Pilot-operated diaphragm valve with separate on/off control

Details Pilot-operated diaphragm valve with separate on/off control Pilot-operated diaphragm valve with separate on/off control

1992-01-02

1993-08-24

Schwadron, Martin P.

Fluid handling

Systems

Flow path with serial valves and/or closures

251 46, F16K 31145

Patent

active

052380246

ABSTRACT:
A diaphragm valve assembly adapted for use in irrigation systems as a zone valve includes a solenoid-operated diaphragm to control flow through the valve under normal operations, and a ball valve is situated between an inlet port and one or more outlet ports and is selectively movable to a position closing the valve to prevent liquid flow therethrough independently of the opening and closing of the diaphragm so as to permit servicing or repair of the valve without shutting off the entire system.

REFERENCES:
patent: 2492873 (1949-12-01), Lamb
patent: 2984256 (1961-05-01), Wildern
patent: 3433262 (1969-03-01), Ray
patent: 3604456 (1971-09-01), Jones
patent: 3967808 (1976-07-01), Lieding
patent: 4590967 (1986-05-01), Schmitt
patent: 4685310 (1987-08-01), Stegmann et al.

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