All-welded ball valve with adjustable pre-tightening force
By introducing an adjustment ring groove and a grease injection valve into the fully welded ball valve, the problem of unstable preload between the valve seat and the ball core is solved, and the sealing stability and service life are achieved.
Patent Information
- Application Number
- CN202422472710.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-12
- Publication Date
- 2025-07-11
- Estimated Expiration
- 2034-10-12
AI Technical Summary
Due to processing errors, the existing fully welded ball valves have unstable static friction between the valve seat and the ball core, which is prone to locking or loosening, resulting in poor sealing effect and high cost of use.
The valve body is equipped with an adjustment ring groove and a grease injection valve. By injecting grease, the pretension force of the spring is changed, and the pretension force of the valve seat on the ball core is adjusted to ensure sealing and rotation convenience.
It realizes flexible adjustment of preload between the valve seat and the ball core, slows wear, extends service life, and reduces maintenance frequency and costs.
Smart Images
Figure CN223090041U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of all-welded ball valves, and more specifically, to an all-welded ball valve with adjustable pre-tightening force. Background Art
[0002] The all-welded ball valve is a type of ball valve. Its valve body seals all joints by welding to obtain a valve body with the fewest leakage points. As Figure 1 shown, the existing all-welded ball valve includes a valve body, a ball core located inside the valve body, valve seats positioned on both sides of the ball core, an upper valve stem and a lower valve stem that penetrate the valve body and are respectively located above and below the ball core. The valve body includes two semi-valve bodies that can move towards each other and a connecting ring that connects the two semi-valve bodies and allows the upper valve stem and the lower valve stem to penetrate. During the assembly process, the ball core is placed in the connecting ring, and then the upper valve stem and the lower valve stem are inserted from the upper and lower sides of the connecting ring respectively. After the upper valve stem and the lower valve stem are connected to the ball core in place, the two semi-valve bodies equipped with valve seats are successively welded to both sides of the connecting ring so that the two valve seats are in contact with the outer surface of the ball core. Due to processing dimension errors, when the two valve seats jointly clamp the ball core, the static friction force between the ball core and the valve seat is large, resulting in the ball core being locked. To solve this problem, the prior art often adds springs between the valve seat and the semi-valve body to solve the phenomenon of the ball core being locked and facilitate the rotation of the ball core. However, there are still defects. First, due to small gaps between the valve seat and the semi-valve body caused by processing errors or large spring elastic coefficients caused by the selection of springs, the static friction force between the valve seat and the ball core is large, resulting in difficult opening of the ball core and serious wear of the sealing surface between the ball core and the valve seat, leading to leakage. Second, due to large gaps between the valve seat and the semi-valve body caused by processing errors or small spring elastic coefficients caused by the selection of springs, the ball core and the valve seat are prone to looseness, resulting in poor hard-sealing effect. Third, after long-term use, as the sealing surfaces of the valve seat and the ball core wear, compared with before leaving the factory, the pre-tightening force between the valve seat and the ball core becomes smaller, and the valve seat and the ball core do not fit tightly, resulting in a deterioration of the hard-sealing effect and a high frequency of replacing the all-welded ball valve, increasing the use cost. Content of the Utility Model
[0003] Aiming at the deficiencies of the prior art, the purpose of the utility model is to provide an all-welded ball valve with adjustable pre-tightening force, easy to rotate, stable sealing effect and long service life.
[0004] To achieve the above object, the present utility model provides the following technical solution: A fully welded ball valve with adjustable pre-tightening force, comprising a valve body, a ball core positioned within the valve body, valve seats positioned on both sides of the ball core, and springs positioned between the valve body and the valve seats. Two adjusting ring grooves corresponding to the two springs respectively and coaxial with the corresponding valve seats are provided within the valve body. Adjusting rings capable of axially moving along the valve seats are provided within the two adjusting ring grooves. One end of each of the two adjusting rings abuts against the corresponding spring. The two adjusting rings are hermetically connected to the corresponding adjusting ring grooves. Two grease injection valves are provided outside the valve body. The two grease injection valves are respectively communicated with the two adjusting ring grooves. Grease is injected into the two adjusting ring grooves respectively through the two grease injection valves so that the adjusting rings push the springs.
[0005] As a further improvement of the present utility model, sealing rings are provided on both the inner wall and the outer wall of the two adjusting rings near the end of the adjusting ring away from the ball core.
[0006] As a further improvement of the present utility model, each of the two adjusting rings includes a middle ring in the same plane as the sealing ring, a top ring and a pushed ring respectively connected to both sides of the middle ring. The top ring abuts against the corresponding spring. The ring widths of both the top ring and the pushed ring are greater than the ring width of the middle ring. The ring width of the pushed ring is less than the ring width of the top ring.
