# US 11,028,943 B2 · Control butterfly valve

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- Number: US 11,028,943 B2
- Document ID: US11028943B2
- Status: Granted
- Kind: B2
- Application number: 16/377,596
- Filed: 2019-04-08
- Published: 2019-10-17
- Granted: 2021-06-08
- Earliest claimed: 2018-04-12
- Applicants: P&K ENG Co., Ltd.
- Inventors: Yong Taek Park; Myoung Joon Kwon
- Web page: https://patentgrep.com/patent/US11028943B2

## CPC

- F16K 47/045: {and the closure member being rotatable}
- F16K 47/08: for decreasing pressure {or noise level} and having a throttling member separate from the closure member {, e.g. screens, slots, labyrinths}
- F16K 1/22: with axis of rotation crossing the valve member, e.g. butterfly valves
- F16K 1/222: {Shaping of the valve member}
- 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)}

## Abstract

A control butterfly valve comprises a valve body having a fluid passage through which a fluid flows, a valve disc controlling an opening and closing of the fluid passage of the valve body, and a diffuser including a passing hole configured to allow the fluid, which passes through the valve disc, to pass therethrough and a passing part configured to allow the fluid, which passes through the valve disc at a low speed, to pass therethrough.

## Claims

### Claim 1

A control butterfly valve, comprising:
a valve body having a fluid passage through which a fluid flows;
a valve disc controlling an opening and closing of the fluid passage of the valve body; and
a diffuser including:
a passing hole 10% to 30% smaller in cross-sectional area than the fluid passage and configured to allow the fluid, which passes through the valve disc, to pass therethrough; and
a passing part configured to allow the fluid, which passes through the valve disc at a low speed, to pass therethrough, wherein the passing part is formed in a lower part of the diffuser to face a first lower part of the valve disc, wherein the passing part has a plurality of holes smaller in size than the passing hole and through which the fluid passes, wherein eddy producing parts are formed, in the same direction as one another, in first upper part and a second lower part of the valve disc to create an eddy of the fluid, and wherein an inclined cutoff part is formed in second upper part of the valve disc.

### Claim 2 (depends on 1)

The control butterfly valve of claim 1, further comprising a sheet formed on an inner circumferential surface of the valve body to seal off the valve disc, wherein the inclined cutoff part is formed in a predetermined length in the second upper part of the valve disc which faces a ceiling surface of the sheet.