Process for controlling the flow of a gas in a valve and flow ge

Details Process for controlling the flow of a gas in a valve and flow ge Process for controlling the flow of a gas in a valve and flow ge

1987-12-11

1989-03-14

Cohan, Alan

Fluid handling

Line condition change responsive valves

Pilot or servo controlled

1374875, 13762411, G05D 706

Patent

active

048117552

ABSTRACT:
The valve comprises a movable closure member and a seat in which the closure member is displaced relative to the seat for varying the gas flow through the valve. According to the invention, the process comprises causing the displacement of the movable closure member by means of a step-by-step motor as a function of the variation of the flow produced by each step according to the geometry of the valve, the type of flow employed and the pressure of the gas on the upstream and/or downstream side of the valve, and then producing a corresponding control signal for displacing in the desired direction the motor through the number of steps corresponding to the calculated flow, the displacement of the motor causing the correlative displacement of the movable closure member.

REFERENCES:
patent: 3524344 (1970-08-01), Converse
patent: 3834473 (1974-10-01), Girard et al.
patent: 4192348 (1980-03-01), Hansen
Patents Abstracts of Japan, vol. 9, No. 70, (M-367) (1793), March 30, 1985.

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