JPH04351378A - Control valve - Google Patents

Abstract

PURPOSE:To reduce the fluid power in a control valve which is to control the rate of flow. CONSTITUTION:A control valve according to the invention comprises a valve hole 1a as a passage for the fluid, a valve element 4 having a flange 4d which receives a jet in the valve hole, and a recess 1c provided at the periphery of the valve hole 1a in such a way as confronting the flange 4d. The fluid power remains small even though the valve element 4 has shifted, and accuracy in pressure balance is secured high.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control valve for regulating flow rate.

0002

2. Description of the Related Art Conventionally, there has been a control valve of this type as shown in FIG. In FIG. 4, the inlet passage 2 of the valve body 1
There is a valve body 4 in the valve port 1a between the and the outflow passage 3, and the valve body 4 has a poppet valve part 4a and a piston part 4b,
The fluid pressure is balanced by the communication path 4c. The valve body 4 has a spring 5 acting on it to adjust the flow rate. Further, the valve body 4 is provided with a flange portion 4d in order to correct the force (fluid force) generated by the fluid passing through the poppet valve portion 4a.

0003

However, with the above configuration, the fluid force acting on the valve body becomes large. Figure 5 shows the relationship between the fluid force (the force that closes the valve in the positive direction) and the position of the valve body.
As the distance increases, the fluid force increases as shown in characteristic A. This is because, as shown in FIG. 4, the jet flow passing through the valve body 4 does not partially collide with the flange portion 4d. For this reason, it is conceivable to provide the flange portion 4d close to the valve port 1a as shown in FIG. occurs, resulting in a characteristic like characteristic B in FIG.

The present invention is intended to solve these conventional problems, and its purpose is to reduce the influence of fluid force, maintain pressure balance, and perform stable flow control.

[0005]

[Means for Solving the Problems] The control valve of the present invention includes a valve port through which fluid passes, a valve body having a flange portion that receives jet flow from the valve port, and a valve body having a valve body having a flange portion on the outer periphery of the valve port facing the flange portion. It is equipped with a recessed portion provided with a cylindrical shape.

[0006]

[Operation] With the above configuration, the fluid passing through the valve body collides with the flange to compensate for the fluid force, and even when the valve body approaches the valve opening, the fluid passes through the recess to compensate for the fluid force. reduce

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows a control valve of the present invention, and parts that are the same as those of the conventional example shown in FIG. 4 are given the same reference numerals and detailed explanations are omitted. In the present invention, an annular recess 1c is provided around the valve port 1a. The flange portion 4d is provided in advance close to the outlet portion 1b of the valve port 1a, and the flange portion 4d is provided close to the outlet portion 1b of the valve port 1a.
Even if the jet is away from the outlet part 1b, all of the jet flows to the flange part 4.
collides with d. In addition, as shown in FIG. 2, the poppet valve portion 4a
When the jet approaches the outlet portion 1b, the jet that collides with the flange portion 4d also flows into the recess portion 1c, and the flow velocity in this portion does not become so large. As a result, the fluid force is small as shown in characteristic C of FIG. Furthermore, if the concave portion 1c is cut diagonally as shown in FIG. 3, the flow will be smoother and the fluid force will be even smaller.

[0008]

As described above, the control valve of the present invention includes a valve port through which fluid passes, a valve body having a flange portion that receives a jet on the outflow side of the valve port, and a flange portion on the outer periphery of the valve port. Since the valve body is provided with a concave portion provided opposite to the valve body, even if the position of the valve body changes, the fluid force is small and the pressure balance is maintained with high precision.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a control valve in a first embodiment of the present invention.

[Figure 2] Cross-sectional view showing the operating state of the control valve

FIG. 3 is a sectional view of a control valve in a second embodiment of the present invention.

[Figure 4] Cross-sectional view of a conventional control valve

[Fig. 5] Fluid force characteristic diagram of the present invention and the conventional control valve

[Figure 6
】Cross-sectional view showing the operating state of a conventional control valve

[Explanation of symbols]

1a Valve hole 1c Recessed part 4 Valve body 4d Flange part

Claims (1)

[Claims] Claim 1: A valve body comprising: a valve port through which fluid passes; a valve body having a flange portion that receives a jet flow from the valve port; and a recess provided on an outer peripheral portion of the valve port opposite to the flange portion. control valve.