A zero-leakage bellows regulating valve pressure balance compensation system and control method thereof

Abstract

The present invention discloses a zero-leakage bellows regulating valve pressure balance compensation system and a control method thereof, the system comprising: an intake pipe, an exhaust pipe and a controller; a first solenoid valve controller and a first solenoid valve are arranged on the intake pipe, the signal input end of the first solenoid valve controller is connected to the first signal output end of the controller via a first proportional amplifier; a second solenoid valve controller and a second solenoid valve are arranged on the exhaust pipe, the signal input end of the second solenoid valve controller is connected to the second signal output end of the controller via a second proportional amplifier; a first pressure sensor and a second pressure sensor are used to measure the pressure of the inner cavity of the bellows and the intake pressure of the main regulating valve respectively; the controller is used to output control signals of the first solenoid valve controller and the second solenoid valve controller. The present invention can solve the technical problems of poor pressure resistance, small application range, short service life, etc. existing in the valve bellows sealing problem.

Description

Technical Field

[0001] The invention belongs to the technical field of fuel regulation and control of gas turbines, and in particular relates to a zero-leakage bellows regulating valve pressure balance compensation system and a control method thereof. Background Art

[0002] The valve with bellows as sealing element is a special valve (explanatory, originally developed for use in nuclear fuel reprocessing plants), and its structural forms mainly include throttle valves, stop valves, regulating valves and pressure reducing valves. When the valve is working, the bellows and the valve stem perform axial displacement and reset together, and at the same time bear the pressure of the fluid. The working pressure of the bellows valve is largely limited by the pressure resistance of the bellows.

[0003] Due to the limitation of pressure bearing capacity, bellows sealed valves are generally only suitable for low-pressure systems. In addition, since the pressure of the fluid flowing through the valve often changes with the working conditions, the bellows that work under the action of alternating external forces for a long time are very easy to be damaged, and the medium leaks, causing serious harm. Moreover, replacing the bellows is a tedious task.

[0004] In the current existing valve sealing design, the use of a single metal bellows seal is a very common method. Due to its poor pressure resistance, it is prone to rupture and has a short service life during use. The existing improved methods mainly include double-layer bellows seals. Although the pressure resistance is enhanced from a physical point of view, it also reduces the fluid flow path in the valve. The improved bellows still cannot meet the actual valve sealing needs. There is an urgent need for a zero-leakage fully sealed bellows with strong pressure resistance and good practicality. Summary of the invention

[0005] The purpose of the present invention is to provide a zero-leakage bellows regulating valve pressure balance compensation system and a control method thereof to solve one or more of the above-mentioned technical problems. Specifically, the present invention can solve the technical problems of the current bellows sealed regulating valve, such as poor pressure resistance, small application range, and short service life.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] A zero-leakage bellows regulating valve pressure balance compensation system provided by the present invention comprises: an intake pipe, an exhaust pipe, a controller, a first proportional amplifier, a first solenoid valve controller, a first solenoid valve, a first pressure sensor, a second proportional amplifier, a second solenoid valve controller, a second solenoid valve and a second pressure sensor;

[0008] The air intake pipe and the exhaust pipe are used to communicate with the bellows in the regulating valve;

[0009] The first solenoid valve and the first solenoid valve controller are arranged on the intake pipe, and the signal input end of the first solenoid valve controller is connected to the first signal output end of the controller via the first proportional amplifier; the second solenoid valve and the second solenoid valve controller are arranged on the exhaust pipe, and the signal input end of the second solenoid valve controller is connected to the second signal output end of the controller via the second proportional amplifier;

[0010] The first pressure sensor and the second pressure sensor are used to measure the pressure of the inner cavity of the bellows and the pressure of the fuel inlet of the regulating valve respectively;

[0011] The controller is used to input the pressure of the inner cavity of the bellows and the pressure of the fuel inlet of the regulating valve; and output control signals of the first solenoid valve controller and the second solenoid valve controller.

[0012] A further improvement of the present invention is that the controller is provided with a comparator;

[0013] The comparator is used to compare the pressure of the inner cavity of the bellows with the pressure of the fuel inlet of the regulating valve.

