Patent ID: 7571892

Claim:
A valve assembly, comprising: a valve body, said valve body including an internal cavity, an orifice in communication with the internal cavity for communicating with a process in a tank or conduit and an outlet through which process material entering the internal cavity through the orifice can be drained from the internal cavity; a valve actuator body including an actuating shaft, said actuating shaft including a sealing tip and being mounted for movement in the valve actuator body to seal and unseal the orifice; and a diaphragm, said diaphragm being mounted to the sealing tip and including a base that seals with a bottom wall of the valve body, wherein the bottom of the valve body has an aperture that receives the actuating shaft therethrough, said diaphragm being mountable to and removable from the bottom wall of the valve body through the aperture, and wherein a bottom of the internal cavity is sloped upwardly from a side of the internal cavity where the outlet is located to a side of the internal cavity opposite the outlet, and the base of the diaphragm forms a generally elliptical seal with the sloped bottom of the valve body.