Gregory P Nichols

US Patent:

47828501, Nov 8, 1988

Filed:

May 26, 1987

Appl. No.:

7/054297

Inventors:

John W. Duffy - Tama IA
Gregory P. Nichols - Marshalltown IA

Assignee:

Fisher Controls International, Inc. - Clayton MO

International Classification:

F16K 31126

US Classification:

1371165

Abstract:

A diaphragm type regulator valve includes a pusher post with outwardly extending stop ears coupled to the diaphragm. The linkage coupling the pusher post and valve disc includes a lever having a pair of legs that engage a pin in a bifurcated portion of the pusher post for transmitting forces between the diaphragm and the valve disc. A retainer is rigidly mounted to the valve casing and pivotally supports the lever. The retainer includes a pair of stops that straddle the pusher post and extend in the path of travel of the stop ears thereon for positively restraining travel of the pusher post beyond a predetermined point should an excess pressure condition exist. Restraining travel of the pusher post prevents excessive stress on the linkage. A one piece plastic pressure relieve indicator mechanism is also disclosed.