Pneumatic valve positioner with adjustable gain

Details Pneumatic valve positioner with adjustable gain Pneumatic valve positioner with adjustable gain

1997-08-14

1999-11-02

Michalsky, Gerald A.

Motors: expansible chamber type

Working member position feedback to motive fluid control

Bias-type input and feedback signal means

91387, 137 85, F15B 908

Patent

active

059749458

ABSTRACT:
A feedback control system (i.e., a positioner) for precise positioning of a pneumatic actuator by adjusting the flow of air to the pneumatic actuator comprises an adjustable gain mechanism for adjusting the sensitivity of the positioner. The adjustable gain mechanism is coupled between a feedback input device of the positioner and a valve control device and is employed to adjust the amount of air supplied to the pneumatic actuator for a given displacement of the feedback input device. Preferably the adjustable gain mechanism is adjustable through a range of settings between a high gain setting and a low gain setting, the high gain setting allowing a greater range of motion of the valve control device than the low gain setting for a given displacement of the feedback input device.

REFERENCES:
patent: 3915062 (1975-10-01), Westfall et al.
patent: 5251148 (1993-10-01), Haines et al.
Valtek brochure, "System 80 Pneumatic Positioner", 1993.
Valtek brochure, "Summary of Operations", 1993.

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