Digitized high-precision single-seat regulating valve and control method

Abstract

The application discloses a digital high-precision single-seat regulating valve, which comprises a valve body, a valve seat for filling a valve hole is arranged in the valve body, a gasket replacement mechanism is arranged between the valve seat and the valve body, the gasket replacement mechanism comprises a sealing gasket which is sleeved on the outer surface of the valve seat and located in the valve hole, a rotating cutting member for cutting the sealing gasket is arranged in the valve body, a lifting rod for taking out the sealing gasket is arranged on the left side of the valve body, and a pushing member for replacing a new gasket is sleeved on the valve seat; the gasket replacement mechanism, the valve body and the valve seat are combined, so that when the sealing gasket needs to be replaced due to insufficient sealing, the sealing gasket can be disassembled and replaced without disassembling and opening the whole single-seat regulating valve, the time consumed for disassembling the regulating valve is reduced, the inconvenience is reduced, the convenience of replacing the sealing gasket in the single-seat regulating valve is increased, and the single-seat regulating valve can be used again in time.

Description

Technical Field

[0001] This invention belongs to the field of single-seat control valve technology, specifically relating to a digital high-precision single-seat control valve and its control method. Background Technology

[0002] A single-seat control valve is a device that enables air-to-open or air-to-close operation. The valve body contains a valve core and a valve seat, and it features low leakage. For example, a high-efficiency pneumatic diaphragm cage-type single-seat control valve (publication number CN114754190A) includes a valve body. A valve cover is fixedly connected to the upper wall of the valve body. A valve seat is fixedly connected to the upper wall of the valve cover. A bracket is fixedly connected to the upper wall of the valve seat. An actuator is fixedly connected to the upper wall of the bracket. A mounting frame is fixedly connected to the left side wall of the bracket. A pneumatic device is fixedly connected to the left side wall of the mounting frame. The valve seat and the actuator are connected by the same valve stem. Connecting pipes are fixedly connected to both sides of the valve body, and the connecting pipes are connected to a retaining cover on the side wall away from the valve body. This high-efficiency pneumatic diaphragm cage-type single-seat control valve allows for convenient and quick assembly and disassembly without the use of bolts and flanges, improving operator efficiency and avoiding the problem of bolt corrosion over time, which affects operator convenience.

[0003] In the aforementioned patent, when the sealing gasket between the valve seat and the valve body is damaged, the entire regulating valve needs to be disassembled to remove and replace the internal sealing gasket. The entire disassembly and replacement process is cumbersome and time-consuming, which delays the working time of the regulating valve. To address this issue, we propose a digital high-precision single-seat regulating valve and control method. Summary of the Invention

[0004] The purpose of this invention is to provide a digital high-precision single-seat regulating valve and control method to solve the problem mentioned in the background art of the difficulty in replacing the damaged sealing gasket between the valve seat and valve body of the regulating valve.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a digital high-precision single-seat regulating valve, comprising a valve body, wherein a valve seat is provided inside the valve body to fill a valve hole, a gasket replacement mechanism is provided between the valve seat and the valve body, the gasket replacement mechanism includes a sealing gasket sleeved on the outer surface of the valve seat and located in the valve hole, a rotating cutting component for cutting the sealing gasket is provided inside the valve body, a lifting rod for removing the sealing gasket is provided on the left side of the valve body, and a pushing component for replacing a brand new gasket is sleeved above the valve seat.

[0006] Preferably, the rotating cutting component includes a cutting blade that is inclined and located on the right side of the valve seat. The upper end of the cutting blade is connected to a fixed seat fixed to the inner wall of the valve body through a rotating shaft. The upper end of the pushing component that passes through the upper surface of the valve body is rotatably connected to the cutting blade.

[0007] Preferably, a fixed connecting rod is horizontally arranged on the upper surface of the pushing component, an upper wedge is arranged at the vertical end of the fixed connecting rod, a lower wedge is arranged opposite to the upper wedge, and a reciprocating rod is arranged at the bottom of the lower wedge, with its other end passing through the valve body and extending to the right side of the cutting blade.

