Fluid handling – Line condition change responsive valves – Direct response valves
Patent
1980-01-31
1981-11-17
Cline, William R.
Fluid handling
Line condition change responsive valves
Direct response valves
137613, 137853, F16K 1514
Patent
active
043005934
ABSTRACT:
A back pressure regulator and non-return valve is provided herein. It includes a hollow plug having an open inlet end and a closed end having a central aperture therethrough. A closure cap is hermetically slidably disposed within the hollow plug. A plurality of outlet perforations are provided from the hollow plug, the apertures being disposed along helical paths along the outer periphery thereof. Finally, a tubular resilient diaphragm sleeve of non-uniform wall thickness envelopes the apertured portion of the hollow plug, the resilient sleeve being secured to the hollow plug at its base only adjacent the open inlet end thereof. Control of the outflow through an annular outflow path between the hollow plug and the tubular resilient diaphragm to require greater gaseous pressure is provided by changing the number of the outlet apertures in the effective outlet length of the hollow plug. The threshold pressure required to move the diaphragm away from the hollow plug to provide the annular outflow path is increased, dependent on the wall thickness. Gas having a pressure lower than that threshold pressure will not flow out. Non-return function is provided by gas pressure on the outside of the tubular resilient diaphragm which seals the annular outflow path.
REFERENCES:
patent: 384306 (1888-06-01), Bourdil
patent: 1854518 (1932-04-01), Little
patent: 2482651 (1949-09-01), Burt
patent: 3384113 (1968-05-01), Pennisi
patent: 3880399 (1975-04-01), Luthe
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