Boltless bonnet assembly for gate valve

Details Boltless bonnet assembly for gate valve Boltless bonnet assembly for gate valve

1989-05-03

1990-11-06

Fox, John C.

Valves and valve actuation

Mechanical movement actuator

Screw

251329, F16K 300

Patent

active

049680021

ABSTRACT:
A boltless bonnet assembly is provided for use with a valve, particularly a gate valve having a valve body comprising an upper housing, a lower fluid passageway, a gate, and a valve stem having a thrust washer. The bonnet assembly has a bonnet with a lower plate adapted to sealingly engage an underside of a lip of the upper housing, the lip defining an opening in the upper housing, and a cylindrical neck having inner and outer sets of threads at an upper portion. A bonnet clamp or alternatively a lock ring and clamp ring are provided to engage the outer threads of the bonnet to clamp the plate tightly against the underside of the lip, and a bonnet cover is provided for retaining the thrust collar of the valve stem in a recess in the bonnet, the bonnet cover being threaded into the set of inner threads of the bonnet. The bonnet cover is further provided with a seal flange and associated gasket which is compressed between the flange and an upper surface of the bonnet neck to seal the threaded connections from an outside environment.

REFERENCES:
patent: 2541968 (1951-02-01), Laurent
patent: 2582996 (1952-01-01), Laurent
patent: 3060964 (1962-10-01), Bagwell
patent: 3068901 (1962-12-01), Anderson
patent: 3497177 (1970-02-01), Hulsey
patent: 3658087 (1972-04-01), Nelson
patent: 3770247 (1973-11-01), Nelson
patent: 3938779 (1976-02-01), Benjamin
patent: 4225115 (1980-09-01), Miller
patent: 4373700 (1983-02-01), Buchta
patent: 4431163 (1984-02-01), Barbe
patent: 4436283 (1984-03-01), Shore
patent: 4699359 (1987-10-01), David
Euro-20 Product Brochure; Pont-a-Mousson, S.A., date unknown.

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