Pig trap closure

Details Pig trap closure Pig trap closure

1978-05-30

1980-12-09

Yasich, Daniel M.

Pipes and tubular conduits

With closures and plugs

Test plugs

73 495, 285409, F16L 5510, G01M 300

Patent

active

042379369

ABSTRACT:
A pig trap closure is disclosed which includes a collar adapted to be attached to the end of a pipe, a door for opening and closing the end of the pipe, means for clamping the door to the collar and sealing means for preventing communication between the interior of the pipe and the atmosphere when the door is clamped to the collar. A testing valve is provided for indicating the presence of pressurized fluid in the pipe and means connects the testing valve to a handle used to unclamp the door for preventing movement of the handle until after the presence of pressurized fluid within the pipe has been checked by the testing valve.

REFERENCES:
patent: 1200266 (1916-10-01), Strausser
patent: 1588392 (1926-06-01), Comp
patent: 2246885 (1941-06-01), Jones
patent: 2462575 (1949-02-01), Walker
patent: 3070129 (1962-12-01), Poulallion et al.
patent: 3548881 (1970-12-01), Pavan
patent: 3672403 (1972-06-01), Wilson et al.

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