JPH04129976U - non-return valve - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a check valve that avoids chattering and prevents leakage and noise. [Structure] A floating valve body 1, a valve seat 2 for the floating valve body 1,
It is composed of a guide 3 that guides the upper part of the floating valve body 1,
The lower part of the floating valve body 1 on the valve seat 2 side is formed to have a small diameter that can be inserted into the inlet pipe line 4, and a cavity 6 is provided between the upper end of the floating valve body 1 on the guide side and the guide 3, so that the floating valve body 1 is formed in a vertical direction. Inlet side pipe 4
A pressure guiding hole 7 is provided to communicate with the cavity 6, and orifices 8, 11 are attached to both ends of the pressure guiding hole 7. [Effect] When there are periodic fluctuations (pressure changes) in the flow, the floating valve body 1 tends to change upward or downward from its average position. At this time, the fluid that has entered the cavity 6 through the pressure guiding hole 7 moves in and out through the pressure guiding hole 7 due to periodic fluctuations in the flow.
However, while the fluctuation is rapid, the flow of fluid in and out is eased by the throttling resistance of the orifices 8 and 11, and the movement of the floating valve body 1 is therefore eased, making it possible to avoid chattering.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This invention relates to a check valve installed in a flow path to prevent backflow of fluid. It is.

0002

[Conventional technology]

Conventionally, the above-mentioned check valve is held by a guide and blocks the flow path on the inlet side with respect to the valve seat. An angle check valve with a conical floating valve body supported by a coiled spring is known. It is being

0003

[Problem that the idea aims to solve]

However, with the conventional check valves mentioned above, chatter occurs when there is pulsating or oscillating flow in the flow path. problems such as damage to the valve seat surface, leaks, and noise. There was a problem. This allows the floating valve body to easily adapt to pressure and flow. This is because it is purified and is sensitive to periodic pressure and flow fluctuations. In such cases, you may need to adjust the installation location of the check valve or increase the weight of the floating valve body. I tried to deal with it, but it didn't work.

0004 This invention solves the above problems, avoids chattering, and prevents leakage and noise. The purpose of this invention is to provide a check valve that prevents noise.

[0005]

[Means to solve the problem]

In order to solve the above problem, the check valve of the present invention includes an idler valve body and a A check valve comprising a valve seat and a guide for holding the floating valve body, the valve seat comprising: The lower part of the body on the valve seat side is formed to have a small diameter that can be inserted into the inlet side conduit, and A cavity is provided between the upper end of the guide side and the guide, and the above-mentioned entry is made in the vertical direction in the floating valve body. A hole communicating between the mouth side conduit and the cavity is provided, and an orifice is provided at at least one end of the hole. It is characterized by the fact that it is equipped with.

[0006]

[Effect]

With the above configuration, under normal flow, the floating valve body is pushed up by the flow. . At this time, the lower part of the floating valve body on the valve seat side allows the lift-up position to be sufficiently adjusted to the valve seat side. away from Then, when the flow stops and begins to flow backwards, the floating valve body will fall under its own weight. lower and occlude. At this time, the lower part of the floating valve body on the valve seat side promotes the fall.

[0007] Also, if there are periodic fluctuations (pressure changes) in the flow, the floating valve body will move up and down from its average position. trying to change to At this time, the fluid that entered the cavity through the hole has a flow period It enters and exits through the hole due to natural fluctuations. However, while the fluctuations are rapid, The flow of fluid in and out is alleviated by the orifice's throttling resistance, which reduces the movement of the floating valve body. chattering is avoided.

[0008]

【Example】

Hereinafter, one embodiment of the present invention will be described based on the drawings. FIG. 1 is a longitudinal cross-sectional view of the check valve of the present invention, and FIG. 2 is an enlarged view of its main parts.

