Device, pressure pipe and method for reducing water pressure on outer wall of pressure steel pipe

Abstract

The present invention discloses a device, a pressure pipe and a method for reducing the water pressure on the outer wall of a pressure steel pipe, comprising a valve body, an annular rib is arranged in the valve body, the annular rib divides the valve body into a liquid inlet end and a liquid outlet end, a one-way flow limiting device is also arranged in the valve body, the one-way flow limiting device runs through the annular rib, an elastic connector is connected between one end of the one-way flow limiting device and the annular rib, the elastic connector is located in the liquid inlet end of the valve body; when the valve body is in a closed state, the other end of the one-way flow limiting device is in sealing contact with the annular rib. The present invention arranges a valve body on the pressure steel pipe, flows the water outside the pressure steel pipe into the inside of the pressure steel pipe, reduces the water pressure outside the pressure steel pipe, thereby balancing the pressure inside and outside the pressure steel pipe, achieving the effect of protecting the pressure steel pipe body and increasing the service life of the pressure steel pipe.

Description

Technical Field

[0001] The invention belongs to the technical field of water conservancy engineering, and in particular to a device, a pressure pipeline and a method for reducing the water pressure on the outer wall of a pressure steel pipe. Background Art

[0002] At present, in the construction of underground pressure steel pipes in water conservancy projects, due to large water leakage, there is a large water pressure between the outer wall of the pressure steel pipe and the outer concrete, which can easily destroy the structure of the pressure steel pipe itself and cause deformation and damage to the pressure steel pipe body. In order to prevent this from happening, most construction parties choose to bury pre-buried pipes on the outer wall of the pressure steel pipe for drainage, and divert the groundwater pressure through the pre-buried pipes to reduce the pressure on the outer wall of the pressure steel pipe. However, the pre-buried pipes need to be buried for a long time, which is costly, and there is a risk of damage or deformation of the pre-buried pipes when burying them. At the same time, the pre-buried pipes not only have high maintenance costs but also have the problem of difficult maintenance. Therefore, it is urgently necessary to invent a new device for alleviating the water pressure on the outer wall of the pressure steel pipe, which is used to solve the problem of imbalance of pressure inside and outside the pressure steel pipe, thereby protecting the pressure steel pipe body. Summary of the invention

[0003] In order to solve the problems existing in the prior art, the present invention provides a device for reducing the water pressure on the outer wall of a pressure steel pipe, thereby solving the problem in the prior art that the underground pressure steel pipe body of a water conservancy project is easily deformed and damaged by water pressure.

[0004] To achieve the above-mentioned purpose, the present invention provides the following technical solution: a device for reducing the water pressure on the outer wall of a pressure steel pipe, characterized in that it comprises a valve body, wherein an annular rib is arranged in the valve body, wherein the annular rib divides the valve body into a liquid inlet end and a liquid outlet end, wherein a one-way flow limiting device is also arranged in the valve body, wherein the one-way flow limiting device penetrates the annular rib, wherein the two ends of the one-way flow limiting device are divided into a front cover and a rear cover, wherein the front cover is arranged at the liquid inlet end of the valve body, wherein the rear cover is arranged at the liquid outlet end of the valve body, wherein an elastic connector is connected between the front cover and the annular rib;

[0005] When the elastic connecting piece is in a natural state, the rear cover is in sealing contact with the annular rib;

[0006] When the elastic connecting member is in a compressed state, the rear cover is not in contact with the annular rib.

[0007] Furthermore, the one-way flow limiting device also includes a valve, the front cover and the rear cover are respectively arranged at both ends of the valve, the valve passes through the annular rib, and the diameters of the front cover and the rear cover are both larger than the inner diameter of the annular rib.

[0008] Furthermore, the end surface of the front cover is annularly hollow, a honeycomb surface, or the end surface of the front cover close to the annular rib is provided with a support body, and the end surface of the rear cover is solid.

[0009] Furthermore, a liquid inlet hole is opened on the pipe of the pressure steel pipe, the liquid inlet end of the valve body is connected to the liquid inlet hole through a thread, and the liquid outlet end of the valve body faces the inner wall of the pipe of the pressure steel pipe.

