Abstract: A pinch valve for regulating fluid flow having a close mechanism using push-pull members and an open mechanism using open follower members in order to pinch a sleeve closed and to assist in opening it. In a particular embodiment, a four-bar linkage is employed.

Abstract: A pinch valve for regulating fluid flow includes a close mechanism for closing a sleeve by pinching its sides together. The pinch valve also includes an open mechanism integral with the close mechanism for opening the tube by urging the sides apart. The open mechanism pushes against the ends of the closure in the sleeve as the tube is being opened. In one embodiment of the invention open cams push against the end of the closure, and in another embodiment open followers, which are part of a four bar linkage, push against the sides of the sleeve.

Abstract: A method of making an isolator flow device for use in a process fluid system. The device has a body and an elastomeric sensor ring in the body, through which process fluid flows. There is an annular space outside the sensor ring for communicating outside the body to sense pressure on the ring by the process fluid. In the method, the ring is formed by in-situ molding to the body, and is bonded to the body at its opposite ends, leaving an intermediate portion unbonded. Then, the elastomer will shrink annularly to create an annular space between the body and the ring.

Abstract: A pinch valve includes a housing with a quarter-turn closure mechanism disposed within the housing for adjustment of a spool-sleeve. The mechanism consists of two cam members rotatably supported in the housing on the opposite sides of the sleeve and connected to a hub via drive links. The hub is disposed proximate an opening in the housing and is rotated manually by a handle, or automatically by an actuator. Each cam member includes a first portion which is rotatable across the sleeve and a shank portion which is eccentrically disposed on the first portion and traverses the sleeve profile. As the cam members are rotated the shank portions move transversely of the sleeve longitudinal axis, toward and away from one another for pinching the sleeve and thereby selectively throttling or stopping the flow through the system.

Abstract: A pinch valve in which a sleeve is contained in a housing, the motive fluid is sealed between the sleeve and the housing interior, and the sleeve is fixed in position in the housing. Also, the process fluid can be sealed between the sleeve and the line piping.

Abstract: A pump having two collapsible pumping chambers connected in series is coupled to a pump drive mechanism which opens and closes each chamber in a sequence that produces pumping action.