Balanced quick response self-locking valve and working method

Abstract

The application discloses a balanced quick-response self-locking valve and a working method, and solves the problems of slow opening response speed and low reliability of a self-locking valve in the prior art. The application comprises a valve body and a pilot valve. The valve body is a three-way valve body, and a balanced movement rod is arranged in the valve body. The pilot valve is connected to the valve body through an adapter disc. A piston cavity is formed between the pilot valve, the adapter disc and an outlet channel B of the valve body. A piston is arranged in the piston cavity in a floating manner. The piston is fixed to the top of the balanced movement rod. The balanced movement rod passes through the outlet channel B and an inlet channel of the valve body and corresponds to an outlet channel A of the valve body. A double-valve core assembly is arranged at the bottom of the balanced movement rod. The application introduces medium into the piston cavity through two balanced cavities. Because the upper and lower action areas of the piston are different, the medium forces are different, a pressure difference is generated, the piston is driven to move through the pressure difference, and then the double-valve core assembly is enabled to quickly open and close the outlet, quick response is realized, the reliability of the self-locking valve is improved, and the effective operation of the whole system is ensured.

Description

Technical Field

[0001] This invention relates to the field of self-locking valve technology, and in particular to a balanced fast-response self-locking valve and its working method. Background Technology

[0002] With the rapid development of the defense industry, the demand for fast-response self-locking valves is increasing. As an important control component in fluid transport systems and an actuator for automated fluid control, a two-position three-way self-locking valve has one inlet and two outlets, A and B. When fluid needs to be discharged from port B, the pilot valve of the self-locking valve opens, port B opens, and port A closes; when fluid needs to be discharged from port A, the pilot valve of the self-locking valve closes, port A opens, and port B closes, achieving a two-position three-way function. In certain specialized fields, the closing response of the self-locking valve is required to be extremely high. However, current self-locking valves typically utilize a spring return mechanism that drives a piston to push a balance rod to achieve valve self-locking. Often, the spring fails to return to its original position, or the spring force is less than the hydraulic force, causing the piston to jam. Increasing the spring force, on the other hand, slows down the valve's opening response speed. This prevents the self-locking valve from achieving optimal opening and closing response times, affecting the effective operation of the entire system.

[0003] Chinese patent CN113757388A discloses a pilot-operated high-pressure self-locking valve, which includes a main valve and a pilot valve. The pilot valve is connected to the valve body, and a gas is introduced into the pilot valve for pressure regulation. However, the gas introduced into the pilot valve is only used as a control medium to control the pilot valve. In principle, hydraulic balance cannot be achieved, thus the rapid response of the self-locking valve cannot be achieved.

[0004] Chinese patent CN109695770A discloses a simple, highly reliable self-locking valve, comprising a valve body assembly, a spring, a valve seat, and an armature assembly. It employs a fully welded structure, achieving a lightweight design. The armature has radially opened through holes, but these only serve as a medium flow channel and have no other regulating function. Therefore, it cannot achieve a rapid response from the self-locking valve. Summary of the Invention

[0005] To address the shortcomings in the aforementioned background technology, this invention proposes a balanced fast-response self-locking valve and its operating method, which solves the problems of slow opening response speed and low reliability of self-locking valves in the prior art.

[0006] The technical solution of the present invention is implemented as follows: a balanced fast-response self-locking valve includes a valve body and a pilot valve. The valve body is a three-way valve body, and a balanced motion rod is provided inside the valve body. The pilot valve is connected to the valve body through an adapter plate. A piston chamber is formed between the pilot valve, the adapter plate, and the outlet channel B of the valve body. A floating piston is provided in the piston chamber. The piston is fixed to the top of the balanced motion rod. The balanced motion rod passes through the outlet channel B and the inlet channel of the valve body and corresponds to the outlet channel A of the valve body. A dual valve core assembly for controlling the opening and closing of the outlet channel A and the outlet channel B is provided at the bottom of the balanced motion rod.

