Valves and valve actuation – Fluid actuated or retarded – Flexible wall expansible chamber reciprocating valve actuator
Patent
1977-03-02
1978-07-04
Rosenthal, Arnold
Valves and valve actuation
Fluid actuated or retarded
Flexible wall expansible chamber reciprocating valve actuator
251 612, F16K 31365
Patent
active
040984877
ABSTRACT:
A device for controlling oil injection to a screw compressor, the device comprising an oil stop valve having a closing element mounted at one end of a valve stem slidably and sealingly received in a bore connecting the valve with a housing divided by a diaphragm mounted on the other end of the valve stem into two chambers, one chamber being connectable to the compressor output and when pressurized, serving to act on the diaphragm to open the valve, and the other chamber communicating with the valve via an axial bore in the valve stem and when pressurized, serving to act on the diaphragm to close the valve, the valve stem in its portion received in the bore having a cross-sectional area approximately equal to the effective sealing surface area of the closing element.
REFERENCES:
patent: 2811167 (1957-10-01), Bott
patent: 3556463 (1971-01-01), Williams
patent: 3874629 (1975-04-01), Fontaine
Hoerbiger Ventilwerke Aktiengesellschaft
Rosenthal Arnold
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