Fluid control valve

Patent metadata

Field	Value
Publication number	US-10030677-B2
Application number	US-201414913602-A
Country	US
Kind code	B2
Filing date	Aug 21, 2014
Priority date	Sep 2, 2013
Publication date	Jul 24, 2018
Grant date	Jul 24, 2018

Abstract

Inside a valve housing equipped with a first flow path and a second flow path that connect in parallel with a first port and a second port, there are provided a needle valve body that opens/closes a throttle hole in the first flow path, a check valve that opens/closes the second flow path, and a piston that performs an open/close control of the needle valve body through the interaction of the pressure of a fluid introduced into a pressure chamber and the spring force of a compression spring. The needle valve body is formed at the tip of a rod coupled to the piston. Inside the rod and the needle valve body there is formed a conduction hole connecting the throttle hole and the pressure chamber.

First claim

The invention claimed is:

1. A fluid control valve comprising:
inside a valve housing that includes a first port through which a pressure fluid is input and a second port through which the pressure fluid is output, a first flow path and a second flow path that connect in parallel with the first port and the second port, a needle valve unit that can open and close the first flow path, a check valve unit that can open and close the second flow path, and an open/close control unit that performs an open and close control of the needle valve unit, wherein
the needle valve unit, the open/close control unit, and the check valve unit are disposed coaxially along one axis;
the needle valve unit includes a throttle hole that forms a part of the first flow path and a needle valve body that can open and close the throttle hole, and the needle valve body is formed on a distal end of a rod that extends linearly along the one axis and is freely displaceable along a direction of the one axis together with the rod;
the check valve unit is configured so as to stop flow of the fluid from the first port toward the second port and permit flow of the fluid from the second port toward the first port;
the open/close control unit includes a piston provided on the rod, a pressure chamber formed at a side of the piston, and a compression spring for setting an operating pressure of the piston which is provided at another side of the piston; and
a conduction hole that connects the throttle hole and the pressure chamber is formed inside the rod and the needle valve body, an end of the conduction hole has an opening in a distal end of the needle valve body, and another end of the conduction hole communicates with the pressure chamber.

2. The fluid control valve according to claim 1 , wherein, while fluid pressure in the second port is lower than a set pressure set by the compression spring, the needle valve body stays at an initial position at which the throttle hole is restrictedly opened and when the fluid pressure in the second port becomes higher than the set pressure set by the compression spring, the needle valve body is displaced together with the piston and the rod so as to fully open or fully close the throttle hole.

3. The fluid control valve according to claim 1 , wherein, in the valve housing, there is formed a partition wall that divides the needle valve unit and the open/close control unit, the rod air-tightly and freely slidably extends through the partition wall with a seal member interposed, the needle valve body is formed integrally with a portion of the rod which is at a distal end side of the seal member, and the piston is provided on a portion of the rod which is at a rear end side of the seal member.

4. The fluid control valve according to claim 3 , wherein a diameter of a sliding portion of the rod which air-tightly slides inside the partition wall is larger than a diameter of the needle valve body.

5. The fluid control valve according to claim 1 , further comprising an opening degree adjustment mechanism for adjusting an initial degree of opening of the throttle hole defined by the needle valve body.

6. The fluid control valve according to claim 5 , wherein the opening degree adjustment mechanism is formed by connecting the rod and the piston by screw coupling so as to be relatively displaceable in the directions of the axis and the needle valve body is displaced to adjust the initial degree of opening by positional adjustment of the rod relative to the piston.

7. The fluid control valve according to claim 5 , wherein the opening degree adjustment mechanism includes a handle for rotationally operating the rod and a cam mechanism that displaces the rod in the directions of the axis due to rotation of the rod.

8. The fluid control valve according to claim 7 , wherein the cam mechanism includes a spiral cam surface formed on the valve housing so as to surround the rod and a moving piece that is formed on the rod and that contacts the cam surface, and the cam mechanism is configured so that as the moving piece is moved along the cam surface by rotationally operating the rod via the handle, the rod and the needle valve body are displaced in the directions of the axis to adjust the initial degree of opening.

9. The fluid control valve according to claim 5 , wherein the opening degree adjustment mechanism includes an adjustment rod connected to the rod and an adjustment member that is configured to move the adjustment rod forward and backward, the adjustment member is screw-coupled to the valve housing so as to be freely movable forward and backward, and the opening degree adjustment mechanism is configured so that as the rod is moved forward and backward via the adjustment rod by operating the adjustment member, the needle valve body is moved forward and backward to adjust the initial degree of opening.

10. The fluid control valve according to claim 1 , wherein the open/close control unit is configured so that the piston is urged by the compression spring in such a direction that the needle valve body is closed and so that, by fluid pressure introduced in the pressure chamber, the piston is pressurized in such a direction that the needle valve body is opened.

11. The fluid control valve according to claim 1 , wherein the open/close control unit is configured so that the piston is urged by the compression spring in such a direction that the needle valve body is opened and so that, by fluid pressure introduced in the pressure chamber, the piston is pressurized in such a direction that the needle valve body is closed.

Assignees

• Smc Corp

Inventors

• Shishido Kenji

Classifications

• F15B2211/8855

  Compressible fluids, e.g. specific to pneumatics · CPC title

• Y10T137/7781

  With separate connected fluid reactor surface · CPC title

• F15B11/0413 Primary

  in one direction only, with no control in the reverse direction, e.g. check valve in parallel with a throttle valve · CPC title

• F16K15/00

  Check valves (valves specially adapted for inflatable balls A63B41/00) · CPC title

• F15B13/0401

  Valve members; Fluid interconnections therefor · CPC title