Dispenser for irrigation chemicals with fail-safe antisiphon val

Details Dispenser for irrigation chemicals with fail-safe antisiphon val Dispenser for irrigation chemicals with fail-safe antisiphon val

1989-10-13

1990-11-20

Cohan, Alan

Fluid handling

Processes

Involving pressure control

137268, 137218, 422282, 222310, A01C 2300

Patent

active

049710915

ABSTRACT:
A dispenser for irrigation chemicals includes an antisiphon or vacuum breaker valve which includes redundant valve members disposed at differing levels to on the one hand ensure communication of ambient pressure to the valve outlet, and on the other hand ensuring that no subambient pressure at the valve inlet is communicated to the outlet of the valve. The differing levels of the two redundant valves ensures also that backflow water from the outlet is vented to ambient without reaching a level sufficient to allow flow into the inlet flow path of the valve. The dispenser includes means to sealingly receive a chambered cartridge of irrigation chemical having a frangible diaphragm capturing the chemical therewithin, and means for penetrating the diaphragm in response to a low of irrigating water to dispense the chemical material along with the irrigating water flow.

REFERENCES:
patent: 2282188 (1942-05-01), Horne
patent: 2960996 (1960-11-01), Haselton
patent: 3180352 (1965-04-01), Kersten
patent: 3424188 (1969-01-01), Whitaker
patent: 4846403 (1989-07-01), Mivelaz

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