Automatic timer valve for controlling the output of irrigation p

Details Automatic timer valve for controlling the output of irrigation p Automatic timer valve for controlling the output of irrigation p

1980-04-15

1982-12-28

Cohan, Alan

Fluid handling

Self-proportioning or correlating systems

Supply and exhaust type

1376275, 13761411, F16K 1114

Patent

active

043656447

ABSTRACT:
An automatic timer valve for irrigation plant includes a tubular differential-area piston which defines respective major-diameter and minor-diameter chambers in a hollow valve body. The chambers normally communicate through the piston to allow water to flow interruptedly from an inlet to an outlet. A build-up of back-pressure at the outlet acts against the major face of the piston and, overcoming the inlet pressure, advances the piston against a spring to cause abutment of the shutter disc and an annular shoulder. This abutment cuts off the flow, with the exception of a restricted passage, and puts the outlet into communication with a drain outlet. When the pressure in the outlet drops, the higher relative pressure at the inlet displaces the piston in a reverse stroke and uninterrupted flow recommences.

REFERENCES:
patent: 3536089 (1970-10-01), Sarbach
patent: 3769997 (1973-11-01), Hardwick

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