Control of two stage valves

Details Control of two stage valves Control of two stage valves

1993-09-17

1995-09-26

Michalsky, Gerald A.

Fluid handling

Processes

13762564, 251 3001, F15B 13043

Patent

active

054527350

ABSTRACT:
A method and apparatus for controlling a two-stage valve using a closed-loop control system, the system including a variable gain element, the method involving continually performing the steps of estimating the flow gain of the pilot stage of the valve; comparing the estimated flow gain with a reference flow gain; and in response to said comparison step, adjusting the gain of the variable gain element to maintain a substantially constant closed-loop gain.

REFERENCES:
patent: 4907615 (1990-03-01), Meyer et al.
patent: 4938118 (1990-07-01), Wolfges et al.
patent: 4960365 (1990-10-01), Horiuchi

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