Pressure dynamic compensation balance valve system and compensation balance method

Abstract

The invention discloses a balance valve system with a dynamic pressure compensation function and a compensation balance method. The balance valve system comprises a main valve and an auxiliary valve which are sequentially installed on a fluid conveying pipeline, and an upstream side, a pressure compensation side and a downstream side which are formed in the fluid conveying direction. The first pressure sensor and the second pressure sensor are in signal transmission connection with the master controller and are respectively used for actually measuring the fluid pressure of the upstream side and the fluid pressure of the pressure compensation side; the main valve has a pressure compensation mechanism controlled by the master controller, the pressure compensation mechanism being able to vary the fluid pressure by pushing or drawing a compensation medium to the pressure compensation side; when the main valve and the auxiliary valve are both closed, the pressure compensation mechanism pushes compensation media to the pressure compensation side so as to improve the fluid pressure of the pressure compensation side till the pressure compensation side and the upstream side at the two ends of the main valve reach the pressure balance state, the sealing performance and reliability of the valve are improved, and safe and stable operation of a fluid conveying system is guaranteed.

Description

Technical Field

[0001] The present invention belongs to the technical field of valves, and in particular relates to a pressure dynamic compensation balancing valve system and a compensation balancing method. Background Art

[0002] In a fluid delivery system, when the valve is closed, the pressure difference between the upstream and downstream often causes the valve plate and the valve seat to not seal tightly, resulting in fluid leakage, affecting the safe and stable operation of the system. Traditional solutions such as optimizing the valve plate and valve seat structure design, or using better sealing materials, although effective, are still difficult to completely solve the sealing problem under high pressure difference conditions, and cannot effectively guarantee the sealing performance and reliability of the valve. Summary of the invention

[0003] Purpose of the invention: In order to overcome the deficiencies in the prior art, the present invention provides a pressure-dynamically compensated balancing valve system and a compensation balancing method, which pushes the compensation medium through the pressure compensation mechanism when the main valve and the auxiliary valve are closed, thereby achieving pressure balance at both ends of the main valve and improving the valve sealing performance and reliability.

[0004] Technical solution: To achieve the above-mentioned purpose, a pressure-dynamically compensated balancing valve system of the present invention comprises a main valve and a sub-valve sequentially installed on a fluid delivery pipeline, forming an upstream side, a pressure compensation side and a downstream side in the fluid delivery direction; it also comprises a main controller and a first pressure sensor connected to the main controller for signal transmission and used to measure the fluid pressure on the upstream side and a second pressure sensor for measuring the fluid pressure on the pressure compensation side; the main valve has a pressure compensation mechanism controlled by the main controller, and the pressure compensation mechanism can change the fluid pressure by pushing or sucking a compensation medium to the pressure compensation side.

[0005] Furthermore, when both the main valve and the auxiliary valve are closed, the pressure compensation mechanism pushes the compensation medium to the pressure compensation side to increase the fluid pressure on the pressure compensation side until the pressure compensation side at both ends of the main valve reaches a pressure balance with the upstream side.

[0006] Furthermore, the compensating medium and the fluid transported in the fluid transport pipeline are the same substance.

[0007] Furthermore, the main valve is a butterfly valve, which also includes a valve body, a valve seat, a valve stem, a valve plate and a rotation drive mechanism; the valve plate is rotatably arranged in the fluid channel of the valve body through the valve stem, so that the outer edge of the valve plate and the inner side of the valve seat can be flexibly contacted to achieve sealing cooperation; the rotation drive mechanism is connected to the valve stem to provide a driving force for the valve plate to perform rotational movement;

[0008] The pressure compensation mechanism includes a compensation medium cylinder, a piston, a push rod and a push-pull driving mechanism; the back flow side of the valve plate is connected to the compensation medium cylinder, so that the compensation medium cylinder is located in the pressure compensation side; the valve stem is a hollow rod body structure that is conductively connected to the compensation medium cylinder, and the push-pull driving mechanism push-pull connects the push rod, and the push rod coaxially passes through the hollow cavity of the valve stem and extends into the compensation medium cylinder to connect the piston slidably arranged in the cylinder, and the side of the compensation medium cylinder is provided with a compensation medium flow hole; the piston is driven by the push-pull driving mechanism to make an axial movement in the compensation medium cylinder to push or suck the compensation medium to change the pressure of the fluid in the pressure compensation side.

