A seal-stable V-ball valve

Abstract

This utility model discloses a V-type ball valve with stable sealing. The key technical points of the solution are: a valve body, a ball positioned inside the valve body, and a valve seat that can form a hard seal with the ball. The outer wall of the valve seat is provided with a sealing ring groove with its opening facing the valve body opening. It also includes a sealing component located in the sealing ring groove and forming a soft seal with the inner wall of the valve body, a spring seat for pressing the sealing component and coaxially arranged with the valve seat, several pre-tightening bolts that are circumferentially distributed around the axis of the spring seat and pass through the spring seat and connected to the valve seat, a valve seat cover fixedly connected to the valve body, and several sealing springs that are circumferentially distributed around the axis of the spring seat and limited between the valve seat cover and the spring seat. By rotating the pre-tightening bolts relative to the spring seat, the sealing component undergoes corresponding elastic deformation, which solves the problem of unstable sealing and easy leakage in the prior art.

Description

Technical Field

[0001] This utility model relates to the field of V-type ball valve technology, and more specifically to a V-type ball valve with stable sealing. Background Technology

[0002] A ball valve is a type of valve in which the ball is driven by the valve stem and rotates around the valve axis. Valves are control components in fluid transport systems and have functions such as shut-off, regulation, flow guidance, backflow prevention, pressure stabilization, flow diversion, or overflow pressure relief. V-type ball valves are fixed ball valves and are also single-seat sealed ball valves.

[0003] Existing ball valves can only provide unidirectional sealing. When the medium flows in the opposite direction, leakage occurs in the sealing pair formed by the ball and the valve seat, failing to meet the requirements for bidirectional sealing. A Chinese patent application (application number 2024108492506) discloses a full-bore bidirectional sealing C-type ball valve, which, in conjunction with its… Figure 2 As shown, it includes a valve body 1, a ball 5, a valve seat 6, a support ring 10, a disc spring 12, a spacer ring 16, a combined sealing gasket 17, and a pressure sleeve 23. There are two combined sealing gaskets 17, located on both sides of the spacer ring 16. The pressure sleeve 23 and the support ring 10 respectively contact the two combined sealing gaskets 17. The disc spring 12 is positioned between the valve body 1 and the support ring 10. When the medium flows in the forward direction, the ball 5 is pushed towards the valve seat 6 to form a hard seal. When the medium flows in the reverse direction, the ball 5 moves away from the valve seat 6. The disc spring 12 pushes the support ring 10, the combined sealing gasket 17, the spacer ring 16, the pressure sleeve 23, and the valve seat 6 as a whole, causing the valve seat 6 to move towards the ball 5 and close to the ball. The outer wall of ball 5 is tightly fitted to form a hard seal. Although it achieves bidirectional sealing to a certain extent, there are still defects. Under long-term wear of ball 5 and valve seat 6, or when valve seat 6 is pushed by the medium in reverse, valve seat 6 will move closer to ball 5 under the push of butterfly spring 12. This causes butterfly spring 12 to stretch and reduce its elasticity. The compressive force on combined sealing gasket 17 is reduced, and combined sealing gasket 17 shrinks radially. This can easily cause the tightness between the outer wall of combined sealing gasket 17 and the inner wall of valve body 1, or between the inner wall of combined sealing gasket 17 and valve seat 6 to decrease, resulting in gaps. This leads to leakage when the ball valve is closed, as the medium flows between valve body 1 and valve seat 6. Utility Model Content

[0004] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a V-type ball valve with stable sealing between the valve body and the valve seat.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a V-type ball valve with stable sealing, comprising a valve body, a ball positioned within the valve body, and a valve seat capable of forming a hard seal with the ball. The outer wall of the valve seat is provided with a sealing ring groove with its opening facing the valve body opening. It also includes a sealing assembly located within the sealing ring groove and forming a soft seal with the inner wall of the valve body, a spring seat for pressing the sealing assembly and coaxially arranged with the valve seat, a plurality of pre-tightening bolts circumferentially distributed around the axis of the spring seat and passing through the spring seat and connected to the valve seat, a valve seat cover fixedly connected to the valve body, and a plurality of sealing springs circumferentially distributed around the axis of the spring seat and limited to the valve seat cover and the spring seat. By rotating the pre-tightening bolts relative to the spring seat, the sealing assembly undergoes corresponding elastic deformation.

[0006] As a further improvement of this utility model, the sealing assembly includes a spacer ring and two sealing rings located on both sides of the spacer ring. The two sealing rings are provided with V-shaped support grooves on the surfaces facing the spring seat. The spring seat and the spacer ring are provided with support angles for opening the support grooves. The support angles penetrate into the support grooves so that the inner and outer walls of the sealing rings are tightly fitted with the groove wall of the sealing ring groove and the inner wall of the valve body, respectively.

