Plug valve capable of adjusting plug cock up and down
By introducing adjustment bolts and lifting pads into the plug valve, the upper and lower adjustment of the plug is achieved, which solves the problems of degraded sealing performance and poor working conditions of traditional plug valves, and significantly improves the sealing performance and working conditions.
Patent Information
- Application Number
- CN202520629746.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-07
- Publication Date
- 2025-05-13
- Estimated Expiration
- 2035-04-07
AI Technical Summary
After long-term use, traditional plug-in valves are difficult to maintain optimal sealing performance due to wear, corrosion and changes in working conditions, resulting in media leakage, and it is difficult to adapt to different working conditions when the plug-in valve is fixed.
A plug valve that can adjust the cock up and down is designed. By setting adjustment bolts and lifting pads at the bottom of the valve body, the upper and lower adjustment of the cock is achieved, improving sealing performance and adapting to different working conditions.
By adjusting the position of the plug, the sealing performance is significantly improved, media leakage is avoided, complex and variable working conditions are adapted to the requirements, and the reliability and applicability of the valve are improved.
Smart Images
Figure CN222864180U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of plug valves, in particular to a plug valve with a plug capable of adjusting the plug up and down. Background Art
[0002] In traditional plug valves, the seal between the plug and the valve seat is usually guaranteed by the predetermined installation position and the initial assembly accuracy. After long-term use, the plug is prone to wear, corrosion or slight deformation between the plug and the valve seat due to the scouring, corrosion and frequent opening and closing of the medium. This may lead to a decrease in the fit between the sealing surfaces, thereby affecting the sealing performance of the valve and causing the problem of medium leakage. Moreover, in practical applications, due to factors such as the installation error of the pipeline system and the pressure fluctuation of the medium, it is difficult to accurately ensure that the sealing effect between the plug and the valve seat is always in the best state. For example, in some chemical pipelines with extremely high sealing requirements, even a small amount of medium leakage may cause serious safety accidents and economic losses. Therefore, the structure of the traditional plug valve is relatively fixed, and its plug position is basically not adjustable after assembly. This leads to the fact that it is often difficult to optimize the performance of the valve through simple adjustments when facing complex and changeable working conditions, and it is difficult to adapt to different working conditions. Utility Model Content
[0003] Purpose of the utility model: In order to overcome the defects of the prior art, the utility model provides a plug valve with a plug that can be adjusted up and down, which can improve the sealing performance and adapt to different working conditions by adjusting the up and down position of the plug.
[0004] The technical solution of the utility model comprises a valve body, a plug movably installed in the valve body, a valve stem fixedly connected to the plug, and a valve cover fixedly installed above the valve body, wherein a flow channel cavity is provided in the valve body, a bottom hole is opened at the bottom of the valve body, a cover plate is provided at the bottom hole, an adjusting bolt is threadedly arranged on the cover plate, the adjusting bolt passes through the outside of the cover plate to the flow channel cavity, a lifting pad is also movably installed on the cover plate, the lifting pad abuts against the top position of the adjusting bolt and presses against the bottom of the plug; a limiting pressure cap is outer sleeved on the valve stem, the limiting pressure cap is threadedly connected to the valve cover through an adjusting stud, a step is provided on the valve stem, and the limiting pressure cap abuts against the step.
[0005] By adopting the above technical solution, an adjusting bolt and a lifting pad matched therewith are arranged at the bottom of the valve body. When the adjusting bolt is rotated, the adjusting bolt moves up and down in the cover plate. Since the lifting pad abuts against the top of the adjusting bolt and presses against the bottom of the plug, the plug can be driven to move up and down in the valve body, thereby adjusting the up and down position of the plug to improve the sealing performance and meet the requirements for the fit between the plug and the valve seat under different working conditions. The movable installation method of the lifting pad on the cover plate enables it to move stably in the cover plate when subjected to the force of the adjusting bolt, and evenly transmits the force to the plug, ensuring the stability and accuracy of the up and down movement of the plug, avoiding shaking or offset, etc., which affects the normal operation of the valve. In addition, the step on the valve stem abuts against the limit pressure cap connected to the valve cover through the adjusting stud, which can effectively limit the movement range of the valve stem in the axial direction, cooperate with the adjusting bolt to adjust the position of the plug, prevent the valve stem from excessive displacement during operation, ensure the relative position accuracy between the plug and the valve seat during the adjustment of the plug, and thus improve the reliability of the adjustment.
