Balanced type pneumatic single-seat regulating valve

Abstract

The utility model provides a balanced type pneumatic single-seat adjusting valve which comprises a valve body, a valve seat, a valve cover, a valve element, a piston ring, a guide pipe and a pneumatic actuator. The valve body is provided with a middle cavity, an inlet channel and an outlet channel. The valve seat is installed in the middle cavity in the axis direction of the middle cavity. A mounting hole is formed in the valve cover, and a balance cavity is formed between the mounting hole and the outer wall of the valve element; the valve core is slidably arranged in the mounting hole; the piston ring is connected outside the valve element and located in the balance cavity, and the balance cavity is divided into a first cavity and a second cavity which are distributed up and down. Two ends of the conduit are communicated with the inlet channel and the first chamber; the pneumatic actuator is installed on the valve deck and connected with the valve element. The medium of the inlet channel can enter the first cavity through the guide pipe to act on the piston ring, downward acting force is applied to the valve element, unbalanced force generated when the high-pressure medium acts on the valve element from the valve port can be offset, driving thrust needed for closing the valve is remarkably reduced, and the sensitivity of the adjusting valve is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of valves, in particular to a balanced pneumatic single-seat regulating valve. Background Technique

[0002] A regulating valve can automatically adjust the opening degree of a valve according to a control signal in an automation system, so as to achieve the regulation of the flow rate, pressure, and temperature of a medium. Among them, a single-seat regulating valve is the most widely used regulating valve at present due to its simple structure, low price, good sealing performance, etc.

[0003] The valve core of the single-seat regulating valve in the prior art usually adopts a plunger structure, which is non-balanced. Under the action of high-pressure medium, the valve core will bear a large unbalanced force, resulting in too large a closing thrust of the valve, inaccurate regulation, and even jitter. At the same time, a larger-sized pneumatic actuator needs to be configured to overcome this unbalanced force to drive the valve core to move. Summary of the Utility Model

[0004] In view of this, the utility model provides a balanced pneumatic single-seat regulating valve to solve the technical problems that the valve core of the single-seat regulating valve in the above background technique will bear a large unbalanced force at high pressure, resulting in too large a closing thrust of the valve and inaccurate regulation.

[0005] The technical solution of the utility model is realized as follows:

[0006] The utility model provides a balanced pneumatic single-seat regulating valve, which includes a valve body, a valve seat, a valve cover, a valve core, a piston ring, a conduit, and a pneumatic actuator, wherein:

[0007] The valve body is provided with a middle cavity, an inlet passage, and an outlet passage. The inlet passage and the outlet passage are both perpendicular to the axis direction of the middle cavity. The inlet passage communicates with the bottom of the middle cavity, and the outlet passage is connected to the side of the middle cavity and is located above the inlet passage;

[0008] The valve seat is installed in the middle cavity along the axis direction of the middle cavity, and a valve hole communicating the middle cavity and the inlet passage is provided on the valve seat;

[0009] An installation hole is provided in the valve cover, and a balance cavity is formed between the installation hole and the outer wall of the valve core;

[0010] The valve core is slidably arranged in the installation hole, and the bottom of the valve core is used to close the valve hole;

[0011] The piston ring is connected to the outside of the valve core. The piston ring is located in the balance cavity and divides the balance cavity into a first chamber and a second chamber which are distributed up and down;

[0012] Both ends of the conduit are distributed and connected to the inlet passage and the first chamber;

[0013] The pneumatic actuator is installed on the valve cover and connected to the valve core.

[0014] On the basis of the above technical solutions, preferably, the mounting hole includes a first sealing hole, a sliding hole, a balance hole, and a second sealing hole arranged in sequence from bottom to top, and the piston ring is located in the balance hole;

[0015] The balanced pneumatic single-seat regulating valve further includes a first sealing ring and a second sealing ring sleeved outside the valve core; the first sealing ring is arranged at the uppermost end of the first sealing hole; the second sealing ring is arranged at the bottom of the second sealing hole to form the balance chamber between the first sealing ring and the second sealing ring.

[0016] On the basis of the above technical solutions, preferably, it further includes a first gland and a second gland; the first gland is connected to the first sealing hole and abuts against the outer wall and bottom end of the first sealing ring; the second sealing hole is a threaded hole, and the second gland is threadedly connected to the second sealing hole and presses against the top end of the second sealing ring.