[0007] The balance motion rod is provided with a balance chamber structure I that connects the inlet channel and the piston chamber. The pilot valve is connected to the inlet channel through a connecting pipe, and the adapter plate is provided with a balance chamber structure II that connects the piston chamber and the pilot valve. The medium forms a pressure difference in the piston chamber through the balance chamber structure I and the balance chamber structure II. The movement of the balance motion rod and the double valve core assembly is controlled by the pressure difference, thereby controlling the opening and closing of the outlet channel A and the outlet channel B.

[0008] The dual valve core assembly includes an upper valve core assembly corresponding to outlet channel B and a lower valve core assembly corresponding to outlet channel A. The upper valve core assembly and the lower valve core assembly are connected by a connecting sleeve and are both fixed on the balance motion rod.

[0009] O-rings I are provided between the upper valve core assembly and the balance motion rod, and between the lower valve core assembly and the balance motion rod. A limiting platform is provided on the balance motion rod to limit the upper valve core assembly. The lower valve core assembly is fixed on the balance motion rod by a locking nut. A first hole is provided on the connecting sleeve to communicate with the balance chamber structure I and the inlet channel.

[0010] The piston chamber is divided into an upper piston chamber and a lower piston chamber by the piston. The upper and lower piston chambers have different working areas. The balance chamber structure I is connected to the lower piston chamber and the balance chamber structure II is connected to the upper piston chamber.

[0011] The balance chamber structure I includes a communicating balance chamber, a lower radial hole, and an upper radial hole. The balance chamber is arranged along the central axis of the balance motion rod. The lower radial hole and the upper radial hole are respectively arranged at the upper and lower parts of the balance motion rod. The lower radial hole corresponds to the inlet channel, and the upper radial hole corresponds to the lower piston chamber. The outer wall of the balance motion rod is provided with annular grooves corresponding to the lower radial hole and the upper radial hole, respectively.

[0012] The balance chamber structure II includes a lateral discharge channel, an axial hole I, and an axial hole II. The axial hole II is arranged along the central axis of the adapter plate and is connected to the pilot valve and the lateral discharge channel. The axial hole I is eccentrically arranged and is connected to the pilot valve and the upper piston chamber.

[0013] The outlet of the outlet channel A is detachably equipped with an outlet connector. A sealing ring II is provided between the outlet connector and the valve body. A bracket is provided inside the outlet connector. A bushing for limiting the balance movement rod is provided at the center of the bracket. The balance movement rod and the bushing are in sliding fit.

[0014] The piston is fixed to the top of the balance rod by a locking nut, and sealing rings III and IV are provided between the piston and the valve body; a spring sleeved on the balance rod is provided between the piston and the outer wall of the outlet channel B; sealing ring V is provided between the balance rod and the outer wall of the outlet channel B.

[0015] The pilot valve is connected to the adapter plate by bolts, and a sealing element I is provided between the pilot valve and the adapter plate. The adapter plate is connected to the valve body by bolts, and a sealing element II is provided between the adapter plate and the valve body.

[0016] A method for operating the aforementioned balanced fast-response self-locking valve: When the self-locking valve opening coil is energized, the medium enters the inlet channel through the inlet, and then a portion of the medium enters the pilot valve through the connecting pipe, opening the pilot valve; the medium enters the upper piston chamber of the piston chamber, generating a positive medium force on the piston; another portion of the medium enters the lower piston chamber of the piston chamber through the balance chamber structure I on the balance motion rod, generating a reverse medium force on the piston. When the positive medium force is greater than the reverse medium force, a positive pressure difference is generated, which then drives the dual valve core assembly to move downward through the piston and the balance motion rod. The lower valve core assembly of the dual valve core assembly seals the outlet channel A, while the upper valve core assembly of the dual valve core assembly disengages from the outlet channel B, opening the outlet channel B;

[0017] When the locking coil of the self-locking valve is energized, the pilot valve is closed, and the medium in the inlet channel enters the lower piston chamber of the piston chamber through the balance chamber structure I on the balance motion rod, generating a reverse medium force on the piston. When the reverse medium force is greater than the forward medium force, a reverse pressure difference is generated, and the medium in the upper piston chamber is discharged through the balance chamber structure II, pushing the piston to move upward rapidly. The lower valve core assembly of the dual valve core assembly disengages from the outlet channel A, and the outlet channel A opens. At the same time, the upper valve core assembly of the dual valve core assembly seals the outlet channel B, and the outlet channel B closes.