[0006] In a possible design, the top of the adjusting bolt is pointed, a limiting groove is provided in the cover plate, the lifting pad forms a sliding contact with the limiting groove, and a conical groove is provided on the bottom surface of the lifting pad, which is adapted to the pointed position of the top of the adjusting bolt.
[0007] With the above design, when the adjusting bolt is rotated, the pointed top end can act more accurately on the conical groove of the lifting pad, effectively converting the axial force of the adjusting bolt into a vertical upward force on the lifting pad, thereby more accurately controlling the up and down movement position of the plug, thereby improving the accuracy and reliability of the adjustment; in addition, the lifting pad forms a sliding contact with the limit groove in the cover plate, providing a guide for the movement of the lifting pad, so that it can only move up and down along the direction of the limit groove, avoiding deflection or shaking during movement, thereby ensuring the stability and accuracy of the adjustment process.
[0008] In a possible design, a soft spacer is installed on the inner side of the cover plate, the middle of the soft spacer is padded between the plug and the lifting pad, and the edge of the soft spacer is fixed between the cover plate and the valve body.
[0009] With the above design, the soft gasket plays a role of buffering and sealing, effectively reducing the direct friction and wear between the plug and the lifting pad. The soft gasket has a certain elasticity and sealing performance. Even if the lifting pad moves up and down under force, the soft gasket can still isolate the medium from direct contact with the cover plate, lifting pad, and adjusting bolt, thereby preventing leakage of corrosive media.
[0010] In a possible design, a hard washer and a soft washer are also coated on the valve stem. The hard washer and the soft washer are installed between the step and the limiting gland in sequence, and the hard washer is in contact with the step.
[0011] With the above design, the hard washer provides rigid support to ensure the stability of the valve stem during operation; while the soft washer acts as a buffer to reduce operating noise and vibration and protect the valve stem from excessive wear. BRIEF DESCRIPTION OF THE DRAWINGS
[0012] Figure 1 It is a cross-sectional view of the utility model;
[0013] Figure 2 For this utility model Figure 1 Cross-section of the middle AA surface;
[0014] Figure 3 For this utility model Figure 2 A partial enlarged view of point B in the middle;
[0015] Among them, 1. valve body; 11. flow channel cavity; 2. plug; 3. valve stem; 31. step; 32. hard gasket; 33. soft gasket; 4. valve cover; 41. packing gland; 42. limit gland; 43. adjusting stud; 5. cover plate; 51. adjusting bolt; 52. lifting pad; 521. conical groove; 53. limit groove; 54. soft spacer. DETAILED DESCRIPTION
[0016] like Figure 1-Figure 3 The plug valve shown in the figure can adjust the plug up and down, including a valve body 1, a plug 2 movably installed in the valve body 1, a valve stem 3 fixedly connected to the plug 2, and a valve cover 4 fixedly installed above the valve body 1. The valve body 1 has a flow channel cavity 11, and the bottom of the valve body 1 is provided with a bottom hole, and the bottom hole is covered with a cover plate 5, which is fixed to the bottom hole by bolts to prevent leakage. The cover plate 5 is threaded with an adjusting bolt 51, which passes from the outside of the cover plate 5 into the flow channel cavity 11, and the nut head of the adjusting bolt 51 is located outside the cover plate 5. The cover plate 5 is also movably installed with a lifting pad 52, which abuts against the top position of the adjusting bolt 51 and presses against the bottom of the plug 2. In addition to the existing packing gland 41, the valve stem 3 is also covered with a limit gland 42. The limit gland 42 is threadedly connected to the valve cover 4 through two adjusting studs 43. The valve stem 3 is provided with a step 31, and the limit gland 42 is matched with the step 31. By rotating the adjusting bolt 51, its upward thrust can act on the lifting pad 52, thereby lifting the plug 2 to adjust the upper and lower positions of the plug 2, effectively compensating for the poor sealing between the plug 2 and the valve seat caused by long-term use, installation errors and other factors, and improving the sealing performance of the valve. In addition, the position of the limit gland 42 is changed by rotating the adjusting stud 43 to re-limit the valve stem 3. In this way, the valve stem 3 can be limited in the axial direction to prevent the valve stem 3 from excessive displacement, and the movement of the valve stem 3 and the plug 2 can be made more stable and controllable when the plug 2 needs to be adjusted.