[0017] On the basis of the above technical solutions, preferably, it further includes a metal gasket, the metal gasket is sleeved outside the valve core and located at the bottom of the second sealing hole, and the second sealing ring is arranged above the metal gasket.

[0018] On the basis of the above technical solutions, preferably, a pressure relief hole is arranged on the valve cover in the vertical direction along the axis of the valve cover, and the pressure relief hole communicates with the bottom of the balance hole to communicate with the second chamber.

[0019] On the basis of the above technical solutions, preferably, a first communication hole communicating with the inlet passage is arranged on the valve body, a second communication hole communicating with the first chamber is arranged on the valve seat, and both ends of the conduit are respectively connected to the first communication hole and the second communication hole.

[0020] On the basis of the above technical solutions, preferably, a first annular groove is arranged on the inner wall of the piston ring, and a second annular groove is arranged on the outer wall of the piston ring;

[0021] It further includes a first sealing ring and a second sealing ring, the first sealing ring is sealingly arranged in the first annular groove, and the second sealing ring is sealingly arranged in the second annular groove.

[0022] On the basis of the above technical solutions, preferably, a first seat opening is arranged at the bottom of the middle chamber, and the valve seat is connected to the first seat opening.

[0023] On the basis of the above technical solutions, preferably, a second seat opening is provided at the top of the middle cavity. The second seat opening includes a coaxially arranged seat opening hole and a third sealing hole, and the third sealing hole is located above the seat opening hole. An installation part and a sealing part are provided at the bottom of the valve cover. The installation part is arranged in the seat opening hole, and the sealing part is arranged in the third sealing hole.

[0024] A sealing gasket is further included, and the sealing gasket is sealingly arranged in the third sealing hole.

[0025] On the basis of the above technical solutions, preferably, the valve hole includes a sealing section, an inlet section, and an outlet section. The inlet section and the outlet section are respectively arranged at both ends of the sealing section, and the diameter of the sealing section is the smallest. A valve head is provided at the end of the valve core. The valve head includes a cylinder, a frustum, and a spherical head. The cylinder and the spherical head are respectively arranged at both ends of the frustum, and the small-diameter end of the frustum is matched and sealed with the sealing section.

[0026] The balanced pneumatic single-seat regulating valve of the present utility model has the following beneficial effects compared with the prior art:

[0027] (1) The balance cavity is divided into a first chamber and a second chamber which are distributed up and down by a piston ring. Both ends of the conduit are respectively communicated with the inlet passage and the first chamber. The medium in the inlet passage can enter the first chamber through the conduit and act on the piston ring, and give a downward force to the valve core, which can offset the unbalanced force generated by the high-pressure medium acting on the valve core from the valve port, significantly reducing the driving thrust required to close the valve, making the regulating valve more sensitive in action, improving the regulating performance, and at the same time, a pneumatic actuator with a smaller size can be selected, reducing the energy consumption.

[0028] (2) The first sealing ring is arranged at the uppermost end of the first sealing hole; the second sealing ring is arranged at the bottom of the second sealing hole to form the balance cavity between the first sealing ring and the second sealing ring, so that both ends of the balance cavity are sealed, and there will be no leakage at both ends of the balance cavity, and the medium pressure coming from the conduit can be fully utilized.

[0029] (3) A first annular groove is arranged on the inner wall of the piston ring, and a second annular groove is arranged on the outer wall of the piston ring. The first sealing ring is sealingly arranged in the first annular groove, and the second sealing ring is sealingly arranged in the second annular groove to seal between the outer wall of the piston ring and the sliding hole, and between the inner wall of the piston ring and the valve core, so that the medium pressure entering the first chamber from the conduit will not leak from the piston ring to the second chamber and can fully act on the piston ring, improving the reliability and stability of the device.

[0030] (4) A pressure relief hole is provided on the valve cover in the vertical direction along the axis of the valve cover. The pressure relief hole communicates with the bottom of the balance hole to communicate with the second chamber. The pressure relief hole communicates with the atmosphere, and the air in the second chamber can be discharged to avoid forming an airtight chamber in the second chamber and affecting the downward sliding of the piston ring, thereby improving the stability and reliability of the device. Description of the Drawings

[0031] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0032] Figure 1 It is a cross-sectional view of the balanced pneumatic single-seat control valve of the present invention;

[0033] Figure 2 For the present invention Figure 1 Partial enlarged view of part A;

[0034] Figure 3 For the present invention Figure 1 Partial enlarged view of part B;

[0035] Figure 4 It is a cross-sectional view of the valve body of the present invention;

[0036] Figure 5 It is a cross-sectional view of the valve cover of the present invention.

