Fluid handling – Line condition change responsive valves – Pilot or servo controlled
Patent
1994-03-03
1996-12-24
Rivell, John
Fluid handling
Line condition change responsive valves
Pilot or servo controlled
417 5, 417 20, 417 28, F16K 3112, F04B 4908
Patent
active
055865747
ABSTRACT:
Control system for maintaining selected pressure in a gas distribution system including a header and multiple takeoffs from the header including a compressor to supply gas to the header at selected pressure range, a control valve in the header upstream of the first takeoff, an actuator to operate the valve to modulate flow to the header, a pressure transducer to measure the pressure of the gas in the header between the valve and the first takeoff, a controller to receive a signal from the pressure transducer and generate a controller signal corresponding to a valve position required to maintain the flow of gas to the header to maintain the selected pressure and a position control device to receive the controller signal and an electronic position feedback signal from the actuator to indicate the position of the valve with a comparator to compare the valve position signal with the controller signal and an operator to operate the actuator to move the valve in a direction to the position where the position feedback signal corresponds to the controller signal.
REFERENCES:
patent: 4371315 (1983-02-01), Shikasho
patent: 4796651 (1989-01-01), Ginn
patent: 4816987 (1989-03-01), Brooks
patent: 5190068 (1993-03-01), Philbin
Carrithers David W.
Rivell John
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