[0010] Furthermore, a liquid inlet hole is provided on the pipe of the pressure steel pipe, and a reinforcement plate is provided on the outer wall of the pipe of the pressure steel pipe. A threaded hole is provided on the reinforcement plate, and the central axis of the threaded hole coincides with the central axis of the liquid inlet hole. The reinforcement plate is connected to the liquid inlet end of the valve body by threads, and the liquid outlet end of the valve body faces the inner wall of the pipe of the pressure steel pipe.

[0011] Furthermore, the rear cover is in sealing contact with the annular rib via a sealing ring.

[0012] Furthermore, the elastic connecting member is a compression spring.

[0013] Furthermore, a sealing gasket is provided between the valve body and the reinforcement plate.

[0014] The present invention also provides a pressure pipeline for reducing the water pressure on the outer wall of a pressure steel pipe, comprising a pressure steel pipe, a liquid inlet hole is provided on the pipe of the pressure steel pipe, a reinforcement plate is provided on the outer wall of the pipe of the pressure steel pipe, a threaded hole is provided on the reinforcement plate, the central axis of the threaded hole coincides with the central axis of the liquid inlet hole, the valve body is detachably mounted on the reinforcement plate and the pressure steel pipe, and the liquid outlet end of the valve body faces the inner wall of the pressure steel pipe.

[0015] The present invention also provides a method for reducing the water pressure on the outer wall of a pressure steel pipe, comprising the following steps: a liquid inlet hole is opened on the outer wall of the pressure steel pipe, a valve body is installed on the liquid inlet hole, and a liquid outlet end of the valve body is installed on the liquid inlet hole of the pressure steel pipe; when the water pressure on the outer wall of the pressure steel pipe increases, the water pressure pushes the front cover to move, and the front cover compresses the elastic connecting piece while pushing the rear cover to move, the rear cover moves away from the annular rib, the valve body is opened, and the water on the outer wall of the pressure steel pipe passes through the valve body and enters the pressure steel pipe; when the water pressure on the outer wall of the pressure steel pipe decreases, the elastic connecting piece is reset, the elastic connecting piece pushes the front cover to move and drives the rear cover to move, the rear cover is in sealing contact with the annular rib, the valve body is closed, and the valve body stops discharging the water outside the pressure steel pipe into the pressure steel pipe.

[0016] Compared with the prior art, the present invention has at least the following beneficial effects:

[0017] The present invention provides a device for reducing the water pressure on the outer wall of a pressure steel pipe, which solves the problem that in the current construction of underground pressure steel pipes in water conservancy projects, there is large water leakage, and there is a large water pressure between the outer wall of the pressure steel pipe and the outer concrete, which easily destroys the structure of the pressure steel pipe itself and causes damage to the appearance of the pressure steel pipe body. When the water pressure outside the pressure steel pipe is high, the present invention uses an elastic connector, a one-way flow limiting device and annular ribs to make the water flow outside the pressure steel pipe flow into the inside of the pressure steel pipe, thereby reducing the water pressure outside the pressure steel pipe, thereby balancing the pressure inside and outside the pressure steel pipe, protecting the pressure steel pipe body, and increasing the service life of the pressure steel pipe. At the same time, it is ensured that the fluid in the pressure steel pipe will not flow out of the outside of the pressure steel pipe through the valve body to cause a reduction in the internal pressure of the pressure steel pipe. The present invention only needs to open a liquid inlet hole on the pipeline of the pressure steel pipe to install the valve body. If the valve body is damaged, the valve body can be replaced, which is more convenient for maintenance and reduces the maintenance cost of the pressure steel pipe, making it more economical.

[0018] Furthermore, in the present invention, the end face of the front cover is hollow annular, a honeycomb face, or the end face of the front cover close to the annular rib is provided with a support body, and the end face of the rear cover is solid, which ensures that the water flow outside the pressure steel pipe enters the interior of the pressure steel pipe and at the same time ensures that when the water pressure outside the pressure steel pipe is too high, after the elastic connecting piece is damaged, the water flow outside the pressure steel pipe continues to enter the pressure steel pipe, and the valve body continues to reduce the water pressure outside the pressure steel pipe, thereby reducing the damage of the water pressure outside the pressure steel pipe to the pressure steel pipe, providing maintenance personnel with time to replace the valve body. In addition, the end face of the front cover in the present invention is divided into different situations, which can cope with different water pressures on the outer wall of the pressure steel pipe. The present invention has higher flexibility and a wider range of applicable water pressures.