[0037] Explanation of the reference numerals in the drawings: 1-valve body, 2-valve seat, 3-valve cover, 4-valve core, 5-piston ring, 6-conduit, 7-pneumatic actuator, 8-first sealing ring, 9-second sealing ring, 10-first gland, 11-second gland, 12-metal gasket, 13-first sealing ring, 14-second sealing ring, 15-sealing gasket;

[0038] 100-balance chamber, 110-first chamber, 120-second chamber;

[0039] 101-middle chamber, 102-inlet passage, 103-outlet passage, 104-first communication hole, 105-first seat port, 106-second seat port, 1061-seat port hole, 1062-third sealing hole;

[0040] 210-valve hole, 211-sealing section, 212-inlet section, 213-outlet section;

[0041] 310 - Mounting hole, 311 - First sealing hole, 312 - Slide hole, 313 - Balance hole, 314 - Second sealing hole, 320 - Pressure relief hole, 330 - Second communication hole, 340 - Mounting part, 350 - Sealing part;

[0042] 410 - Valve head, 411 - Cylinder, 412 - Frustum, 413 - Ball head;

[0043] 501 - First annular groove, 502 - Second annular groove. Specific embodiments

[0044] Next, in combination with the embodiments of the present utility model, the technical solutions in the embodiments of the present utility model will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present utility model.

[0045] Refer to Figures 1-5 As shown, an embodiment of the present utility model provides a balanced pneumatic single-seat control valve, which includes a valve body 1, a valve seat 2, a valve cover 3, a valve core 4, a piston ring 5, a conduit 6 and a pneumatic actuator 7, wherein:

[0046] The valve body 1 is provided with a middle cavity 101, an inlet passage 102 and an outlet passage 103. Both the inlet passage 102 and the outlet passage 103 are perpendicular to the axis direction of the middle cavity 101. The inlet passage 102 communicates with the bottom of the middle cavity 101, and the outlet passage 103 is connected to the side of the middle cavity 101 and is located above the inlet passage 102; the medium enters from the inlet passage 102, passes through the middle cavity 101 and then flows out from the outlet passage 103;

[0047] The valve seat 2 is installed in the middle cavity 101 along the axis direction of the middle cavity 101, and a valve hole 210 communicating the middle cavity 101 and the inlet passage 102 is provided on the valve seat 2;

[0048] The valve cover 3 is provided with a mounting hole 310, and a balance cavity 100 is formed between the mounting hole 310 and the outer wall of the valve core 4;

[0049] The valve core 4 is slidably arranged in the mounting hole 310, and the bottom of the valve core 4 is used to close the valve hole 210;

[0050] The piston ring 5 is connected to the outside of the valve core 4. The piston ring 5 is located in the balance cavity 100 and divides the balance cavity 100 into a first chamber 110 and a second chamber 120 which are distributed up and down. The piston ring 5 can be threadedly connected to the valve core 4 and moves together with the valve core 4.

[0051] Both ends of the conduit 6 are respectively communicated with the inlet passage 102 and the first chamber 110.

[0052] The pneumatic actuator 7 is installed on the valve cover 3 and is connected to the valve core 4. The pneumatic actuator 7 is connected to the top of the valve cover 3 through a mounting nut, and the output end of the pneumatic actuator 7 is connected to the valve core 4 to drive the valve core 4 to slide along the mounting hole 310.

[0053] In the balanced pneumatic single-seat control valve provided in this embodiment, the balance cavity 100 is divided into a first chamber 110 and a second chamber 120 which are distributed up and down by the piston ring 5. Both ends of the conduit 6 are respectively communicated with the inlet passage 102 and the first chamber 110. The medium in the inlet passage 102 can enter the first chamber 110 through the conduit 6 and act on the piston ring 5, and give a downward acting force to the valve core 4, which can offset the unbalanced force generated by the high-pressure medium acting on the valve core at the valve port, significantly reducing the driving thrust required to close the valve, making the action of the control valve more sensitive, improving the regulating performance. At the same time, a pneumatic actuator 7 with a smaller size can be selected, reducing the energy consumption.

