Fluid handling – Line condition change responsive valves – Direct response valves
Patent
1973-12-14
1977-05-10
Cline, William R.
Fluid handling
Line condition change responsive valves
Direct response valves
137859, F16K 1514
Patent
active
040222446
ABSTRACT:
A cylindrical cap having a closed end except for a single small opening is internally threaded and arranged to receive a resilient washer and resilient disc overlying the washer. The disc has a small single opening. A coupling tube is threaded into the cap to hold the disc against the annular washer so that a small area is defined within the annular shoulder defined by the washer. The coupling tube includes a stem at its other end for connection to a lateral water line in an irrigation system. The arrangement is such that when water pressure is below a predetermined operating pressure, the water can pass through the opening in the disc and out the small opening in the end cap to purge the line. The disc and end cap openings are radially displaced such that when the water pressure equals or exceeds a predetermined operating pressure, the disc is moved into the central area within the shoulder to seat against the closed end and thus close off its single opening, thereby blocking water flow so that normal irrigation can take place.
REFERENCES:
patent: 2722370 (1955-11-01), Owsen et al.
patent: 3693888 (1972-09-01), Rondas et al.
patent: 3697002 (1972-10-01), Parkison
patent: 3718152 (1973-02-01), Kraakman
patent: 3753527 (1973-08-01), Galbraith et al.
patent: 3807430 (1974-04-01), Keller
Cline William R.
Pastoriza Ralph B.
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