[0018] Among them, the forward pressure difference is defined as the opening force, and the reverse pressure difference is defined as the closing force;

[0019] Then there is ; ;

[0020] In the formula: To open the force, For closing force, For inlet pressure, The radius of the piston's upper end face. The radius of the piston's lower end face. To balance the radius of the moving rod, For the weight of the parts, For spring force, This is friction.

[0021] The beneficial effects of this invention are as follows: 1. This invention introduces the medium into the piston chamber through a two-balance chamber structure. Due to the different acting areas of the piston, the medium forces are different, generating a pressure difference. This pressure difference drives the piston to move, thereby realizing the rapid opening and closing of the outlet channels A and B by the dual valve core assembly, achieving rapid response, improving the reliability of the self-locking valve, and ensuring the effective operation of the entire system. 2. Through multidisciplinary derivation using mechanics, fluid mechanics, and elastoplastic mechanics, the balance chamber of this self-locking valve can balance the influence of the hydraulic force within the self-locking valve on the valve's action response time. When the pilot valve opens, the hydraulic force balance within the piston chamber is quickly achieved through the balance chamber, offsetting the influence of the hydraulic force on the opening and closing of the valve, allowing the valve to open quickly with only a small spring force. When the pilot valve closes, the pressure balance within the piston chamber is quickly broken through the lateral discharge channel, pushing the balance rod to move rapidly, achieving rapid response. 3. This invention is a two-position three-way valve with a compact overall structure. The self-locking valve can be externally connected to a corresponding system through the outlet connector, exhibiting high applicability and flexibility, and possessing high market value and promotional value. Attached Figure Description

[0022] To more clearly illustrate the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the overall internal structure of the present invention.

[0024] Figure 2 This is a schematic diagram of the internal structure of the balancing motion rod of the present invention.

[0025] Figure 3 This is a schematic diagram of the internal structure of the adapter plate of the present invention.

[0026] Figure 4 This is a schematic diagram of the internal structure of the dual valve core assembly of the present invention.

[0027] Figure 5 This is a schematic diagram of the outlet connector structure of the present invention.

[0028] Figure 6 This is a schematic diagram showing the outlet channel A in the open state after the pilot valve is removed according to the present invention. Detailed Implementation

[0029] 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.

[0030] like Figure 1 As shown in Embodiment 1, a balanced fast-response self-locking valve includes a valve body 6 and a pilot valve 1. The valve body 6 is a three-way valve body, comprising one inlet and two outlets, corresponding to the inlet channel, outlet channel A, and outlet channel B. A balancing motion rod 7 is provided within the valve body 6, allowing movement within the valve body. The pilot valve 1 is connected to the valve body 6 via an adapter plate 2, forming a piston chamber between the pilot valve 1, the adapter plate 2, and the outlet channel B of the valve body. This piston chamber is a sealed chamber. A floating piston 17 is provided within the piston chamber, fixed to the top of the balancing motion rod 7. The lower part of the balancing motion rod 7 passes sequentially through the outlet channel B and the inlet channel of the valve body, corresponding to the outlet channel A. A dual-valve core assembly controlling the opening and closing of outlet channels A and B is provided at the bottom of the balancing motion rod 7; under the action of the dual-valve core assembly, outlet channel A is open and outlet channel B is closed, or outlet channel A is closed and outlet channel B is open.

[0031] In this embodiment, the balance rod 7 has a balance chamber structure I that connects the inlet channel and the piston chamber. The pilot valve 1 is connected to the inlet channel via a connecting pipe 19. Specifically, one end of the connecting pipe 19 is welded to the inlet end of the valve body 6, and the other end is connected to the inlet of the pilot valve 1, ensuring that the medium enters the pilot valve 1 through the inlet channel. The adapter plate 2 has a balance chamber structure II that connects the piston chamber and the pilot valve 1. The balance chamber structure II can communicate with the outside. The medium forms a pressure difference in the piston chamber through the balance chamber structure I and the balance chamber structure II. This pressure difference controls the movement of the balance rod 7 and the dual valve core assembly, thereby controlling the opening and closing of the outlet channel A and the outlet channel B, achieving rapid response.

