Patent ID: 8776831

Claim:
A check valve comprising: a valve body having passage holes; and a valve diaphragm including an umbrella closure member, the closure member, in a closed position, abutting against a housing body so that the closure member prevents passage of a medium through the passage holes, the closure member, in an open position, lifting off the housing body to allow the medium to pass through the passage holes, the umbrella closure member including an angled portion extending away from the valve body radially outward to contact the housing body in the closed position, the valve body including at least one clamping projection having a clamping face for contacting the angled portion of the closure member and holding the angled portion of the closure member against the housing body in the open position such that the angled portion of closure member is fixed at at least one point between the valve body and the housing body and the angled portion of closure member lifts only partially off the housing body in the open position.