[0008] Preferably, a rotating plate is provided between the reciprocating rod and the cutting blade, and a guide rod that movably passes through the reciprocating rod is provided horizontally on the outer surface of the valve body.

[0009] Preferably, the pusher component includes a collar sleeved on the outside of the valve seat and fixed to the inner wall of the valve body. The inner wall of the collar is provided with multiple supporting elastic plates opposite each other. A replacement gasket is placed between two adjacent supporting elastic plates distributed in the height direction. Two arc-shaped push plates are symmetrically arranged on the upper surface of the uppermost replacement gasket.

[0010] Preferably, the upper surface of the arc-shaped push plate is vertically provided with a movable rod that penetrates the valve body and protrudes to the outside. Two circular plates are fixed at the upper end of the movable rod, and an elastic reset member located between the two circular plates is sleeved on the movable rod.

[0011] Preferably, a buffer component is provided at the right end of the valve body. The buffer component includes a sleeve installed at the flange at the right end of the valve body. Multiple buffer plates are inclinedly arranged inside the sleeve. Two adjacent buffer plates are opposite each other and staggered in the sleeve. Diversion holes are uniformly opened on the surface of the sleeve.

[0012] Preferably, the outer end of the buffer plate is rotatably connected to the inner wall of the sleeve, and the inner wall of the valve body is provided with an arc-shaped rod with its free end moving through the buffer plate. An elastic limiting member with its two ends fixed to the outer surface of the buffer plate and the inner wall of the valve body is sleeved on the arc-shaped rod.

[0013] The control method for a digital high-precision single-seat control valve involves several steps. First, the single-seat control valve is connected to the internet, allowing operators to remotely monitor and control it via a control system. Control signals are transmitted to the pneumatic actuator within the valve. The actuator receives the signal and automatically adjusts the valve seat position based on the information parameters, achieving precise flow control. Simultaneously, a digital valve positioner within the valve converts the current signal output from the control system into a pneumatic signal to drive the valve. The valve stem friction during operation counteracts the unbalanced force caused by fluctuations in medium pressure, ensuring the valve opening corresponds to the current signal output from the control system. Furthermore, intelligent configuration settings can be implemented to improve valve performance.

[0014] Compared with the prior art, the beneficial effects of the present invention are:

[0015] (1) By combining the gasket replacement mechanism, valve body and valve seat, the present invention can replace the gasket without disassembling the entire single-seat regulating valve when the gasket is insufficient and needs to be replaced. The whole process reduces the time and trouble of disassembling the regulating valve, increases the convenience of replacing the gasket in the single-seat regulating valve, and makes it convenient for the single-seat regulating valve to be reused in a timely manner.

[0016] (2) By combining the buffer component and the valve body, the present invention can buffer and divert the medium entering the valve body in advance, reduce the impact force of the medium entering the valve body and acting on the valve seat, thereby reducing the noise generated during the impact and playing a noise reduction role in the use of the entire regulating valve. Attached Figure Description

[0017] Figure 1 This is a cross-sectional view of the digital single-seat regulating valve of the present invention;

[0018] Figure 2 For the present invention Figure 1 Schematic diagram of the gasket replacement mechanism;

[0019] Figure 3 For the present invention Figure 2 A three-dimensional structural diagram of the gasket replacement mechanism;

[0020] Figure 4 For the present invention Figure 3 Exploded view of the pusher component;

[0021] Figure 5 For the present invention Figure 3 Schematic diagram of the rotating cutting component;

[0022] Figure 6 For the present invention Figure 2 A three-dimensional structural diagram of the buffer component;