[0009] Furthermore, the main valve changes its position relative to the valve seat by rotating the valve plate, including two states: valve opening and valve closing.

[0010] When both the main valve and the auxiliary valve are in the open state, the piston moves upward to suck part of the fluid in the fluid delivery pipeline as the compensation medium and pre-stores it in the compensation medium cylinder;

[0011] When both the main valve and the auxiliary valve are in the closed state, the piston moves downward to push the compensating medium pre-stored in the compensating medium cylinder to the pressure compensation side through the compensating medium flow hole, so that the fluid pressure in the pressure compensation side gradually increases to a state balanced with the upstream side, and the valve plate maintains the stability of the sealing fit with the valve seat through the consistency of the fluid pressure on the upstream side and the back flow side.

[0012] Furthermore, the compensation medium flow holes are located in the lower half of the compensation medium cylinder and are distributed in a circular array on the cylinder side.

[0013] Furthermore, a mounting sleeve with fasteners is provided on the back-flow side of the valve plate, and the mounting sleeve is sleeved on the compensation medium cylinder and fixed by the fasteners.

[0014] Further, the rotation drive mechanism is connected to the master controller so as to control the rotation of the valve plate through the master controller; the rotation drive mechanism comprises a servo reduction motor and a gear transmission assembly, and the servo reduction motor is connected to the valve stem through the gear transmission assembly;

[0015] The push-pull driving mechanism is connected to a master controller so as to control the axial movement of the driving piston through the master controller.

[0016] Furthermore, the auxiliary valve is an electric ball valve controlled by a main controller.

[0017] A compensation balancing method for a pressure dynamic compensation balancing valve system includes a compensation medium pre-sucking stage in an open valve state and a pressure compensation stage in a closed valve state, as follows:

[0018] a) Pre-suction stage of compensating medium in the valve open state

[0019] The main valve and the auxiliary valve are both in the open state, the fluid is normally transported through the fluid delivery pipeline, and the push-pull drive mechanism drives the piston to move in the compensation medium cylinder in the suction direction, extracting part of the fluid as the compensation medium and pre-storing it in the compensation medium cylinder to prepare for the pressure compensation stage in the closed state;

[0020] b) Pressure compensation stage in closed valve state

[0021] When the pressure on the valve plate is too low, the piston will move in the direction of the compensating medium cylinder, and the compensating medium pre-existing in the compensating medium cylinder will be compensated to the pressure compensating side through the compensating medium flow hole. During the pressure compensation process, the first pressure sensor and the second pressure sensor are used to perform real-time pressure detection until the fluid pressure in the pressure compensation side is gradually increased to a state balanced with the upstream side, that is, the pressure on the upstream side of the valve plate is balanced with the pressure on the back side, so that the valve plate can maintain the stability of the sealing fit with the valve seat through the consistency of the fluid pressure on the upstream side and the back side.

[0022] Beneficial effects: The present invention pushes compensation medium to the pressure compensation side when the main valve and the auxiliary valve are closed through the pressure compensation mechanism, thereby achieving pressure balance between the pressure compensation side and the upstream side at both ends of the main valve, effectively solving the problem of poor sealing and easy leakage of the valve plate and valve seat caused by the upstream and downstream pressure difference when the traditional valve is closed, improving the sealing performance and reliability of the valve, and ensuring the safe and stable operation of the fluid delivery system; in addition, the first pressure sensor and the second pressure sensor are used to monitor the fluid pressure on the upstream side and the pressure compensation side in real time, and the pressure compensation mechanism is precisely controlled by the main controller. This dynamic compensation method with real-time data can quickly respond to pressure changes, so that the system always maintains the optimal pressure balance state, and improves the system's automation level and control accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural schematic diagram of a pressure dynamic compensation balancing valve system;

[0024] Figure 2 This is the overall structural diagram of the main valve;

[0025] Figure 3 This is a schematic diagram of the half-section structure of the main valve;

[0026] Figure 4A schematic diagram of the structure of the valve plate, valve stem, rotary drive mechanism and pressure compensation mechanism of the main valve. DETAILED DESCRIPTION

[0027] The present invention will be further described below in conjunction with the accompanying drawings.

