Diaphragm valve

Patent metadata

Field	Value
Publication number	US-10030789-B2
Application number	US-201414896113-A
Country	US
Kind code	B2
Filing date	May 12, 2014
Priority date	Jun 4, 2013
Publication date	Jul 24, 2018
Grant date	Jul 24, 2018

Abstract

There is provided a diaphragm valve capable of reliably detecting damage to a diaphragm before breakage of the diaphragm in spite of the simple structure. A diaphragm includes a plurality of diaphragm layers. The uppermost diaphragm layer is provided with wiring. An abnormality of the diaphragm is detected by detecting breakage of the wiring.

First claim

The invention claimed is:

1. A diaphragm valve comprising:
a body provided with a fluid inflow passage, a fluid outflow passage, and a concave portion opened upward;
an annular seat disposed on a bottom of the concave portion of the body; and
a diaphragm which opens and closes a fluid passage by being pressed against or separated from the seat, the diaphragm being elastically deformable,
wherein the diaphragm includes a first metal diaphragm layer and a second metal diaphragm layer separatable from each other forming a plurality of diaphragms, wiring is provided on only one of the plurality of metal diaphragm layers that receives the largest stress, an insulating layer is provided between the wiring and the diaphragm layer that received the largest stress and an abnormality of the diaphragm is detected by detecting breakage of the wiring.

2. The diaphragm valve according to claim 1 ,
wherein the plurality of diaphragms further include a third metal diaphragm layer.

3. The diaphragm valve according to claim 1 ,
wherein the wiring is covered with a protecting layer.

4. A diaphragm valve comprising:
a body provided with a fluid inflow passage, a fluid outflow passage, and a concave portion opened upward;
an annular seat disposed on a bottom of the concave portion of the body; and
a diaphragm which opens and closes a fluid passage by being pressed against or separated from the seat, the diaphragm being elastically deformable,
wherein the diaphragm includes a first metal diaphragm layer and a second metal plurality of diaphragm layer separatable from each other forming a plurality of diaphragms, wiring is provided on only the uppermost diaphragm layer of the plurality of metal diaphragm layers, an insulating layer is provided between the wiring and the uppermost diaphragm layer and an abnormality of the diaphragm is detected by detecting breakage of the wiring.

5. The diaphragm valve according to claim 4 ,
wherein the plurality of diaphragms further include a third metal diaphragm layer.

6. The diaphragm valve according to claim 4
wherein the wiring is covered with a protective layer.

Assignees

• Fujikin Kk

Inventors

• Shinohara Tsutomu
• Yamaji Michio
• Nishino Kouji
• Dohi Ryousuke
• Ikeda Nobukazu
• Doh Toshio

Classifications

• F16K37/0083 Primary

  by measuring valve parameters · CPC title

• Y10T137/5994

  Diaphragm type · CPC title

• G01N27/20

  Investigating the presence of flaws · CPC title

• F16K7/17

  the diaphragm being actuated by fluid pressure · CPC title