[0019] Furthermore, the outer wall of the pressure pipe of the present invention is provided with a reinforcement plate, which enhances the stress-bearing strength of the pressure steel pipe. At the same time, the valve body cooperates with the reinforcement plate to increase the installation firmness of the valve body and also enhance the sealing performance between the valve body and the pressure steel pipe.

[0020] Furthermore, in the present invention, the rear cover is in sealing contact with the annular rib via a sealing ring, thereby ensuring the sealing of the valve body. In addition, a sealing gasket is provided between the valve body and the reinforcement plate, thereby converting the rigid contact between the valve body and the reinforcement plate into a flexible contact, thereby reducing the friction loss between the valve body and the reinforcement plate and increasing the service life of the valve body.

[0021] Furthermore, the liquid inlet hole in the present invention is also used for grouting. After the grouting is completed, the valve body is installed, and the valve body acts as a grouting plug, thereby reducing the number of grouting plugs and reducing the cost of the pressure pipeline.

[0022] The present invention also provides a pressure pipe for reducing the water pressure on the outer wall of a pressure steel pipe. The pressure pipe of the present invention is composed of a pressure pipe, a reinforcement plate and a valve body. Not only is the strength of the overall pressure steel pipe higher, but it can also effectively reduce the water pressure on the outer wall of the pressure steel pipe. It has a longer service life, a wider range of applicable sites, low cost, and is suitable for industrialization.

[0023] The present invention also provides a method for reducing the water pressure on the outer wall of a pressure steel pipe. When the water pressure outside the pressure steel pipe increases, the water on the outer wall of the pressure steel pipe is allowed to flow through the valve body installed on the outer wall of the pressure steel pipe and enter the pressure steel pipe, thereby reducing the water pressure on the outer wall of the pressure steel pipe and balancing the water pressure inside and outside the pressure steel pipe. The method for reducing the water pressure on the outer wall of a pressure steel pipe provided by the present invention has lower cost, is more convenient to maintain, and takes shorter maintenance time. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0025] Figure 2 It is a front view structural schematic diagram of the present invention;

[0026] Figure 3 for Figure 2 Middle AA section view;

[0027] Figure 4 This is a partial cross-sectional view of the valve body after installation;

[0028] In the attached drawings: 1-valve body, 2-pin hole, 3-front cover, 4-elastic connector, 5-valve, 6-sealing ring, 7-rear cover, 8-embedded groove, 9-annular rib, 10-sealing gasket, 11-reinforcement plate, 12-pressure steel pipe. DETAILED DESCRIPTION

[0029] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0030] like Figure 1 and Figure 3As shown, the present invention provides a device for reducing the water pressure on the outer wall of a pressure steel pipe, comprising a valve body 1, wherein an annular rib body, namely an annular rib 9, is arranged in the valve body 1, wherein the annular rib 9 is integrally formed with the valve body 1, and the annular rib 9 divides the valve body 1 into a liquid inlet end and a liquid outlet end, and a one-way flow limiting device is also arranged in the valve body 1, wherein the one-way flow limiting device passes through the annular rib 9, and an elastic connecting member 4 is connected between one end of the one-way flow limiting device and the annular rib 9, and the elastic connecting member 4 is located in the liquid inlet end of the valve body 1; when the valve body 1 is in a closed state, namely the elastic connecting member 4 is in a natural state, the rear cover 7 is in sealing contact with the annular rib 9; preferably, the rear cover 7 is in sealing contact with the annular rib 9 through a sealing ring 6, and preferably, the sealing ring 6 is made of polytetrafluoroethylene material to ensure the sealing of the valve body 1; when the valve body 1 is in an open state, namely the elastic connecting member 4 is in a compressed state, the rear cover 7 is not in contact with the annular rib 9;

[0031] Specifically, a liquid inlet hole is opened on the pressure steel pipe 12, and the liquid outlet end of the valve body 1 is connected to the pressure steel pipe 12 through the liquid inlet hole of the pressure steel pipe 12. When the water pressure outside the pressure steel pipe 12 is too high, the water flow outside the pressure steel pipe 12 acts on the valve body 1, the valve body 1 opens, and the water flow outside the pressure steel pipe 12 passes through the valve body 1 and enters the pressure steel pipe 12, thereby reducing the water pressure outside the pressure steel pipe 12 and reducing the damage of the water flow outside the pressure steel pipe 12 to the pressure steel pipe 12 itself.

