Check valve for chemical pipeline

Abstract

The utility model relates to the technical field of check valves, and discloses a check valve used on a chemical pipeline, which comprises a left shell, the right side of the left shell is fixedly connected with a right shell, one side of the left shell close to the inside of the right shell is provided with a valve body, the left side and the right side of the outside of the valve body are fixedly connected with O-shaped sealing rings, and the left side and the right side of the outside of the valve body are fixedly connected with the O-shaped sealing rings. An opening and closing element valve plate is fixedly connected to the right side of the valve body, a limiter is arranged on the right side of the opening and closing element valve plate, butt joint assemblies used for connecting pipelines are arranged on the sides, far away from each other, of the left shell and the right shell, a plurality of first fixing bolts are arranged in the left shell, and each butt joint assembly comprises two butt joint pipelines. The check valve component has the advantages of being light in moving mass, rapid in opening and closing, small in impact force, small in abrasion, long in service life, stable in work, small in pressure pulsation, small in noise during work and the like. And the normal operation service life of the equipment can reach more than 8000 hours.

Description

Technical Field

[0001] The utility model relates to the technical field of check valves, in particular to a check valve for chemical pipelines. Background Art

[0002] A check valve is an automatic valve mainly used to prevent the reverse flow of the medium and ensure that the medium can only flow in one direction. Its opening and closing member is a circular valve flap, which realizes opening and closing through its own weight and the action generated by the medium pressure. According to the movement mode of the valve flap, check valves can be divided into two types: lift check valves and swing check valves. The valve flap of the lift check valve moves along the center line of the valve seat, having a fast closing function but a large fluid resistance. The valve flap of the swing check valve rotates around a fixed axis, is suitable for low flow rate and large diameter pipelines, and has a small fluid resistance. This kind of valve is widely used in the fields of chemical industry, petroleum, electric power, metallurgy, etc., and can effectively prevent equipment damage and production accidents caused by the reverse flow of the medium.

[0003] However, in the use process of some existing check valves, the flow capacity is insufficient. When the flow capacity of the valve is insufficient, it will cause the flow velocity of the fluid passing through the valve to increase, and then generate a greater impact force. This impact force will not only damage the valve structure, but also aggravate the wear inside the valve. As the use time increases, these wears will gradually accumulate, ultimately leading to a decline in the sealing performance of the valve and even failure. In addition, frequent maintenance and replacement not only increase the maintenance cost, but also affect the continuous operation of the system. Therefore, in view of the above deficiencies, a check valve for chemical pipelines is proposed to solve the above problems. Summary of the Utility Model

[0004] In order to make up for the above deficiencies, the utility model provides a check valve for chemical pipelines, aiming to improve the problems of short service life and insufficient flow capacity of some check valves in the prior art.

[0005] In order to achieve the above purpose, the utility model adopts the following technical scheme:

[0006] A check valve for chemical pipelines includes a left housing, a right housing is fixedly connected to the right side of the left housing, a valve body is arranged on the side close to the inside of the left housing and the right housing, O-ring seals are fixedly connected to both the left and right sides of the outside of the valve body, a closing element valve flap is fixedly connected to the right side of the valve body, a restrictor is arranged on the right side of the closing element valve flap, docking components for connecting pipelines are arranged on both sides far from each other of the left housing and the right housing, and a plurality of fixing bolts I are arranged inside the left housing;

[0007] As a further description of the above technical solution:

[0008] The docking assembly includes two docking pipelines. The adjacent sides of the two docking pipelines are respectively fixedly connected to the opposite sides of the left housing and the right housing. Sealing rings are fixedly connected to the adjacent sides of the two docking pipelines, and a plurality of fixing bolts II are arranged inside the two docking pipelines;

[0009] As a further description of the above technical solution:

[0010] The left housing and the right housing are fixedly connected by the fixing bolt I. The left housing and the docking pipeline are fixedly connected by the fixing bolt II, and the right housing and the docking pipeline are fixedly connected by the fixing bolt II;

[0011] As a further description of the above technical solution:

[0012] The materials of the left housing and the right housing are both stainless steel, and the material of the O-ring is nitrile rubber;

[0013] As a further description of the above technical solution:

[0014] The material of the sealing ring is ethylene propylene rubber, and the limiter is used to limit the movement of the valve disc.

