Pneumatic relay

Details Pneumatic relay Pneumatic relay

1975-07-16

1976-07-27

Cohan, Alan

Fluid handling

Pressure modulating relays or followers

137 84, G05D 1600

Patent

active

039713962

ABSTRACT:
A pneumatic apparatus or relay which, in one embodiment, maintains the output pressure at a fixed level until the signal pressure obtains a predetermined value at which time the output pressure varies according to the signal pressure and, in a second embodiment, maintains the output pressure at a first level, which may be essentially zero, until the signal pressure obtains a predetermined value at which time the output pressure assumes a second level until the signal pressure reaches a second predetermined value and then the output pressure varies according to the signal pressure.

REFERENCES:
patent: 3297044 (1907-01-01), Thorburn
patent: 3605781 (1971-09-01), Joesting

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