[0028] like Figure 1 , Figure 2 as well as Figure 3 As shown, a pressure dynamic compensation balancing valve system includes a main valve 2 and an auxiliary valve 3 installed in sequence on a fluid delivery pipeline 1, forming an upstream side S1, a pressure compensation side S2 and a downstream side S3 in the fluid delivery direction; it also includes a master controller 4 and a first pressure sensor 5 for measuring the fluid pressure of the upstream side S1 and a second pressure sensor 6 for measuring the fluid pressure of the pressure compensation side S2, which are connected to the master controller 4 for signal transmission; the main valve 2 has a pressure compensation mechanism 7 controlled by the master controller 4, and the pressure compensation mechanism 7 can change the fluid pressure by pushing or sucking the compensation medium to the pressure compensation side S2. When the main valve 2 and the auxiliary valve 3 are both closed, the pressure compensation mechanism 7 pushes the compensation medium to the pressure compensation side S2 to increase the fluid pressure of the pressure compensation side S2 until the pressure compensation side S2 at both ends of the main valve 2 reaches a pressure balance state with the upstream side S1. This solution pushes compensation medium to the pressure compensation side S2 when the main valve 2 and the auxiliary valve 3 are closed through the pressure compensation mechanism 7, so as to achieve pressure balance between the pressure compensation side S2 at both ends of the main valve and the upstream side S1, and effectively solves the problem of poor sealing and easy leakage between the valve plate and the valve seat caused by the upstream and downstream pressure difference when the traditional butterfly valve is closed, improves the sealing performance and reliability of the valve, and ensures the safe and stable operation of the fluid delivery system; in addition, the first pressure sensor 5 and the second pressure sensor 6 are used to monitor the fluid pressure of the upstream side S1 and the pressure compensation side S2 in real time, and the pressure compensation mechanism 7 is precisely controlled by the main controller 4. This dynamic compensation method with real-time data can quickly respond to pressure changes, so that the system always maintains the best pressure balance state, and improves the automation level and control accuracy of the system.

[0029] The compensation medium is the same substance as the fluid transported in the fluid transport pipeline 1, which avoids chemical reactions and mutual contamination that may occur between different media, thereby ensuring the purity and safety of the fluid transport system. At the same time, the compensation medium of the same substance will not have an adverse effect on the properties of the fluid and the transport process during the pressure compensation process, thereby ensuring the stable operation of the system and the normal transport of the fluid.

