JPH04111966U - flow regulating valve - Google Patents

Abstract

(57) [Summary] [Purpose] To prevent the fluid, which has been constricted by flow rate adjustment and becomes high-speed, from directly hitting the sealing member made of an elastic material for closing the valve seat. [Structure] An enlarged diameter hole 2 is cut at the upper end of the inner periphery of the valve seat 1. A tapered fitting part 6 formed on the lower surface of the valve body 4
A protruding stepped portion 7 is formed at the bottom portion of the protruding step portion 7, which fits into the enlarged diameter hole 2 with a certain gap therebetween. When adjusting the flow rate, the protruding step portion 7 fits into the enlarged diameter hole 2, thereby forming an outflow channel bent in a stepped manner. The throttled fluid is decelerated by passing through the curved flow path, and high pressure that causes wear and the like is prevented from acting on the sealing surface of the sealing member 8.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This invention advances and retreats a tapered fitting part provided on the valve body into the valve seat to create a gap between the two. Regarding flow rate adjustment valves that adjust the fluid flow rate by changing the This prevents the high-speed fluid from directly hitting the sealing member for closing the valve seat provided on the valve body. The present invention relates to a flow rate regulating valve in which the structure of the outflow passage is improved to avoid such problems.

0002

[Conventional technology]

The conventional structure of this type of flow regulating valve will be explained with reference to FIG. Communicates with fluid inlet Above the cylindrical valve seat a, there is a tapered main body c that approaches and separates from the valve seat a. A valve body b projecting through a fitting part d is attached to the tip of a valve rod e that is driven up and down. Compatible. Then, the fitting part d of the valve body b advances and retreats into the valve seat a and engages the inner periphery of the valve seat a. By changing the distance between the fitting part d and the outer periphery, the flow rate from the outlet can be adjusted. In addition, an annular seal member f made of an elastic material is fitted onto the lower surface of the main body c of the valve body b. is pressed against the upper surface of valve seat a to close the valve.

0003

[Problem that the idea aims to solve]

By the way, such conventional flow rate regulating valves are throttled by flow rate adjustment to achieve high speed. The structure is such that the dripping fluid hits the seal member f directly from the front, as shown by the arrow in the figure. Therefore, the sealing surface of the sealing member f is easily roughened due to abrasion due to fluid pressure, etc. , the sealing member f loses its elasticity and sag if it is a high-temperature fluid such as steam. Because of this, the sealing function may fail early, causing fluid leakage or There was a drawback that the sealing member f had to be replaced frequently in order to avoid this.

0004

[Means to solve the problem]

As a means to solve the above problems, the flow rate regulating valve of the present invention is designed to The inner periphery of the valve seat and the hem of the fitting part of the valve body should be aligned so that the outflow flow path of the body becomes a curved flow path. It has a structure in which concave portions and convex portions are formed on the outer periphery.

[0005]

[Function and effect of the idea]

The present invention has the above configuration, and the fluid that has been throttled by the flow rate adjustment passes through the curved flow path. During this time, the flow velocity of the fluid is reduced due to the resistance of the flow path. , high fluid pressure acting on the seal member is avoided.

[0006] This prevents the seal surface of the seal member from becoming rough due to wear, etc., and prevents the seal surface from becoming rough due to wear etc. It has the effect of reliably fulfilling its sealing function over a long period of time.

[0007]

【Example】

An embodiment of the present invention will be described below with reference to FIG.

[0008] In this embodiment, the enlarged diameter hole 2 is cut over a certain dimension at the upper end of the inner peripheral surface of the valve seat 1. On the other hand, the hem of the tapered fitting part 6 formed on the lower surface of the main body part 5 of the valve body 4 A protruding stepped portion 7 is formed in the portion to fit into the enlarged diameter hole 2 with a certain gap. It is. An elastic material such as synthetic resin or rubber is used around the base of the protruding step 7. A ring-shaped sealing member 8 consisting of the following is fitted.

