On/off valve capable of drawing back fluid when closed

Details On/off valve capable of drawing back fluid when closed On/off valve capable of drawing back fluid when closed

1993-09-14

1995-07-04

Kashnikow, Andres

Fluid sprinkling, spraying, and diffusing

With cleaning means, drip collecting, waste disposal or soil...

Nozzle cleaner, flusher or drainer

239223, 239296, 251 636, B05B 1502, B05B 310

Patent

active

054293049

ABSTRACT:
An OFF/OFF valve including a fluid passage formed in the valve body, and having a valve seat, a smaller diameter portion extending from the valve seat on a downstream side of the valve seat, and a larger diameter portion extending from the smaller diameter portion on a downstream side of the smaller diameter portion. A valve element is disposed so as to be movable between a position adjacent the valve seat and a position within the larger diameter portion. The valve element is driven by a valve element driving assembly. When the valve is closed, the valve element moves toward the valve seat. When the valve element moves within the smaller diameter portion, the fluid which has passed through the valve element is drawn back due to the pumping effect of the valve element before the valve element finally reaches the valve seat and the valve is completely closed.

REFERENCES:
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patent: 4597719 (1986-07-01), Tano
patent: 5027919 (1991-07-01), Silva et al.
patent: 5092362 (1992-03-01), Yie
patent: 5100057 (1992-03-01), Wacker et al.
patent: 5156336 (1992-10-01), Hammond et al.

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