Valves and valve actuation – Fluid actuated or retarded – Pilot or servo type motor
Patent
1976-03-15
1977-07-12
Rosenthal, Arnold
Valves and valve actuation
Fluid actuated or retarded
Pilot or servo type motor
251 61, 251 46, 92 34, 1374895, F01B 1902, F16J 300
Patent
active
RE0293024
ABSTRACT:
The present invention deals with a bag diaphragm comprising one or more flattened extremely flexible bags assembled together, to be mounted between rigid plates at a variable mean distance and to be inflated in operation by a variable pressure difference, and with an air damper operated by means of a bag diaphragm as mentioned above, this air damper being suitable for air conditioning plants, in constant flow, or constant variable flow, or mixing appliances, in fresh air and return air ducts, where an air flow is to be controlled, the operation of the air damper being possible without any electrical or pneumatic energy supply system, due to the particular characteristics of the aforesaid bag diaphragm and particular design of the damper.
REFERENCES:
patent: 1128228 (1915-02-01), Collar
patent: 1579183 (1926-03-01), Weiland
patent: 1724977 (1929-08-01), Stein
patent: 2676609 (1954-04-01), Pfarrer
patent: 2686034 (1954-08-01), Rabal
patent: 2704648 (1955-03-01), Cobb
patent: 3151628 (1964-10-01), Heckert
patent: 3202061 (1965-08-01), Johnston
patent: 3495502 (1970-02-01), Bousso
patent: 3506038 (1970-04-01), Perry et al.
Danfoss A/S
Rosenthal Arnold
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