[0007] As a further improvement of this utility model, both of the sealing rings are provided with obliquely cut annular grooves coaxial with the valve seat on their surfaces facing the valve seat. The cavity enclosed by the groove walls of the obliquely cut annular grooves is frustoconical with its larger end facing the valve seat. The surface of the spacer ring facing the spring seat and the bottom of the sealing ring groove are both provided with platform wall rings for opening the obliquely cut annular grooves. The platform wall rings penetrate into the obliquely cut annular grooves, so that the outer wall of the sealing rings fits tightly with the inner wall of the valve body.

[0008] As a further improvement of this utility model, the valve seat includes a seat body that forms a hard seal with the ball and a sealing ring coaxially connected to the seat body, the sealing ring groove is located on the sealing ring, and the pre-tightening bolt is connected to the sealing ring.

[0009] As a further improvement of this utility model, a sealing gasket is provided between the sealing ring and the seat body.

[0010] The beneficial effects of this utility model are as follows: By tightening the pre-tightening bolt relative to the spring seat, the sealing component undergoes corresponding elastic deformation, and the inner and outer walls of the sealing component are tightly attached to the groove wall of the sealing ring and the inner wall of the valve body, respectively. The spring seat, sealing component, and valve seat form a whole, which ensures that the deformation of the sealing component is independent of the deformation of the sealing spring. Compared with the prior art, this design not only provides bidirectional sealing but also ensures stable sealing between the valve seat and valve body and the sealing component, effectively compensating for the defect of leakage caused by the medium flowing between the valve seat and valve body. The design of changing the deformation of the sealing component by rotating the pre-tightening bolt can change the sealing degree between the valve seat and valve body and the sealing component according to actual needs and installation conditions, and has a wide range of applications. Attached Figure Description

[0011] Figure 1 This is a partial view of the present invention when it is closed;

[0012] Figure 2 for Figure 1 Enlarged view of point A in the middle;

[0013] Figure 3 for Figure 1 Enlarged view of point B in the middle;

[0014] Figure 4 for Figure 2 The split diagram.

[0015] Reference numerals in the attached drawings: 1. Valve body; 2. Ball; 3. Valve seat; 31. Seat body; 32. Sealing ring; 33. Sealing gasket; 4. Sealing ring groove; 5. Sealing assembly; 51. Spacer ring; 52. Sealing ring; 53. Support groove; 54. Support angle; 55. Beveled ring groove; 56. Platform wall ring; 6. Spring seat; 7. Preload bolt; 8. Valve seat cover; 9. Sealing spring. Detailed Implementation

[0016] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Identical components are indicated by the same reference numerals.

[0017] Reference Figures 1 to 4 As shown, a V-type ball valve with stable sealing in this embodiment includes a valve body 1, a ball 2 positioned inside the valve body 1, and a valve seat 3 that can form a hard seal with the ball 2. A sealing ring groove 4 with an opening facing the valve body 1 is provided on the outer wall of the valve seat 3.

[0018] Based on the aforementioned prior art, it also includes a sealing assembly 5, a spring seat 6, several pre-tightening bolts 7, a valve seat cover 8, and several sealing springs 9. The sealing assembly 5 is annular. The spring seat 6 includes a connecting ring with an inner diameter the same as the inner diameter of the valve seat cover 8 and a pressure ring coaxial with the connecting ring and able to extend into the sealing ring groove 4. The inner diameter of the pressure ring is larger than the inner diameter of the connecting ring. Multiple countersunk holes and multiple spring grooves are machined on the connecting ring. The openings of the spring grooves and the large openings of the countersunk holes are both located on the same annular surface of the connecting ring. The multiple countersunk holes and multiple spring grooves are all located on the same circle and are alternately arranged. The valve seat 3 is machined with threaded holes that correspond one-to-one with the multiple countersunk holes.

[0019] During assembly, the valve seat 3 is laid flat with the sealing ring groove 4 opening upwards. The sealing assembly 5 is then installed into the sealing ring groove 4. Next, the spring seat 6 is placed above the valve seat 3, and by rotating the spring seat 6, the multiple countersunk holes and multiple threaded holes are aligned. The pressure ring portion of the spring seat 6 extends into the sealing ring groove 4 and contacts the sealing assembly 5, with the spring groove opening upwards. Then, multiple pre-tightening bolts 7 are installed corresponding to the multiple countersunk holes. The pre-tightening bolts 7 pass through the countersunk holes and are screwed into the valve seat 3, but are not fully tightened. After all the pre-tightening bolts 7 are installed, the valve seat 3, sealing assembly 5, and spring seat 6 are assembled into the valve body 1. The valve seat 3 contacts the ball 2. By continuing to rotate the pre-tightening bolt 7, the spring seat 6 squeezes the sealing component 5. The sealing component 5 undergoes elastic deformation, and the inner and outer walls of the sealing component 5 are tightly fitted with the groove wall of the sealing ring groove 4 and the inner wall of the valve body 1, respectively. Finally, multiple sealing springs 9 are sequentially installed into multiple spring grooves. The valve seat cover 8 is fixedly connected to the open end of the valve body 1, so that the sealing springs 9 are limited to the spring grooves, and the spring seat 6, sealing component 5 and valve seat 3 are limited to the valve seat cover 8 and the ball 2. All the sealing springs 9 are in a compressed state and push the spring seat 6, sealing component 5 and valve seat 3 as a whole towards the ball 2.