[0032] In a preferred embodiment of this embodiment, the one-way flow limiting device includes a valve 5 and an end cover, the end cover includes a front cover 3 and a rear cover 7, the valve 5 passes through the annular rib 9, the front cover 3 and the rear cover 7 are respectively arranged at both ends of the valve 5, the front cover 3 is arranged at the liquid inlet end of the valve body 1, and the rear cover 7 is arranged at the liquid outlet end of the valve body 1, wherein the diameters of the front cover 3 and the rear cover 7 are both larger than the inner diameter of the annular rib 9;

[0033] like Figure 3 As shown, in this embodiment, the end face of the front cover 3 is annular and hollow, and the end face of the rear cover 7 is solid; a sealing ring 6 is provided between the rear cover 7 and the annular rib 9, wherein the sealing ring 6 is provided on the end face of the rear cover 7, and an elastic connector 4 is provided between the front cover 3 and the annular rib 9, preferably, the elastic connector 4 is a compression spring, wherein the spring adopts a corrosion-resistant spring with a maximum pressure bearing of 50Kpa, in the initial state, the rear cover 7 is in close contact with the annular rib 9 through the sealing ring 6, and the spring is in a normal state, when the fluid enters the valve body 1, the fluid presses the front cover 3, the front cover 3 does work on the compression spring, and the rear cover 7 moves away from the annular rib 9, the valve body 1 is in an open state, and the fluid flows out of the valve body 1 through the annular rib 9;

[0034] In one embodiment of the present invention, the end surface of the front cover 3 is a honeycomb surface, and the end surface of the rear cover 7 is solid;

[0035] In another embodiment of the present invention, the end surface of the front cover 3 is solid, a support body is provided on the end surface of the front cover close to the annular rib, and the end surface of the rear cover 7 is solid;

[0036] Specifically, when the water pressure on the outer wall of the pressure steel pipe is too large and the compression spring is damaged, the valve body can remain connected and continue to reduce the pressure on the pressure steel pipe, thereby reducing the damage of the water pressure on the outer wall of the pressure steel pipe to the pressure steel pipe and increasing the maintenance time for maintenance personnel. The maintenance personnel only need to replace the damaged spring. At the same time, the end face of the front cover is in different shapes, according to the order of the annular hollow force point being smaller than the honeycomb surface and smaller than the solid surface, so as to cope with different water pressures on the outer wall of the pressure steel pipe, and corresponding selection can be made according to actual construction conditions.

[0037] In one embodiment of the present embodiment, a threaded screw is provided on the outside of the valve body 1. During the manufacturing process of the pressure steel pipe 12, a liquid inlet hole is opened on the pipe of the pressure steel pipe 12, and a screw matching the threaded screw of the valve body 1 is provided on the inner wall of the liquid inlet hole. In the present embodiment, the threaded screw of the valve body 1 is provided at the liquid inlet end of the valve body 1. The valve body 1 is screwed into the liquid inlet hole of the pressure steel pipe 12 through the threaded screw from the inner wall of the pressure steel pipe 12. The liquid inlet end of the valve body 1 penetrates the pipe of the pressure steel pipe 12, and the liquid outlet end of the valve body 1 faces the inside of the pressure pipe 12.

[0038] In another embodiment of this embodiment, if Figure 4 As shown, a reinforcing plate 11 is welded to the outer wall of the pressure steel pipe 12, and a threaded hole is opened on the reinforcing plate 11. The central axis of the threaded hole is aligned with the central axis of the valve body 1. The liquid inlet hole of the pressure steel pipe 12 is not provided with a threaded thread. The outer surface of the liquid outlet end of the valve body 1 is a smooth surface. The threaded thread of the valve body 1 is arranged at the liquid inlet end of the valve body 1. The valve body 1 is screwed into the threaded hole of the reinforcing plate 11 from the inner wall of the pressure steel pipe 12 through the threaded thread. The liquid outlet end of the valve body 1 is engaged with the liquid inlet hole of the pressure steel pipe 12. Preferably, a sealing gasket 10 is arranged between the valve body 1 and the reinforcing plate 11 to reduce the friction between the valve body 1 and the reinforcing plate 11 and extend the service life of the valve body 1.