[0032] Example 2: Based on Example 1, this example makes the following improvements:

[0033] In this embodiment, the dual valve core assembly includes an upper valve core assembly 8 corresponding to outlet channel B and a lower valve core assembly 14 corresponding to outlet channel A. The upper valve core assembly 8 and the lower valve core assembly 14 are connected by a connecting sleeve 15 and are both fixed on the balance motion rod 7. As a preferred embodiment, the upper valve core assembly 8, the connecting sleeve 15, and the lower valve core assembly 14 are fitted onto the balance motion rod 7, and the three are welded together to form a welded joint. The movement of the balance motion rod 7 simultaneously drives the movement of the three components, resulting in strong synchronization.

[0034] In this preferred embodiment, O-rings Ⅰ9 are provided between the upper valve core assembly 8 and the balance movement rod 7, and between the lower valve core assembly 14 and the balance movement rod 7, to improve the overall sealing performance. A limiting platform 231 is provided on the balance movement rod 7 to limit the upper valve core assembly 8. The lower valve core assembly 14 is fixed to the balance movement rod 7 by a locking nut 11. The limiting platform 231 and the locking nut cooperate to achieve both precise installation and detachment of the welded component. A pressure plate 10 is provided between the locking nut and the lower valve core assembly 14. The connecting sleeve 15 has a first hole 24 communicating with the balance chamber structure Ⅰ and the inlet channel. The medium in the inlet channel enters the balance chamber structure Ⅰ through the first hole.

[0035] Further improvements: such as Figure 4 As shown, the piston chamber is divided into an upper piston chamber 25 and a lower piston chamber 26 by piston 17. The upper and lower working areas of the piston are different. The balance chamber structure I is connected to the lower piston chamber 26. The medium can enter the lower piston chamber 26 through the balance chamber structure I, and the balance chamber structure II is connected to the upper piston chamber 25. The medium can enter the upper piston chamber 25 through the balance chamber structure II. Due to the different working areas of the piston, the medium can generate positive and negative medium forces of different magnitudes. When the positive medium force is greater than the negative medium force, the piston overcomes the force of the spring 5 between piston 17 and the outer wall of the outlet channel B, causing the piston and the balance rod to move downward. When the positive medium force is less than the negative medium force, the piston and the balance rod move upward under the action of the spring 5 and the negative medium force.

[0036] like Figure 2 As shown, the balance chamber structure I in this embodiment includes a communicating balance chamber 71, a lower radial hole 72, and an upper radial hole 73. The balance chamber 71 is arranged along the central axis of the balance motion rod 7. The lower radial hole 72 and the upper radial hole 73 are respectively arranged on the upper and lower parts of the balance motion rod 7 and are both arranged radially. The lower radial hole 72 corresponds to the inlet channel, and the upper radial hole 73 corresponds to the lower piston chamber 26. That is, the medium in the inlet channel enters the balance chamber 71 through the lower radial hole 72, and then enters the lower piston chamber 26 through the upper radial hole 73, thereby achieving hydrodynamic balance in the piston chamber. The outer wall of the balance motion rod 7 is provided with annular grooves 74 corresponding to the lower radial hole 72 and the upper radial hole 73, respectively, to facilitate the inflow and outflow of the medium.

