Anti-backpressure balance valve

Abstract

The balance valve comprises a balance valve body, a first cavity and a second cavity are formed in the inner side of the balance valve body, the first cavity communicates with the second cavity, a balance valve structure assembly is installed on the inner side of the first cavity, and one end of the balance valve structure assembly is connected with an air pressure adjusting mechanism; the second cavity is used for adjusting the set pressure of the balance valve structure assembly, and a damping adjusting assembly is installed on the inner side of the second cavity. By arranging the air pressure adjusting mechanism, the influence of oil return back pressure on pressure setting in the balance valve structure assembly is effectively solved, and the balance valve structure assembly is particularly suitable for a hydraulic system with a long pipeline loop; the problem that the opening impact of the balance valve is large in a hydraulic system with continuously changing loads can be effectively solved, the influence of external load changes on the opening of the balance valve can be eliminated to a certain extent, the balance valve is more stable to use, the opening characteristic of the balance valve is changed through the arrangement of the damping adjusting assembly, and by combining the reversing valve structure assembly, the balance valve is more stable to use. And the dynamic opening characteristic of the balance valve is more perfect.

Description

Technical Field

[0001] The present invention relates to the technical field of hydraulic valves, and particularly relates to a backpressure-proof balance valve. Background Art

[0002] In modern construction machinery, building machinery and other mechanical equipment, hydraulic load-bearing systems are widely used. Among them, the balance valve is a key hydraulic component in such systems. The main function of the balance valve is to change the flow resistance of the fluid in the hydraulic system to achieve the purpose of regulating the flow rate. The quality of its performance directly affects the performance of the whole machine.

[0003] At present, when the balance valve on the market is used in a hydraulic system, it often encounters the situation of oil return backpressure. Especially in a hydraulic system with a long pipeline loop, the oil return backpressure will affect the pressure setting of the balance valve, resulting in its failure. In severe cases, it may cause damage to the springs of the hydraulic system and pose a danger. On the other hand, when the balance valve is opened in a hydraulic system with continuously changing loads, the impact is relatively large, resulting in a reduced service life of the balance valve. At the same time, when in use, the balance valve is often in a dynamically opened state, and the dynamic opening characteristics of the existing balance valve need to be improved. The normal dynamic opening will also affect its service life.

[0004] Based on this, a backpressure-proof balance valve is proposed, providing a new solution to solve the above technical problems. Summary of the Invention

[0005] Based on this, it is necessary to provide a backpressure-proof balance valve for the technical problems proposed in the above background art.

[0006] In order to solve the above technical problems, the present invention adopts the following technical solutions: The backpressure-proof balance valve specifically includes a balance valve body. A first chamber and a second chamber are opened inside the balance valve body. The first chamber and the second chamber are in communication with each other. A balance valve structure assembly is installed inside the first chamber. One end of the balance valve structure assembly is connected to a pneumatic adjustment mechanism for adjusting the set pressure of the balance valve structure assembly. A damping adjustment component is installed inside the second chamber. A reversing valve structure assembly is installed inside the balance valve body and below the second chamber. A check valve structure assembly is provided inside the reversing valve structure assembly.

[0007] Preferably, an oil outlet two V2 is provided inside the balance valve body and at the top of the first chamber, an oil inlet two C2 is provided inside the balance valve body and on one side of the first chamber, an oil inlet one C1 is provided inside the balance valve body and at the top of the second chamber, and an oil outlet one V1 is provided inside the balance valve body and on one side of the second chamber. The oil outlet one V1, the oil inlet one C1 and the second chamber communicate with each other, and the oil outlet two V2, the oil inlet two C2 and the first chamber communicate with each other.

