G - Physics – 05 – D
Patent
G - Physics
05
D
170/63.1
G05D 16/00 (2006.01) G05D 16/16 (2006.01)
Patent
CA 1262867
ABSTRACT OF THE DISCLOSURE 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 exhuast 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 exhuast valve. The negative feedback makes the valve more easily controlled and provides for more stable operation.
518831
Marks & Clerk
Rosemount Inc.
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