Valve seat sealing structure for ball valve

Abstract

The utility model relates to the field of ball valves, and particularly discloses a valve seat sealing structure for a ball valve. The valve seat sealing structure for the ball valve comprises a valve body, a ball body installed in the valve body, a valve rod installed at the upper end of the valve body, valve seats installed on the two sides of the ball body and a valve deck fixedly installed at one end of the valve body, a positioning groove used for allowing one valve seat to be inserted is formed in the inner wall of one end of the ball body, and the outer sides of the two valve seats are each provided with two installation grooves. The inner wall of each installation groove is connected with a sealing ring, a sealing groove is formed in the side, close to the ball body, of each valve seat, a sealing gasket connected with the ball body is installed on the inner wall of each sealing groove, a limiting groove used for allowing the other valve seat to be inserted in is formed in the inner wall of one side of the valve deck, and one end of the valve body is fixedly connected with a plurality of fasteners used for fixing the valve deck. The damage risk caused by too high pressure or uneven stress of the sealing piece can be effectively reduced, so that the sealing performance and reliability of the ball valve are improved, and the service life of the sealing piece is prolonged.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of ball valves, in particular to a valve seat sealing structure for ball valves. BACKGROUND

[0002] Ball valves are widely used in industrial fields, mainly composed of a ball, a valve seat, a valve stem, a valve body and the like, which are simple in structure, convenient to operate and good in sealing performance. The valve seat plays a crucial role in the ball valve, which is directly related to the sealing performance of the ball valve, and also affects the service life, operating performance and safety of the valve.

[0003] In the prior art, the valve seat of the ball valve may be damaged due to friction or operation errors during use or replacement, which affects the sealing performance of the valve seat and the normal use of the ball valve. CONTENT OF THE UTILITY MODEL

[0004] In order to ensure the sealing performance of the valve seat and improve the service life of the ball valve, the present application provides a valve seat sealing structure for ball valves.

[0005] The valve seat sealing structure for ball valves provided by the present application adopts the following technical scheme:

[0006] A valve seat sealing structure for ball valves, comprising a valve body, a ball installed inside the valve body, a valve stem installed on the upper end of the valve body, a valve seat installed on both sides of the ball, and a valve cover fixedly installed on one end of the valve body, wherein one end of the ball has a positioning groove for inserting one of the valve seats, the outer side of each valve seat has two installation grooves, the inner wall of each installation groove is connected with a sealing ring, the side of each valve seat close to the ball has a sealing groove, the inner wall of each sealing groove is installed with a sealing gasket connected with the ball, the inner wall of one side of the valve cover has a limiting groove for inserting the other valve seat, and one end of the valve body is fixedly connected with a plurality of fasteners for fixing the valve cover.

[0007] By adopting the above technical scheme, firstly, the valve seat can be better positioned and fixed on both sides of the ball, and the sealing performance of the valve seat can be effectively improved by the sealing ring and the sealing gasket; secondly, the use of fasteners ensures the tight connection between the valve cover and the valve body, which can enhance the sealing performance and stability of the structure as a whole, ensure the normal operation of the ball valve, and improve the practicality and service life of the ball valve.

[0008] Optionally, the inner wall of each valve seat is provided with two pressure relief channels, and the outer wall of each valve seat is provided with a pressure relief groove communicating with the two pressure relief channels.

[0009] By adopting the technical scheme, additional pressure relief paths can be provided for the fluid inside the ball valve, when the pressure inside the ball valve is too high, part of the fluid can be discharged through the pressure relief channel and the pressure relief groove, thereby reducing the pressure difference on both sides of the valve seat, helping to reduce the stress on the valve seat sealing element in a high pressure environment, reducing the risk of damage to the sealing element due to excessive pressure, prolonging the service life of the sealing element, and improving the safety and reliability of the ball valve under high pressure working conditions.

[0010] Optionally, the side of each valve seat away from the ball is provided with a plurality of notches, the inner wall of each notch is provided with a spring, one end of the plurality of springs is connected with the inner wall of one side of the positioning groove, and the other end of the plurality of springs is connected with the inner wall of one side of the limiting groove.