[0039] In this embodiment, if Figure 2 As shown, a pin hole is opened on the end face of the valve body 1. The corresponding installation tool is inserted into the pin hole 2, and the valve body 1 is screwed into the pressure steel pipe 12 or into the reinforcement plate 11 on the inner wall of the pressure steel pipe 12, with the liquid outlet end of the valve body 1 facing the pressure steel pipe 12.

[0040] Specifically, the number of liquid inlet holes opened in the pressure steel pipe can be adjusted according to actual needs.

[0041] Preferably, the valve body 1 in this embodiment is made of 316 stainless steel with a maximum pressure resistance of 15 MPa.

[0042] The specific installation steps and operation method of the present invention are as follows:

[0043] A plurality of liquid inlet holes are provided on the pipe of the pressure steel pipe 12, and the liquid inlet holes penetrate the pressure steel pipe 12; a reinforcing plate 11 is welded on the outer wall of the pipe of the pressure steel pipe 12, and a threaded hole is provided on the reinforcing plate 11, and the central axis of the threaded hole is aligned with the axis of the liquid inlet hole; the valve body 1 is screwed into the reinforcing plate 11 through the threaded thread, and the liquid inlet end of the valve body 1 is engaged with the liquid inlet hole of the pressure steel pipe 12, and the pressure steel pipe 12 is installed; wherein, before installing the valve body 1, the threaded thread of the liquid inlet hole of the pressure steel pipe 12 is first cleaned, and if the threaded thread is damaged, it needs to be repaired first; during installation, it is necessary to apply anti-loosening thread agent on the threaded thread of the valve body 1 and the threaded thread of the reinforcing plate 11 to ensure that the valve body 1 and the pressure steel pipe 12 are firmly installed, insert the installation tool into the pin hole 2 of the valve body 1, and screw the valve body 1 into the pressure steel pipe 12;

[0044] After the valve body 1 is installed, if the water pressure at the liquid inlet end of the valve body 1 increases, the water pressure compresses the spring in the valve body 1, the one-way flow limiting device is displaced, the front cover 3 is displaced to compress the spring, and the rear cover 7 moves away from the annular rib 9. The valve body 1 is in an open state, and water flows through the valve body 1. The greater the pressure of the water flow, the greater the compression of the spring, the greater the distance between the rear cover 7 and the annular rib 9, and thus the greater the water flow. If the pressure exceeds the maximum pressure-bearing capacity of the spring, the spring is damaged and fails, and the valve body 1 can be replaced.

[0045] In addition, the present invention also provides a pressure pipe for reducing the water pressure on the outer wall of a pressure steel pipe. The device for reducing the water pressure on the outer wall of a pressure steel pipe comprises a pressure steel pipe, a liquid inlet hole is provided on the pipe of the pressure steel pipe, a reinforcement plate is provided on the outer wall of the pipe of the pressure steel pipe, a threaded hole is provided on the reinforcement plate, the central axis of the threaded hole coincides with the central axis of the liquid inlet hole, the valve body is detachably mounted on the reinforcement plate and the pressure steel pipe, the liquid outlet end of the valve body faces the inner wall of the pressure steel pipe, and the pressure pipe provided by the present invention has higher strength and can withstand greater water pressure.

[0046] In addition, this valve body 1 has another function equivalent to a grouting plug. After grouting is completed through the liquid inlet hole of the pressure steel pipe 12, the valve body 1 is installed, thereby reducing the number of grouting plugs, which is more economical and practical. During grouting, a sleeve needs to be screwed into the liquid inlet hole to protect the threaded buckle of the liquid inlet hole. After the grouting is completed, the sleeve is unscrewed and screwed into the valve body 1.

[0047] Finally, it should be noted that the above-described embodiments are only specific implementations of the present invention, which are used to illustrate the technical solutions of the present invention, rather than to limit them. The protection scope of the present invention is not limited thereto. Although the present invention is described in detail with reference to the above-described embodiments, ordinary technicians in the field should understand that any technician familiar with the technical field can still modify the technical solutions recorded in the above-described embodiments within the technical scope disclosed by the present invention, or can easily think of changes, or make equivalent replacements for some of the technical features therein; and these modifications, changes or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be based on the protection scope described in the claims.

