Patent ID: 7255324

Claim:
A quarter-turn valve comprising: a valve body having an inlet, an outlet and a weir there between; a diaphragm arranged in said valve body for movement between a closed and opened position whereby said diaphragm cooperates with said weir for closing and opening said outlet; an input shaft for receiving a torsional input load in a closing direction and a torsional input load in an opposite opening direction; and a cam mounted on said input shaft for rotation therewith and a compressor fixed to said diaphragm, said cam comprising a plate formed with an arcuate surface having a length of about 90°, a bushing carried by said compressor and cooperating with said arcuate surface for transforming said input loads to linear output loads that flex said diaphragm between its closed and opened positions said cam having an arcuate slot formed in said plate; and wherein said bushing is slidably positioned in said slot, and is rotatably mounted to said compressor.