Fluid handling – Pressure modulating relays or followers – With counter-balancing pressure feedback to the modulating...
Patent
1976-02-18
1978-04-11
Cohan, Alan
Fluid handling
Pressure modulating relays or followers
With counter-balancing pressure feedback to the modulating...
137489, F16K 31365
Patent
active
040833755
ABSTRACT:
A pilot regulator for pressure regulation servo-control of a valve in a compressible fluid system includes a delay arrangement for achieving both rapid response and stable operation. The regulator includes a restrictor for supplying fluid from the main valve inlet to a control chamber, and a pilot valve for exhausting fluid from the control chamber. A diaphragm assembly for operating the pilot valve is biased in one direction by a reference force or pressure and in the opposite direction by the static pressure to be regulated. The control chamber and a delay chamber, in adjustable restricted communication with the control chamber, bias the diaphragm assembly in opposite directions. When static pressure change causes movement of the diaphragm assembly and opening or closing of the pilot valve, the difference in control pressure with respect to delay pressure permits limited abrupt movement of the diaphragm assembly, and provides a gradual continued reset movement.
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Pamphlet - Singer, American Meter Division, "Instructions for the American Axial Flow Valve", May 1973.
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