[0037] As a preferred option, such as Figure 3As shown, the balance chamber structure II includes a lateral discharge channel 21, an axial hole I 22, and an axial hole II 23. The axial hole II 23 is arranged along the central axis of the adapter plate 2 and is connected to the pilot valve 1 and the lateral discharge channel 21. One end of the lateral discharge channel 21 is connected to the axial hole II 23, and the other end can be connected to the outside. The axial hole I 22 is eccentrically arranged and is connected to the pilot valve 1 and the upper piston chamber 25. When the pilot valve is energized and opened, the pilot valve core disengages from the axial hole I 22, and the medium enters the upper piston chamber through the axial hole I. When the pilot valve is de-energized and closed, the medium in the upper piston chamber enters the gap between the axial hole I and the axial hole II through the axial hole I, then enters the axial hole II through the gap, and then flows to the outside through the lateral discharge channel. When pilot valve 1 is closed, the inlet gas (medium) cannot enter the pilot valve through connecting pipe 19. The gas above the piston chamber is discharged into the atmosphere through the side vent of the adapter plate 2 (lateral discharge channel 21). The pressure in the upper piston chamber is low. The pressure difference between the upper and lower chambers, along with the action of the return spring, pushes piston 17 to drive the balance rod 7 upward. The outlet channel A opens, and the outlet channel B closes. That is, when the locking coil is energized and locked, the medium in the piston chamber is quickly discharged into the atmosphere, and the pressure balance between the upper and lower chambers is quickly broken, pushing the balance rod to move rapidly, achieving a rapid response.

[0038] In this embodiment, an outlet connector 12 is detachably provided at the outlet of the outlet channel A. The outlet connector 12 is connected to the outlet of the outlet channel A by flange bolts. A sealing ring II 13 is provided between the outlet connector 12 and the valve body 6. The sealing ring II 13 can be an O-ring. A bracket 12-1 is provided inside the outlet connector 12. A bushing 12-2 for limiting the balance movement rod 7 is provided at the center of the bracket 12-1. The balance movement rod 7 slides with the bushing 12-2, which guides the balance movement rod and ensures that the balance movement rod 7 performs stable up and down reciprocating motion.

[0039] As a further preferred embodiment, the piston 17 is fixed to the top of the balance rod 7 by a locking nut 11. A pressure plate is provided between the locking nut and the piston 17, and sealing rings III 16 and IV 18 are provided between the piston 17 and the valve body 6, forming a double seal to improve the sealing effect. Both sealing rings III 16 and IV 18 can be O-rings, achieving a sliding seal between the piston 17 and the valve body 6. A spring 5, sleeved on the balance rod 7, is provided between the piston 17 and the outer wall of the outlet channel B. The upper part of the spring 5 is guided by the piston 17, and the lower part is guided by the valve body 6, ensuring that the spring 5 does not shift or bend. A sealing ring V 27 is provided between the balance rod 7 and the outer wall of the outlet channel B. Sealing ring V can be an O-ring, improving the sealing performance between the balance rod 7 and the outlet channel B.

[0040] like Figure 5As shown, in this embodiment, the pilot valve 1 is connected to the adapter plate 2 by bolts, and a sealing element I3 is provided between the pilot valve 1 and the adapter plate 2. The adapter plate 2 is connected to the valve body 6 by bolts, and a sealing element II4 is provided between the adapter plate 2 and the valve body 6. Specifically, the pilot valve 1 and the adapter plate 2 are connected by a flange with hexagon socket head cap screws 22 and sealed with an O-ring 3, and the adapter plate 2 and the valve body 6 are connected by a flange with hexagon socket head cap bolts 21 and nuts 20 and sealed with an O-ring 5.

[0041] Example 3: A working method of a balanced fast-response self-locking valve as described in Example 2, taking gas as the medium: When the self-locking valve opening coil is energized, the medium enters the inlet channel through the inlet, and then part of the medium enters the pilot valve 1 through the connecting pipe 19, opening the pilot valve; the medium enters the upper piston chamber 25 of the piston chamber, generating a positive medium force on the piston 17; another part of the medium enters the lower piston chamber 26 of the piston chamber through the balance chamber structure I on the balance motion rod 7, generating a reverse medium force on the piston 17. When the positive medium force is greater than the reverse medium force, a positive pressure difference is generated. Forward pressure difference Overcoming the upward force of the spring, the piston 17 and the balance rod 7 drive the double valve core assembly to move downward. The lower valve core assembly 14 of the double valve core assembly seals the outlet channel A, while the upper valve core assembly 8 of the double valve core assembly disengages from the outlet channel B, and the outlet channel B opens.

