Diaphragm and diaphragm valve including the diaphragm

Abstract

This invention provides a diaphragm capable of reducing the overall height of a diaphragm valve. The diaphragm 15 includes: a valve body portion 51 having a valve seat abutment surface 51a that contacts / separates from a valve seat 21; an annular membrane portion 53 extending outward from the outer periphery of the valve body portion 51 and deformable in the direction of the moving axis; and an annular outer peripheral portion 55, the valve body portion 51 being supported by the membrane portion 53 so that it can move relative to the outer peripheral portion 55 in the direction of the moving axis. The membrane portion 53 is connected to the outer peripheral portion 55 via an annular bridging portion 59. The annular bridging portion 59 extends from the outer peripheral portion 55 in the direction of the moving axis toward the valve seat abutment surface 51a away from the valve body portion 51 and has higher rigidity than the membrane portion 53.

Images