[0017] The top of the adjusting bolt 51 is pointed, and a limiting groove 53 is provided in the cover plate 5. The lifting pad 52 forms a sliding contact with the limiting groove 53. The bottom surface of the lifting pad 52 is provided with a tapered groove 521, and the tapered groove 521 is adapted to the tip of the adjusting bolt 51. The tip of the adjusting bolt 51 is matched with the lifting pad 52 with the tapered groove 521. When the adjusting bolt 51 is rotated and pushed forward, it can ensure that the lifting pad 52 is subjected to more concentrated and stable force, and avoid the lifting pad 52 being offset or stuck due to uneven force, so that the lifting pad 52 can accurately transmit the lifting force of the adjusting bolt 51 to the cock 2; the limiting groove 53 limits the sliding path of the lifting pad 52, further ensuring the linearity of its movement, and preventing it from being skewed or dislocated during the working process, thereby reliably assisting the cock 2 to achieve up and down adjustment and maintain the stable operation of the valve.
[0018] The inner side of the cover plate 5 is covered with a flexible soft spacer 54, the middle position of the soft spacer 54 is placed between the plug 2 and the lifting pad 52, and the edge of the soft spacer 54 is fixed and squeezed between the cover plate 5 and the valve body 1. The soft spacer 54 acts as a buffer between the plug 2 and the lifting pad 52 to avoid direct rigid contact between the two, reduce mechanical damage caused by collision and friction during the process of adjusting the position of the plug 2 or normal opening and closing of the valve, protect the surface of the plug 2 and the lifting pad 52, and extend their service life; at the same time, the soft spacer 54 covers the inner side of the cover plate 5, and its edge is fixed between the cover plate 5 and the valve body 1, which can also enhance the sealing performance of the cover plate 5, prevent the medium from leaking from the gap between the bottom hole and the cover plate 5, and improve the overall sealing of the valve.
[0019] The valve stem 3 is also covered with a hard washer 32 and a soft washer 33, which are installed between the step 31 and the limit gland 42 in sequence, and the hard washer 32 is in contact with the step 31. The hard washer 32 is made of metal, and the soft washer 33 is made of polytetrafluoroethylene. The hard washer 32 provides stable axial support for the valve stem 3 and is in close contact with the step 31 of the valve stem 3, preventing the valve stem 3 from excessively sinking or moving upward when subjected to axial force (such as tension or pressure when adjusting the position of the plug 2), thereby enhancing the axial stability of the valve stem 3; the soft washer 33 plays a buffering and shock-absorbing role between the hard washer 32 and the limit pressure cover 42, absorbing the tiny vibrations that may be generated by the valve stem 3 during movement, avoiding wear between hard components due to vibration and collision, protecting the valve stem 3, the limit pressure cover 42 and other components, and reducing the transmission of vibration to the valve body 1, thereby maintaining the stability of the valve operation and further improving the reliability and durability of the valve.
Claims
1. A plug valve with a plug that can be adjusted up and down, comprising a valve body (1), a plug (2) movably mounted in the valve body (1), a valve stem (3) fixedly connected to the plug (2), and a valve cover (4) fixedly mounted above the valve body (1), wherein the valve body (1) has a flow channel cavity (11), and is characterized in that: The bottom of the valve body (1) is provided with a bottom hole, the bottom hole is covered with a cover plate (5), an adjusting bolt (51) is threadedly provided on the cover plate (5), the adjusting bolt (51) extends from the outside of the cover plate (5) to the flow channel cavity (11), and a lifting pad (52) is movably mounted on the cover plate (5), the lifting pad (52) abuts against the top end of the adjusting bolt (51) and presses against the bottom of the plug (2); a limiting gland (42) is sleeved on the valve stem (3), the limiting gland (42) is threadedly connected to the valve cover (4) via an adjusting stud (43), and a step (31) is provided on the valve stem (3), the limiting gland (42) abuts against the step (31).
2. The plug valve with an adjustable plug according to claim 1, characterized in that: The top end of the adjusting bolt (51) is pointed, a limiting groove (53) is provided in the cover plate (5), the lifting pad (52) forms a sliding contact with the limiting groove (53), and a conical groove (521) is provided on the bottom surface of the lifting pad (52), and the conical groove (521) is adapted to the pointed position of the top end of the adjusting bolt (51).
3. The plug valve with an adjustable plug according to claim 1 or 2, characterized in that: The inner side of the cover plate (5) is covered with a soft spacer (54), the middle position of the soft spacer (54) is cushioned between the stopcock (2) and the lifting pad (52), and the edge position of the soft spacer (54) is fixed between the cover plate (5) and the valve body (1).
4. The plug valve with an adjustable plug according to claim 1 or 2, characterized in that: The valve stem (3) is also covered with a hard washer (32) and a soft washer (33). The hard washer (32) and the soft washer (33) are installed in sequence between the step (31) and the limiting gland (42). The hard washer (32) is in contact with the step (31).