[0030] like Figure 2 , Figure 3 as well as Figure 4As shown, the main valve 2 is a butterfly valve, which also includes a valve body 8, a valve seat 9, a valve stem 10, a valve plate 11 and a rotation drive mechanism 12; the valve plate 11 is rotatably arranged in the fluid channel of the valve body 8 through the valve stem 10, so that the outer edge of the valve plate 11 and the inner side of the valve seat 9 can flexibly contact to achieve sealing cooperation; the rotation drive mechanism 12 is connected to the valve stem 10, and provides a driving force for the valve plate 11 to perform rotational movement. The pressure compensation mechanism 7 includes a compensation medium cylinder 13, a piston 14, a push rod 15 and a push-pull drive mechanism 16; the back flow side of the valve plate 11 is connected to the compensation medium cylinder 13, so that the compensation medium cylinder 13 is located in the pressure compensation side S2; the valve stem 10 is a hollow rod structure connected to the compensation medium cylinder 13, and the push-pull drive mechanism 16 pushes and pulls the push rod 15, and the push rod 15 coaxially passes through the hollow cavity of the valve stem 10 and extends into the compensation medium cylinder 13 to connect the piston 14 slidably arranged in the cylinder, and the side of the compensation medium cylinder 13 is provided with a compensation medium flow hole 130; the piston 14 is driven by the push-pull drive mechanism 16 to perform axial movement in the compensation medium cylinder 13, so as to push or suck the compensation medium to change the pressure of the fluid in the pressure compensation side S2. The combination of the pressure compensation mechanism 7 and the butterfly valve realizes the active adjustment of the fluid pressure of the pressure compensation side S2 when the valve is closed. When the main valve 2 and the auxiliary valve 3 are closed, the compensating medium is pushed by the axial movement of the piston 14 in the compensating medium cylinder 13, so that the fluid pressure on the pressure compensation side S2 gradually increases to balance with the upstream side S1, thereby ensuring the close fit between the valve plate 11 and the valve seat 9, avoiding valve plate deformation and sealing failure caused by pressure difference, and improving the sealing performance and stability of the valve under high pressure difference conditions.

[0031] The main valve 2 changes its position relative to the valve seat 9 by rotating the valve plate 11, including two states: open valve and closed valve.

[0032] When both the main valve 2 and the auxiliary valve 3 are in the open state, the piston 14 moves upward to suck part of the fluid in the fluid delivery pipeline 1 as the compensation medium to be pre-stored in the compensation medium cylinder 13; this function makes full preparations for the pressure compensation stage in the closed valve state, ensures the timely supply of the compensation medium, and avoids the problem of untimely or insufficient pressure compensation due to insufficient compensation medium. By pre-extracting and storing the compensation medium, the response speed of the system and the efficiency of pressure compensation are improved, so that the valve can reach the pressure balance state more quickly.

[0033] When both the main valve 2 and the auxiliary valve 3 are in the closed state, the piston 14 moves downward to push the compensating medium pre-stored in the compensating medium cylinder 13 to the pressure compensation side S2 through the compensating medium flow hole 130, so that the fluid pressure in the pressure compensation side S2 gradually increases to a state balanced with the upstream side S1, and the valve plate 11 maintains the stability of the sealing fit with the valve seat 9 through the consistency of the fluid pressure on the upstream side and the back flow side. This active compensation method of pressure difference effectively eliminates the pressure difference between the upstream side and the back flow side of the valve plate 11, and avoids the problem of reduced sealing stability and fluid leakage between the valve plate 11 and the valve seat 9 caused by the pressure difference. Through pressure compensation, the valve plate 11 can always maintain a close fit with the valve seat 9 in the closed state, which improves the sealing performance and reliability of the valve and extends the service life of the valve.

[0034] The compensation medium flow holes 130 are located in the lower half of the compensation medium cylinder 13 and are distributed in a circumferential array on the cylinder side, so that the compensation medium can be evenly distributed on the pressure compensation side S2 when flowing out of the compensation medium cylinder 13, avoiding the occurrence of excessively high or low local pressure. The flow holes distributed in a circumferential array can also allow the compensation medium to enter the pressure compensation side S2 at a relatively uniform speed and flow rate, thereby improving the uniformity and stability of pressure compensation, helping to achieve more accurate pressure balance control, and further improving the sealing performance and reliability of the valve.

[0035] A mounting sleeve 17 with fasteners is provided on the back flow side of the valve plate 11. The mounting sleeve 17 is sleeved on the compensation medium cylinder 13 and fixed by fasteners. The connection between the compensation medium cylinder 13 and the valve plate 11 is more firm and reliable, avoiding the loosening or falling off of the compensation medium cylinder 13 due to force during the pressure compensation process. The fasteners are preferably screws.

