 3444898 (1969-05-01), Caple
patent: 3457959 (1969-07-01), Cooper
patent: 3550636 (1970-12-01), Mearne
patent: 3946761 (1976-03-01), Thompson
patent: 4185806 (1980-02-01), Dremann
patent: 4254791 (1981-03-01), Bron
patent: 4467835 (1984-08-01), Champleboux
patent: 4483457 (1984-11-01), Schukei
patent: 4614206 (1986-09-01), Mathison

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