Patent ID: 7581712

Claim:
A valve comprising a body having a valve seat formed therein, a bonnet, and a diaphragm abutting against and moving away from said valve seat, said body and said bonnet clamping and holding a peripheral edge of said diaphragm so as to seal the fluid inside said body, said valve characterized in that said valve further comprises an elastic member, said body is formed with an annular groove, said groove extending around said valve seat and defined by an inner side surface, an outer side surface and a bottom surface, said diaphragm is provided at the peripheral edge thereof with an annular engagement part, which is formed to be bent down from the peripheral edge thereof and have an approximate L-shape in cross-section so as to extend along the inner side surface and bottom surface of said annular groove, and said annular engagement part is fitted into said annular groove and pressed against the inner side surface and bottom surface of said annular groove in a tight state by said elastic member disposed in said annular groove and between said bonnet and said annular engagement part of said diaphragm.