[0011] By adopting the technical scheme, when the ball rotates or is subjected to external force during use of the ball valve, the spring can absorb part of the impact force and vibration, reduce the rigid collision between the valve seat and the valve body, the ball and the valve cover, and reduce the possibility of damage to the sealing element due to friction or operation errors. The spring can also automatically adjust the position of the valve seat to a certain extent, so that the valve seat always maintains good contact with the ball, further improving the sealing performance.

[0012] Optionally, one end of each valve seat is fixedly connected with a limiting ring, and the positioning groove and the limiting groove are provided with a groove for inserting the limiting ring.

[0013] By adopting the technical scheme, a reliable limiting effect can be provided for the valve seat, which can effectively prevent the valve seat from moving excessively in the axial direction after the limiting ring is inserted into the groove, ensuring that the valve seat always maintains a stable position during use. This helps to avoid uneven stress or excessive compression of the sealing element due to position deviation of the valve seat, thereby reducing the risk of damage to the sealing element and ensuring the sealing performance and normal operation of the ball valve.

[0014] Optionally, one end of the valve cover is fixedly connected with a sealing ring connected with the inner wall of the valve body.

[0015] By adopting the technical scheme, the presence of the sealing ring can effectively prevent fluid from leaking from the connection between the valve cover and the valve body, improving the overall sealing reliability of the ball valve. Even under high pressure or harsh working conditions, the sealing ring can still play a good sealing role, preventing leakage due to poor sealing at the connection between the valve cover and the valve body, ensuring the normal operation of the ball valve. At the same time, it also provides a more stable internal environment for the valve seat sealing element, indirectly improving the service life of the valve seat sealing element.

[0016] Optionally, a clamping groove is formed in one side of the valve body, a gasket is connected to the inner wall of the clamping groove, and a clamping ring is fixedly connected to one side of the valve cover and connected to the gasket.

[0017] By adopting the technical scheme, the gasket can effectively fill the gap between the clamping groove and the valve cover, prevent fluid from leaking therefrom, and further improve the sealing system of the ball valve; and the connection of the clamping ring and the sealing gasket can more firmly fix the sealing gasket between the valve seat and the valve cover, avoid displacement or falling of the sealing gasket in the use process due to vibration or fluid impact, thereby ensuring that the sealing gasket is always in a good sealing state, and improving the sealing performance and reliability of the ball valve.

[0018] Optionally, one side of each of the valve seats is provided with a pressure relief member, one end of one of the pressure relief members is fixedly connected with the valve body, and one end of the other pressure relief member is fixedly connected with the valve cover.

[0019] By adopting the technical scheme, when abnormal pressure rise occurs in the use process of the ball valve, the pressure relief member can quickly respond and timely release the excess pressure, thereby protecting the valve seat sealing member from high pressure impact, reducing the risk of damage to the sealing member caused by excessively high pressure, and improving the safety and stability of the ball valve under high pressure working conditions, and prolonging the service life of the ball valve.

[0020] Optionally, the two ends of the ball body are provided with insertion grooves, one inner wall of one of the insertion grooves is connected with one end of the valve rod, and the inner wall of the other insertion groove is connected with a positioning pin fixedly installed at the lower end of the valve body.

[0021] By adopting the technical scheme, the ball body can be more accurately positioned and fixed inside the valve body, the connection of the valve rod and the insertion groove can ensure the stability of the ball body during rotation, and ensure that the ball body can rotate according to the predetermined trajectory, thereby realizing the normal opening and closing operation of the ball valve; and the connection of the positioning pin and the insertion groove can prevent the ball body from being axially displaced due to external force, avoid abnormal stress or damage to the valve seat sealing member caused by the displacement of the ball body, and thereby improve the operation stability and sealing reliability of the ball valve.

[0022] In summary, the present application has the following beneficial effects:

[0023] 1. The present application can not only effectively reduce the risk of damage caused by excessively high pressure or uneven stress on the sealing member, but also ensure the stability of the sealing member in the use process, thereby improving the sealing performance and reliability of the ball valve and prolonging the service life of the sealing member.