[0054] In some embodiments, the mounting hole 310 includes a first sealing hole 311, a sliding hole 312, a balance hole 313, and a second sealing hole 314 which are arranged in sequence from bottom to top. The piston ring 5 is located in the balance hole 313. The balanced pneumatic single-seat control valve further includes a first sealing ring 8 and a second sealing ring 9 sleeved outside the valve core 4. The first sealing ring 8 is arranged at the uppermost end of the first sealing hole 311. The second sealing ring 9 is arranged at the bottom of the second sealing hole 314 to form the balance cavity 100 between the first sealing ring 8 and the second sealing ring 9. By arranging the first sealing ring 8 at the uppermost end of the first sealing hole 311 and the second sealing ring 9 at the bottom of the second sealing hole 314 to form the balance cavity 100 between the first sealing ring 8 and the second sealing ring 9, the two ends of the balance cavity 100 are sealed, and there will be no leakage at the two ends of the balance cavity 100, and the medium pressure coming from the conduit 6 can be fully utilized.

[0055] In some embodiments, the balanced pneumatic single-seat control valve further includes a first gland 10 and a second gland 11; the first gland 10 is connected to the first sealing hole 311 and abuts against the outer wall and bottom end of the first sealing ring 8; the second sealing hole 314 is a threaded hole, and the second gland 11 is threadedly connected to the second sealing hole 314 and presses against the top end of the second sealing ring 9. The first gland 10 and the first sealing hole 311 can be connected by interference fit or threaded connection. A limiting protrusion is provided at the bottom of the first gland 10, and the limiting protrusion abuts against the bottom end of the first sealing ring 8, and the inner wall of the first gland 10 abuts against the outer wall of the first sealing ring 8, so that the top of the first sealing ring 8 abuts against the uppermost end of the first sealing hole 311, realizing the installation in place and fixation of the first sealing ring 8; by threadedly connecting the second gland 11 to the second sealing hole 314 and pressing against the top end of the second sealing ring 9, the installation in place and fixation of the second sealing ring 9 are realized.

[0056] In some embodiments, the balanced pneumatic single-seat control valve further includes a metal gasket 12. The metal gasket 12 is sleeved outside the valve core 4 and is located at the bottom of the second sealing hole 314, and the second sealing ring 9 is arranged above the metal gasket 12. By arranging the metal gasket 12 below the second sealing ring 9, the metal gasket 12 contacts the bottom of the second sealing hole 314, avoiding the second sealing ring 9 from sliding into the balance hole 313 due to excessive force when installing the second gland 11, and improving the reliability and stability of the device.

[0057] In some embodiments, a pressure relief hole 320 is provided on the valve cover 3 along the vertical direction of the axis of the valve cover 3. The pressure relief hole 320 communicates with the bottom of the balance hole 313 to communicate with the second chamber 120. By communicating the pressure relief hole 320 with the atmosphere, the air in the second chamber 120 can be discharged, avoiding the formation of an airtight chamber in the second chamber 120 and affecting the downward sliding of the piston ring 5, and improving the stability and reliability of the device.

[0058] In some embodiments, a first communication hole 104 communicating with the inlet passage 102 is provided on the valve body 1. The first communication hole 104 is parallel to the axis direction of the middle cavity 101. A second communication hole 330 communicating with the first chamber 110 is provided on the valve seat 2. The second communication hole 330 is perpendicular to the axis direction of the middle cavity 101. Both ends of the conduit 6 are respectively connected to the first communication hole 104 and the second communication hole 330, and the conduit 6 is in the shape of a right-angle turn. By connecting both ends of the conduit 6 to the first communication hole 104 and the second communication hole 330 respectively, the high-pressure medium in the inlet passage 102 is introduced into the first chamber 110. The medium pressure acts on the piston ring 5 and gives a downward acting force to the valve core 4, which can offset the unbalanced force generated by the high-pressure medium acting on the valve core from the valve port.