[0023] In the diagram: 1. Valve body; 2. Valve seat; 21. Buffer hole; 3. Valve stem; 4. Gasket replacement mechanism; 41. Lifting rod; 411. Connecting drill bit; 42. Sealing gasket; 43. Rotating cutting component; 431. Cutting blade; 432. Fixed seat; 433. Fixed connecting rod; 434. Reciprocating rod; 435. Upper wedge; 436. Lower wedge; 437. Guide rod; 438. Rotating plate; 44. Pushing component; 441. Collar; 442. Gasket replacement; 443. Support elastic plate; 444. Movable rod; 445. Elastic reset component; 446. Arc-shaped push plate; 447. Connecting circular plate; 45. Hoop ring; 5. Valve core; 6. Pneumatic actuator; 7. Buffer component; 71. Sleeve; 72. Buffer plate; 73. Diverting hole; 74. Arc-shaped rod; 75. Elastic limit component; 8. Digital valve positioner. Detailed Implementation

[0024] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0025] Example 1

[0026] Please see Figures 1-5 This invention provides a technical solution: a digital high-precision single-seat control valve, including a valve body 1, a valve seat 2 that fills the valve hole inside the valve body 1, and a gasket replacement mechanism 4 between the valve seat 2 and the valve body 1. Using the gasket replacement mechanism 4, when the sealing gasket 42 is insufficient and needs replacement, the sealing gasket 42 can be removed and replaced without disassembling the entire single-seat control valve. This reduces the time and hassle of disassembling the control valve, increases the convenience of replacing the sealing gasket 42 inside the single-seat control valve, and facilitates the timely reuse of the single-seat control valve. The gasket replacement mechanism 4 includes a sealing gasket 42 sleeved on the outer surface of the valve seat 2 and located in the valve hole, fixed on the outer surface of the valve seat 2. The valve body 1 has a groove embedded in the inner surface of the sealing gasket 42. The valve body 1 is equipped with a rotating cutting component 43 for cutting the sealing gasket 42. A lifting rod 41 for removing the sealing gasket 42 is provided on the left side of the valve body 1. The lifting rod 41 is connected to an external rotating lifting system to facilitate pulling the lifting rod 41 outward. The hole on the surface of the valve body 1 through which the lifting rod 41 passes can be sealed by a sealing cover. A connecting drill bit 411 is provided at the inner end of the lifting rod 41. The connecting drill bit 411 can drill into the sealing gasket 42 as the lifting rod 41 moves. A pusher component 44 for replacing a new gasket is provided on the upper part of the valve seat 2, which can refill the lower end of the valve seat 2 with a new replacement gasket 442.

[0027] In this embodiment, preferably, a valve core 5 is provided on the top of the valve seat 2, and a valve stem 3 is provided inside the valve core 5 that penetrates the valve body 1. The lower end of the valve seat 2 is trapezoidal, which can both block the valve hole in the valve body 1 and adjust the depth of the lower end of the valve seat 2 into the valve hole, thereby adjusting the space left between the two for the medium to pass through. At the same time, buffer holes 21 are provided on the surfaces of both the valve seat 2 and the valve core 5, which can divert and reduce noise for the medium entering the valve body 1.

[0028] In this embodiment, preferably, the rotating cutting component 43 includes a cutting blade 431 inclined to the right side of the valve seat 2. The cutting blade 431 is close to the valve stem 3. As the valve seat 2 moves upward, it drives the sealing gasket 42 to move upward and contact the cutting blade 431. The cutting blade 431 cuts one side of the sealing gasket 42 and leaves a small connection point, so that the sealing gasket 42 is still fitted on the valve seat 2. The upper end of the cutting blade 431 is connected to the fixing seat 432 fixed to the inner wall of the valve body 1 through a set rotating shaft, so that the rotation of the cutting blade 431 does not affect the downward movement of the new replacement gasket 442. The upper end of the pushing component 44 penetrates through the upper surface of the valve body 1 and is rotatably connected to the cutting blade 431, so that the movement of the pushing component 44 drives the cutting blade 431 to rotate, so that the rotation of the cutting blade 431 and the installation of the replacement gasket 442 are synchronized.