[0042] When the locking coil of the self-locking valve is energized, the pilot valve 1 closes, and the inlet gas cannot enter the pilot valve through the connecting pipe; the gas in the upper piston chamber is discharged into the atmosphere through the exhaust channel (side exhaust channel 21) of the transfer plate, the pressure in the upper piston chamber decreases, and the medium in the inlet channel enters the lower piston chamber 26 of the piston chamber through the balance chamber structure I on the balance movement rod 7, generating a reverse medium force on the piston 17. When the reverse medium force is greater than the forward medium force, a reverse pressure difference is generated. The medium in the upper piston chamber 25 is discharged through the balance chamber structure II, with a reverse pressure difference. The spring pushes the piston 17 to move rapidly upward, and the lower valve core assembly 14 of the dual valve core assembly disengages from the outlet channel A, opening the outlet channel A. Figure 6 As shown, at the same time, the upper valve core assembly 8 of the dual valve core assembly seals the outlet channel B, and the outlet channel B is closed.

[0043] Among them, the forward pressure difference is defined as the opening force, and the reverse pressure difference is defined as the closing force;

[0044] Then there is ; ;

[0045] In the formula: To open the force, For closing force, For inlet pressure, The radius of the piston's upper end face. The radius of the piston's lower end face. To balance the radius of the moving rod, For the weight of the parts, For spring force, This is friction.

[0046] The piston of this invention has different working areas on the top and bottom, resulting in different media forces and generating a pressure difference. The piston moves through the pressure difference, thereby enabling the dual valve core assembly to quickly open and close the outlet channels A and B, achieving rapid response, improving the reliability of the self-locking valve, and ensuring the effective operation of the entire system.

[0047] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A balanced fast-response self-locking valve, comprising a valve body (6) and a pilot valve (1), characterized in that: The valve body (6) is a three-way valve body, and a balance movement rod (7) is provided inside the valve body (6); the pilot valve (1) is connected to the valve body (6) through the adapter plate (2), and a piston chamber is formed between the pilot valve (1), the adapter plate (2) and the outlet channel B of the valve body. A floating piston (17) is provided in the piston chamber. The piston (17) is fixed on the top of the balance movement rod (7). The balance movement rod (7) passes through the outlet channel B and the inlet channel of the valve body and corresponds to the outlet channel A of the valve body. A double valve core assembly for controlling the opening and closing of the outlet channel A and the outlet channel B is provided at the bottom of the balance movement rod (7); the piston chamber is divided into an upper piston chamber (25) and a lower piston chamber (26) through the piston (17). The upper and lower pistons have different working areas. The balance chamber structure I is connected to the lower piston chamber (26), and the balance chamber structure II is connected to the upper piston chamber (25); a spring (5) is provided between the piston (17) and the outer wall of the outlet channel B and sleeved on the balance movement rod (7). The balance motion rod (7) is provided with a balance chamber structure I that connects the inlet channel and the piston chamber. The pilot valve (1) is connected to the inlet channel through the connecting pipe (19), and the adapter plate (2) is provided with a balance chamber structure II that connects the piston chamber and the pilot valve (1). The medium forms a pressure difference in the piston chamber through the balance chamber structure I and the balance chamber structure II. The movement of the balance motion rod (7) and the double valve core assembly is controlled by the pressure difference, thereby controlling the opening and closing of the outlet channel A and the outlet channel B.

2. The balanced fast-response self-locking valve according to claim 1, characterized in that: The dual valve core assembly includes an upper valve core assembly (8) corresponding to the outlet channel B and a lower valve core assembly (14) corresponding to the outlet channel A. The upper valve core assembly (8) and the lower valve core assembly (14) are connected by a connecting sleeve (15) and are both fixed on the balance motion rod (7).

3. The balanced fast-response self-locking valve according to claim 2, characterized in that: O-rings I (9) are provided between the upper valve core assembly (8) and the balance motion rod (7) and between the lower valve core assembly (14) and the balance motion rod (7). A limiting platform (231) for limiting the upper valve core assembly (8) is provided on the balance motion rod (7). The lower valve core assembly (14) is fixed on the balance motion rod (7) by a locking nut (11). A first hole (24) is provided on the connecting sleeve (15) that communicates with the balance chamber structure I and the inlet channel.

