Fluid handling – Pressure modulating relays or followers – Plural series units
Patent
1984-08-24
1989-02-14
Cohan, Alan
Fluid handling
Pressure modulating relays or followers
Plural series units
137 85, G05D 1600
Patent
active
048040096
ABSTRACT:
The incremental interface system of the present invention includes a pneumatic input means for providing a first pressure to be regulated. A pressure repeater means includes a volume relay having a first chamber coupled to the intermediate bus of the input means and a second chamber coupled to a pneumatic transducer to be controlled, the first chamber and the second chamber being in fluid flow isolation one from the other. The pressure repeater means provides a second pressure at its second chamber which has a predetermined relationship to the first pressure. A reservoir means is coupled to the intermediate bus between the input means and the repeater means for limiting the rate of change of the first pressure. The input means, repeater means and reservoir means cooperate to define a substantially constant volume of fluid. In a first preferred embodiment, the reservoir means is coupled in parallel with the first chamber while in a second preferred embodiment, the reservoir means is coupled in series with the first chamber.
REFERENCES:
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Cohan Alan
Gerasimow Alexander M.
Johnson Service Company
Levine Edward L.
Shupe Larry L.
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