[0059] In some embodiments, a first annular groove 501 is provided on the inner wall of the piston ring 5, and a second annular groove 502 is provided on the outer wall of the piston ring 5; the balanced pneumatic single-seat regulating valve further includes a first sealing ring 13 and a second sealing ring 14. The first sealing ring 13 is sealingly disposed in the first annular groove 501, and the second sealing ring 14 is sealingly disposed in the second annular groove 502. By sealing the first sealing ring 13 in the first annular groove 501, the inner wall of the piston ring 5 and the valve core 4 are sealed. The second sealing ring 14 is sealingly disposed in the second annular groove 502 to seal the outer wall of the piston ring 5 and the sliding hole 312, so that the medium pressure entering the first chamber 110 from the conduit 6 will not leak from the piston ring 5 into the second chamber 120 and can fully act on the piston ring 5, improving the reliability and stability of the device.

[0060] In some embodiments, a first seat port 105 is provided at the bottom of the middle chamber 101. The first seat port 105 is coaxial with the middle chamber 101. The first seat port 105 communicates the middle chamber 101 and the inlet passage 102, and the valve seat 2 is connected to the first seat port 105. By connecting the valve seat 2 to the first seat port 105, the installation of the valve seat 2 is realized.

[0061] In some embodiments, a second seat port 106 is provided at the top of the middle chamber 101. The second seat port 106 includes a coaxial seat port hole 1061 and a third sealing hole 1062. The third sealing hole 1062 is located above the seat port hole 1061; an installation portion 340 and a sealing portion 350 are provided at the bottom of the valve cover 3. The installation portion 340 is disposed in the seat port hole 1061, and the sealing portion 350 is disposed in the third sealing hole 1062; the balanced pneumatic single-seat regulating valve further includes a gasket 15, and the gasket 15 is sealingly disposed in the third sealing hole 1062. By disposing the installation portion 340 in the seat port hole 1061, the sealing portion 350 in the third sealing hole 1062, and the gasket 15 sealingly disposed in the third sealing hole 1062, and the gasket 15 seals between the outer wall of the sealing portion 350 and the inner wall of the third sealing hole 1062, the seal at the connection between the valve cover 3 and the valve body 1 is realized, preventing the medium from leaking from the connection between the valve cover 3 and the valve body 1, and improving the reliability and stability of the device.

[0062] In some embodiments, the valve hole 210 includes a sealing section 211, an inlet section 212, and an outlet section 213. The inlet section 212 and the outlet section 213 are respectively arranged at two ends of the sealing section 211, and the diameter of the sealing section 211 is the smallest. A valve head 410 is arranged at the end of the valve core 4. The valve head 410 includes a cylinder 411, a frustum 412, and a spherical head 413. The cylinder 411 and the spherical head 413 are respectively arranged at two ends of the frustum 412. The small-diameter end of the frustum 412 is matched with the sealing section 211 for sealing. The cylinder 411 is connected to the large-diameter end of the frustum 412, and the spherical head 413 is hemispherical. The inlet section 212 and the outlet section 213 are respectively arranged at two ends of the sealing section 211, and a structure with larger diameters at both ends and a smaller diameter in the middle is adopted, which can facilitate the rapid flow of the medium at the valve hole 210 and improve the reliability of the device. Through the cooperation of the small-diameter end of the frustum 412 and the sealing section 211 for sealing, the sealing effect is good. Through the arrangement of the spherical head 413, the medium will not form a turbulent flow at the bottom of the valve core 4, improving the stability.

[0063] The working principle of the balanced pneumatic single-seat control valve is as follows: The piston ring 5 divides the balance chamber 100 into a first chamber 110 and a second chamber 120 distributed up and down. Both ends of the conduit 6 are respectively communicated with the inlet passage 102 and the first chamber 110. The medium in the inlet passage 102 can enter the first chamber 110 through the conduit 6 and act on the piston ring 5, giving a downward force to the valve core 4, which can offset the unbalanced force generated by the high-pressure medium acting on the valve core from the valve port, significantly reducing the driving thrust required to close the valve, making the action of the control valve more sensitive, improving the regulating performance. At the same time, a pneumatic actuator 7 with a smaller size can be selected, reducing the energy consumption.

