Abstract: A sanitary diaphragm valve is provided that includes a generally dome shaped diaphragm having a central boss that can be connected to or driven by a valve actuator. The diaphragm includes an outer peripheral edge and a relatively thin web portion that connects the boss to the outer edge. In one embodiment, the web portion is arcuate or dome shaped. The thinner web portion permits the diaphragm to have an extended cycle life and to permit the valve to operate at higher fluid pressures. The thin web may be defined by two different contoured surfaces, one convex and the other concave, such as formed by two radiuses. A valve body is provided that includes a bowl shaped valve cavity. This valve cavity includes an outer vertical edge to permit more thorough cleaning and to eliminate entrapment areas. The valve assembly provides support surfaces for the diaphragm that reduces stress on the diaphragm particularly at higher operating pressures.

Abstract: A rotary actuator for a valve includes a cam mechanism for transmitting opening force to a movable valve member to move the valve member off a valve seat, against the bias of a closing spring. The cam mechanism does not transmit spring force to the valve member when the valve member is being moved to the closed position or is in the closed position. Also, the parts of the cam mechanism have a large surface area of contact when the valve is in the open position, to minimize unit loading of the cam surfaces. The movable cam is movable axially relative to the actuator handle. The movable valve member is blocked from rotation relative to the valve body. The cam mechanism does not transmit spring force to the movable valve member when the valve member is in the closed position.

Abstract: A radial diaphragm valve includes a diaphragm having an elongated stem that is threadably or otherwise installed on an actuator piston. The elongated stem is slideably received in a bore formed in the actuator housing, and includes a circumferential recess that receives a seal. The seal provides a backup seal function separating the process fluid from the interior region of the actuator.

Abstract: A radial diaphragm valve includes a diaphragm having an elongated stem that is threadably or otherwise installed on an actuator piston. The elongated stem is slideably received in a bore formed in the actuator housing, and includes a circumferential recess that receives a seal. The seal provides a backup seal function separating the process fluid from the interior region of the actuator.