[0024] 2. The present application can not only enhance the stability of the overall structure of the ball valve, but also effectively reduce the pressure difference on both sides of the valve seat, prevent damage to the sealing member or the valve body caused by high pressure impact, thereby improving the safety and stability of the ball valve under high pressure working conditions and ensuring the normal operation of the ball valve. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 is a structural schematic view of the valve body and the valve seat of an embodiment of the present application

[0026] Figure 2 is a structural schematic diagram of a ball valve of an embodiment of the present application;

[0027] Figure 3 is a structural schematic diagram of a valve body and a valve cover of an embodiment of the present application;

[0028] Figure 4 is Figure 3 is a sectional view along line A-A;

[0029] Figure 5 is Figure 4 is an enlarged schematic diagram of region B in FIG. 6.

[0030] BRIEF DESCRIPTION OF THE DRAWINGS: 1. valve body; 11. positioning groove; 12. clamping groove; 13. gasket; 2. ball; 21. insertion groove; 3. valve stem; 4. valve seat; 41. mounting groove; 42. sealing ring; 43. sealing groove; 44. sealing gasket; 45. pressure relief passage; 46. pressure relief groove; 47. notch; 48. spring; 49. limiting ring; 5. valve cover; 51. limiting groove; 52. sealing ring; 53. clamping ring; 6. fastener; 7. recess; 8. pressure relief member; 9. positioning pin. DETAILED DESCRIPTION

[0031] The following will be described in detail below with reference to the accompanying drawings. Figures 1-5 The present application will be described in further detail.

[0032] An embodiment of the present application discloses a valve seat sealing structure for a ball valve.

[0033] With reference to Figure 1 , the valve seat sealing structure for a ball valve comprises a valve body 1, a valve stem 3, a ball 2, two valve seats 4, and a valve cover 5. The ball 2 is rotatably installed on the inner wall of the valve body 1. The valve stem 3 is rotatably installed on the upper end inner wall of the valve body 1 and connected with the ball 2 at the lower end. The upper end of the valve stem 3 is fixedly connected with a valve knob. The valve knob is used to rotate the valve stem 3 to drive the ball 2 to rotate, thereby completing the opening or closing of the ball valve. The two valve seats 4 are installed on both sides of the ball 2. One of the valve seats 4 is installed on the inner wall of the valve body 1, and the other valve seat 4 is installed on the inner wall of the valve cover 5. One end of the valve body 1 is threadedly connected with a plurality of fasteners 6 that are threadedly connected with the valve cover 5. The plurality of fasteners 6 are used to ensure the stability of the connection between the valve cover 5 and the valve body 1. When the valve body 1 and the valve cover 5 are fixedly connected, the two valve seats 4 are limited at both ends of the ball 2. The valve seats 4 are used to ensure the sealing performance of the ball valve. The lower end of the valve body 1 is fixedly installed with a positioning pin 9 used to limit the lower end of the ball 2.

[0034] With reference to Figure 2 , Figure 3 and Figure 4The valve body 1 has a positioning groove 11 on the inner wall of the end opposite to the valve cover 5 for mounting one of the valve seats 4. The valve cover 5 has a limiting groove 51 on the inner wall of the end closest to the valve body 1 for mounting the other valve seat 4. Each valve seat 4 has two mounting grooves 41 on its outer side. Each mounting groove 41 has a sealing ring 42 fitted onto its inner wall, which connects to the inner walls of the limiting groove 51 and the positioning groove 11, respectively. The mounting groove 41 restricts the position of the sealing ring 42, preventing it from falling off. When installing the valve seat 4, pushing it into the positioning groove 11 or the limiting groove 51 causes the sealing ring 42 to roll along the inner wall of the mounting groove 41. Compared to sliding friction, rolling friction has a lower coefficient of friction, reducing the friction between the sealing ring 42 and the inner wall of the mounting groove 41. This prevents deformation or damage to the sealing ring 42 due to excessive local pressure, thus extending its service life.

[0035] refer to Figure 2 , Figure 3 and Figure 4 Both valve seats 4 are fixedly connected to the side opposite to the ball 2 with limit rings 49, and the limit groove 51 and the positioning groove 11 are both provided with grooves 7 for the limit rings 49 to be inserted. The connection between the limit rings 49 and the grooves 7 is used to limit the range of movement of the valve seats 4 in the axial and radial directions, so as to ensure the sealing performance and stability of the ball valve.