[0009] The check valve includes a floating valve body 1, a valve seat 2 for the floating valve body 1, and an upper part of the floating valve body 1. It is composed of a guide 3 in which a guiding hole 3A is formed, and the floating valve body 1 The lower part of the valve seat 2 side is formed to have a small diameter that can be inserted into the inlet side pipe 4 (hereinafter, this small diameter). The lower part of the floating valve body 1 on the valve seat 2 side formed to have a diameter is referred to as a long nose 1A). said guy The hole 3A has a gap (empty space) between it and the upper end of the floating valve body 1 that has been raised to the lift-up position. The depth is such that a cave 6 can be formed. The floating valve body 1 also has a valve seat 2 facing the valve seat 2. A packing 5 made of fluorocarbon resin is attached to the seal part 1B. A cylindrical hole 1C is formed at the center of the tip of the nose 1A. This hole A screw 1D is cut on the inner surface of 1C, and conduction is established from the bottom 1E of this hole 1C to the cavity 6. A pressure guiding hole 7 is provided in the center of the floating valve body 1 in the vertical direction. Also, the bottom of hole 1C An orifice 8 and a cone-shaped strainer 9 are placed in the part 1E in order from the bottom part 1E. , these orifice 8 and strainer 9 have a cylindrical shape that is screwed into the screw 1D of the hole 1C. It is fixed in the hole 1C with a holding fitting (hereinafter referred to as a nut) 10. moreover , an orifice is attached to the center of the upper end of the floating valve body 1 on the guide 3 side with a screw (not shown). 11 is installed.

0010 With the above configuration, in the normal flow where the fluid flows in the direction shown by the arrow in Fig. 1, the idle valve Body 1 is pushed up by the flow. At this time, use long nose 1A. So, the lift-up position is far enough away from the valve seat. The flow stops and reverses Once started, the floating valve body 1 falls under its own weight and closes. At this time, long nose 1A accelerates the fall.

[0011] Also, if there are periodic fluctuations (pressure changes) in the flow, the floating valve body 1 will move upward from the average position. trying to change downwards. At this time, the fluid that entered the cavity 6 through the pressure guiding hole 7 Periodic fluctuations in the flow cause it to move in and out through the pressure guiding hole 7. However, the changes are rapid On the other hand, the flow of fluid in and out is alleviated by the restriction resistance of orifices 8 and 11, Therefore, the movement of the floating valve body 1 is eased, chattering can be avoided, and the leakage is reduced. It is possible to prevent noise and noise. Note that the fit between the guide 3 and the floating valve body 1 must be strict. Therefore, the amount of fluid entering and exiting the cavity 6 from the outer periphery of the floating valve body 1 is small.

0012 Furthermore, even if the fluid contains fine particles, they are removed by the strainer 9 and the orifice It is possible to prevent the openings 8A and 11A of Nos. 8 and 11 from being blocked by fine particles. .

[0013] Furthermore, the lower orifice 8 can be freely replaced with a nut 10, and the It is possible to set the orifice 8 having the opening 8A according to the body and flow velocity characteristics. can.

[0014] Although this invention describes a check valve, the same configuration can also be applied to a safety valve. Ru. At this time, a coil spring is inserted into the cavity 6 to support the floating valve body.

[0015]

[Effect of the idea]

As described above, according to the present invention, there is a cavity between the guide side upper end of the floating valve body and the guide. A hole is provided in the center of the floating valve body to connect the inlet pipe and the cavity in the vertical direction. By installing an orifice at at least one end of the hole, periodic changes in the flow are introduced. When there is a movement (pressure change), fluid flows in and out through the orifice. It is relieved by the resistance, and therefore the movement of the floating valve body is alleviated and chattering is avoided. leakage and noise can be prevented.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view of a check valve of the present invention.

FIG. 2 is an enlarged view of the main part of FIG. 1;

[Explanation of symbols]

1 Idle valve body 1A long nose 2 Valve seat 3 Guide 4 Inlet pipe line 5 Packing 6 Gap (cavity) 7 Pressure hole 8,11 Orifice 9 Strainer 10 Holding bracket (nut)

Claims (1)

[Scope of utility model registration request] 1. A check valve comprising a floating valve body, a valve seat for the floating valve body, and a guide for holding the floating valve body, wherein a lower part of the floating valve body on the valve seat side is connected to an inlet side pipe. A cavity is formed between the guide-side upper end of the floating valve body and the guide, and a hole is provided in the floating valve body to communicate the inlet-side conduit and the cavity in the vertical direction. , a check valve characterized in that an orifice is attached to at least one end of the hole.