[0008] Preferably, the balance valve structure assembly includes a pressure regulating screw barrel which is threadedly connected inside the first chamber. A balance valve core is slidably connected inside the pressure regulating screw barrel near one end of the second chamber. A balance piston is provided at one end of the balance valve core away from the pressure regulating screw barrel. A first seal is sleeved outside the balance piston for sealing with the balance valve body. A second seal is sleeved around the outer periphery of the balance valve core near one end of the pressure regulating screw barrel for sealing between the pressure regulating screw barrel and the balance valve core. A one-way valve seat is slidably connected inside the first chamber at one end of the pressure regulating screw barrel. A third seal is sleeved around the outer periphery of the one-way valve seat for sealing between the one-way valve seat and the balance valve body. A first return spring is provided inside the one-way valve seat, and two ends of the first return spring are respectively connected with the one-way valve seat and the balance valve body. The one-way valve seat is arranged outside the balance valve core, and the contact surface between the balance valve core and the one-way valve seat is a conical surface.

[0009] Preferably, the balance valve structure assembly further includes a first pressure regulating screw which is threadedly connected inside the pressure regulating screw barrel away from one end of the balance valve core. A pressure regulating through hole is provided inside the first pressure regulating screw. An air pipe joint is threadedly connected outside the first pressure regulating screw and at one end of the pressure regulating screw barrel. The air pipe joint is used for connecting a pneumatic regulating mechanism. A first pressure regulating spring is connected to one end of the first pressure regulating screw near the balance valve core. A spring seat is connected to one end of the first pressure regulating spring away from the first pressure regulating screw. The spring seat abuts against the balance valve core, and the contact surface between the spring seat and the balance valve core is a conical surface. A plurality of flow-through grooves are provided at one end of the pressure regulating screw barrel near the balance valve core.

[0010] Preferably, the damping regulating assembly includes a throttle valve core provided inside the second chamber. A positioning nut is threadedly connected outside the throttle valve core and fixed at one end of the balance valve body. An adjusting knob is fixed outside the balance valve body at one end of the throttle valve core. A flow-through gap is provided between the bottom of one end of the throttle valve core near the balance valve core and the inner wall of the second chamber.

[0011] Preferably, an installation cavity is provided inside the balance valve body and below the second chamber. The reversing valve structure assembly includes a reversing valve body threadedly connected to the inner bottom of the installation cavity. The inner bottom of the reversing valve body is threadedly connected to a reversing valve seat. The inner bottom of the reversing valve seat is threadedly connected to a second pressure regulating screw. The top of the second pressure regulating screw is connected to a second pressure regulating spring. The top of the second pressure regulating spring is connected to a push rod. The outer side of the top of the push rod is sleeved with a reversing valve core. The reversing valve core is slidably connected to the inner side of the reversing valve body. An oil flow hole is provided inside the top of the reversing valve body.

[0012] Preferably, a flow-through gap is provided between the top of the push rod and the reversing valve core. A second oil flow-through hole is transversely provided inside the reversing valve core. A first oil flow-through hole matching the second oil flow-through hole is transversely provided inside the reversing valve body. A hydraulic control hole is provided inside the balance valve body and on one side of the first oil flow-through hole. When the reversing valve structure assembly is in the normal position, the second chamber, the hydraulic control hole, the second oil flow-through hole, and the oil flow hole are interconnected.

[0013] Preferably, a second return spring is connected to the inner top of the reversing valve body and below the oil flow hole. The bottom of the second return spring is fixed with a one-way valve core. The one-way valve core is located above the push rod.

[0014] Preferably, a seventh sealing member for sealing between the reversing valve body and the balance valve body is sleeved outside the reversing valve body. A fifth sealing member for sealing between the reversing valve core and the reversing valve body is sleeved outside the reversing valve core. A sixth sealing member for sealing between the push rod and the reversing valve core is sleeved outside the push rod.

[0015] Compared with the prior art, the present invention has the following beneficial effects: 1. By setting the air pressure regulating mechanism, the present invention effectively solves the influence of the oil return back pressure on the pressure setting in the balance valve structure assembly, and is particularly suitable for hydraulic systems with long pipeline circuits.

