Flow control valve

Patent metadata

Field	Value
Publication number	US-12486925-B2
Application number	US-202218561011-A
Country	US
Kind code	B2
Filing date	May 9, 2022
Priority date	May 17, 2021
Publication date	Dec 2, 2025
Grant date	Dec 2, 2025

Abstract

A flow control valve includes a valve body ( 21 ), the valve body ( 21 ) having a valve seat part ( 211 ) provided therein, with a valve port ( 112 ) formed in the valve seat part ( 211 ); a spool ( 12 ), the spool ( 12 ) being axially movable to open or close the valve port ( 112 ), with a pressure-equalizing channel ( 121 ) provided in the spool ( 12 ), the pressure-equalizing channel connecting the valve port ( 112 ) and a back-pressure chamber ( 14 ), wherein the spool ( 12 ) has a substantially cylindrical lower end ( 222 ), and a conical hole ( 223 ) is formed in the spool ( 12 ), the conical hole ( 223 ) forming part of the pressure-equalizing channel ( 121 ), a bottom end of the conical hole ( 223 ) being located on a bottom plane ( 224 ) of the lower end ( 222 ), and the ratio of the diameter of the bottom end of the conical hole ( 223 ) to the diameter of the lower end ( 222 ) being greater than 0.88. In the present application, the conical hole ( 223 ) is provided on the spool ( 12 ) of the flow control valve, the conical hole ( 223 ) forming part of the pressure-equalizing channel ( 121 ), with the bottom end of the conical hole ( 223 ) being located on the bottom plane ( 224 ) of the lower end ( 222 ) of the spool ( 12 ). The conical hole ( 223 ) is dimensioned so that the pressure distributed at a lower part of the spool ( 12 ) becomes uniform, so as to balance fluid pressures in the back-pressure chamber ( 14 ) and the valve port ( 112 ).

First claim

What is claimed is:

1 . A flow control valve, comprising:
a valve body having a valve seat part provided therein, with a valve port formed in the valve seat part; a spool which is axially movable to open or close the valve port, with a pressure-equalizing channel provided in the spool, the pressure-equalizing channel connecting the valve port and a back-pressure chamber, wherein the spool has a substantially cylindrical lower end, and a conical hole is formed in the spool, the conical hole forming part of the pressure-equalizing channel, a bottom end of the conical hole being located on a bottom plane of the lower end, and the ratio of the diameter of the bottom end of the conical hole to the diameter of the lower end being greater than 0.88.

2 . The flow control valve as claimed in claim 1 , wherein the cone angle of the conical hole is 40°-120°.

3 . The flow control valve as claimed in claim 2 , wherein there is metal-to-metal hard sealing between the spool and the valve seat part.

4 . The flow control valve as claimed in claim 1 , wherein the ratio of the diameter of the bottom end of the conical hole to the diameter of the lower end is 0.89-0.97.

5 . The flow control valve as claimed in claim 4 , wherein there is metal-to-metal hard sealing between the spool and the valve seat part.

6 . The flow control valve as claimed in claim 1 , wherein the ratio of the diameter of the bottom end of the conical hole to the diameter of the lower end is 0.92-0.96.

7 . The flow control valve as claimed in claim 6 , wherein there is metal-to-metal hard sealing between the spool and the valve seat part.

8 . The flow control valve as claimed in claim 1 , wherein a guide hole is provided in the valve body, a guide part guided by the guide hole is provided on the spool, a sealing member is provided on either the guide hole or the guide part, and the diameter of the guide part is equal to the diameter of the lower end.

9 . The flow control valve as claimed in claim 8 , wherein there is metal-to-metal hard sealing between the spool and the valve seat part.

10 . The flow control valve as claimed in claim 1 , wherein the lower end further comprises a transitional rounded corner located between an outer cylindrical face of the lower end and the bottom plane of the lower end, the transitional rounded corner contacting the valve seat part to close the valve port.

11 . The flow control valve as claimed in claim 10 , wherein there is metal-to-metal hard sealing between the spool and the valve seat part.

12 . The flow control valve as claimed in claim 10 , wherein one end of the transitional rounded corner is tangential to the outer cylindrical face of the lower end, and another end of the transitional rounded corner is tangential to the bottom plane of the lower end.

13 . The flow control valve as claimed in claim 12 , wherein there is metal-to-metal hard sealing between the spool and the valve seat part.

14 . The flow control valve as claimed in claim 1 , wherein the valve seat part comprises a cylindrical valve port, a first conical part, a second conical part and a third conical part which are connected in sequence and have gradually increasing diameters, wherein the first conical part forms a seating face of the spool, and the angle between the second conical part and the axis of the valve port is smaller than the angle between the third conical part and the axis of the valve port, so as to provide different circulation areas at different degrees of opening of the spool.

15 . The flow control valve as claimed in claim 14 , wherein there is metal-to-metal hard sealing between the spool and the valve seat part.

16 . The flow control valve as claimed in claim 1 , wherein there is metal-to-metal hard sealing between the spool and the valve seat part.

17 . The flow control valve as claimed in claim 1 , wherein a connecting part is further provided between the pressure-equalizing channel and the conical hole, the connecting part being cylindrical and/or conical.

Assignees

• Danfoss As

Inventors

• Bao Jinfeng
• Wu Jiang
• Pedersen Anders

Classifications

• F16K1/42

  Valve seats (for double-seat valves F16K1/44) · CPC title

• F16K1/38

  of conical shape · CPC title

• F16K31/06

  using a magnet {, e.g. diaphragm valves, cutting off by means of a liquid} · CPC title

• F16K31/04

  using a motor · CPC title

• F16K39/02

  for lift valves · CPC title