US 4,788,389 AGranted

Flow switch valve

AssigneeOmco Inc.

InventorTatsuo Okazaki

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Abstract

A flow switch valve including a housing main body comprising a plurality of valve casings stacked contiguously and each having a fluid flow channel and a valve seat member, a valve member passing slidably through said valve casings and having valve bodies corresponding respectively to the valve heat members of the valve casings, a diaphragm disposed to any of the valve casings and supporting the valve member, and a signal generation device for detecting the position of the valve member in the housing main body and generating a detection signal. The valve member moves slidably depending on the change of the fluid pressure in the chamber partitioned by a diaphragm, by which valves for the fluid flow channels in the plurality of valve casings are opened or closed interlocking therewith and, at the same time, a detection signal for the position of the valve member is generated.

Claims5

Dependent claims

A flow switch valve comprising:

a housing main body including a plurality of valve casings which are stacked contiguously with each other, and each of which is in the shape of a hollow body having a fluid inlet portion and a fluid exit portion partitioned from each other by a valve seat member disposed in the hollow body,
a control chamber disposed to the outside of said fluid inlet portion of one of said valve casings by way of a diaphragm resiliently supported on said casings,
a valve member comprising a shaft supported by said diaphragm and extended and passing through the plurality of said valve casings and a plurality of valve bodies disposed to said shaft, each corresponding to said valve seat member in each of said valve casings,
a fluid channel formed through the shaft of said valve member so as to communicate said control chamber with the fluid exit portion in one of said valve casings, and
a signal generation device for generating a switching signal upon a predetermined movement of said valve member.

2 more elements

Dependencies are inferred from the claim text.