[0029] In this embodiment, preferably, a fixed connecting rod 433 is horizontally arranged on the upper surface of the pushing component 44. The fixed connecting rod 433 can be L-shaped. An upper wedge block 435 is provided at the vertical end of the fixed connecting rod 433. When the pushing component 44 is pressed, the fixed connecting rod 433 and the upper wedge block 435 can be driven to move downward. A lower wedge block 436 is arranged opposite to the upper wedge block 435. When the two are in inclined contact, as the upper wedge block 435 moves downward, the lower wedge block 436 can be driven to move to the right. The bottom of the lower wedge block 436 is provided with another end that passes through the valve body 1 and extends to the cutting blade. A reciprocating rod 434 is located on the right side of the cutting blade 431. A rotating plate 438 is provided between the reciprocating rod 434 and the cutting blade 431. The rotating plate 438 is T-shaped and has a rectangular hole at its left end. A fixing post is provided on the surface of the cutting blade 431, which is located in the rectangular hole. This allows the fixing post to slide in the rectangular hole as the cutting blade 431 rotates. A guide rod 437 is horizontally provided on the outer surface of the valve body 1 and extends through the reciprocating rod 434. The guide rod 437 can guide and limit the reciprocating rod 434, so that the reciprocating rod 434 can move stably left and right.

[0030] In this embodiment, preferably, the reciprocating rod 434 can be Z-shaped, with the right end of the reciprocating rod 434 located outside the valve body 1. At the same time, an elastic element is provided between the right end of the reciprocating rod 434 and the outer surface of the valve body 1, which not only does not affect the movement of the reciprocating rod 434, but also facilitates the reciprocating rod 434 and the cutting blade 431 to reset. After the cutting blade 431 is reset, when the valve stem 3 moves normally to disengage the valve seat 2 from the valve hole, the usable sealing gasket 42 on the valve seat 2 is located below the cutting blade 431, and the entire regulating valve can work normally.

[0031] In this embodiment, preferably, the pushing component 44 includes a collar 441 sleeved on the outside of the valve seat 2 and fixed to the inner wall of the valve body 1. Multiple supporting elastic plates 443 are arranged opposite each other on the inner wall of the collar 441. A replacement gasket 442 is placed between two adjacent supporting elastic plates 443 distributed in the height direction. The outer surface of the replacement gasket 442 is wrapped with a waterproof membrane to protect it. Each adjacent replacement gasket 442 has a small notch for the supporting elastic plate 443 to pass through, allowing the supporting elastic plate 443 to be positioned within the notch and support the replacement gasket 442. The uppermost replacement... Two arc-shaped push plates 446 are symmetrically arranged on the upper surface of the gasket 442. The arc-shaped push plates 446 can push the gasket 442 downward to move it. A movable rod 444 is vertically arranged on the upper surface of the arc-shaped push plate 446, penetrating the valve body 1 and exposed on the outside. The movable rod 444 can move up and down, and a connecting circular plate 447 is arranged between the two movable rods 444, which can move the two movable rods 444 downward at the same time. Two circular plates are fixed at the upper end of the movable rod 444, and an elastic reset member 445 is sleeved on the movable rod 444 between the two circular plates. The elastic reset member 445 can facilitate the movable rod 444 to move upward and reset.