[0014] A further improvement of the present invention is that the regulating valve comprises a valve body and a valve core;

[0015] Among them, the valve body is provided with a fuel inlet and a fuel outlet; the valve core is movably arranged in the valve body to change the flow area between the fuel inlet and the fuel outlet to achieve valve opening adjustment; the valve core is provided with a bellows for sealing.

[0016] A further improvement of the present invention is that the air intake duct is used to communicate with the outlet of the compressor of the gas turbine.

[0017] A further improvement of the present invention is that the first solenoid valve is replaced by a first one-way throttle valve, and the first solenoid valve controller is removed; the second solenoid valve controller is replaced by a regulating valve continuous controller, and the second solenoid valve is replaced by a balancing regulating valve.

[0018] A further improvement of the present invention is that the first solenoid valve controller is replaced by a regulating valve continuous controller, and the first solenoid valve is replaced by a balancing regulating valve; the second solenoid valve controller is removed, and the second solenoid valve is replaced by a second one-way throttle valve.

[0019] The present invention provides a control method for a zero-leakage bellows regulating valve pressure balance compensation system, comprising the following steps:

[0020] The controller obtains the pressure of the inner cavity of the bellows and the pressure of the fuel inlet of the regulating valve and compares them;

[0021] When the pressure of the fuel inlet of the regulating valve is greater than the pressure of the inner cavity of the bellows, the controller controls the command signal of the air intake pipe of the bellows to be amplified by the first proportional amplifier and then transmitted to the first solenoid valve controller, the first solenoid valve is opened to allow air to enter the air intake pipe, the first pressure sensor feeds back the pressure of the inner cavity of the bellows to the controller, and when the pressure of the inner cavity of the bellows is equal to the main gas pressure of the regulating valve, the controller issues a command to control the closing of the first solenoid valve through the first solenoid valve controller;

[0022] When the pressure of the fuel inlet of the regulating valve is lower than the pressure in the inner cavity of the bellows, the controller controls the command signal of the exhaust pipe of the bellows, which is amplified by the second proportional amplifier and transmitted to the second solenoid valve controller, and the second solenoid valve is opened to exhaust the exhaust pipe. The first pressure sensor feeds back the pressure in the inner cavity of the bellows to the controller. When the pressure in the inner cavity of the bellows is equal to the main gas pressure of the regulating valve, the controller issues a command to control the closing of the second solenoid valve through the second solenoid valve controller.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] In the zero-leakage bellows regulating valve pressure balance compensation system provided by the present invention, an air intake duct and an exhaust duct connected to the bellows are arranged. When the gas turbine is working, high-pressure compressed air can be directly used to resist the pressure exerted on the bellows by the valve working medium to protect the bellows. The pressure balance of the inner and outer surfaces of the bellows can be achieved without providing an additional air source, making the sealing of the bellows safer and more reliable, and achieving the best sealing effect at a low investment cost. The current technical problems of valve bellows sealing, such as poor pressure resistance, small scope of application, and short service life, can be solved.

[0025] In the control method proposed by the present invention, by providing a solenoid valve and a pressure sensor at the air inlet and outlet of the bellows, the high-pressure compressed air during the operation of the gas turbine is directly used to achieve pressure balance and automatic adjustment or control, and a closed loop is formed by the feedback of the pressure sensor in the inner cavity of the bellows; wherein, the controller detects the pressure of the main gas pipeline of the valve, and when the main gas pressure is not equal to the pressure in the bellows, the opening and closing of the inlet and outlet solenoid valves are regulated to control the gas flow entering the bellows and the gas flow discharged from the bellows. When the main gas pressure outside the bellows and the gas pressure inside the bellows are equal, the bellows is almost not affected by pressure and is only used to isolate the main gas pipeline and the gas pipeline inside the bellows, thereby protecting the bellows and extending the service life of the bellows. The control method provided by the present invention can make the bellows seal also applicable to high and medium pressure valves to achieve zero leakage, and is particularly suitable for the regulation of combustible gas in gas turbines. It can also be used for the flow regulation of combustible, toxic, polluting and expensive working fluids in new power cycles such as organic Rankine cycle and Kalina cycle, and has a wide range of application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art; obviously, the drawings described below are some embodiments of the present invention, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0027] Figure 1 It is a schematic diagram of a zero-leakage bellows regulating valve pressure balance compensation system provided by an embodiment of the present invention;

[0028] Figure 2 It is a flow chart of a control method of a zero-leakage bellows regulating valve pressure balance compensation system provided by an embodiment of the present invention;