4. The balanced fast-response self-locking valve according to any one of claims 1 to 3, characterized in that: The balance chamber structure I includes a communicating balance chamber (71), a lower radial hole (72) and an upper radial hole (73). The balance chamber (71) is arranged along the central axis of the balance motion rod (7). The lower radial hole (72) and the upper radial hole (73) are respectively arranged on the upper and lower parts of the balance motion rod (7). The lower radial hole (72) corresponds to the inlet channel and the upper radial hole (73) corresponds to the lower piston chamber (26). The outer wall of the balance motion rod (7) is provided with annular grooves (74) corresponding to the lower radial hole (72) and the upper radial hole (73) respectively.

5. The balanced fast-response self-locking valve according to claim 4, characterized in that: The balance chamber structure II includes a lateral discharge channel (21), an axial hole I (22) and an axial hole II (23). The axial hole II (23) is arranged along the central axis of the adapter plate (2) and is connected to the pilot valve (1) and the lateral discharge channel (21). The axial hole I (22) is eccentrically arranged and is connected to the pilot valve (1) and the upper piston chamber (25).

6. The balanced fast-response self-locking valve according to any one of claims 1 to 3 and 5, characterized in that: The outlet of the outlet channel A is detachably provided with an outlet connector (12), and a sealing ring II (13) is provided between the outlet connector (12) and the valve body (6). A bracket (12-1) is provided inside the outlet connector (12), and a bushing (12-2) for limiting the balance movement rod (7) is provided at the center of the bracket (12-1). The balance movement rod (7) and the bushing (12-2) are in sliding fit.

7. The balanced fast-response self-locking valve according to claim 6, characterized in that: The piston (17) is fixed to the top of the balance motion rod (7) by a locking nut (11), and a sealing ring III (16) and a sealing ring IV (18) are provided between the piston (17) and the valve body (6); a sealing ring V (27) is provided between the balance motion rod (7) and the outer wall of the outlet channel B.

8. The balanced fast-response self-locking valve according to claim 7, characterized in that: The pilot valve (1) is connected to the adapter plate (2) by bolts and a sealing element I (3) is provided between the pilot valve (1) and the adapter plate (2). The adapter plate (2) is connected to the valve body (6) by bolts and a sealing element II (4) is provided between the adapter plate (2) and the valve body (6).

9. A method for operating a balanced fast-response self-locking valve as described in claim 1, characterized in that: When the self-locking valve is energized, the medium enters the inlet channel through the inlet, and then part of the medium enters the pilot valve (1) through the connecting pipe (19), and the pilot valve opens; the medium enters the upper piston chamber (25) of the piston chamber, generating a positive medium force on the piston (17); another part of the medium enters the lower piston chamber (26) of the piston chamber through the balance chamber structure I on the balance motion rod (7), generating a reverse medium force on the piston (17). When the positive medium force is greater than the reverse medium force, a positive pressure difference is generated, and then the piston (17) and the balance motion rod (7) drive the double valve core assembly to move downward. The lower valve core assembly (14) of the double valve core assembly seals the outlet channel A, and at the same time, the upper valve core assembly (8) of the double valve core assembly disengages from the outlet channel B, and the outlet channel B opens. When the locking coil of the self-locking valve is energized, the pilot valve (1) is closed, and the medium in the inlet channel enters the lower piston chamber (26) of the piston chamber through the balance chamber structure I on the balance motion rod (7), generating a reverse medium force on the piston (17). When the reverse medium force is greater than the forward medium force, a reverse pressure difference is generated, and the medium in the upper piston chamber (25) is discharged through the balance chamber structure II, and pushes the piston (17) to move upward rapidly. The lower valve core assembly (14) of the double valve core assembly disengages from the outlet channel A, and the outlet channel A is opened. At the same time, the upper valve core assembly (8) of the double valve core assembly seals the outlet channel B, and the outlet channel B is closed. Among them, the forward pressure difference is defined as the opening force, and the reverse pressure difference is defined as the closing force; Then there is ; ; In the formula: To open the force, For closing force, For inlet pressure, The radius of the piston's upper end face. The radius of the piston's lower end face. To balance the radius of the moving rod, For the weight of the parts, For spring force, This is friction.

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