Valves and valve actuation – Fluid actuated or retarded – Pilot or servo type motor
Patent
1995-06-07
1997-12-02
Chambers, A. Michael
Valves and valve actuation
Fluid actuated or retarded
Pilot or servo type motor
251 54, 91387, 137625, F16K 3110
Patent
active
056927240
ABSTRACT:
The invention attenuates higher frequency vibrations or oscillations which can result in wear and/or less than optimal performance of a valve positioner. The invention provides a low pass mechanical filter which can be realized, for example, in a dash pot like damper device. The damper includes a pair of diaphragms associated with a pair of chambers, which are in communication with one another by an orifice. The chambers associated with each diaphragm are filled with oil or a hydraulic fluid such that the rate of relative motion (for example between a summing beam of the positioner and the location at which a signal force is applied) is controlled by flow of oil through the orifice.
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Chambers A. Michael
Neles-Jamesbury, Inc.
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