[0029] Figure 3 It is a schematic diagram of a zero-leakage sealed bellows pressure balance compensation control system model provided by an embodiment of the present invention;

[0030] Figure 4 It is a schematic diagram of a zero-leakage bellows regulating valve pressure balance compensation system according to another embodiment of the present invention;

[0031] Figure 5 It is a schematic diagram of a zero-leakage bellows regulating valve pressure balance compensation system according to another embodiment of the present invention;

[0032] In the figure, 1, first proportional amplifier; 2, second proportional amplifier; 3, first solenoid valve controller; 4, second solenoid valve controller; 5, first solenoid valve; 6, second solenoid valve; 7, first pressure sensor; 8, second pressure sensor;

[0033] 11. Controller; 12. Valve body; 13. Fuel inlet; 14. Fuel outlet; 15. Air intake pipe; 16. Exhaust pipe; 17. Valve core; 18. Bolts; 19. Bellows. DETAILED DESCRIPTION

[0034] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0035] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0036] The present invention is further described in detail below in conjunction with the accompanying drawings:

[0037] See also Figure 1 , a zero-leakage bellows regulating valve pressure balance compensation system provided by an embodiment of the present invention comprises: an intake pipe 15 and an exhaust pipe 16 for communicating with a bellows 19 in the regulating valve;

[0038] Among them, the regulating valve (exemplarily, such as a fuel valve) includes a valve body 12, a fuel inlet 13, a fuel outlet 14, a valve core 17, a bolt 18 and a bellows 19 for sealing; the air inlet pipe 15 of the bellows 19 can be connected to the high-pressure gas (exemplarily, such as the high-pressure air 10 at the compressor outlet of the gas turbine selected in the embodiment of the present invention) to supply air to the bellows 19.

[0039] The working principle of the embodiment of the present invention includes: the air intake pipe and the exhaust pipe in the embodiment of the present invention are not connected to the main air pipe of the regulating valve, which plays a sealing role; the air intake and exhaust circuits are connected on the bellows, and the pressure of the main air channel borne by the bellows is balanced by controlling the air pressure in the bellows, so that the bellows only needs to bear the role of isolating the main air pipe and the gas pipe in the bellows. The biggest innovation of the present invention for gas turbine fuel control is that it uses the high-pressure air of the gas turbine compressor itself to achieve pressure balance of the bellows, which is safe, reliable and convenient, and does not require the addition of other balancing pressure sources.

[0040] See also Figure 2 , the zero leakage sealed bellows pressure balance compensation control provided by the embodiment of the present invention also includes: a controller 11, a proportional amplifier, a solenoid valve controller and a solenoid valve, and a pressure sensor; Figure 2 The block diagram shown also illustrates the concept of the control method of the embodiment of the present invention, which is applicable to the bellows 19 , the intake duct 15 and the exhaust duct 16 .

[0041] When the main gas pressure (for explanation, the main gas flows between the fuel inlet 13 and the fuel outlet 14 of the regulating valve) is greater than the pressure in the inner cavity of the bellows, the controller 11 controls the air intake pipe 15, and the command signal is amplified by the proportional amplifier and transmitted to the solenoid valve on the air intake pipe 15. The solenoid valve opens, and air is taken in at the air intake end of the bellows. The pressure sensor feeds back the pressure in the inner cavity of the bellows to the controller 11. When the pressure in the inner cavity of the bellows is equal to the main gas pressure, the controller 11 issues a command to close the air intake solenoid valve.

[0042] When the main gas pressure is lower than the pressure in the inner cavity of the bellows, the controller 11 controls the exhaust pipe of the bellows 19, and the command signal is amplified by the proportional amplifier and transmitted to the solenoid valve on the exhaust pipe 16. The solenoid valve opens, and the exhaust pipe 16 discharges gas. The pressure sensor feeds back the pressure in the inner cavity of the bellows to the controller 11. When the exhaust port pressure is equal to the main gas pressure, the controller 11 issues a command to close the exhaust port solenoid valve.

[0043] See also Figure 1 and 3 A pressure balance compensation control system matching a bellows sealing structure for a fuel valve provided in an embodiment of the present invention includes: a controller 11, a first proportional amplifier 1, a second proportional amplifier 2, a first solenoid valve controller 3, a second solenoid valve controller 4, a first solenoid valve 5, a second solenoid valve 6, a first pressure sensor 7, a second pressure sensor 8, a bellows 19 and high-pressure air from the compressor outlet.