[0020] When the ball valve is closed and the medium accumulates at the position of the ball 2, the ball 2 moves towards the valve seat 3 under the thrust of the medium, and the ball 2 and the valve seat 3 fit tightly together to form a hard seal; when the ball valve is closed and the medium accumulates at the position of the valve seat 3, the ball 2 moves away from the valve seat 3 under the thrust of the medium, and multiple sealing springs 9 exert a thrust on the spring seat 6, sealing assembly 5 and valve seat 3 as a whole, causing the spring seat 6, sealing assembly 5 and valve seat 3 as a whole to move towards the ball 2, and the valve seat 3 and the ball 2 remain in contact to form a hard seal. In the above two cases, the pre-tightening bolt 7 is not rotated, and the shape of the sealing assembly 5 remains constant, so the valve seat 3 and the valve body 1 maintain an effective seal with the sealing assembly 5;

[0021] Compared with existing technologies, this design not only provides bidirectional sealing but also ensures stable sealing between the valve seat 3 and valve body 1 and the sealing component 5, effectively compensating for the leakage caused by the medium flowing between the valve seat 3 and valve body 1. The design of changing the deformation of the sealing component 5 by rotating the pre-tightening bolt 7 can change the sealing degree between the valve seat 3 and valve body 1 and the sealing component 5 according to actual needs and installation conditions, making it widely applicable.

[0022] As an improved specific implementation, if the surface of the sealing component 5 being compressed is flat and the surface used to apply the compressive force is also flat, there is a situation where, when the sealing component 5 is compressed, only one of its outer wall and inner wall can move into place and fit tightly against the adjacent surface, resulting in media leakage. To solve the aforementioned problem, refer to... Figures 2 to 4As shown, the sealing assembly 5 includes a rigid spacer ring 51 and two soft sealing rings 52 located on both sides of the spacer ring 51. Both sealing rings 52 have V-shaped support grooves 53 machined on their surfaces facing the spring seat 6. Both the spring seat 6 and the spacer ring 51 have support angles 54 for opening the support grooves 53. During the tightening of the preload bolt 7, the spring seat 6 gradually moves towards the valve seat 3, and the spacer ring 51 also moves under the push of the sealing rings 52. The support angles 54 gradually penetrate the support grooves 53, causing the sealing rings 52 to be opened. The inner and outer walls of the sealing rings 52 then fit tightly against the groove wall of the sealing ring groove 4 and the inner wall of the valve body 1, respectively. This design ensures that the inner and outer walls of the sealing rings 52 move away from each other and move synchronously, and that both the outer and inner walls of the sealing rings 52 can fit tightly against adjacent surfaces. Compared to the prior art, which uses a rigid spring seat 6 or spacer ring 51 to open the soft sealing rings 52, this design ensures that the deformation of the sealing rings 52 is timely and effective.

[0023] As an improved specific implementation, with the increase in the thickness of the sealing ring 52 and the limited depth of the support groove 53, the sealing ring 52 only undergoes local elastic deformation to achieve effective sealing, resulting in low sealing efficiency. To solve the aforementioned problems, refer to... Figure 4 As shown, the faces of both sealing rings 52 facing the valve seat 3 are beveled to form obliquely cut annular grooves 55 coaxial with the valve seat 3. The cavity enclosed by the groove walls of the obliquely cut annular grooves 55 is frustoconical with the larger end facing the valve seat 3. The face of the spacer ring 51 facing the spring seat 6 and the bottom of the sealing ring groove 4 are both cut to form a frustoconical wall ring 56 for opening the obliquely cut annular grooves 55. As the two sealing rings 52 move toward the spacer ring 51 and the valve seat 3 respectively, the frustoconical wall ring 56 gradually penetrates into the obliquely cut annular grooves 55, so that the outer wall of the sealing ring 52 fits tightly against the inner wall of the valve body 1. This design can increase the area of ​​the outer wall of the sealing ring 52 in close contact with the inner wall of the valve body 1, increase the sealing area between the sealing ring 52 and the spacer ring 51 and between the sealing ring 52 and the valve seat 3, and further improve the sealing performance between the valve body 1 and the valve seat 3.