[0032] In summary, during use, the sealing gasket 42 is fitted onto the valve seat 2 and located in the valve hole. When the sealing effect of the sealing gasket 42 is poor and needs to be replaced, the valve stem 3 moves upward, causing the valve seat 2 to move upward. As the valve seat 2 moves upward, the sealing gasket 42 contacts the cutting blade 431, and its edge is cut open by the cutting blade 431, leaving a small connection point, so that the sealing gasket 42 is still fitted onto the valve seat 2. At this time, the lifting rod 41 is driven by the external drive cylinder to extend into the valve body 1 and rotates under the action of the drive motor, causing the connecting drill bit 411 to rotate and screw into the sealing gasket 42. As the lifting rod 41 moves outward, the frictional resistance between the connecting drill bit 411 and the sealing gasket 42 is large enough to cause the sealing gasket 42 to move outward with the lifting rod 41. When the valve body 1 is pulled outwards through the hole, the connection point of the gasket 42 at the cut is torn off. After being torn off, the gasket 42 moves outwards with the lifting rod 41 and is pulled out of the valve body 1. After the gasket 42 is pulled out of the valve body 1, the hole through which the lifting rod 41 passes is sealed with a sealing cap. At this time, the connecting circular plate 447 is pressed, which drives the movable rod 444 and the arc-shaped push plate 446 to move downwards. The elastic reset member 445 is in a compressed state, while the connecting circular plate 447 drives the fixed connecting rod 433 and the upper wedge 435 to move downwards. The upper wedge 435 fits with the lower wedge 436 and pushes the lower wedge 436 to move to the right. The lower wedge 436 drives the reciprocating rod 434 to move to the right. The rotating plate 438 rotates with the movement of the reciprocating rod 434. 8. Rotation causes the cutting blade 431 to rotate downwards a certain distance around the rotating shaft, maintaining a suitable distance between the cutting blade 431 and the valve seat 2. The blade tip will not contact the sealing gasket 42. The arc-shaped push plate 446 moves downwards, pushing the replacement gasket 442 to move. The supporting elastic plate 443 bends outwards due to external force, but this does not affect the downward movement of the replacement gasket 442. The pushing force places the lowermost replacement gasket 442 onto the clamping ring 45. The clamping ring 45 stretches and embeds the replacement gasket 442 for fixation. At this time, the upper replacement gasket 442 moves downwards by one position and is inserted into the small notch by the lower, reset supporting elastic plate 443, providing support for the replacement gasket 442 and facilitating its next replacement. After replacement, the external force on the movable rod 444 is removed. The elastic reset component 445 regains its elasticity, causing the movable rod 444 and the arc-shaped push plate 446 to move upward. At the same time, it causes the upper wedge block 435 to move upward and disengage from the lower wedge block 436. The elastic component that was stretched by the reciprocating rod 434 regains its elasticity, causing the reciprocating rod 434 to move to the left, allowing the rotating plate 438 and the cutting blade 431 to return to their original positions for easy reuse. At this time, the valve stem 3 moves downward, causing the valve seat 2 to move downward and extend into the valve hole. The replacement gasket 42 contacts the inner wall of the valve hole, playing a sealing role. The whole process does not affect the normal use of the regulating valve and avoids the trouble and time consumption caused by disassembling and assembling the entire regulating valve, increasing the convenience and efficiency of replacing the sealing gasket 442.

[0033] Example 2

[0034] Reference Figure 6 This is the second embodiment of the present invention, which differs from the previous embodiment in that...

[0035] In this embodiment, preferably, a buffer member 7 is provided at the right end of the valve body 1. The buffer member 7 can buffer and divert the medium entering the valve body 1 in advance, reducing the impact force of the medium on the valve seat 2, thereby reducing the noise generated during the impact and playing a noise reduction role. The buffer member 7 includes a sleeve 71 installed at the flange at the right end of the valve body 1. Multiple buffer plates 72 are inclinedly arranged inside the sleeve 71. Two adjacent buffer plates 72 are opposite each other and staggered in the sleeve 71. Diversion holes 73 are evenly opened on the surface of the sleeve 71. The outer ends of the buffer plates 72 are connected to the inner ends of the sleeve 71. The sleeve 71 has a rotating connection, and the inner wall of the sleeve 71 is provided with a protrusion. The surface of the buffer plate 72 has a rectangular notch that rotates with the protrusion. The arc of the arc rod 74 is consistent with the rotation arc of the buffer plate 72, which facilitates the movement of the buffer plate 72 along the arc rod 74 and compresses the elastic limiting member 75 on the arc rod 74. The inner wall of the valve body 1 is provided with an arc rod 74 with its free end moving through the buffer plate 72. The arc rod 74 is fitted with an elastic limiting member 75 with both ends fixed to the outer surface of the buffer plate 72 and the inner wall of the valve body 1, respectively. The elastic limiting member 75 plays a buffering role against the impact generated by the flow of the medium.