[0044] Among them, the bellows 19 is installed with a first pressure sensor 7, a first solenoid valve 5, a first solenoid valve controller 3, a high-pressure air duct at the compressor outlet, and a first proportional amplifier 1 in sequence near the air inlet, and the signal input end of the first proportional amplifier 1 is connected to the first output signal end of the controller 11; the bellows 19 is installed with a second pressure sensor 8, a second solenoid valve 6, a second solenoid valve controller 4, and a second proportional amplifier 2 in sequence near the air outlet, and the signal input end of the second proportional amplifier 2 is connected to the second output signal end of the controller 11.

[0045] Specifically explaining the embodiment of the present invention, the controller 11 provided by the embodiment of the present invention has two input signal terminals and three selection output signal terminals. Among them, the first input signal terminal is connected with the signal output terminal of the pressure sensor of the main gas pipeline, and the pressure signal of the main gas pipeline is input to the controller 11; the second input signal terminal is connected with the signal output terminal of the first pressure sensor 7 of the inner cavity of the bellows, and the pressure signal of the inner cavity of the bellows is input to the controller 11; the controller 11 has two selection output signal terminals, when the main gas pressure signal input to the controller 11 is greater than the pressure signal of the inner cavity of the bellows, the first output signal terminal is selected, and the first output signal terminal is connected to the first proportional amplifier 1 of the intake pipe 15, and the first solenoid valve controller 3 of the intake pipe 15 is controlled to open the first solenoid valve 5, and the feedback signal output by the first pressure sensor 7 forms a closed loop with it; when the main gas pressure signal input to the controller 11 is equal to the pressure signal of the inner cavity of the bellows, the controller controls the first solenoid valve to close;

[0046] When the main gas pressure signal input to the controller 11 is less than the pressure signal of the inner cavity of the bellows, the second output signal end is selected, and the second output signal end is connected to the second proportional amplifier 2 of the exhaust pipe 16, and the second solenoid valve controller 4 of the exhaust pipe 16 is controlled to open the second solenoid valve 6, and the feedback signal output by the first pressure sensor 7 in the inner cavity of the bellows forms a closed loop with it; when the main gas pressure signal input to the controller 11 is equal to the pressure signal of the inner cavity of the bellows, the controller controls the exhaust valve to close.

[0047] In the above specific implementation, when a main gas pressure signal is input into the first input signal end of the controller 11, and the main gas pressure signal is greater than the bellows inner cavity pressure signal received at the input end of the controller 11, the first output signal end of the controller 11 is turned on, and the first output signal end transmits the pressure signal to the first proportional amplifier 1 of the intake pipe 15. The signal is amplified and transmitted to the first solenoid valve controller 3. Under the action of the pressure signal, the first solenoid valve controller 3 opens the first solenoid valve 5, and the high-pressure air 10 at the compressor outlet enters the bellows 19. The first pressure sensor 7 feeds back the bellows inner cavity pressure signal to the input signal end. When the feedback pressure signal is equal to the signal at the first output signal end, no pressure difference signal is transmitted to the first proportional amplifier 1, and no current passes through the first solenoid valve controller 3, so that the first solenoid valve 5 is closed. At this time, the pressure in the bellows is equal to the main gas pressure. When a main gas pressure signal is input into the first input signal end of the controller 11, and the main gas pressure signal is less than the first proportional amplifier 1 of the controller 11, the first proportional amplifier 1 of the controller 11 is turned on. When the second signal input end receives the pressure signal of the inner cavity of the bellows, the second output signal end of the controller 11 is turned on, and the second output signal end transmits the pressure signal to the second proportional amplifier 2 of the exhaust pipe 16. The signal is amplified and transmitted to the second solenoid valve controller 4. Under the action of the pressure signal, the second solenoid valve controller 4 opens the second solenoid valve 6, and the air in the bellows 19 is discharged into the atmosphere. The first pressure sensor 7 in the inner cavity of the bellows feeds back the pressure signal of the inner cavity of the bellows to the input signal end. When the feedback pressure signal is equal to the main gas pressure signal, no pressure difference signal is transmitted to the second proportional amplifier 2, and no current passes through the second solenoid valve controller 4, so that the second solenoid valve 6 is closed. At this time, the pressure in the bellows 19 is equal to the main gas pressure; when a main gas pressure signal is input to the first input signal end of the controller 11, and the main gas pressure signal is equal to the pressure signal of the inner cavity of the bellows received by the second signal input end of the controller 11, the controller 11 has no output signal, the solenoid valve controller does not operate, and the solenoid valve is closed.

