Motors: expansible chamber type – Working member position feedback to motive fluid control – Bias-type input and feedback signal means
Patent
1993-03-02
1994-09-13
Look, Edward K.
Motors: expansible chamber type
Working member position feedback to motive fluid control
Bias-type input and feedback signal means
91387, F15B 1316
Patent
active
053458567
ABSTRACT:
A valve positioner has a pneumatic transducer responsive to a signal pressure for displacing a spool valve away from a neutral position to effect actuation of an actuator output shaft and further includes a gain adjustment apparatus. The pneumatic transducer includes a balance beam being operably connected at one end to the spool valve and at the other end to a hinge spring. A clamp mechanism is attached to the hinge spring and is slidably adjustable along the length of the hinge spring to vary the spring characteristics. The hinge spring tapers in thickness such that the spring increases in thickness in a direction from a first end of the spring towards the balance beam. A window or cut-out is also provided in the hinge spring to further assist in varying the spring characteristics as the clamp mechanism is moved along the hinge spring, and provide a wide range of gain adjustment over the single spring.
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Brochure, "Positioners Pneumatic & Electro-Pneumatic", Accord Controls, Inc., 11444 Deerfield Road, Cincinnati, Ohio 45242, 12 pages Jan. 1992.
Automax, Inc.
Look Edward K.
Nguyen Hoang
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