[0007] The beneficial effects of the present utility model: Grease is injected into the corresponding adjusting ring grooves through the grease injection valves. The grease fills the space between the adjusting rings and the adjusting ring grooves. As the grease continues to be injected, the grease pushes the adjusting rings to axially move along the valve seats. The two adjusting rings respectively push the corresponding springs. If the valve seat has abutted against the surface of the ball core, the valve seat does not move, and the spring undergoes elastic deformation, thereby changing the pre-tightening force generated by the valve seat on the ball core. If it is found that the torque is too large when driving the ball core to rotate, the grease inside the adjusting ring grooves is evacuated through the grease injection valves, thereby reducing the compression amount of the spring. If the pre-tightening force between the valve seat and the ball core decreases after long-term use, grease is continuously injected into the adjusting ring grooves through the grease injection valves to restore the spring to its original pre-tightening force. Such a design can, compared with the prior art, flexibly change the pre-tightening force of the valve seat on the ball core during the assembly and use processes, thereby obtaining an appropriate static friction force, slowing down the wear rate between the ball core and the valve seat, enabling the driving mechanism to provide an appropriate driving force, ensuring the stability of the sealing performance between the valve seat and the ball core, thereby extending the service life and reducing the cost for users; the sealing rings are provided near the bottom of the corresponding adjusting ring grooves, which can ensure that the sealing rings will not come out of the adjusting ring grooves during movement, thereby ensuring the sealing effect between the adjusting rings and the adjusting ring grooves. Description of the Drawings
[0008] Figure 1 is a structural schematic diagram of the prior art;
[0009] Figure 2 is a structural schematic diagram of the present utility model;
[0010] Figure 3 is Figure 2 an enlarged view of part A in
[0011] Figure 4 is Figure 3 an enlarged view of part B in
[0012] Reference numerals: 1, valve body; 2, ball core; 3, valve seat; 4, spring; 5, adjusting ring groove; 6, adjusting ring; 61, middle ring; 62, top ring; 63, pushed ring; 7, grease injection valve; 8, sealing ring. Detailed implementation mode
[0013] The present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. The same components are denoted by the same reference numerals.
[0014] Referring to Figures 1 to 4 as shown, a fully welded ball valve with adjustable pre-tightening force in this embodiment includes a valve body 1, a ball core 2 positioned within the valve body 1, valve seats 3 positioned on both sides of the ball core 2, and a spring 4 positioned between the valve body 1 and the valve seats 3;
[0015] Based on the foregoing existing design, two adjusting ring grooves 5 are formed on the inner wall of the valve body 1 where two springs 4 abut. The two adjusting ring grooves 5 are coaxial with the corresponding valve seats 3 and are opposite to the corresponding springs 4. The widths of the two adjusting rings 6 match the widths of the two adjusting ring grooves 5 respectively. The lengths of the two adjusting rings 6 are less than the depths of the corresponding adjusting ring grooves 5. Grooves for accommodating the sealing rings 8 are formed on both the inner and outer walls of the two adjusting rings 6, near one end of the adjusting rings 6. The two grease injection valves 7 adopt the prior art, and two holes are formed on the outer wall of the valve body 1, which are respectively communicated with the bottoms of the two adjusting ring grooves 5 and are for connecting one end of the grease injection valves 7;
[0016] Before assembly, the valve body 1 is divided into two half valve bodies and a connecting ring. During the assembly process, the upper valve stem, lower valve stem, and ball core 2 are assembled in place with the connecting ring. Subsequently, the adjusting ring 6 with sealing rings 8 installed both inside and outside is placed in the adjusting ring groove 5. The sealing ring 8 is made of a soft material, such as rubber. The inner wall and outer wall of the adjusting ring 6 respectively form seals with the two groove walls of the adjusting ring groove 5. A space for grease accommodation is formed between the end of the adjusting ring 6 away from the ball core 2 and the bottom of the adjusting ring groove 5. Then, one end of the spring 4 is inserted into the adjusting ring groove 5 and abuts against one end of the adjusting ring 6. Then, the valve seat 3 is placed in the half valve body and abuts against the other end of the spring 4. Finally, the assembled half valve body is moved to one side of the connecting ring and welded. Repeat the above steps to assemble the other half valve body and weld it to the other side of the connecting ring. At this time, the two valve seats 3 are respectively located on both sides of the ball core 2. The two grease injection valves 7 are fixedly connected to the two holes on the outer wall of the valve body 1 respectively. Grease is injected into the corresponding adjusting ring groove 5 through the grease injection valve 7. The grease fills the space between the adjusting ring 6 and the adjusting ring groove 5. As the grease continues to be injected, the grease pushes the adjusting ring 6 to move axially along the valve seat 3. The two adjusting rings 6 respectively push the corresponding springs 4. If the valve seat 3 has abutted against the surface of the ball core 2, the valve seat 3 does not move, and the spring 4 undergoes elastic deformation, thereby changing the pre-tightening force exerted by the valve seat 3 on the ball core 2. If it is found that the torque is too large when driving the ball core 2 to rotate, the grease inside the adjusting ring groove 5 is evacuated through the grease injection valve 7, thereby reducing the compression amount of the spring 4. If the pre-tightening force between the valve seat 3 and the ball core 2 decreases after long-term use, grease is continuously injected into the adjusting ring groove 5 through the grease injection valve 7 to restore the spring 4 to its original pre-tightening force;
[0017] Such a design can, compared with the prior art, flexibly change the pre-tightening force of the valve seat 3 on the ball core 2 during the assembly and use processes, thereby obtaining an appropriate static friction force, slowing down the wear rate between the ball core 2 and the valve seat 3, enabling the driving mechanism to provide an appropriate driving force, ensuring the stability of the sealing performance between the valve seat 3 and the ball core 2, thus extending the service life and reducing the cost for users; the sealing ring 8 is arranged adjacent to the bottom of the corresponding adjusting ring groove 5, which can ensure that the sealing ring 8 will not come out of the adjusting ring groove 5 during movement, thereby ensuring the sealing effect between the adjusting ring 6 and the adjusting ring groove 5.
