# US 2018/0023726 A1 · Flow rate adjusting device

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- Number: US 2018/0023726 A1
- Document ID: US20180023726A1
- Status: Published application
- Kind: A1
- Application number: 15/651,294
- Filed: 2017-07-17
- Published: 2018-01-25
- Earliest claimed: 2016-07-20
- Assignees: Surpass Industry Co., Ltd.
- Applicants: Surpass Industry Co., Ltd.
- Inventors: Kazuki HIRAI
- Web page: https://patentgrep.com/patent/US20180023726A1

## CPC

- F16K 31/365: the fluid acting on a diaphragm
- F16K 31/1221: {one side of the piston being spring-loaded}
- F16K 31/1225: {with a plurality of pistons}
- F16K 31/50: with screw-spindle {or internally threaded actuating means}
- G05D 16/185: {using membranes within the main valve}
- F16K: VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING {(devices for emptying and evacuating the excess liquid in valves or conduits F16L55/07)}
- G05D: SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES

## Abstract

Provided is a flow rate adjusting device in which a body portion having a valve hole includes: an annular wall portion that partitions a downstream-side fluid chamber into an inside flow channel annularly formed around a valve body portion and an outside flow channel annularly formed at an outside of the inside flow channel; an outflow hole that guides the fluid circulating in the outside flow channel to an outflow-side flow channel; and a blocking wall that blocks the fluid having reached the outflow hole from flowing around the outside flow channel. The annular wall portion includes a communication flow channel that guides the fluid from the inside flow channel to the outside flow channel. The communication flow channel guides the fluid to a location that is adjacent to the blocking wall and is isolated from the outflow hole by the blocking wall.

## Claims

### Claim 1

A flow rate adjusting device comprising:
a valve body portion movable along an axis line;
a body portion having a valve hole into which the valve body portion is inserted;
a diaphragm portion that is coupled to the valve body portion and partitions an inside space of the body portion into a fluid chamber and a gas chamber, a fluid flowing in from the valve hole circulating in the fluid chamber; and
a flow rate adjusting portion that adjusts an interval between the valve body portion and the valve hole by allowing the diaphragm portion to move along the axis line, wherein
the body portion includes:
an inflow-side flow channel that guides a fluid flowing in from an inflow port to the fluid chamber;
an outflow-side flow channel that guides a fluid flowing out from the fluid chamber to an outflow port;
an annular wall portion that partitions the fluid chamber into an inside flow channel and an outside flow channel, the inside flow channel being annularly formed around the valve body portion, the outside flow channel being annularly formed at an outside of the inside flow channel;
an outflow hole that guides a fluid circulating in the outside flow channel to the outflow-side flow channel; and
a blocking wall that is disposed in the outside flow channel and blocks the fluid having reached the outflow hole from flowing around the outside flow channel,
the annular wall portion includes a communication flow channel that guides the fluid from the inside flow channel to the outside flow channel, and
the communication flow channel guides the fluid to a location that is adjacent to the blocking wall and is isolated from the outflow hole by the blocking wall.

### Claim 2 (depends on 1)

The flow rate adjusting device according to claim 1, wherein
the diaphragm portion includes:
a base to be coupled to the valve body portion; and
a thin-film portion that is connected to an outer peripheral end of the base and is annularly formed,
when the base and the annular wall portion are in contact with each other, a circulation of the fluid in a space between the inside flow channel and the outside flow channel is interrupted at a location other than a location where the communication flow channel is disposed.

### Claim 3 (depends on 2)

The flow rate adjusting device according to claim 2, further comprising an urging member that imparts, to the valve body portion, a first urging force in a direction in which the urging member is in contact with the valve hole, and
the flow rate adjusting portion imparts, to the valve body portion, a second urging force in a direction in which the flow rate adjusting portion is spaced apart from the valve hole by a compressed air introduced into the gas chamber.