# US 2019/0376534 A1 · Electromagnetic pressure reducing valve and fluid pressure control device including electromagnetic pressure reducing valve

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- Number: US 2019/0376534 A1
- Document ID: US20190376534A1
- Status: Published application
- Kind: A1
- Application number: 16/484,897
- Filed: 2018-02-13
- Published: 2019-12-12
- Earliest claimed: 2017-03-06
- Assignees: KYB Corporation
- Applicants: KYB Corporation
- Inventors: Masahiro EGAWA; Atsushi FUJII; Hideki YAMAGATA; Takeshi TERAO; Masanari KOJIMA
- Web page: https://patentgrep.com/patent/US20190376534A1

## CPC

- F15B 13/0402: {for linearly sliding valves, e.g. spool valves}
- F15B 13/025: {Pressure reducing valves}
- F15B 13/0433: {the pilot valves being pressure control valves (F15B13/0435, F15B13/0436, F15B13/0438 take precedence)}
- F16K 11/0716: {with fluid passages through the valve member (F16K11/0704, F16K11/0708, F16K11/0712 take precedence)}
- F16K 27/048: {Electromagnetically actuated valves}
- F16K 31/0613: {with cylindrical slides}
- G05D 16/2024: {the throttling means being a multiple-way valve}
- F15B: SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- 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

An electromagnetic pressure reducing valve includes a spool valve configured to allow or shut off communication between a pilot passage and a pilot pressure supply passage and a solenoid configured to give a thrust according to an intensity of a supplied electric current to the spool valve. The spool valve has a pressure receiving surface configured to generate a thrust in a direction opposite to the thrust by the solenoid by action of a pressure of a pilot pressure supply passage, and an area of the pressure receiving surface is set smaller than a cross sectional area of the spool valve.

## Claims

### Claim 1

An electromagnetic pressure reducing valve configured to reduce a pressure of a working fluid flowing in through an inlet passage and flowing out through an outlet passage to a predetermined pressure, comprising:
a valve body configured to allow or to shut off communication between the inlet passage and the outlet passage; and
a solenoid configured to give a thrust according to an intensity of a supplied electric current to the valve body, wherein
the valve body has a pressure receiving surface configured to generate a thrust in a direction opposite to the thrust by the solenoid by action of a pressure of the outlet passage; and
an area of the pressure receiving surface is set smaller than a cross sectional area of the valve body.

### Claim 2 (depends on 1)

The electromagnetic pressure reducing valve according to claim 1, further comprising:
a drain passage communicating with a tank configured to store the working fluid, wherein
the valve body further has a first land portion capable of shutting off the communication between the inlet passage and the outlet passage and a second land portion capable of shutting off the communication between the outlet passage and the drain passage;
the first land portion is provided closer to the solenoid side than the second land portion; and
an outer diameter of the first land portion is set larger than an outer diameter of the second land portion.

### Claim 3 (depends on 2)

The electromagnetic pressure reducing valve according to claim 2, wherein
the pressure receiving surface has an area of a size obtained by subtracting a sectional area of the second land portion from the sectional area of the first land portion.

### Claim 4 (depends on 2)

The electromagnetic pressure reducing valve according to claim 2, wherein
an end surface of the valve body on the second land portion side is faced with a drain chamber communicating with the drain passage.

### Claim 5 (depends on 1)

A fluid pressure control device including the electromagnetic pressure reducing valve according to claim 1, comprising:
a working fluid supply source configured to supply the working fluid to the inlet passage and to supply the working fluid to an outside; and
a control valve having a pilot pressure chamber to which the working fluid whose pressure is reduced by the electromagnetic pressure reducing valve is led through the outlet passage and configured to control a flow of the working fluid from the working fluid supply source to the outside in accordance with a magnitude of a pressure of the working fluid led to the pilot pressure chamber.