Claims

1. A device for reducing the water pressure on the outer wall of a pressure steel pipe, characterized in that: The valve body (1) comprises a valve body (1), wherein an annular rib (9) is arranged inside the valve body (1), wherein the annular rib (9) divides the valve body (1) into a liquid inlet end and a liquid outlet end, wherein a one-way flow limiting device is also arranged inside the valve body (1), wherein the one-way flow limiting device passes through the annular rib (9), wherein two ends of the one-way flow limiting device are divided into a front cover (3) and a rear cover (7), wherein the front cover (3) is located at the liquid inlet end of the valve body (1), and the rear cover (7) is located at the liquid outlet end of the valve body (1), and an elastic connecting piece (4) is connected between the front cover (3) and the annular rib (9); When the elastic connecting member (4) is in a natural state, the rear cover (7) is in sealing contact with the annular rib (9); When the elastic connecting member (4) is in a compressed state, the rear cover (7) is not in contact with the annular rib (9); The one-way flow limiting device further comprises a valve (5), the front cover (3) and the rear cover (7) being respectively arranged at two ends of the valve (5), the valve (5) passing through the annular rib (9), the diameters of the front cover (3) and the rear cover (7) being both larger than the inner diameter of the annular rib (9); the end surface of the front cover (3) being annularly hollow, a honeycomb surface or the end surface of the front cover (3) close to the annular rib (9) being provided with a support body, and the end surface of the rear cover (7) being solid; The pressure steel pipe (12) is provided with a liquid inlet hole, the outer wall of the pressure steel pipe (12) is provided with a reinforcing plate (11), the reinforcing plate (11) is provided with a threaded hole, the central axis of the threaded hole coincides with the central axis of the liquid inlet hole, the reinforcing plate (11) is connected to the liquid inlet end of the valve body (1) by means of threads, and the liquid outlet end of the valve body (1) faces the inner wall of the pressure steel pipe (12); a sealing gasket (10) is provided between the valve body (1) and the reinforcing plate (11).

2. The device for reducing water pressure on the outer wall of a pressure steel pipe according to claim 1, characterized in that: The pressure steel pipe (12) is provided with a liquid inlet hole, the liquid inlet end of the valve body (1) is connected to the liquid inlet hole via a thread, and the liquid outlet end of the valve body (1) faces the inner wall of the pressure steel pipe (12).

3. The device for reducing water pressure on the outer wall of a pressure steel pipe according to claim 1, characterized in that: The rear cover is in sealing contact with the annular rib (9) via a sealing ring (6).

4. The device for reducing water pressure on the outer wall of a pressure steel pipe according to claim 1, characterized in that: The elastic connecting member (4) is a compression spring.

5. A pressure pipeline, characterized in that: The device for reducing the water pressure on the outer wall of a pressure steel pipe according to any one of claims 1 to 4 comprises a pressure steel pipe (12), a liquid inlet hole is provided on the pipe of the pressure steel pipe (12), a reinforcing plate (11) is provided on the outer wall of the pipe of the pressure steel pipe (12), a threaded hole is provided on the reinforcing plate (11), the central axis of the threaded hole coincides with the central axis of the liquid inlet hole, the valve body (1) is detachably mounted on the reinforcing plate (11) and the pressure steel pipe (12), and the liquid outlet end of the valve body (1) faces the inner wall of the pressure steel pipe (12).

6. A method for reducing the water pressure on the outer wall of a pressure steel pipe of a pressure pipeline according to claim 5, characterized in that: The following steps are involved: A liquid inlet hole is provided on the outer wall of the pressure steel pipe (12), and a valve body (1) is installed on the liquid inlet hole. The liquid outlet end of the valve body (1) is installed on the liquid inlet hole of the pressure steel pipe (12). When the water pressure on the outer wall of the pressure steel pipe (12) increases, the water pressure pushes the front cover to move. The front cover compresses the elastic connector and pushes the rear cover to move. The rear cover moves away from the annular rib, and the valve body (1) is opened. The water on the outer wall of the pressure steel pipe (12) passes through the valve body (1) and enters the pressure steel pipe (12). When the water pressure on the outer wall of the pressure steel pipe (12) decreases, the elastic connector is reset. The elastic connector pushes the front cover to move and drives the rear cover to move. The rear cover is in sealing contact with the annular rib, and the valve body (1) is closed. The valve body (1) stops discharging the water outside the pressure steel pipe (12) into the pressure steel pipe (12).

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