Valves.

摘要

A diaphragm valve (1) comprises a body (2) and a bonnet assembly (12 interconnected by screw threads (9, 10). The handwheel (17) is coupled to the bonnet member (11) by screw threads (20, 21) to convert rotation of the handwheel into axial movement which is transmitted to the diaphragm compressor (16) by a pin (18). If the valve is fully open and excessive torque is applied to the handwheel in the opening direction the pin (18) moves slightly out of its bore (19) to permit disengagement of the threads (20, 21).