[0016] 2. By adding a reversing valve structure assembly to the control port, the present invention can effectively solve the problem of large opening impact of the balance valve in a hydraulic system with continuously changing loads, can eliminate the influence of external load changes on the opening of the present balance valve to a certain extent, make the present balance valve more stable in use, and greatly improve the practicability and safety.

[0017] 3. By adopting the combined method of double conical surfaces for the main valve core, the present invention can ensure the full-open speed while saving energy, and can also make the present balance valve achieve a sufficient small-flow counterforce when not fully open, enhancing the operation stability of the present balance valve under extreme working conditions such as "large flow and low load", "small flow and heavy load", "small flow and low load", and "large flow and heavy load".

[0018] 4. Through the setting of the damping adjustment component, the present invention can adjust the damping of the second chamber passage, change the opening characteristics of the present balance valve, and combine with the reversing valve structure component to make the dynamic opening characteristics of the present balance valve more perfect. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the solutions in the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0020] Figure 1 Side view structure schematic of the present invention Figure 1 ; Figure 2 Top view structure schematic of the present invention; Figure 3 Side view structure schematic of the present invention Figure 2 ; Figure 4 Sectional view structure schematic of the present invention Figure 1 ; Figure 5 Sectional view structure schematic of the present invention Figure 2 ; Figure 6 Structure schematic of the air pressure adjustment mechanism connected to the valve body of the present invention; Figure 7 Hydraulic principle schematic of the present invention.

[0021] The marks in the drawings are explained as follows: C1, inlet port 1; C2, inlet port 2; V1, outlet port 1; V2, outlet port 2; 100, balance valve body; 101, first chamber; 102, second chamber; 201, pressure regulating barrel; 203, first pressure regulating screw; 204, first pressure regulating spring; 205, spring seat; 206, air pipe joint; 207, balance valve core; 208, balance piston; 209, first seal; 210, second seal; 211, flow-through groove; 212, check valve seat; 213, first return spring; 214, third seal; 216, pressure regulating through hole; 301, throttle valve core; 302, adjusting knob; 303, positioning nut; 304, flow-through gap; 401, reversing valve body; 402, reversing valve seat; 403, second pressure regulating screw; 404, second pressure regulating spring; 405, second return spring; 406, ejector rod; 407, reversing valve core; 408, fifth seal; 409, sixth seal; 410, seventh seal; 411, first flow-through hole; 412, second flow-through hole; 413, check valve core; 415, flow-through hole; 416, hydraulic control hole; 500, air pressure regulating mechanism. Detailed implementation manners

[0022] In order to enable those skilled in the art of this technology to better understand the solution of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.

[0023] Please refer to Figures 1-7, including a balance valve body 100. A first chamber 101 and a second chamber 102 are provided inside the balance valve body 100. The first chamber 101 and the second chamber 102 are interconnected. A balance valve structure assembly is installed inside the first chamber 101. One end of the balance valve structure assembly is connected to a pneumatic pressure regulating mechanism 500 for regulating the set pressure of the balance valve structure assembly. A damping regulating component is installed inside the second chamber 102. A reversing valve structure assembly is installed inside the balance valve body 100 and below the second chamber 102. A check valve structure assembly is provided inside the reversing valve structure assembly. Specifically, when this balance valve is in use, the influence of the oil return back pressure on the pressure setting in the balance valve structure assembly is effectively solved through the setting of the pneumatic pressure regulating mechanism 500. It is particularly suitable for hydraulic systems with long pipeline circuits. By adding a reversing valve structure assembly through the control port, the problem of large opening impact of the balance valve in a hydraulic system with continuously changing loads can be effectively solved. The influence of external load changes on the opening of this balance valve can be eliminated to a certain extent, making the use of this balance valve more stable, greatly improving the practicability and safety. By adopting a combination method of double conical surfaces for the main spool, the full-open speed can be guaranteed while saving energy, and a sufficient small-flow counterforce can be achieved when this balance valve is not fully open, enhancing the operation stability of this balance valve under extreme working conditions such as "large flow and low load", "small flow and heavy load", "small flow and low load", and "large flow and heavy load". Through the setting of the damping regulating component, the channel damping of the second chamber 102 can be adjusted, changing the opening characteristics of the balance valve. Combined with the reversing valve structure assembly, the dynamic opening characteristics of this balance valve are made more perfect.

