Abstract: Apparatus for displacing a piston in a chamber comprising a support member, a motor including a housing and a driving member that rotates relative to the housing and a driving axis, the driving member being rotatably mounted with respect to the support member, a torque resistor between the motor housing and the support limiting relative rotation between the two except when the torque between the two exceeds a predetermined amount, a piston driver including a driven portion threadedly connected to the driving member and a displacement portion that is axially displaced in response to relative rotation between the driving member and the driven portion, and a housing rotation detector to detect when the housing rotates relative to the support, indicating resistance to axial movement of the piston driver.

Abstract: A pinch valve employing first and second linear solenoids in series so that the first solenoid closes a flexible tube when powered, and the second solenoid is positioned to be pushed by a spring, to in-turn push the driving member of the first solenoid in a loss-of-power condition, and is positioned to be moved away from the first solenoid when powered so that the first solenoid is free to selectively close or open the tube.

Abstract: A fluid flow regulating device comprising a housing defining an inlet, an outlet orifice, and a fluid flow passage therein between the inlet and the outlet orifice, a movable piston in the housing having an upstream surface and a downstream surface exposed to fluid flowing through the passage, means for providing a drop in pressure between the upstream surface and the downstream surface as a function of fluid flow rate through the device, and a closure member that is connected to the movable piston and has an externally curved surface that is movable between positions adjacent to and in front of the outlet orifice as the piston moves in response to changes in the magnitude of the drop in pressure.

Abstract: A peristaltic pump comprising a base, a rotor rotatably mounted about a rotor axis and carrying rollers that travel in a circular path, a race with an internal surface for supporting a flexible tube being squeezed by the rollers traveling in the circular path, the race being pivotally mounted on the base to move between an operating position (adjacent to and concentric with the circular path) and a tube loading position (spaced from the circular path), and means to lock the race in the operating position.

Abstract: Testing apparatus including a fixed shaft and a floating shaft with means for moving it selectively generally parallel to the fixed shaft, two pulleys on each shaft paired and aligned between shafts and wherein one of the pulleys is the selectively variable diameter type.