[0009] Then, the fitting part 6 of the valve body 4 advances and retreats within the valve seat 1 due to the vertical movement of the valve rod 9, and is fitted By changing the distance between the outer periphery of the portion 6 and the stepped portion 2a on the inner periphery of the valve seat 1. The outflow flow rate is adjusted, and the seal member 9 is pressed against the upper surface of the valve seat 1 to close the valve. However, during flow rate adjustment, the protruding step 7 of the valve body 4 touches the valve seat, as shown in the figure. By fitting into the enlarged diameter hole 2 on the inner circumference of 1, an outflow passage bent in a stepped manner is formed. It will be done.

0010 Therefore, the squeezed fluid flows through the curved channel as shown by the arrow. During this time, the flow rate of the fluid is reduced due to the resistance of the flow path, and the seal Even if fluid hits the sealing surface of the seal member 8 from the front, it will not be subject to high fluid pressure. There isn't. This prevents the sealing surface from becoming rough due to wear or the like.

[0011] FIG. 2 shows another embodiment, in which the inner peripheral surface of the valve seat 11 is expanded in two stages toward the upper end. The rough enlarged diameter holes 12 and 13 are cut to form a thin upper end of the valve seat 11, and the upper end of the valve seat 11 is formed into a thin wall. The sealing member 18 that is pressed against and closed off has a correspondingly narrow shape. Thus, it is fitted onto the outer circumferential side of the main body portion 15 of the valve body 14.

0012 According to this embodiment, the squeezed fluid flows to the hem of the insertion part 16 as shown by the arrow. A bent portion is formed between the protruding step portion 17 formed in the portion and the enlarged diameter holes 12 and 13. In addition to reducing the flow velocity by passing through the flow path, the shank of the main body 15 of the valve body 14 Once it hits the unfitted inner circumference of the seal member 18, the seal member 18 Since the fluid flows out parallel to the sealing surface, the fluid pressure acting on the sealing surface is smaller.

[0013] In addition, in this embodiment, the sealing surface of the sealing member 18 during flow rate control is The minimum distance x between the upper surface of the valve seat 11 and the inner peripheral surface of the lower enlarged diameter hole 12 and the valve body 14 If the distance between the protruding step portion 17 and the outer circumferential surface is set to be larger than y, the seal will be secured. The fluid pressure increases due to the fluid being throttled again at the lower surface of the sealing surface of the member 18. This prevents

[0014] FIG. 3 shows still another embodiment, in which a hole is provided at the root portion of the protruding step portion 17 of the valve body 14a. A relief groove 20 is drilled, and as shown by the arrow, the squeezed fluid flows through the relief groove. 20 and then flows out, making the outflow path more complicated and further reducing the flow velocity. be done.

[Brief explanation of drawings]

FIG. 1 is a sectional view of an embodiment of the present invention.

FIG. 2 is a partially enlarged sectional view of another embodiment.

FIG. 3 is a partially enlarged sectional view of still another embodiment.

FIG. 4 is a sectional view of a conventional example.

[Explanation of symbols]

1, 11: Valve seat 2, 12, 13: Expanded diameter hole 4, 14,
14a: Valve body 6, 16: Fitting portion 7, 17: Projecting stepped portion 8, 18: Seal member 20: Escape groove

Claims (1)

[Scope of utility model registration request] Claim 1: A tapered fitting part provided on a valve body is moved forward and backward into a cylindrical valve seat communicating with a fluid inflow side, and the distance between the outer periphery of the fitting part and the inner periphery of the valve seat is determined. In the flow rate regulating valve, the flow rate on the outflow side is adjusted by changing the flow rate, and a sealing member made of an elastic material attached around the hem of the fitting part of the valve body is pressed against the valve seat to close the valve, A concave portion and a convex portion are formed on the inner periphery of the valve seat and the outer periphery of the bottom portion of the fitting portion of the valve body so that the outlet flow path of the throttled fluid becomes a bent flow path. flow rate adjustment valve.