[0036] The rotary drive mechanism 12 is connected to the main controller 4 so as to control the rotation of the valve plate 11 through the main controller 4; the rotary drive mechanism 12 includes a servo reduction motor 121 and a gear transmission assembly 122, and the servo reduction motor 121 is connected to the valve stem 10 through the gear transmission assembly 122. The servo reduction motor 121 has the characteristics of high precision and high response speed, and can quickly and accurately drive the valve plate 11 to rotate according to the instructions of the main controller 4, so as to realize the rapid opening and closing and precise adjustment of the valve. The gear transmission assembly 122 provides a stable transmission ratio and torque output, ensuring the smoothness and reliability of the rotation of the valve plate 11. This precise control method improves the operational flexibility and control accuracy of the valve, meets the requirements for precise adjustment of the valve opening and flow rate under different working conditions, and optimizes the operating efficiency and control effect of the fluid conveying system.

[0037] The push-pull drive mechanism 16 is connected to the master controller 4 to control the axial movement of the driving piston 14 through the master controller 4, so that the axial movement of the piston 14 is more stable and reliable, and the displacement and speed of the piston 14 in the compensation medium cylinder 13 can be accurately controlled according to the pressure signal detected by the pressure sensor and the instruction of the master controller 4. The stable piston drive ensures that the pushing or suction process of the compensation medium is more accurate and smooth, avoids the problems of compensation medium flow fluctuation and inaccurate pressure compensation caused by unstable piston movement, improves the accuracy and stability of pressure compensation, and further optimizes the pressure balance effect and sealing performance of the valve.

[0038] The auxiliary valve 3 is an electric ball valve controlled by the main controller 4. The electric ball valve has the advantages of simple structure, rapid opening and closing, and convenient operation. Through the cooperation of the main controller 4 and the pressure compensation mechanism of the main valve 2, the automatic operation and integrated control of the entire pressure balance valve system can be realized. It should be noted that the auxiliary valve 3 is an auxiliary valve relative to the main valve 2. Through the auxiliary effect of the auxiliary valve 3, the pressure compensation side S2 can easily adjust the pressure in the closed valve state, preventing the pressure loss during the pressure adjustment process from causing low pressure adjustment efficiency or failure.

[0039] A compensation balancing method for a pressure dynamic compensation balancing valve system includes a compensation medium pre-sucking stage in an open valve state and a pressure compensation stage in a closed valve state, as follows:

[0040] a) Pre-suction stage of compensating medium in the valve open state

[0041] Both the main valve 2 and the auxiliary valve 3 are in the open state, and the fluid is normally transported through the fluid delivery pipeline 1. The push-pull drive mechanism 16 drives the piston 14 to move in the suction direction of the compensation medium cylinder 13, and extracts part of the fluid as the compensation medium to be pre-stored in the compensation medium cylinder 13, preparing for the pressure compensation stage in the closed valve state; the operation of this stage provides necessary preparation for the pressure compensation stage in the closed valve state, ensures sufficient supply of compensation medium, avoids the problem of untimely or insufficient pressure compensation due to insufficient compensation medium, and improves the response speed of the system and the efficiency of pressure compensation by pre-extracting and storing the compensation medium, so that the valve can reach the pressure balance state faster, reducing the risk of fluid leakage and valve damage caused by pressure imbalance.

[0042] b) Pressure compensation stage in closed valve state

[0043] The main valve 2 and the auxiliary valve 3 are both in the open valve state, and the delivery of the fluid through the fluid delivery pipeline 1 stops. At this time, the fluid pressure on the pressure compensation side S2 is greater than the fluid pressure on the pressure compensation side S2, that is, the pressure on the upstream side of the valve plate 11 is greater than the pressure on the downstream side. Therefore, a thrust on the valve plate 11 due to the pressure difference will be generated on the upstream side of the valve plate 11. The thrust of the valve plate 11 will cause the stability of the sealing cooperation with the valve seat 9 to decrease, resulting in fluid leakage. In this way, the piston 14 is driven by the push-pull drive mechanism 16 to push the compensation medium cylinder 13 to Directional displacement, the compensating medium pre-stored in the compensating medium cylinder 13 is compensated to the pressure compensation side S2 through the compensating medium flow hole 130. During the pressure compensation process, real-time pressure detection is performed through the first pressure sensor 5 and the second pressure sensor 6 until the fluid pressure in the pressure compensation side S2 gradually increases to a state balanced with the upstream side S1, that is, the pressure on the upstream side of the valve plate 11 is balanced with the pressure on the back-flow side, so that the valve plate 11 maintains the stability of the sealing fit with the valve seat 9 through the consistency of the fluid pressure on the upstream side and the back-flow side. This active compensation method of pressure difference effectively eliminates the pressure difference between the upstream side and the back-flow side of the valve plate 11, and avoids the problem of reduced sealing fit stability and fluid leakage between the valve plate 11 and the valve seat 9 caused by the pressure difference. Through pressure compensation, the valve plate 11 can always maintain a close fit with the valve seat 9 in the closed state, which improves the sealing performance and reliability of the valve, extends the service life of the valve, and ensures the safe and stable operation of the fluid delivery system.