[0048] See also Figure 4 In a zero-leakage bellows regulating valve pressure balance compensation system provided by an embodiment of the present invention, the first solenoid valve controller is cancelled, and the first solenoid valve 5 is replaced by a first one-way throttle valve, which is a throttle valve and its opening is not controlled. The second solenoid valve controller 4 on the exhaust pipe is changed to a balance regulating valve controller, and the second solenoid valve 6 is changed to a balance regulating valve, which is automatically adjusted according to the main gas pressure of the bellows inner cavity and the regulating valve; the first one-way throttle valve is arranged at the air inlet of the intake pipe.

[0049] See also Figure 5In a zero-leakage bellows regulating valve pressure balance compensation system provided by an embodiment of the present invention, the second solenoid valve controller is cancelled, and the second solenoid valve 6 is replaced by a second one-way throttle valve, which is a throttle valve and its opening is not controlled. The first solenoid valve controller 3 on the intake pipe is changed to a balance regulating valve controller, and the first solenoid valve 5 is changed to a balance regulating valve, which is automatically adjusted according to the main gas pressure of the bellows inner cavity and the regulating valve; the second one-way throttle valve is arranged at the exhaust port of the exhaust pipe.

[0050] When the intake or exhaust pipeline is improved to a one-way valve, the main gas pressure of the regulating valve is compared with the pressure in the inner cavity of the bellows, and the difference is input into the controller. The control signal of the controller is amplified by the proportional amplifier and then transmitted to the reserved intake or exhaust balance regulating valve controller to control the opening of the balance regulating valve, maintain the pressure in the inner cavity of the bellows and the main gas pressure of the regulating valve close to each other, and reach a new balance state. The disadvantage of this improvement is that there is always leakage of compressed air during the working process, which affects the efficiency of the gas turbine.

[0051] In summary, the valve bellows sealing structure provided in the embodiment of the present invention is different from the existing sealing bellows. The bellows is added with an air inlet pipe and an air outlet pipe. When the gas turbine is working, the high-pressure compressed air is directly used to resist the pressure exerted on the bellows by the valve fluid to protect the bellows. The pressure balance between the inner and outer surfaces of the bellows can be achieved without providing an additional air source, making the sealing of the bellows safer and more reliable, and achieving the best sealing effect at a low investment cost. The pressure balance compensation control system matched with the above-mentioned bellows sealing structure of the present invention proposed in the embodiment of the present invention is as follows: the bellows air inlet and outlet are provided with a proportional solenoid valve and a pressure sensor, which directly uses the high-pressure compressed air when the gas turbine is working to achieve pressure balance and automatic adjustment and control, and a closed loop is formed through the feedback of the pressure sensors at the air inlet and outlet. The controller detects the pressure of the valve main gas pipeline. When the main gas pressure is not equal to the pressure inside the bellows, the opening and closing of the proportional solenoid valve of the inlet and outlet ports is regulated, thereby controlling the gas flow entering the bellows and the gas flow discharged from the bellows. When the main gas pressure outside the bellows and the gas pressure inside the bellows are equal, the bellows is almost not affected by pressure and is only used to isolate the main gas pipeline and the gas pipeline inside the bellows, thereby protecting the bellows and extending the service life of the bellows. This control method allows the bellows seal to be applied to high and medium pressure valves to achieve zero leakage, and is particularly suitable for the regulation of combustible gases in gas turbines. It can also be used for the flow regulation of flammable, toxic, polluting and expensive working fluids in new power cycles such as organic Rankine cycle and Kalina cycle, and has broad application prospects.