[0036] In this embodiment, preferably, a pneumatic actuator 6 is provided on the top of the valve stem 3, and a digital valve positioner 8 is provided on the side of the valve stem 3. The digital valve positioner 8 has a digital display window on its surface, which can display the control signal value and valve position value, thereby increasing the ease of operation and viewing of the digital valve positioner 8.

[0037] In summary, during use, the sleeve 71 is installed at the end of the valve body 1. At this time, the buffer plate 72 forms a certain angle with the vertical direction. As the medium is transported, the impact force of the medium acts on the buffer plate 72 and is diverted and reduced from multiple diversion holes 73. When the buffer plate 72 is impacted, it will rotate along the arc rod 74 and compress the elastic limiting member 75. The elastic potential energy of the elastic limiting member 75 acts on the buffer plate 72 and is opposite to the flow direction of the medium, thus buffering the flowing medium. When the buffered medium enters the valve body 1, it will reduce the impact on the valve seat 2 and be diverted again by the buffer hole 21 on the valve seat 2, reducing the noise generated by the medium impact and playing a role in buffering and noise reduction.

[0038] Example 3

[0039] Reference Figures 1-4 This is the third embodiment of the present invention, which differs from the previous two embodiments in that...

[0040] In this embodiment, preferably, the single-seat control valve is first connected via the Internet. The operator can remotely monitor and control the single-seat control valve through the control system, transmitting the control signal to the pneumatic actuator 6 in the single-seat control valve. The pneumatic actuator 6 is a diaphragm actuator. Diaphragm adjustment can reduce friction, making the adjustment smoother and improving the adjustment accuracy. The pneumatic actuator 6 receives the signal and automatically adjusts the position of the valve seat 2 according to the information parameters in the signal to achieve precise flow control. At the same time, using the digital valve positioner 8 in the single-seat control valve, the current signal output by the control system can be converted into a pneumatic signal to drive the single-seat control valve. Based on the friction force of the valve stem 3 when the single-seat control valve is working, the unbalanced force generated by the medium pressure fluctuation is offset, so that the valve opening corresponds to the current signal output by the control system. Furthermore, the corresponding parameters can be intelligently configured to improve the performance of the control valve.

[0041] Example 4

[0042] This embodiment is obtained by combining Embodiment 1, Embodiment 2 and Embodiment 3.

[0043] In use, the pneumatic actuator 6 controls the valve stem 3 to move upward, which in turn moves the sealing gasket 42 upward. When it moves to the rotating cutting component 43, the sealing gasket 42 is cut by the cutting blade 431, and the lifting rod 41 and the connecting drill bit 411 remove the sealing gasket 42. The hole through which the lifting rod 41 passes is then sealed again. The replacement gasket 442 is then pushed downward by the pushing component 44 and installed on the valve seat 2, which fills and seals the gap between the valve seat 2 and the valve hole. The entire replacement process increases the convenience and efficiency of replacement compared to the overall disassembly and replacement of the regulating valve.

[0044] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A digital high-precision single-seat regulating valve, comprising a valve body (1), characterized in that: The valve body (1) is provided with a valve seat (2) that fills the valve hole. A gasket replacement mechanism (4) is provided between the valve seat (2) and the valve body (1). The gasket replacement mechanism (4) includes a sealing gasket (42) sleeved on the outer surface of the valve seat (2) and located in the valve hole. The valve body (1) is provided with a rotating cutting member (43) for cutting the sealing gasket (42). A lifting rod (41) for removing the sealing gasket (42) is provided on the left side of the valve body (1). A pushing member (44) for replacing a brand new gasket is sleeved on the top of the valve seat (2).

