Phillip G Cowan

US Patent:

50998714, Mar 31, 1992

Filed:

May 30, 1991

Appl. No.:

7/707697

Inventors:

Phillip L. Cowan - Kingwood TX

Assignee:

Binks Manufacturing Company - Franklin Park IL

International Classification:

F16K 1704

US Classification:

137116

Abstract:

A low friction proportional unloading valve mechanism for pressurized fluid circuits incorporating a valve housing forming primary and bypass fluid circuits. A normally closed unloading valve normally prevents the flow of incoming fluid to the bypass fluid circuit and is opened by a pressure responsive valve actuator. The valve actuator forms a pressure responsive wall and may take the form of spaced diaphragms or a deformable flexible hose that induces opening force to the unloading valve in direct proportion to the pressure in the primary fluid circuit. upon opening of the unloading valve, a check valve in the primary fluid circuit prevents back flow and thus maintains valve controlling pressure on the movable wall structure of the valve actuator.