Motors: expansible chamber type – Working member position feedback to motive fluid control – Bias-type input and feedback signal means
Patent
1991-04-02
1993-01-19
Look, Edward K.
Motors: expansible chamber type
Working member position feedback to motive fluid control
Bias-type input and feedback signal means
91465, 92 15, 92 23, F15B 1316
Patent
active
051798875
ABSTRACT:
A control force input system for a balance beam pneumatic valve positioner which does not allow the controlled apparatus to make a full travel motion when the overall control signal is removed. The control force is transmitted to the balance beam or other force summing bar using a linear solenoid coupled to a control spring coupled to the balance beam. When the motive power control signal is removed from the linear solenoid, the balance beam establishes an equilibrium position based on the existing position of the linear solenoid. The solenoid shaft extends into a captive cylinder. A piston connected to the solenoid shaft is located in the captive cylinder and forms two chambers in the cylinder. A solenoid valve connects a port in each chamber. When the solenoid valve is activated, the piston is free to travel. When the solenoid valve is deactivated, as when the control signal is removed, the piston is held in position, locking the solenoid shaft in position. A variation for use with a current to pressure transducer is detailed.
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Leinen Chris M.
Schendel Robert E.
Look Edward K.
Nguyen Hoang
Topworks, Inc.
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