[0044] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A pressure dynamic compensation balancing valve system, characterized in that: The invention comprises a main valve (2) and a secondary valve (3) which are sequentially installed on a fluid conveying pipeline (1), forming an upstream side (S1), a pressure compensation side (S2) and a downstream side (S3) in the fluid conveying direction; and also comprises a main controller (4) and a first pressure sensor (5) for measuring the fluid pressure on the upstream side (S1) and a second pressure sensor (6) for measuring the fluid pressure on the pressure compensation side (S2) which are connected to the main controller (4) for signal transmission; the main valve (2) has a pressure compensation mechanism (7) controlled by the main controller (4), and the pressure compensation mechanism (7) can change the fluid pressure by pushing or sucking a compensation medium to the pressure compensation side (S2).

2. A pressure dynamic compensation balancing valve system according to claim 1, characterized in that: When both the main valve (2) and the auxiliary valve (3) are closed, the pressure compensation mechanism (7) pushes the compensation medium to the pressure compensation side (S2) to increase the fluid pressure of the pressure compensation side (S2) until the pressure compensation side (S2) at both ends of the main valve (2) reaches a pressure balance with the upstream side (S1).

3. A pressure dynamic compensation balancing valve system according to claim 2, characterized in that: The compensating medium and the fluid transported in the fluid transport pipeline (1) are made of the same substance.

4. A pressure dynamic compensation balancing valve system according to claim 3, characterized in that: The main valve (2) is a butterfly valve, which also includes a valve body (8), a valve seat (9), a valve stem (10), a valve plate (11) and a rotation drive mechanism (12); the valve plate (11) is rotatably arranged in the fluid channel of the valve body (8) through the valve stem (10), so that the outer edge of the valve plate (11) and the inner side of the valve seat (9) can flexibly contact to achieve sealing cooperation; the rotation drive mechanism (12) is connected to the valve stem (10) and provides a driving force for the valve plate (11) to perform rotational movement; The pressure compensation mechanism (7) comprises a compensation medium cylinder (13), a piston (14), a push rod (15) and a push-pull drive mechanism (16); the back flow side of the valve plate (11) is connected to the compensation medium cylinder (13), so that the compensation medium cylinder (13) is located in the pressure compensation side (S2); the valve stem (10) is a hollow rod body structure that is conductively connected to the compensation medium cylinder (13); the push-pull drive mechanism (16) pushes and pulls the push rod (15); the push rod (15) coaxially passes through the hollow cavity of the valve stem (10) and extends into the compensation medium cylinder (13) to connect with the piston (14) slidably arranged in the cylinder; the side of the compensation medium cylinder (13) is provided with a compensation medium flow hole (130); the piston (14) is driven by the push-pull drive mechanism (16) to perform axial displacement movement in the compensation medium cylinder (13) to push or suck the compensation medium to change the pressure of the fluid in the pressure compensation side (S2).

