# US 2015/0090352 A1 · Fluid-driven shutoff valve

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- Number: US 2015/0090352 A1
- Document ID: US20150090352A1
- Status: Published application
- Kind: A1
- Application number: 14/472,764
- Filed: 2014-08-29
- Published: 2015-04-02
- Earliest claimed: 2013-09-30
- Assignees: Ckd Corporation
- Applicants: Ckd Corporation
- Inventors: Yasunori NISHIMURA
- Web page: https://patentgrep.com/patent/US20150090352A1

## CPC

- F16K 31/04: using a motor
- F16K 31/1262: {one side of the diaphragm being spring loaded}
- F16K 31/50: with screw-spindle {or internally threaded actuating means}
- Y10T 137/7758: Pilot or servo controlled
- 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)}
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

An air-driven shutoff valve includes a valve seat formed in a main body, a valve element movable into or out of contact with the valve seat, a drive part integrally connected to the valve element, and a pilot opening/closing valve configured to supply compressed fluid to drive the drive part. The pilot opening/closing valve includes (a) a first needle valve, a first motor to change an opening degree of the first needle valve, and a first check valve allowing the compressed fluid to flow only from a pilot opening/closing valve side to a drive part side, and (b) a second needle valve, a second motor to change an opening degree of the second needle valve, and a second check valve allowing the compressed fluid to flow only from the drive part side to the pilot opening/closing valve side.

## Claims

### Claim 1

A fluid-driven shutoff valve including:
a main body formed with an inlet passage and an outlet passage;
a valve seat formed in the main body;
a valve element movable into or out of contact with the valve seat;
a drive part integrally connected to the valve element; and
a pilot opening/closing valve configured to supply compressed fluid to drive the drive part,
wherein the pilot opening/closing valve includes:
(a) a first needle valve, a first motor configured to change an opening degree of the first needle valve, and a first check valve configured to allow the compressed fluid to flow only from the pilot opening/closing valve side to the drive part side, and
(b) a second needle valve, a second motor configured to change an opening degree of the second needle valve, and a second check valve configured to allow the compressed fluid to flow only from the drive part side to the pilot opening/closing valve side,
wherein each of the first and second needle valves includes a needle valve element and a needle valve seat, and
the shutoff valve further includes a vertically-moveable member placed between the first motor and the first needle valve, and a vertically-moveable member placed between the second motor and the second needle valve, each of the vertically-movable members being to be moved by driving of the corresponding first and second motors to relatively move the respective needle valve elements with respect to the needle valve seats.

### Claim 2 (depends on 1)

The fluid-driven shutoff valve according to claim 1,
wherein a piston of the drive part is a diaphragm type, and
the first and second motors are stepping motors.

### Claim 3 (depends on 1)

The fluid-driven shutoff valve according to claim 1,
wherein the fluid-driven shutoff valve is integrally formed with a suck-back valve having an inlet passage, the outlet passage of the fluid-driven shutoff valve being communicated with the inlet passage of the suck-back valve, and
the fluid-driven shutoff valve is configured to be operated in sync with the suck-back valve.

### Claim 4 (depends on 3)

The fluid-driven shutoff valve according to claim 3, further including:
a nozzle communicated with an outlet passage of the suck-back valve, and
a sensor placed at a distal end of the nozzle and configured to detect a state of a fluid in the nozzle,
wherein the shutoff valve is configured to change the opening degree of the first needle valve based on a detected result of the sensor to adjust a closing speed of the diaphragm valve element, and
the shutoff valve is configured to change the opening degree of the second needle valve based on the detected result of the sensor to adjust an opening speed of the diaphragm valve element.

### Claim 5 (depends on 2)

The fluid-driven shutoff valve according to claim 2,
wherein the fluid-driven shutoff valve is integrally formed with a suck-back valve having an inlet passage, the outlet passage of the fluid-driven shutoff valve being communicated with the inlet passage of the suck-back valve, and
the fluid-driven shutoff valve is configured to be operated in sync with the suck-back valve.

### Claim 6 (depends on 5)

The fluid-driven shutoff valve according to claim 5, further including:
a nozzle communicated with an outlet passage of the suck-back valve, and
a sensor placed at a distal end of the nozzle and configured to detect a state of a fluid in the nozzle,
wherein the shutoff valve is configured to change the opening degree of the first needle valve based on a detected result of the sensor to adjust a closing speed of the diaphragm valve element, and
the shutoff valve is configured to change the opening degree of the second needle valve based on the detected result of the sensor to adjust an opening speed of the diaphragm valve element.