Fluid handling – Line condition change responsive valves – Pilot or servo controlled
Patent
1980-12-04
1983-01-11
Cohan, Alan
Fluid handling
Line condition change responsive valves
Pilot or servo controlled
1374925, F16K 1710
Patent
active
043677673
ABSTRACT:
A servo-type gas pressure relief valve for regulating air pump pressure to pneumatic components of a medical ventilator or similar equipment utilizes a small diaphragm-type bleed or pilot valve to control the action of a main diaphragm valve. A small amount of inlet gas from the bottom side of the large diaphragm is passed through a restricted orifice to the top side of the large diaphragm. The bleed valve bleeds this gas to the atmosphere at a selected pressure, said bleeding action creating a pressure differential across the diaphragm of the main valve, which is thereby opened to exhaust gas to the atmosphere. A screw adjustment exerts tension on a spring which, in turn, exerts a force on the upper part of the bleed valve diaphragm. By adjusting the tension on the spring, the pressure at which air is bled to the atmosphere can be controlled, thereby accurately controlling the pressure at which the main valve opens.
REFERENCES:
patent: 2416855 (1947-03-01), St. Clair
patent: 2737974 (1956-03-01), Renick
patent: 2904035 (1959-09-01), Andreasen
patent: 3036778 (1962-05-01), Dillman
patent: 3461908 (1969-08-01), Newcomb et al.
patent: 3545887 (1970-12-01), Kobnick
patent: 3578018 (1971-05-01), Dillon
patent: 3648716 (1972-04-01), Joesting
patent: 3662779 (1972-05-01), Weber et al.
patent: 4058287 (1977-11-01), Fromfield
patent: 4151856 (1979-05-01), Burrus
Bear Medical Systems, Inc.
Cohan Alan
Klein Howard J.
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