[0036] refer to Figure 4 The ball 2 has slots 21 at both ends. One slot 21 is for the lower end of the valve stem 3 to be inserted, allowing the valve stem 3 to rotate the ball 2, thus opening and closing the valve. The other slot 21 is for the upper end of the locating pin 9 to be inserted. The locating pin 9 ensures that the ball 2 is in the correct position during assembly, improving the overall assembly accuracy and sealing performance of the valve. This structure ensures a reliable connection between the ball 2 and the valve stem 3, and also enhances the stability of the ball 2 through the locating pin 9.

[0037] refer to Figure 3 , Figure 4 Each of the two valve seats 4 has multiple slots 47 on the side near the limiting ring 49. A spring 48 is installed between the inner wall of each slot 47 and the inner wall of the limiting groove 51 or the mounting groove 41. When the valve stem 3 is rotated to drive the ball 2 to rotate, it will push the two valve seats 4 to move and cause the spring 48 to contract or extend. This can press the valve seat 4 tightly onto the ball 2, ensuring sufficient contact pressure between the sealing surfaces, thereby maintaining stable sealing performance.

[0038] refer to Figure 3 , Figure 4Both valve seats 4 have a sealing groove 43 on the side opposite to the groove 47. The inner wall of the sealing groove 43 is fitted with a sealing gasket 44 connected to the ball 2. The sealing gasket 44 is used to prevent leakage of the medium inside the valve. The sealing gasket 44 can undergo elastic or plastic deformation under the action of pre-tightening force, which can compensate for the gap between the valve seat 4 and the ball 2 caused by wear and extend the service life of the valve.

[0039] refer to Figure 3 , Figure 4 and Figure 5 Each valve seat 4 has a pressure relief channel 45 on its inner wall at both ends, and a pressure relief groove 46 communicating with the pressure relief channel 45 on its outer side. The pressure relief groove 46 is located between two mounting grooves 41. The pressure relief channel 45 and pressure relief groove 46 provide an additional pressure relief path for the fluid inside the ball valve. When the pressure inside the ball valve is too high, some fluid can be discharged through the pressure relief channel 45 and pressure relief groove 46, thereby reducing the pressure difference on both sides of the valve seat 4. A pressure relief component 8 communicating with the pressure relief groove 46 is fixedly connected to one side of both the valve body 1 and the valve cover 5. The pressure relief component 8 has a single piston structure inside. When the pressure in the valve cavity reaches a certain multiple, the valve seat 4 can automatically relieve pressure to the flow channel. It can relieve pressure under normal pressure rise and abnormal pressure rise conditions, thereby improving the safety of the valve.

[0040] refer to Figure 3 , Figure 5 A sealing ring 52 is fixedly connected to one end of the valve cover 5, which is connected to the inner wall of the valve body 1. The sealing ring 52 is used to ensure the sealing and ease of connection between the valve cover 5 and the valve body 1. A groove 12 is provided on one side of the valve body 1, and a gasket 13 is installed on the inner wall of the groove 12 to improve the sealing between the structures. A retaining ring 53 is fixedly connected to one side of the valve cover 5. When the valve cover 5 is connected to the valve body 1, the retaining ring 53 is inserted into the inner wall of the groove 12 and one side is in close contact with one side of the gasket 13 to ensure the sealing of the connection between the valve cover 5 and the valve body 1.