[0052] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents. Any modification or equivalent replacement that does not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A zero-leakage bellows regulating valve pressure balance compensation system, characterized in that: include: An intake pipe (15), an exhaust pipe (16), a controller (11), a first proportional amplifier (1), a first solenoid valve controller (3), a first solenoid valve (5), a first pressure sensor (7), a second proportional amplifier (2), a second solenoid valve controller (4), a second solenoid valve (6) and a second pressure sensor (8); The air intake pipe (15) and the air exhaust pipe (16) are used to communicate with the bellows in the regulating valve; The intake pipe (15) is provided with the first solenoid valve (5) and a first solenoid valve controller (3), and the signal input end of the first solenoid valve controller (3) is connected to the first signal output end of the controller (11) via the first proportional amplifier (1); the exhaust pipe (16) is provided with the second solenoid valve (6) and a second solenoid valve controller (4), and the signal input end of the second solenoid valve controller (4) is connected to the second signal output end of the controller (11) via the second proportional amplifier (2); The first pressure sensor (7) and the second pressure sensor (8) are used to measure the pressure of the inner cavity of the bellows and the pressure of the fuel inlet of the regulating valve respectively; The controller (11) is used to input the pressure of the inner cavity of the bellows and the pressure of the fuel inlet of the regulating valve; and output control signals of the first solenoid valve controller (3) and the second solenoid valve controller (4).

2. A zero-leakage bellows regulating valve pressure balance compensation system according to claim 1, characterized in that: The controller (11) is provided with a comparator; The comparator is used to compare the pressure of the inner cavity of the bellows with the pressure of the fuel inlet of the regulating valve.

3. A zero-leakage bellows regulating valve pressure balance compensation system according to claim 1, characterized in that: The regulating valve comprises a valve body (12) and a valve core (17); The valve body (12) is provided with a fuel inlet (13) and a fuel outlet (14); the valve core (17) is movably arranged in the valve body (12) for changing the flow area between the fuel inlet (13) and the fuel outlet (14) to achieve valve opening adjustment; and a bellows for sealing is arranged on the valve core (17).

4. A zero-leakage bellows regulating valve pressure balance compensation system according to claim 1, characterized in that: The air intake pipe (15) is used to communicate with the outlet of the compressor of the gas turbine.

5. A zero-leakage bellows regulating valve pressure balance compensation system according to claim 1, characterized in that: The first solenoid valve (5) is replaced by a first one-way throttle valve, and the first solenoid valve controller (3) is removed; the second solenoid valve controller (4) is replaced by a regulating valve continuous controller, and the second solenoid valve (6) is replaced by a balancing regulating valve.

6. A zero-leakage bellows regulating valve pressure balance compensation system according to claim 1, characterized in that: The first solenoid valve controller (3) is replaced by a regulating valve continuous controller, and the first solenoid valve (5) is replaced by a balancing regulating valve; the second solenoid valve controller (4) is removed, and the second solenoid valve (6) is replaced by a second one-way throttle valve.

7. A control method for a zero-leakage bellows regulating valve pressure balance compensation system according to claim 1, characterized in that: The following steps are involved: The controller (11) obtains the pressure of the inner cavity of the bellows and the pressure of the fuel inlet of the regulating valve and compares them; When the pressure of the fuel inlet of the regulating valve is greater than the pressure of the inner cavity of the bellows, the controller (11) controls the command signal of the air intake pipe (15) of the bellows to be amplified by the first proportional amplifier (1) and then transmitted to the first solenoid valve controller (3), the first solenoid valve controller (3) opens the first solenoid valve (5) to allow air to enter the air intake pipe (15), the first pressure sensor (7) feeds back the pressure of the inner cavity of the bellows to the controller (11), and when the pressure of the inner cavity of the bellows is equal to the main gas pressure of the regulating valve, the controller (11) issues a command to control the closing of the first solenoid valve (5) through the first solenoid valve controller (3); When the pressure of the fuel inlet of the regulating valve is lower than the pressure of the inner cavity of the bellows, the controller (11) controls the command signal of the exhaust pipe (16) of the bellows to be amplified by the second proportional amplifier (2) and then transmitted to the second solenoid valve controller (4), thereby opening the second solenoid valve (6) to exhaust the exhaust pipe (16). The first pressure sensor (7) feeds back the pressure of the inner cavity of the bellows to the controller (11). When the pressure of the inner cavity of the bellows is equal to the main gas pressure of the regulating valve, the controller (11) issues a command to control the closing of the second solenoid valve (6) through the second solenoid valve controller (4).

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