Pneumatic amplifier with negative feedback for current to pressu

Details Pneumatic amplifier with negative feedback for current to pressu Pneumatic amplifier with negative feedback for current to pressu

1985-09-25

1987-03-31

Cohan, Alan

Fluid handling

Pressure modulating relays or followers

With counter-balancing pressure feedback to the modulating...

G05D 1600

Patent

active

046535233

ABSTRACT:
A fluid amplifier is used in a pneumatic transducer to provide a control output pressure in response to a pilot pressure provided as a function of a current signal. The fluid amplifier includes a valve that opens a pressure source to the control port and also controls pressure feeding through an exhaust passageway. The amplifier valve is provided with a negative feedback arrangement as the exhaust back pressure increases to stabilize the operation and make the amplifier less sensitive. The pneumatic amplifier is provided with a diaphragm arrangement that results in increasing exhaust back pressures tending to close the exhaust valve, rather than open the exhaust valve. The negative feedback makes the valve more easily controlled and provides for more stable operation.

REFERENCES:
patent: 3003475 (1961-10-01), Rouvalis
patent: 3165262 (1965-01-01), Ollivier

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