JP2002295698A - Valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a valve element 13 from shaking. SOLUTION: The valve element 13 is built in a casing 12 having a valve seat 11 formed therein, the spring force of a spring 16 is applied to the valve element 13, and the valve element 13 closes the valve seat 11 by this spring force. A plurality of guide parts 18 for movably maintaining the valve element, in contact with the valve element, are provided on the casing 12 in the circumferential direction of an inner surface of the casing.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a valve which is most suitable for a check valve which permits the flow of a pressurized fluid in only one direction.

[0002]

2. Description of the Related Art A conventional check valve shown in FIG. 4 incorporates a valve body 3 in a casing 2 in which a valve seat 1 is formed. The valve element 3 places the ball 5 on the holder 4 and applies the spring force of the spring 6 to the holder 4. That is, a spring receiver 7 is provided on the side opposite to the holder 4, and a spring 6 is interposed between the spring receiver 7 and the holder 4.

By applying a spring force to the holder 4 as described above, usually, the ball 5 is moved to the valve seat 1.
It is pressed against and closed. In this state, when a pressure in a direction against the spring force acts on the ball 5, the ball 5 moves against the spring force of the spring 6 and opens the valve seat 1.

When the ball 5 moves and the valve seat 1 is opened, the pressurized fluid passes through the valve seat 1 and flows through a space 8 formed around the valve body 3. When fluid pressure acts in the opposite direction, that is, in the direction of the spring force of the spring 6, the ball 5 comes into pressure contact with the valve seat 1 and blocks the flow of fluid. That is, this check valve allows only the flow of the pressure fluid in the direction against the spring force of the spring 6.

[0005]

In the above-described conventional check valve, the valve body 3 including the holder 4 and the ball 5 is in a very unstable state in the space 8. In particular, when the valve is opened, the valve element 3 fluctuates in the space 8. If the valve body 3 fluctuates in the space 8, it will not return to the valve closing position accurately, but if it does not return to the valve closing position accurately, the valve seat 1 cannot be seated firmly and leakage will occur. .

There is also a relief valve having substantially the same structure as the above-mentioned check valve. In this relief valve, there is also a problem that if the valve element fluctuates, it causes pressure vibration and noise. An object of the present invention is to provide a valve capable of keeping a valve body stable.

[0007]

According to the present invention, a valve element is incorporated into a casing having a valve seat formed thereon, and a spring force of a spring is applied to the valve element. It is assumed that the valve has a configuration in which the valve seat is closed. The first aspect of the present invention, on the premise of the above-described valve, is characterized in that a guide portion that is in contact with the valve body and that movably holds the valve body is provided in the casing. The second invention is characterized in that the valve element is constituted by a ball and a holder for holding the ball, and a guide portion is provided in contact with the ball and the holder.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment shown in FIGS. 1 and 2 relates to a check valve, in which a valve body 13 is incorporated in a casing 12 in which a valve seat 11 is formed.
The valve body 13 places the ball 15 on the holder 14 and causes the spring force of the spring 16 to act on the holder 14. That is, a spring receiver 17 is provided on the side opposite to the holder 14, and the spring receiver 17 and the holder 1 are provided.
4 is interposed between the spring 16 and the spring 16.

A guide portion 18 is formed on the inner surface of the casing 12 as described above.
Are formed of convex portions running in the axial direction, and are formed at equal intervals in the circumferential direction of the inner surface of the casing 12. The guide section 18 as described above contacts the holder 14 and the ball 15 and movably holds them. The space between the guide portions 18 serves as a fluid flow path 19.

Now, the ball 15 moves and the valve seat 1
When 1 is opened, the pressurized fluid flows through the valve seat 11 and the flow path 18 formed around the valve body 13. When a fluid pressure acts in the opposite direction, that is, in the direction of the spring force of the spring 16, the ball 15 comes into pressure contact with the valve seat 11 and blocks the flow of fluid. In other words, this check valve allows only the flow of the pressure fluid in the direction against the spring force of the spring 16 as in the related art.

However, the first embodiment is different from the prior art in that the valve element 1 comprising the holder 14 and the ball 15
3 is always kept stable because it is guided by the guide portion 18. Since the valve element 3 is stably maintained as described above, there is no occurrence of leakage unlike the conventional case.

In the second embodiment shown in FIG. 3, the valve 13 is of a poppet type, and the other configuration is the same as that of the first embodiment. As described above, in the second embodiment, since the valve 13 is of a poppet type, the guide portion 18 comes into contact with only the poppet portion of the valve 13. Therefore, the valve body 13 moves and the valve seat 1
When 1 is opened, the pressurized fluid flows through the valve seat 11 and the flow path 18 formed around the valve body 13. Further, when the fluid pressure acts in the opposite direction, that is, in the direction of the spring force of the spring 16, the valve body 13 comes into pressure contact with the valve seat 11 and blocks the flow of the fluid. That is, the check valve of the second embodiment also allows only the flow of the pressure fluid in the direction against the spring force of the spring 16.

Although four guide portions 18 are provided in the first and second embodiments, two guide portions may be provided as long as the valve body can be stably maintained. However, in practice, providing three or more guide portions can further increase the stability. Although each of the first and second embodiments is a check valve, the present invention is also applicable to a relief valve. When the present invention is applied to a relief valve, an effect that pressure vibration, noise, and the like are not generated is exerted.

[0014]

According to the first and second aspects of the present invention, the valve body is always kept stable, so that the valve seat can be firmly seated and leakage does not occur. Further, when the present invention is applied to a relief valve or the like, since the valve body does not fluctuate, no pressure vibration or sound is generated.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a first embodiment.

FIG. 2 is a horizontal sectional view of the first embodiment.

FIG. 3 is a longitudinal sectional view of a second embodiment.

FIG. 4 is a conventional diagram.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Valve seat 12 Casing 13 Valve body 14 Holder 15 Ball 16 Spring 18 Guide part

 ──────────────────────────────────────────────────続 き Continued on the front page F-term (reference) 3H051 AA01 BB10 CC11 3H058 AA04 BB01 BB34 CB06 CB14 CC02 CD05

Claims (2)

[Claims] 1. A valve body is incorporated into a casing having a valve seat formed thereon, and a spring force of a spring is applied to the valve body. Usually, the valve body closes the valve seat by the action of the spring force. In the valve, the casing is provided with a plurality of guide portions in contact with the valve body and movably holding the valve body in a circumferential direction of an inner surface of the casing. 2. The valve according to claim 1, wherein the valve body comprises a ball and a holder for holding the ball, and a guide portion in contact with the ball and the holder is provided.