Fluid-pressure operated pilot valve devices

Details Fluid-pressure operated pilot valve devices Fluid-pressure operated pilot valve devices

1978-12-15

1981-01-27

Cohan, Alan

Fluid handling

Self-proportioning or correlating systems

Supply and exhaust type

13762414, 13762415, F16K 31365

Patent

active

042469210

ABSTRACT:
A fluid-pressure operated pilot valve produces a cyclic modulation of pressure in a control duct, for operating a relay valve, by introducing a predetermined delay between the displacement of a first valve element from, and its return to, a first position against a first valve seat by a fluid-pressure operated timer device, which includes flow restrictor means and a pressure accumulator, acting upon the larger area side of a differential area actuator which vents the pressure in the control duct to an exhaust duct in a second position of the first valve element; the relay valve being operable in response to the cyclic pressure changes in the control duct to admit an irrigating liquid to an irrigation spray nozzle.

REFERENCES:
patent: 3326237 (1967-06-01), Frick
patent: 3380348 (1968-04-01), Kroffke
patent: 3720232 (1973-03-01), Corliss
patent: 4114515 (1978-09-01), Pauliukonis

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