5. A pressure dynamic compensation balancing valve system according to claim 4, characterized in that: The main valve (2) changes its position relative to the valve seat (9) by rotating the valve plate (11) to include two states: valve opening and valve closing. When both the main valve (2) and the auxiliary valve (3) are in an open state, the piston (14) moves upward to suck part of the fluid in the fluid delivery pipeline (1) and stores it in the compensation medium cylinder (13) as compensation medium; When both the main valve (2) and the auxiliary valve (3) are in the closed state, the piston (14) moves downward to push the compensating medium pre-stored in the compensating medium cylinder (13) through the compensating medium flow hole (130) to the pressure compensation side (S2), so that the fluid pressure in the pressure compensation side (S2) gradually increases to a state balanced with the upstream side (S1), and the valve plate (11) maintains the stability of the sealing fit with the valve seat (9) through the consistency of the fluid pressure on the upstream side and the back side.

6. A pressure dynamic compensation balancing valve system according to claim 5, characterized in that: The compensating medium flow holes (130) are located in the lower half of the compensating medium cylinder (13) and are distributed in a circumferential array on the side of the cylinder.

7. A pressure dynamic compensation balancing valve system according to claim 4, 5 or 6, characterized in that: A mounting sleeve (17) having a fastener is provided on the back-flow side of the valve plate (11); the mounting sleeve (17) is sleeved on the compensation medium cylinder (13) and fixed by the fastener.

8. A pressure dynamic compensation balancing valve system according to claim 6, characterized in that: The rotary drive mechanism (12) is connected to the master controller (4) so ​​as to drive the valve plate (11) to rotate under the control of the master controller (4); the rotary drive mechanism (12) comprises a servo reduction motor (121) and a gear transmission assembly (122); the servo reduction motor (121) is connected to the valve stem (10) through the gear transmission assembly (122); The push-pull drive mechanism (16) is connected to the master controller (4) so ​​as to control the axial movement of the drive piston (14) through the master controller (4).

9. A pressure dynamic compensation balancing valve system according to claim 8, characterized in that: The auxiliary valve (3) is an electric ball valve controlled by a main controller (4).

10. The compensation balancing method of a pressure dynamic compensation balancing valve system according to claim 9, characterized in that: It includes the pre-suction stage of the compensation medium in the open valve state and the pressure compensation stage in the closed valve state, as follows: a) Pre-suction stage of compensating medium in the valve open state The main valve (2) and the auxiliary valve (3) are both in the open valve state, the fluid is normally transported through the fluid transport pipeline (1), the push-pull drive mechanism (16) drives the piston (14) to move in the compensation medium cylinder (13) in the suction direction, and a part of the fluid is extracted as the compensation medium and pre-stored in the compensation medium cylinder (13), so as to prepare for the pressure compensation stage in the closed valve state; b) Pressure compensation stage in closed valve state The main valve (2) and the auxiliary valve (3) are both in the open valve state, and the delivery of the fluid through the fluid delivery pipeline (1) stops. At this time, the fluid pressure on the pressure compensation side (S2) is greater than the fluid pressure on the pressure compensation side (S2), that is, the pressure on the upstream side of the valve plate (11) is greater than the pressure on the downstream side. Therefore, a thrust on the valve plate (11) is generated from the upstream side of the valve plate (11) due to the pressure difference. The valve plate (11) is subjected to this thrust, which causes the stability of the sealing match with the valve seat (9) to decrease, resulting in fluid leakage. In this way, the piston (14) is driven in the compensation medium cylinder (13) by the push-pull drive mechanism (16). The valve is displaced in the pushing direction, and the compensating medium pre-stored in the compensating medium cylinder (13) is compensated to the pressure compensation side (S2) through the compensating medium flow hole (130). During the pressure compensation process, real-time pressure detection is performed through the first pressure sensor (5) and the second pressure sensor (6) until the fluid pressure in the pressure compensation side (S2) gradually increases to a state balanced with the upstream side (S1), that is, the pressure on the upstream side of the valve plate (11) is balanced with the pressure on the downstream side, thereby allowing the valve plate (11) to maintain the stability of the sealing fit with the valve seat (9) through the consistency of the fluid pressure on the upstream side and the downstream side.

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