Electric and pneumatic valve positioner

Details Electric and pneumatic valve positioner Electric and pneumatic valve positioner

1987-03-17

1988-11-15

Look, Edward K.

Motors: expansible chamber type

Working member position feedback to motive fluid control

Bias-type input and feedback signal means

91465, F15B 1316

Patent

active

047840390

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 motor coupled to a drive unit which compresses or extends a control spring coupled to the balance beam. When the motive power control signal is removed from the motor, the balance beam establishes an equilibrium position based on the existing position of the motor.

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Conameter Corp. Series 42 Actaire Pneumatic Positioner Data Sheet, 12/84.

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