# US 2009/0260699 A1 · Throttling structure for use in a fluid pressure device

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- Number: US 2009/0260699 A1
- Document ID: US20090260699A1
- Status: Published application
- Kind: A1
- Application number: 12/359,551
- Filed: 2009-01-26
- Published: 2009-10-22
- Earliest claimed: 2008-04-21
- Assignees: SMC Corporation
- Inventors: Toru HORIUCHI; Kenji Tsukamoto
- Web page: https://patentgrep.com/patent/US20090260699A1

## CPC

- G05D 16/0672: {using several spring-loaded membranes}
- Y10T 137/261: Relief port through common sensing means
- Y10T 137/7769: Single acting fluid servo
- Y10T 137/7798: Ancillary reactor surface responds to inlet pressure
- Y10T 137/8733: Fluid pressure regulator in at least one branch
- G05D: SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

The present invention relates to a throttling structure for use in a fluid pressure device. A nozzle passage is formed between a primary side port and a nozzle back pressure chamber. A throttling mechanism made up from a plurality of orifice plates is disposed in the nozzle passage. Small diameter opening holes, which are smaller in diameter than the nozzle passage, are provided in the orifice plates. Outer edge portions of the orifice plates are retained in a second body part via seal members. Further, the orifice plates are separated mutually from each other by a predetermined distance along the direction of extension of the nozzle passage.

## Claims

### Claim 1

A throttling structure for use in a fluid pressure device having a body in which a port is formed to which a pressure fluid is supplied, for carrying out a pressure control on the pressure fluid, comprising:
an introduction chamber into which the pressure fluid is introduced;
a communication passage that provides communication between the introduction chamber and the port; and
a throttling mechanism disposed in the communication passage and having a plurality of flow passages through which the pressure fluid flows, the flow passages being smaller in diameter than the communication passage, for reducing a flow amount of the pressure fluid,
wherein the plurality of flow passages are disposed mutually adjacent to each other at predetermined intervals along a flow direction of the pressure fluid.

### Claim 2 (depends on 1)

The throttling structure according to claim 1, wherein the plural flow passages are arranged in parallel to the flow direction of the pressure fluid, and further, are separated mutually from each other along a direction of extension of the communication passage.

### Claim 3 (depends on 2)

The throttling structure according to claim 2, wherein the plural flow passages are disposed along a straight line coaxially in the communication passage.

### Claim 4 (depends on 2)

The throttling structure according to claim 2, wherein the plural flow passages are mutually off-centered in a perpendicular direction with respect to a direction of extension of the communication passage.

### Claim 5 (depends on 3)

The throttling structure according to claim 3, wherein among the plurality of flow passages, a flow amount of the pressure fluid is made to change by changing a distance between two adjacent flow passages.

### Claim 6 (depends on 5)

The throttling structure according to claim 5, wherein among the plurality of flow passages, the distance between two adjacent flow passages is set to be at least 20 times the diameter of the flow passages.

### Claim 7 (depends on 1)

The throttling structure according to claim 1, the fluid pressure device further comprising:
a diaphragm chamber that communicates with the introduction chamber through a nozzle; and
a flapper disposed in the diaphragm chamber, the flapper controlling the flow of the pressure fluid introduced from the introduction chamber into the diaphragm chamber via the nozzle, by means of separating and blocking actions of the flapper with respect to the nozzle, wherein the fluid pressure device comprises a pressure reducing valve, in which the pressure fluid supplied from one port is reduced in pressure to a desired pressure and is directed to another port.