[0024] Please refer to Figure 4 , an oil outlet two V2 is provided at the top of the first chamber 101 inside the balance valve body 100. An oil inlet two C2 is provided on one side of the first chamber 101 inside the balance valve body 100. An oil inlet one C1 is provided at the top of the second chamber 102 inside the balance valve body 100. An oil outlet one V1 is provided on one side of the second chamber 102 inside the balance valve body 100. The oil outlet one V1, the oil inlet one C1 and the second chamber 102 are interconnected. The oil outlet two V2, the oil inlet two C2 and the first chamber 101 are interconnected.

[0025] Please refer to Figures 4-7, the balance valve structure assembly includes a pressure regulating screw cylinder 201, which is threadedly connected to the inner side of the first chamber 101. A balance valve core 207 is slidably connected to the inner side of one end of the pressure regulating screw cylinder 201 close to the second chamber 102. A balance piston 208 is provided at one end of the balance valve core 207 away from the pressure regulating screw cylinder 201. A first seal 209 for sealing with the balance valve body 100 is sleeved on the outer side of the balance piston 208. A second seal 210 is sleeved on the outer periphery of one end of the balance valve core 207 close to the pressure regulating screw cylinder 201 for sealing between the pressure regulating screw cylinder 201 and the balance valve core 207. A check valve seat 212 is slidably connected to the inner side of one end of the pressure regulating screw cylinder 201 in the first chamber 101. A third seal 214 is sleeved on the outer periphery of the check valve seat 212 for sealing between the check valve seat 212 and the balance valve body 100. A first return spring 213 is provided inside the check valve seat 212. The two ends of the first return spring 213 are respectively connected to the check valve seat 212 and the balance valve body 100. The check valve seat 212 is arranged outside the balance valve core 207. The contact surface between the balance valve core 207 and the check valve seat 212 is a conical surface. The balance valve structure assembly further includes a first pressure regulating screw 203 threadedly connected to the inner side of one end of the pressure regulating screw cylinder 201 away from the balance valve core 207. A pressure regulating through hole 216 is opened inside the first pressure regulating screw 203. An air pipe joint 206 is threadedly connected to one end of the first pressure regulating screw 203 outside the pressure regulating screw cylinder 201. The air pipe joint 206 is used to connect the air pressure regulating mechanism 500. A first pressure regulating spring 204 is connected to one end of the first pressure regulating screw 203 close to the balance valve core 207. A spring seat 205 is connected to the end of the first pressure regulating spring 204 away from the first pressure regulating screw 203. The spring seat 205 abuts against the balance valve core 207. The contact surface between the spring seat 205 and the balance valve core 207 is a conical surface. A plurality of flow-through grooves 211 are opened at one end of the pressure regulating screw cylinder 201 close to the balance valve core 207. Specifically, during use, hydraulic oil enters the inner side of the first chamber 101 through the second oil inlet C2. When the pressure of the hydraulic oil continuously increases and is greater than the set pressure of the first pressure regulating spring 204 acting on the spring seat 205, the balance valve core 207 moves towards the direction close to the spring seat 205, and the spring seat 205 is compressed. At this time, the hydraulic oil can enter the second oil outlet V2 through the first chamber 101 and the flow-through grooves 211 and flow out from the second oil outlet V2. During this process, the check valve seat 212 and the first return spring 213 form a check valve structure to realize the check valve function. When the pressure of the hydraulic oil entering the second oil inlet C2 is less than the acting force of the first pressure regulating spring 204 on the spring seat 205, under the action of the first pressure regulating spring 204, the spring seat 205 abuts against the balance valve core 207 and makes the balance valve core 207 abut against the check valve seat 212. At this time, the oil cannot flow into the inner side of the first chamber 101 from the second oil outlet V2, so as to realize the one-way flow function; On the other hand, the air pressure regulating mechanism 500 is used for regulating atmospheric pressure. When it is connected to the air pipe joint 206, the opening pressure of the balance valve core 207 can be regulated through the air pressure regulating mechanism 500, the pressure inside the air pipe joint 206 can be regulated through the air pressure regulating mechanism 500, and the air pressure between the balance valve core 207 and the pressure regulating screw cylinder 201 can be regulated through the pressure regulating through hole 216, so that the air pressure acts on the balance valve core 207, and the opening pressure of the balance valve core 207 can be dynamically controlled through the air pressure regulating mechanism 500, thus effectively solving the influence of the oil return back pressure on the pressure setting in the balance valve structural components, and is particularly applicable to hydraulic systems with long pipeline circuits; At the same time, the balance valve core 207 and the spring seat 205 adopt a combination mode of double conical surfaces, which can not only ensure the full-open speed energy-saving, but also enable the balance valve to achieve a sufficient small-flow counteracting force when not fully open, enhancing the application stability of the balance valve under extreme working conditions such as "large flow rate and low load", "small flow rate and heavy load", "small flow rate and low load", and "large flow rate and heavy load".

