Fluid handling – Line condition change responsive valves – Direct response valves
Patent
1980-06-30
1981-09-22
Cline, William R.
Fluid handling
Line condition change responsive valves
Direct response valves
F16K 1514
Patent
active
042904544
ABSTRACT:
A back flow valve comprising a housing having an inlet and an outlet and a tube mounted in the housing and having a open end communicating with the inlet in said housing. The tube has the other end thereof closed and has a plurality of circumferentially and longitudinally spaced openings at the center thereof such that liquid can only flow from the inlet to the housing through the openings in the tube to the outlet of said housing. An elastic sleeve is telescoped over the tube and normally closes the opening, the inside diameter of the sleeve being less than the outer diameter of the tube. The tube has longitudinally spaced abutments adjacent the ends of the sleeve and the length of the sleeve is less than the longitudinal distance between the abutments. The ends of the sleeve have portions thereof extending axially beyond other portions thereof such that as liquid pressure is built up, the liquid stretches the sleeve and flows out of the openings in the tube and along the exterior of the tube and the liquid engages said abutments and in cooperation with the longitudinally extending portions causes the sleeve to rotate facilitating the opening and closing of the sleeve even after prolonged periods of time and preventing foreign matter from remaining between the sleeve and the tube.
REFERENCES:
patent: 384306 (1888-06-01), Bourdil
patent: 1800066 (1931-04-01), Glass
patent: 2715980 (1955-08-01), Frick
patent: 3179124 (1965-04-01), Haring
patent: 3448766 (1969-06-01), Schule
patent: 3814132 (1974-06-01), Greenwood et al.
patent: 4039139 (1977-08-01), Bird
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