Diaphragm valves

Details Diaphragm valves Diaphragm valves

2006-07-04

2006-07-04

Walczak, David J. (Department: 3751)

Valves and valve actuation

Fluid actuated or retarded

Piston type expansible chamber reciprocating valve actuator

C251S282000

Reexamination Certificate

active

07070160

ABSTRACT:
A diaphragm valve capable of increasing durability of a diaphragm comprises a valve body internally formed with a valve chamber having an open upper end and a suck-back chamber having an open lower end, between an inlet passage and an outlet passage, and a through hole which provides communication between the valve chamber and the suck-back chamber. The open end of the valve chamber is closed by a first diaphragm which is brought into and out of contact with a valve seat. The open end of the suck-back chamber is closed by a second diaphragm. The first and second diaphragms are substantially identical in shape. Each circumferential edge portion of the first and second diaphragms is tightly retained by a retaining member mountable to the valve body so that the diaphragms are curved outwardly with respect to the valve chamber and the suck-back chamber respectively. The first and second diaphragms are connected by a connecting rod passing through the through hole so that the diaphragms are deformed synchronously by operation of an actuator.

REFERENCES:
patent: 3753526 (1973-08-01), Johnson
patent: 6029903 (2000-02-01), Fukano et al.
patent: 6199582 (2001-03-01), Matsuzawa et al.
patent: 2003/0111178 (2003-06-01), Morita
patent: A 2003-185053 (2003-07-01), None

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