[0064] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A balanced pneumatic single-seat regulating valve, characterized in that: It includes valve body, valve seat, valve cover, valve core, piston ring, guide tube and pneumatic actuator, among which: The valve body is provided with a middle cavity, an inlet channel and an outlet channel, the inlet channel and the outlet channel are both perpendicular to the axial direction of the middle cavity, the inlet channel is communicated with the bottom of the middle cavity, and the outlet channel is connected with the side of the middle cavity and is located above the inlet channel; The valve seat is installed in the middle cavity along the axial direction of the middle cavity, and a valve hole connecting the middle cavity and the inlet channel is provided on the valve seat; A mounting hole is provided in the valve cover, and a balancing cavity is formed between the mounting hole and the outer wall of the valve core; The valve core is slidably disposed in the mounting hole, and the bottom of the valve core is used to close the valve hole; The piston ring is connected to the outside of the valve core, and the piston ring is located in the balance chamber, and divides the balance chamber into a first chamber and a second chamber which are distributed up and down; Two ends of the conduit are connected to the inlet channel and the first chamber; The pneumatic actuator is mounted on the valve cover and connected to the valve core.

2. The balanced pneumatic single-seat regulating valve according to claim 1, characterized in that: The mounting hole comprises a first sealing hole, a sliding hole, a balancing hole, and a second sealing hole arranged in sequence from bottom to top, and the piston ring is located in the balancing hole; The balanced pneumatic single-seat regulating valve also includes a first sealing ring and a second sealing ring which are sleeved outside the valve core; the first sealing ring is arranged at the uppermost end of the first sealing hole; the second sealing ring is arranged at the bottom of the second sealing hole to form the balancing chamber between the first sealing ring and the second sealing ring.

3. The balanced pneumatic single-seat regulating valve according to claim 2, characterized in that: It also includes a first pressure cover and a second pressure cover; the first pressure cover is connected to the first sealing hole and abuts against the outer wall and bottom end of the first sealing ring; the second sealing hole is a threaded hole, the second pressure cover is threadedly connected to the second sealing hole, and abuts against the top end of the second sealing ring.

4. The balanced pneumatic single-seat regulating valve according to claim 3, characterized in that: It also includes a metal gasket, which is sleeved outside the valve core and located at the bottom of the second sealing hole, and the second sealing ring is arranged above the metal gasket.

5. The balanced pneumatic single-seat regulating valve according to claim 2, characterized in that: A pressure relief hole is provided on the valve cover in a vertical direction along the axis of the valve cover, and the pressure relief hole is connected to the bottom of the balance hole to connect to the second chamber.

6. The balanced pneumatic single-seat regulating valve according to claim 1, characterized in that: The valve body is provided with a first communicating hole communicating with the inlet channel, the valve seat is provided with a second communicating hole communicating with the first chamber, and both ends of the conduit are connected to the first communicating hole and the second communicating hole respectively.

7. The balanced pneumatic single-seat regulating valve according to claim 1, characterized in that: The inner wall of the piston ring is provided with a first annular groove, and the outer wall of the piston ring is provided with a second annular groove; It also includes a first sealing ring and a second sealing ring, wherein the first sealing ring is sealingly disposed in the first annular groove, and the second sealing ring is sealingly disposed in the second annular groove.

8. The balanced pneumatic single-seat regulating valve according to claim 1, characterized in that: A first seat opening is arranged at the bottom of the middle cavity, and the valve seat is connected to the first seat opening.

9. The balanced pneumatic single-seat regulating valve according to claim 8, characterized in that: The top of the middle cavity is provided with a second seat opening, the second seat opening includes a coaxial seat opening hole and a third sealing hole, and the third sealing hole is located above the seat opening hole; the bottom of the valve cover is provided with a mounting portion and a sealing portion, the mounting portion is arranged in the seat opening hole, and the sealing portion is arranged in the third sealing hole; It also includes a sealing gasket, which is sealed in the third sealing hole.

10. The balanced pneumatic single-seat regulating valve according to any one of claims 1 to 9, characterized in that: The valve hole includes a sealing section, an inlet section and an outlet section, wherein the inlet section and the outlet section are respectively arranged at the two ends of the sealing section, and the diameter of the sealing section is the smallest; a valve head is arranged at the end of the valve core, and the valve head includes a cylinder, a frustum and a ball head, wherein the cylinder and the ball head are respectively arranged at the two ends of the frustum, and the small-diameter end of the frustum cooperates with the sealing section for sealing.

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