[0026] Please refer to Figures 1-7 , the damping adjustment component includes a throttle valve core 301 arranged inside the second chamber 102. A positioning nut 303 is threadedly connected to the outer side of the throttle valve core 301. The positioning nut 303 is fixed to one end of the balance valve body 100. An adjustment knob 302 is fixed to one end of the throttle valve core 301 and located outside the balance valve body 100. An over-flow gap 304 is formed between the bottom of one end of the throttle valve core 301 close to the balance valve core 207 and the inner wall of the second chamber 102. Specifically, under normal conditions, the hydraulic oil enters the inside of the second chamber 102 from the first oil inlet C1 port and flows out through the first oil outlet V1 port. By adjusting the position of the throttle valve core 301, the flow rate through the first oil outlet V1 port can be adjusted to achieve the throttling effect. The specific adjustment process is as follows: manually adjust the adjustment knob 302, and the position of the throttle valve core 301 can be adjusted by rotating the adjustment knob 302, thereby adjusting the damping of the second chamber 102 passage.

[0027] Please refer to Figures 4-7, an installation cavity is provided inside the balance valve body 100 and below the second chamber 102. The reversing valve structure assembly includes a reversing valve body 401 threadedly connected to the inner bottom of the installation cavity. The inner bottom of the reversing valve body 401 is threadedly connected with a reversing valve seat 402. The inner bottom of the reversing valve seat 402 is threadedly connected with a second pressure regulating screw 403. The top of the second pressure regulating screw 403 is connected with a second pressure regulating spring 404. The top of the second pressure regulating spring 404 is connected with a push rod 406. The outer side of the top of the push rod 406 is sleeved with a reversing valve core 407. The reversing valve core 407 is slidably connected to the inner side of the reversing valve body 401. An oil flow hole 415 is provided in the inner top of the reversing valve body 401. There is a flow-through gap between the top of the push rod 406 and the reversing valve core 407. A second oil flow-through hole 412 is horizontally provided inside the reversing valve core 407. A first oil flow-through hole 411 matching the second oil flow-through hole 412 is horizontally provided inside the reversing valve body 401. A hydraulic control hole 416 is provided inside the balance valve body 100 and on one side of the first oil flow-through hole 411. When the reversing valve structure assembly is in the normal position, the second chamber 102, the hydraulic control hole 416, the second oil flow-through hole 412, and the oil flow hole 415 communicate with each other. Specifically, when in the normal position, the second chamber 102, the hydraulic control hole 416, the second oil flow-through hole 412, and the oil flow hole 415 communicate with each other. The hydraulic oil entering the inner side of the second chamber 102 through the first oil inlet C1 can enter one end of the first seal 209 through the flow-through gap 304. At the same time, the hydraulic oil entering the inner side of the second chamber 102 through the first oil inlet C1 can enter the inner side of the flow-through gap through the oil flow hole 415, and enter the inner side of the second oil flow-through hole 412 through the flow-through gap, then enter the inner side of the first oil flow-through hole 411 through the second oil flow-through hole 412, and then enter the inner side of the hydraulic control hole 416, and thus enter one end of the first seal 209. The hydraulic oil entering one end of the first seal 209 through the flow-through gap and the hydraulic control hole 416 can assist in opening the balance valve core 207; When the pressure of the hydraulic oil entering the first oil inlet C1 continues to increase, the pressure of the hydraulic oil entering the oil flow hole 415 increases, causing the second return spring 405 to move downward to block the flow-through gap. At this time, the hydraulic oil can only enter the inner side of the second oil flow-through hole 412 through the hydraulic control hole 416 and enter the flow-through gap, and can flow only after pushing open the second return spring 405. The setting of the second return spring 405 has the effect of a check valve. When the second return spring 405 blocks the flow-through gap, the hydraulic control reversing effect is achieved. With the setting of the damping adjustment assembly, the channel damping of the second chamber 102 can be adjusted, changing the opening characteristics of this balance valve. Combined with the reversing valve structure assembly, the dynamic opening characteristics of this balance valve are made more perfect.