[0015] The present utility model has the following beneficial effects:

[0016] In the present utility model, this check valve component has the advantages of light moving mass, rapid opening and closing, small impact force, small wear and long service life, stable operation, small pressure pulsation, and low noise during operation. Usually, the normal operation life of the equipment can reach more than 8000 hours. Since the flow area of the check valve is determined by the valve core component, a larger flow capacity can be obtained compared with traditional check valves, and the equipment operation is more economical. Description of the Drawings

[0017] Figure 1 It is a three-dimensional view of a check valve for chemical pipelines proposed by the present utility model;

[0018] Figure 2 It is a schematic structural diagram of the left housing of a check valve for chemical pipelines proposed by the present utility model;

[0019] Figure 3 It is a schematic structural diagram of the limiter of a check valve for chemical pipelines proposed by the present utility model.

[0020] Legend Explanation:

[0021] 1. Left housing; 2. Right housing; 3. Valve body; 4. O-ring seal; 5. Opening and closing element valve disc; 6. Limiter; 7. First fixing bolt; 8. Docking pipeline; 9. Sealing ring; 10. Second fixing bolt. Detailed implementation manner

[0022] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0023] Refer to Figures 1 to 3 , an embodiment provided by the present invention: A check valve for a chemical pipeline, including a left housing 1, a right housing 2 is fixedly connected to the right side of the left housing 1. The materials of the left housing 1 and the right housing 2 are both stainless steel. The left housing 1 and the right housing 2 are made of stainless steel, ensuring the corrosion resistance and strength of the valve, and being suitable for the chemical environment. The use of stainless steel not only provides the necessary structural stability but also extends the service life of the valve. On the inner sides close to each other of the left housing 1 and the right housing 2, there is a valve body 3. The valve body 3 is the core part of the valve, responsible for controlling the on-off of the fluid. On both the left and right sides of the outside of the valve body 3, there are fixedly connected O-ring seals 4. The material of the O-ring seals 4 is nitrile rubber. The O-ring seals 4 are made of nitrile rubber and have good elasticity and oil resistance. They are fixed on both the left and right sides of the outside of the valve body 3 to play a sealing role and prevent fluid leakage. For the seal between the check valve component and the pipeline flange, flat gasket sealing is used at low pressure, and lens sealing is used at high pressure. The seal between the check valve component and the end face of the valve core uses an O-ring. Self-tightening sealing is more reliable than using a flat gasket seal. A closing element valve disc 5 is fixedly connected to the right side of the valve body 3. The closing element valve disc 5 is a key component for controlling the fluid flow. It is located on the right side of the valve body 3. When the fluid flows through the valve, the valve disc opens or closes as needed to achieve the on-off control of the fluid. A limiter 6 is arranged on the right side of the closing element valve disc 5. The limiter 6 is used to limit the movement of the valve disc. The main function of the limiter 6 is to limit the movement range of the valve disc to ensure that the valve disc will not move excessively or be damaged;

[0024] Refer to Figures 1 to 3, the spool component mainly consists of a valve seat for controlling the air flow, a valve disc 5 as the opening and closing element, and a limiter 6 for restricting the movement of the valve disc. On the far sides of the left housing 1 and the right housing 2, docking components for connecting pipelines are provided. The docking component includes two docking pipelines 8. The near sides of the two docking pipelines 8 are respectively fixedly connected to the far sides of the left housing 1 and the right housing 2. Sealing rings 9 are fixedly connected to the near sides of the two docking pipelines 8. The sealing ring 9 is made of ethylene propylene rubber. Using ethylene propylene rubber for the sealing ring 9 further enhances the sealing performance of the valve. Inside each of the two docking pipelines 8, a plurality of second fixing bolts 10 are provided. The left housing 1 and the docking pipeline 8 are fixedly connected through the second fixing bolts 10, and the right housing 2 and the docking pipeline 8 are fixedly connected through the second fixing bolts 10. By using a plurality of second fixing bolts 10, the stable connection between various parts of the valve and the firmness of the overall structure are ensured. Inside the left housing 1, a plurality of first fixing bolts 7 are provided. The left housing 1 and the right housing 2 are fixedly connected through the first fixing bolts 7. The fixed connection between the left housing 1 and the right housing 2 is achieved by using the first fixing bolts 7.

