American Cast Iron Pipe Company

Roland L Larkin

Jerry Thomas Mann

Henry B Gibson

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.

Growing community of inventors

Gardendale, AL, United States of America

Roland L Larkin