2. The digital high-precision single-seat regulating valve according to claim 1, characterized in that: The rotating cutting component (43) includes a cutting blade (431) that is inclined to the right side of the valve seat (2). The upper end of the cutting blade (431) is fixed to the inner wall of the valve body (1) by a fixed seat (432) through a rotating shaft. The pushing component (44) passes through the upper end of the upper surface of the valve body (1) and is rotatably connected to the cutting blade (431).

3. The digital high-precision single-seat regulating valve according to claim 2, characterized in that: A fixed connecting rod (433) is horizontally arranged on the upper surface of the pusher component (44). An upper wedge (435) is arranged at the vertical end of the fixed connecting rod (433). A lower wedge (436) is arranged opposite to the upper wedge (435). A reciprocating rod (434) with the other end passing through the valve body (1) and extending to the right side of the cutting blade (431) is arranged at the bottom of the lower wedge (436).

4. The digital high-precision single-seat regulating valve according to claim 3, characterized in that: A rotating plate (438) is provided between the reciprocating rod (434) and the cutting blade (431), and a guide rod (437) that moves through the reciprocating rod (434) is horizontally provided on the outer surface of the valve body (1).

5. The digital high-precision single-seat regulating valve according to claim 1, characterized in that: The pusher component (44) includes a collar (441) sleeved on the outside of the valve seat (2) and fixed on the inner wall of the valve body (1). The inner wall of the collar (441) is provided with a plurality of supporting elastic plates (443) opposite to each other. A replacement pad (442) is placed between two adjacent supporting elastic plates (443) distributed in the height direction. The uppermost replacement pad (442) has two arc-shaped push plates (446) symmetrically arranged on its upper surface.

6. The digital high-precision single-seat regulating valve according to claim 5, characterized in that: The upper surface of the arc-shaped push plate (446) is vertically provided with a movable rod (444) that penetrates the valve body (1) and protrudes to the outside. Two circular plates are fixed at the upper end of the movable rod (444), and an elastic reset member (445) located between the two circular plates is sleeved on the movable rod (444).

7. The digital high-precision single-seat regulating valve according to claim 1, characterized in that: A buffer component (7) is provided at the right end of the valve body (1). The buffer component (7) includes a sleeve (71) installed at the flange at the right end of the valve body (1). Multiple buffer plates (72) are inclinedly arranged inside the sleeve (71). Two adjacent buffer plates (72) are opposite to each other and are staggered in the sleeve (71). Diversion holes (73) are uniformly opened on the surface of the sleeve (71).

8. The digital high-precision single-seat regulating valve according to claim 7, characterized in that: The outer end of the buffer plate (72) is rotatably connected to the inner wall of the sleeve (71). The inner wall of the valve body (1) is provided with an arc-shaped rod (74) that moves freely through the buffer plate (72). An elastic limiting member (75) with its two ends fixed to the outer surface of the buffer plate (72) and the inner wall of the valve body (1) is sleeved on the arc-shaped rod (74).

9. The control method for a digital high-precision single-seat regulating valve according to any one of claims 1-8, characterized in that: First, the single-seat control valve is connected via the Internet. Operators can remotely monitor and control the single-seat control valve through the control system. The control signal is sent to the pneumatic actuator (6) in the single-seat control valve. The pneumatic actuator (6) receives the signal and automatically adjusts the position of the valve seat (2) according to the information parameters in the signal to achieve precise flow control. At the same time, the digital valve positioner (8) in the single-seat control valve can convert the current signal output by the control system into a pneumatic signal to drive the single-seat control valve. According to the friction force of the valve stem (3) when the single-seat control valve is working, the unbalanced force generated by the pressure fluctuation of the medium is offset, so that the valve opening corresponds to the current signal output by the control system. The corresponding parameters can be intelligently configured to improve the performance of the control valve.

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