[0025] Working principle: When the fluid pressure in the pipeline is higher than the pressure at the other end of the valve, the fluid pushes the opening and closing element, the valve disc 5, to open it, allowing the fluid to pass through. The design of the opening and closing element, the valve disc 5, enables it to open flexibly according to the pressure change of the fluid, thus realizing the smooth flow of the fluid. At this time, the limiter 6 does not play a role because it is mainly used to restrict the movement of the valve disc in the case of reverse flow. Under normal circumstances, the O-ring seal 4 ensures the sealing between the valve body 3 and the left housing 1 and the right housing 2, preventing fluid leakage. At the same time, the sealing ring 9 in the docking component enhances the sealing performance at the connection between the valve and the pipeline, ensuring that the fluid does not leak at the interface. When the fluid stops flowing or the pressure at the other end of the pipeline increases, the opening and closing element, the valve disc 5, will close to prevent the reverse flow of the fluid;

[0026] The limiter 6 ensures that the opening and closing element, the valve disc 5, will not be damaged due to excessive movement during the closing process, and at the same time protects the pipeline system from the influence of water hammer effect. Under high pressure conditions, the sealing between the check valve component and the pipeline flange adopts lens seal, while at low pressure, flat gasket seal is used. These are all to ensure good sealing performance under different operating conditions. The self-tightening sealing method is more reliable than the traditional flat gasket seal because it can better adapt to pressure changes and temperature fluctuations. The check valve component has the characteristics of light moving mass, rapid opening and closing, small impact force, small wear, long service life, stable operation, small pressure pulsation, and low noise during operation. Usually, the normal operating life of the equipment can reach more than 8000 hours. Since the flow area of the check valve is determined by the spool component, a larger flow capacity can be obtained compared with traditional check valves, and the equipment operation is more economical.

[0027] Finally, it should be noted that the above are only the preferred embodiments of the present utility model and are not used to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A check valve for a chemical pipeline, comprising a left housing (1), characterized in that: The right side of the left shell (1) is fixedly connected to the right shell (2); a valve body (3) is arranged on the side close to the inside of the left shell (1) and the right shell (2); O-rings (4) are fixedly connected to the left and right sides of the outside of the valve body (3); an opening and closing element valve plate (5) is fixedly connected to the right side of the valve body (3); a limiter (6) is arranged on the right side of the opening and closing element valve plate (5); a docking assembly for connecting pipelines is arranged on the far side of the left shell (1) and the right shell (2); and a plurality of fixing bolts (7) are arranged inside the left shell (1).

2. A check valve for chemical pipeline according to claim 1, characterized in that: The docking assembly comprises two docking pipes (8), the adjacent sides of the two docking pipes (8) are respectively fixedly connected to the distant sides of the left shell (1) and the right shell (2), the adjacent sides of the two docking pipes (8) are fixedly connected with sealing rings (9), and the interiors of the two docking pipes (8) are provided with a plurality of fixing bolts (10).

3. A check valve for chemical pipeline according to claim 2, characterized in that: The left housing (1) and the right housing (2) are fixedly connected via the first fixing bolt (7), the left housing (1) and the connecting pipe (8) are fixedly connected via the second fixing bolt (10), and the right housing (2) and the connecting pipe (8) are fixedly connected via the second fixing bolt (10).

4. The check valve for chemical pipeline according to claim 1, characterized in that: The left housing (1) and the right housing (2) are both made of stainless steel, and the O-ring (4) is made of nitrile rubber.

5. The check valve for chemical pipeline according to claim 2, characterized in that: The sealing ring (9) is made of ethylene propylene rubber, and the limiter (6) is used to limit the movement of the valve plate.

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