[0024] As a specific implementation of the improvement, since the valve seat 3 and the ball 2 need to rub frequently, the valve seat 3 is made of a harder and more wear-resistant material to avoid excessive wear. However, machining threaded holes on the valve seat 3 is difficult, and the cutting tools are easily damaged, increasing machining costs. To solve the aforementioned problems, refer to... Figure 2 and Figure 3 As shown, the valve seat 3 includes a seat body 31 that forms a hard seal with the ball 2 and a sealing ring 32 that is coaxially connected to the seat body 31. The material hardness of the sealing ring 32 is less than that of the seat body 31. The threaded hole and the sealing ring groove 4 are both machined on the sealing ring 32. The spring seat 6, the sealing assembly 5 and the sealing ring 32 are formed as a whole by the pre-tightening bolt 7. This design makes disassembly and assembly more convenient due to the reduced weight; it is also more efficient in processing and the cutting tools are more durable, effectively reducing processing costs.

[0025] As one specific implementation method of the improvement, refer to Figure 2 and Figure 3 As shown, a sealing gasket 33 is provided between the sealing ring 32 and the seat 31. The inner wall of the sealing gasket 33 matches the outer diameter of the part of the seat 31 to which it is fitted. Compared with the design that only uses the ring surface of the sealing ring 32 to fit tightly against the seat 31, this design can improve the sealing performance between the sealing ring 32 and the seat 31 and make up for the defect of gap caused by the seat 31 and the sealing ring 32 not moving synchronously.

[0026] The above description is merely a preferred embodiment of this utility model. The protection scope of this utility model is not limited to the above embodiments. All technical solutions falling within the scope of this utility model's concept are protected. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of this utility model should also be considered within the protection scope of this utility model.

Claims

1. A V-type ball valve with stable sealing, comprising a valve body (1), a ball (2) positioned within the valve body (1), and a valve seat (3) capable of forming a hard seal with the ball (2), wherein a sealing ring groove (4) with an opening facing the valve body (1) is provided on the outer wall of the valve seat (3), characterized in that: It also includes a sealing assembly (5) located in the sealing ring groove (4) and forming a soft seal with the inner wall of the valve body (1), a spring seat (6) for pressing the sealing assembly (5) and coaxially arranged with the valve seat (3), a number of pre-tightening bolts (7) that are circumferentially distributed around the axis of the spring seat (6) and pass through the spring seat (6) and connected to the valve seat (3), a valve seat cover (8) fixedly connected to the valve body (1), and a number of sealing springs (9) that are circumferentially distributed around the axis of the spring seat (6) and limited between the valve seat cover (8) and the spring seat (6). By rotating the pre-tightening bolts (7) relative to the spring seat (6), the sealing assembly (5) undergoes corresponding elastic deformation.

2. The V-type ball valve with stable sealing according to claim 1, characterized in that: The sealing assembly (5) includes a spacer ring (51) and two sealing rings (52) located on both sides of the spacer ring (51). The two sealing rings (52) are provided with V-shaped support grooves (53) on the surface facing the spring seat (6). The spring seat (6) and the spacer ring (51) are provided with support angles (54) for opening the support grooves (53). By extending the support angles (54) into the support grooves (53), the inner wall and outer wall of the sealing ring (52) are tightly fitted with the groove wall of the sealing ring groove (4) and the inner wall of the valve body (1), respectively.

3. The V-type ball valve with stable sealing according to claim 2, characterized in that: Both sealing rings (52) have obliquely cut annular grooves (55) coaxial with the valve seat (3) on their surfaces facing the valve seat (3). The cavity formed by the groove walls of the obliquely cut annular grooves (55) is frustum-shaped with the larger end facing the valve seat (3). The surface of the spacer ring (51) facing the spring seat (6) and the bottom of the sealing ring groove (4) are provided with platform wall rings (56) for opening the obliquely cut annular grooves (55). The platform wall rings (56) penetrate into the obliquely cut annular grooves (55) so that the outer wall of the sealing ring (52) fits tightly with the inner wall of the valve body (1).

4. A V-type ball valve with stable sealing according to claim 1, 2, or 3, characterized in that: The valve seat (3) includes a seat body (31) that forms a hard seal with the ball (2) and a sealing ring (32) that is coaxially connected to the seat body (31). The sealing ring groove (4) is located on the sealing ring (32), and the pre-tightening bolt (7) is connected to the sealing ring (32).

5. A V-type ball valve with stable sealing according to claim 4, characterized in that: A sealing gasket (33) is provided between the sealing ring (32) and the seat (31).

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