Fluid handling – With indicator – register – recorder – alarm or inspection means – Position or extent of motion indicator
Patent
1977-02-28
1978-08-22
Cohan, Alan
Fluid handling
With indicator, register, recorder, alarm or inspection means
Position or extent of motion indicator
137559, 1376256, 13762566, 1376255, F16K 1104
Patent
active
041082052
ABSTRACT:
A valve arrangement for amplifying the effect of the application or removal of atmospheric pressure upon a fluid pressure responsive actuator element such as a pneumatic cylinder or bellows comprising superposed chambers one connected to the atmosphere and the other to a source of vacuum and intermediately of them a chamber connected to the fluid pressure responsive actuator element and forming actually the beginning of a conduit leading to the actuator element. The middle chamber may selectively be set to communicate with one or the other of the two outer chambers through aligned openings in the walls that separate these chambers from the middle chamber and that may alternately be closed by a common stopper which can be moved to close one or the other of the openings so that either atmospheric air or a vacuum is applied through this middle chamber to the actuator element. For this purpose the stopper is mounted on a stem which is connected to a diaphragm that forms the ceiling of the air admission chamber and at the same time the floor of a fourth chamber which is under atmospheric pressure through a pipe leading to the outside atmosphere, but is evacuated when the pipe is closed, by a thin channel leading from the source of vacuum through the stem of the stopper to this fourth chamber.
REFERENCES:
patent: 2907345 (1959-10-01), Randall
patent: 3167093 (1965-01-01), George
patent: 3368751 (1968-02-01), Merrill
patent: 3430437 (1969-03-01), Saussele
patent: 3749127 (1973-07-01), Beeken
patent: 3774637 (1973-11-01), Weber
patent: 3859619 (1975-01-01), Ishihara
patent: 3861642 (1975-01-01), Maddocks
Cohan Alan
Pneumeric Corp.
Tauchen Kurt A.
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