Fluke Corporation

Thomas Lohkamp

Robert B Haines

Pierre Delajoud

Richard A Rosenthal

A control valve has a piezoelectric actuator substantially immersed in a fluid and a sealing mechanism configured to be in a closed position and an open position. The piezoelectric actuator is configured to distort in response to an applied voltage causing the sealing mechanism to transition between the closed position and the open position. In the open position, the sealing mechanism allows fluid to flow therethrough. In response to removing the applied voltage, the piezoelectric actuator returns to an undistorted position causing the sealing mechanism to close and prevent fluid from flowing therethrough. In at least one embodiment, the piezoelectric actuator is configured to contract due to the fluid pressure, and the tube is configured to contract due to the fluid pressure to compensate at least in part for the contraction of the piezoeletric actuator.

Piezoelectric proportional control valve

Embodiments of the present invention are directed toward pressure controllers and calibrators for setting or measuring pressures in test devices. In one embodiment, the pressure controller contains a dual reference pressure controller. The dual reference pressure controller is operable to maintain two different pressures relative to a reference pressure. The first pressure being a relatively fixed amount greater than the reference pressure and the second pressure being a relatively fixed amount less than the reference pressure.

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Phoenix, AZ, United States of America

Thomas Lohkamp