[0028] Please refer to Figure 4, a second return spring 405 is connected to the inner top of the reversing valve body 401 and below the flow-through hole 415. A check valve core 413 is fixed to the bottom of the second return spring 405. The check valve core 413 is located above the ejector rod 406. A seventh seal 410 for sealing with the balance valve body 100 is sleeved on the outside of the reversing valve body 401. A fifth seal 408 for sealing with the reversing valve body 401 is sleeved on the outside of the reversing valve core 407. A sixth seal 409 for sealing with the reversing valve core 407 is sleeved on the outside of the ejector rod 406.

[0029] In the present invention, unless otherwise clearly defined and limited, terms such as "installation", "connection", "connection", "fixation" and the like shall be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection, an electrical connection or communication with each other; it can be directly connected, or indirectly connected through an intermediate medium, and can be the communication inside two components or the interaction relationship between two components, unless otherwise clearly defined. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0030] Obviously, the above-described embodiments are only a part of the embodiments of the present invention, rather than all embodiments. The preferred embodiments of the present invention are given in the drawings, but do not limit the patent scope of the present invention. The present invention can be implemented in many different forms. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosed content of the present invention more thorough and comprehensive. Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions described in the foregoing specific embodiments, or perform equivalent replacements on some of the technical features. Any equivalent structure directly or indirectly using the content of the specification and drawings of the present invention in other related technical fields shall be within the scope of the patent protection of the present invention by the same token.

Claims

1. A balancing valve for preventing back pressure, characterized in that: The invention comprises a balancing valve body (100), wherein a first chamber (101) and a second chamber (102) are provided inside the balancing valve body (100), wherein the first chamber (101) and the second chamber (102) are communicated with each other, wherein a balancing valve structural component is installed inside the first chamber (101), wherein one end of the balancing valve structural component is connected to a gas pressure regulating mechanism (500) for regulating a set pressure of the balancing valve structural component, wherein a damping regulating component is installed inside the second chamber (102), and a reversing valve structural component is installed inside the balancing valve body (100) and below the second chamber (102), wherein a check valve structural component is provided inside the reversing valve structural component.

2. The anti-back pressure balancing valve according to claim 1, characterized in that: An oil outlet port 2 (V2) is provided on the inner side of the balancing valve body (100) and located at the top of the first chamber (101); an oil inlet port 2 (C2) is provided on the inner side of the balancing valve body (100) and located at one side of the first chamber (101); an oil inlet port 1 (C1) is provided on the inner side of the balancing valve body (100) and located at the top of the second chamber (102); an oil outlet port 1 (V1) is provided on the inner side of the balancing valve body (100) and located at one side of the second chamber (102); the oil outlet port 1 (V1), the oil inlet port 1 (C1) and the second chamber (102) are in communication with each other, and the oil outlet port 2 (V2) and the oil inlet port 2 (C2) are in communication with the first chamber (101).