[0018] As a specific implementation of the improvement, refer to Figure 3 and Figure 4As shown, with the groove in the adjusting ring 6 for accommodating the sealing ring 8 as the boundary, the adjusting ring 6 is divided into a middle ring 61, a top ring 62 and a pushed ring 63 respectively connected to both sides of the middle ring 61. The top ring 62 abuts against the spring 4, and the pushed ring 63 faces the bottom of the corresponding adjusting ring groove 5. The ring widths of the top ring 62 and the pushed ring 63 are both greater than the ring width of the middle ring 61. The inner diameters of the top ring 62 and the pushed ring 63 are both smaller than the inner diameter of the middle ring 61, and the outer diameters of the top ring 62 and the pushed ring 63 are both greater than the outer diameter of the middle ring 61. The inner wall and the outer wall of the middle ring 61 are respectively in contact with the two sealing rings 8. The ring width of the pushed ring 63 is smaller than the ring width of the top ring 62. The inner diameter of the pushed ring 63 is greater than the inner diameter of the top ring 62, and the outer diameter of the pushed ring 63 is smaller than the outer diameter of the top ring 62. Such a design increases the gap between the pushed ring 63 and the adjusting ring groove 5. After the adjusting ring groove 5 is filled with grease, the area of the soft sealing ring 8 being squeezed increases, and the deformation is more significant, forcing the sealing ring 8 to be axially stressed and radially extended, further improving the fit between the sealing ring 8 and the wall of the adjusting ring groove 5, thereby improving the sealing performance and avoiding the phenomenon of communication on both sides of the vertical plane where the sealing ring 8 is located.
[0019] The above are only the preferred embodiments of the present invention. The protection scope of the present invention is not limited to the above embodiments. All technical solutions within the idea of the present invention belong to the protection scope of the present invention. It should be pointed out that for those of ordinary skill in the art in this technical field, several improvements and refinements made without departing from the principle of the present invention should also be regarded as within the protection scope of the present invention.
Claims
1. A fully welded ball valve with adjustable pre-tightening force, comprising a valve body (1), a ball core (2) positioned within the valve body (1), valve seats (3) positioned on both sides of the ball core (2), and a spring (4) positioned between the valve body (1) and the valve seats (3), characterized in that: Two adjusting ring grooves (5) corresponding to the two springs (4) respectively and coaxial with the corresponding valve seats (3) are arranged in the valve body (1). Adjusting rings (6) capable of axially moving along the valve seats (3) are arranged in both of the two adjusting ring grooves (5). One end of each of the two adjusting rings (6) abuts against the corresponding spring (4). The two adjusting rings (6) are hermetically connected to the corresponding adjusting ring grooves (5). Two grease injection valves (7) are arranged outside the valve body (1). The two grease injection valves (7) are respectively communicated with the two adjusting ring grooves (5). Grease is injected into the two adjusting ring grooves (5) respectively through the two grease injection valves (7) so that the adjusting rings (6) push the springs (4).
2. The all-welded ball valve with adjustable pre-tightening force according to claim 1, characterized in that: Sealing rings (8) are arranged on both the inner wall and the outer wall of each of the two adjusting rings (6) near the end of the corresponding adjusting ring (6) away from the ball core (2).
3. The fully welded ball valve with adjustable pre-tightening force according to claim 2, characterized in that: Each of the two adjusting rings (6) includes a middle ring (61) in the same plane as the sealing ring (8), a top ring (62) and a pushed ring (63) respectively connected to both sides of the middle ring (61). The top ring (62) abuts against the corresponding spring (4). The ring widths of both the top ring (62) and the pushed ring (63) are greater than the ring width of the middle ring (61). The ring width of the pushed ring (63) is less than the ring width of the top ring (62).