Fluid handling – Line condition change responsive valves – Direct response valves
Reexamination Certificate
2004-06-15
2008-11-25
Rivell, John (Department: 3753)
Fluid handling
Line condition change responsive valves
Direct response valves
C137S843000, C137S853000
Reexamination Certificate
active
07455071
ABSTRACT:
The object of this invention is to provide a hydraulic control valve for drip hoses, which controls a flow of water according to a water pressure, thus keeping a pressure of Water fed to a drip hose constant. The hydraulic control valve includes a hose connector (110) clamped at opposite ends thereof to a branch hose (H/S) and a drip hose (H/N), a water supply path having a larger-diameter path (120a) and a smaller-diameter path (120b), a U-shaped flexible cup (200), and a support ring (300). The Larger-diameter path includes a stepped seat (142) having projections (141) and depressions (142). The smaller-diameter path includes an inward projecting step (150). The cup is placed at an end thereof to be near to the inward projecting step, and includes a flange (210). The support ring (300) is fitted into the larger-diameter path to prevent a removal of the cup.
REFERENCES:
patent: 699273 (1902-05-01), Wolski
patent: 2223944 (1940-12-01), Roy
patent: 3985336 (1976-10-01), Bentley
patent: 3998244 (1976-12-01), Bentley
patent: 4022244 (1977-05-01), Oman
patent: 5137216 (1992-08-01), Hanish
patent: 5323806 (1994-06-01), Watari et al.
patent: 6085986 (2000-07-01), Yu
patent: 200306609 (2003-02-01), None
Bame James E.
IPLA P.A.
Rivell John
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