Pumps – Correlated pump and motor or clutch control
Patent
1975-03-31
1977-07-26
Vrablik, John J.
Pumps
Correlated pump and motor or clutch control
1281423, 1281456, 200 6186, 251191, 417440, F04B 4902
Patent
active
040379949
ABSTRACT:
A valve device is disclosed for unloading pressure from a compressor of the type utilized in a medical respirator. The device is formed with a cylindrical chamber containing a compressible elastomeric member. Inlet and relief ports of the valve open into the chamber, and the inlet port is connected with the outlet of the gas compressor. Bistable actuator means is provided for moving a plunger within the chamber which in turn causes the cylindrical member to assume either a compressed or uncompressed state. In its uncompressed state a radial clearance between the outer wall of the elastomeric member and the chamber provides a flow path between the inlet and relief ports to bleed pressure from the compressor. In its compressed state the elastomeric member expands to occlude the flowpath and prevent pressure bleed-off from the compressor. A switch is provided to open and close a circuit between the compressor and a source of electrical power responsive respectively to the uncompressed and compressed states of the elastomeric member.
REFERENCES:
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patent: 1942433 (1934-01-01), Lindsay
patent: 2083740 (1937-06-01), Paullin, Jr.
patent: 2434771 (1948-01-01), Mueller et al.
patent: 2925246 (1960-02-01), Sardeson
patent: 3095904 (1963-07-01), Thaning
patent: 3515135 (1970-06-01), Flower et al.
patent: 3700002 (1972-10-01), Christie
patent: 3788769 (1974-01-01), Glass et al.
patent: 3827827 (1974-08-01), Hill
patent: 3885739 (1975-05-01), Tuttle
Look Edward
Vrablik John J.
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