[0041] The implementation principle of the valve seat sealing structure for the ball valve in this embodiment is as follows: During assembly, firstly, the sealing ring 42 is fitted inside the mounting groove 41, and then multiple springs 48 are inserted into the groove 47. Next, the sealing gasket 44 is installed into the sealing groove 43. Secondly, one valve seat 4 is inserted into the positioning groove 11 until the limiting ring 49 on one side is in contact with the inner wall of the groove 7, and one side of the multiple springs 48 contacts one side of the positioning groove 11, thus completing the installation of one valve seat 4. Thirdly, the ball 2 is installed inside the valve body 1 until one side of the ball 2 is in contact with the sealing gasket 44 on one side of the valve seat 4. At this time, the positioning pin 9 is inserted into the lower end of the valve body 1 until the upper end of the positioning pin 9 is inserted into the groove 43. Insert the valve stem 3 into the slot 21 at the lower end of the ball 2, and then insert the valve stem 3 into the upper end of the valve seat 4 until the lower end of the valve stem 3 is inserted into the inner wall of the slot 21 at the upper end of the ball 2, thus fixing the ball 2. In the fourth step, insert the other valve seat 4 into the limiting groove 51 on one side of the valve cover 5, and then move the valve cover 5 so that one end of its sealing ring 52 is inserted into the inner wall of one end of the valve body 1, so that the sealing gasket 44 on one side of the other valve seat 4 is in contact with the other side of the ball 2, until one side of the valve cover 5 is completely in contact with the valve body 1. Finally, tighten the multiple fasteners 6 to fix the valve cover 5 to one side of the valve body 1, and then fix the valve knob to the upper end of the valve stem 3 and fix it to the valve body 1, thus completing the assembly of the ball valve.

[0042] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A valve seat sealing structure for a ball valve, comprising a valve body (1), a ball (2) installed inside the valve body (1), a valve stem (3) installed at the upper end of the valve body (1), valve seats (4) installed on both sides of the ball (2), and a valve cover (5) fixedly installed at one end of the valve body (1), characterized in that: The inner wall of one end of the ball (2) is provided with a positioning groove (11) for inserting one of the valve seats (4). Two mounting grooves (41) are provided on the outer sides of the two valve seats (4). A sealing ring (42) is connected to the inner wall of each mounting groove (41). A sealing groove (43) is provided on the side of each valve seat (4) near the ball (2). A sealing gasket (44) connected to the ball (2) is installed on the inner wall of each sealing groove (43). A limiting groove (51) is provided on the inner wall of one side of the valve cover (5) for inserting the other valve seat (4). A plurality of fasteners (6) for fixing the valve cover (5) are fixedly connected to one end of the valve body (1).

2. The valve seat sealing structure for a ball valve according to claim 1, characterized in that: Each valve seat (4) has two pressure relief channels (45) on its inner wall, and each valve seat (4) has a pressure relief groove (46) on its outer wall that communicates with the two pressure relief channels (45).

3. The valve seat sealing structure for a ball valve according to claim 1, characterized in that: Each valve seat (4) has multiple slots (47) on the side away from the ball (2). Each slot (47) has a spring (48) installed on its inner wall. One end of each spring (48) is connected to the inner wall of the positioning groove (11), and the other end of each spring (48) is connected to the inner wall of the limiting groove (51).

4. The valve seat sealing structure for a ball valve according to claim 1, characterized in that: Each valve seat (4) is fixedly connected to a limiting ring (49) at one end. The positioning groove (11) and the limiting groove (51) are both provided with a groove (7) for the limiting ring (49) to be inserted.

5. The valve seat sealing structure for a ball valve according to claim 1, characterized in that: One end of the valve cover (5) is fixedly connected to a sealing ring (52) that is connected to the inner wall of the valve body (1).

6. The valve seat sealing structure for a ball valve according to claim 1, characterized in that: A slot (12) is provided on one side of the valve body (1), and a gasket (13) is connected to the inner wall of the slot (12). A retaining ring (53) connected to the gasket (13) is fixedly connected to one side of the valve cover (5).

7. The valve seat sealing structure for a ball valve according to claim 1, characterized in that: Each of the valve seats (4) is provided with a pressure relief component (8) on one side, one end of one pressure relief component (8) is fixedly connected to the valve body (1), and the other end of the pressure relief component (8) is fixedly connected to the valve cover (5).

8. The valve seat sealing structure for a ball valve according to claim 1, characterized in that: The ball (2) has slots (21) at both ends. The inner wall of one slot (21) is connected to one end of the valve stem (3), and the inner wall of the other slot (21) is connected to a positioning pin (9). The positioning pin (9) is fixedly installed at the lower end of the valve body (1).

Images