Suck back valve

Details Suck back valve Suck back valve

2005-06-28

2008-11-04

Tran, Len (Department: 3752)

Fluid sprinkling, spraying, and diffusing

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

Nozzle cleaner, flusher or drainer

C239S071000, C239S073000, C239S106000, C239S586000, C222S571000, C251S030020, C251S063500, C251S331000

Reexamination Certificate

active

07445163

ABSTRACT:
A suck back valve comprises an ON/OFF valve, a suck back mechanism which includes a second piston connected to a second diaphragm to make displacement integrally and a second spring member fastened to the second piston, a load sensor which detects a load applied by a resilient force of the second spring member corresponding to a pressure of a pilot pressure to be supplied, and a second control unit which detects loads before and after displacement of the second diaphragm by using the load sensor to calculate a displacement amount of the second diaphragm based on a difference between the detected loads.

REFERENCES:
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Pending U.S. Appl. No. 11/165,347, filed Jun. 24, 2005, by Yoshihiro Fukano et al.

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