Fluid handling – Pressure modulating relays or followers – With counter-balancing pressure feedback to the modulating...
Patent
1980-01-16
1981-08-25
Cohan, Alan
Fluid handling
Pressure modulating relays or followers
With counter-balancing pressure feedback to the modulating...
137 84, G05D 1600, F16K 31365
Patent
active
042853575
ABSTRACT:
A pneumatic relay responsive to an air input signal whose pressure represents a variable, the relay producing an air output signal proportional thereto. The relay includes an input chamber to which the input signal is fed, this chamber being separated from an output chamber by a diaphragm of elastomeric material. Air from a constant high-pressure supply is fed into the output chamber through an adjustable supply port that is operatively coupled to the diaphragm to cause this port to open to an extent determined by the deflection of the diaphragm in response to the force produced by the pressure of air in the input chamber until a point is reached where the pressure developed in the output chamber attains equilibrium with that in the input chamber. When input signal pressure thereafter decreases to produce an imbalance in the pressures in the input and output chambers, the diaphragm is deflected in the reverse direction to cause an exhaust port mounted on the diaphragm to open and admit air from the output chamber into an elastomeric exhaust tube leading to the atmosphere until a point is reached where equilibrium is restored. The output signal is derived from the output port of the output chamber.
REFERENCES:
patent: 2825354 (1958-03-01), Du Bois
patent: 2958337 (1960-11-01), Holbrook
patent: 4038999 (1977-08-01), Hayashida
patent: 4171004 (1979-10-01), Cerrato
Cohan Alan
Ebert Michael
Fischer & Porter Co.
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