Valve and fluid control device with a magnetic indicator

Patent metadata

Field	Value
Publication number	US-12085186-B2
Application number	US-202217935670-A
Country	US
Kind code	B2
Filing date	Sep 27, 2022
Priority date	Oct 29, 2021
Publication date	Sep 10, 2024
Grant date	Sep 10, 2024

Abstract

A valve which can accurately detect an operation of the valve is provided.The valve includes a valve body defining a fluid flow passage, a valve disk operating to be able to open and close the fluid flow passage, an actuator driving the valve disk by supplying or interrupting a working fluid, a stem transmitting a driving force of the actuator to the valve disk, a detection means detecting an opening and closing operation of the valve disk, and an elastic member fixing a ring-shaped magnetic body inserted through an end of the stem to the stem. The detection means includes the magnetic body fixed by the elastic member, and a magnetic sensor detecting a change in a magnetic field of the magnetic body.

First claim

The invention claimed is:

1. A valve comprising:
a valve body defining a fluid flow passage;
a valve disk configured to be operable to open and close the fluid flow passage;
an actuator configured to drive, with a driving force, the valve disk by supplying or interrupting a working fluid;
a stem configured to transmit the driving force of the actuator to the valve disk, wherein the stem extends in an axial direction and is configured with a stepped surface, an outer peripheral surface, and a recess that extends along a circumferential direction on the outer peripheral surface and is spaced from the stepped surface by a distance in the axial direction;
a detection means configured to detect an opening and closing operation of the valve disk; and
an elastic member configured to fit in the recess in an arrangement fixing a ring-shaped magnetic body, inserted through an end of the stem, against the stepped surface of the stem;
wherein the detection means comprises:
the ring-shaped magnetic body fixed against the stepped surface of to the stem by the elastic member, and
a magnetic sensor configured to detect a change in a magnetic field of the ring-shaped magnetic body.

2. The valve according to claim 1 , wherein
the recess is an annular recess that is configured with an inclined surface having a diameter expanding outward to the outer peripheral surface of the stem.

3. The valve according to claim 1 ,
wherein the actuator comprises an actuator cap storing a pressure chamber, to which a working fluid is supplied, inside, and protruding one end of the stem to an outside on a side opposite to the valve disk,
the valve further comprising:
a sensor cap covering the detection means together with one end of the stem, and
a bolt inserted into a bolt hole of the sensor cap, wherein the bolt is fastened to a fastening groove provided on an outer peripheral surface of the actuator cap.

4. The valve according to claim 3 , wherein an inclined part, having a diameter expanding outward, is formed in a vicinity of the fastening groove.

5. The valve according to claim 3 , wherein the magnetic sensor is attached to an outer surface of the actuator cap.

6. The valve according to claim 3 , wherein the magnetic sensor is attached to an inside of the sensor cap.

7. A fluid control device comprising a valve,
wherein the valve comprises:
a valve body defining a fluid flow passage;
a valve disk configured to be operable to open and close the fluid flow passage;
an actuator configured to drive, with a driving force, the valve disk by supplying or interrupting a working fluid;
a stem configured to transmit the driving force of the actuator to the valve disk, wherein the stem extends in an axial direction and is configured with a stepped surface, an outer peripheral surface, and a recess that extends along a circumferential direction on the outer peripheral surface and is spaced from the stepped surface by a distance in the axial direction;
a detection means configured to detect an opening and closing operation of the valve disk; and
an elastic member configured to fit within the recess in an arrangement fixing a ring-shaped magnetic body, inserted through an end of the stem, against the stepped surface of the stem;
wherein the detection means comprises:
the ring-shaped magnetic body fixed against the stepped surface of the stem by the elastic member, and
a magnetic sensor configured to detect a change in a magnetic field of the magnetic body.

8. The valve according to claim 1 , wherein the elastic member comprises an O-ring.

Assignees

• Fujikin Kk

Inventors

• Tsujino Kengo
• Nakada Tomoki
• TANNO Ryutaro
• Suzuki Yuya
• Harada Akihiro
• Shinohara Tsutomu

Classifications

• F16K27/02

  of lift valves (for reducing the flow resistance of screw-spindle lift-valves F16K1/06) · CPC title

• F16K27/0236

  Diaphragm cut-off apparatus · CPC title

• F16K31/1225

  with a plurality of pistons · CPC title

• F16K37/0033

  using a permanent magnet, e.g. in combination with a reed relays · CPC title

• F16K31/126 Primary

  the fluid acting on a diaphragm, bellows, or the like (F16K31/145, F16K31/165, F16K31/365, F16K31/385 take precedence) · CPC title