3. The anti-back pressure balancing valve according to claim 1, characterized in that: The balancing valve structural component comprises a pressure regulating screw barrel (201), wherein the pressure regulating screw barrel (201) is threadedly connected to the inner side of the first chamber (101), and a balancing valve core (207) is slidably connected to the inner side of one end of the pressure regulating screw barrel (201) close to the second chamber (102), and a balancing piston (208) is provided at one end of the balancing valve core (207) away from the pressure regulating screw barrel (201), and a first sealing member (209) for sealing with the balancing valve body (100) is sleeved on the outer side of the balancing piston (208), and a second sealing member (210) is sleeved on the outer periphery of one end of the balancing valve core (207) close to the pressure regulating screw barrel (201) for sealing the pressure regulating screw barrel (201) with the balancing valve core (202). 7), a one-way valve seat (212) is slidably connected to the inner side of the first chamber (101) and located at one end of the pressure regulating screw barrel (201), and a third sealing member (214) is sleeved on the outer periphery of the one-way valve seat (212) for sealing between the one-way valve seat (212) and the balancing valve body (100), a first return spring (213) is provided on the inner side of the one-way valve seat (212), and two ends of the first return spring (213) are respectively connected to the one-way valve seat (212) and the balancing valve body (100), the one-way valve seat (212) is provided on the outer side of the balancing valve core (207), and the contact surface between the balancing valve core (207) and the one-way valve seat (212) is set as a conical surface.

4. The anti-back pressure balancing valve according to claim 3, characterized in that: The balancing valve structural assembly further comprises a first pressure regulating screw (203) threadedly connected to the inner side of an end of the pressure regulating screw barrel (201) away from the balancing valve core (207), a pressure regulating through hole (216) being provided on the inner side of the first pressure regulating screw (203), an air pipe joint (206) being threadedly connected to the outer side of the first pressure regulating screw (203) and located at an end of the pressure regulating screw barrel (201), the air pipe joint (206) being used to connect to the air pressure regulating mechanism (500), and the first pressure regulating screw (20 3) A first pressure regulating spring (204) is connected to one end close to the balancing valve core (207), and a spring seat (205) is connected to one end of the first pressure regulating spring (204) away from the first pressure regulating screw (203). The spring seat (205) abuts against the balancing valve core (207), and a contact surface between the spring seat (205) and the balancing valve core (207) is set as a conical surface. A plurality of flow grooves (211) are opened at one end of the pressure regulating screw barrel (201) close to the balancing valve core (207).

5. The anti-back pressure balancing valve according to claim 2, characterized in that: The damping adjustment assembly comprises a throttle valve core (301) arranged inside the second chamber (102); the outer side of the throttle valve core (301) is threadedly connected to a positioning nut (303); the positioning nut (303) is fixed to one end of the balancing valve body (100); an adjustment knob (302) is fixed to one end of the throttle valve core (301) and located outside the balancing valve body (100); and a flow gap (304) is provided between the bottom of one end of the throttle valve core (301) close to the balancing valve core (207) and the inner wall of the second chamber (102).

6. The anti-back pressure balancing valve according to claim 5, characterized in that: An installation cavity is provided inside the balancing valve body (100) and below the second chamber (102); the reversing valve structural assembly comprises a reversing valve body (401) threadedly connected to the bottom of the inside of the installation cavity; a reversing valve seat (402) is threadedly connected to the bottom of the inside of the reversing valve body (401); a second pressure regulating screw (403) is threadedly connected to the bottom of the inside of the reversing valve seat (402); a second pressure regulating spring (404) is connected to the top of the second pressure regulating screw (403); a push rod (406) is connected to the top of the second pressure regulating spring (404); a reversing valve core (407) is sleeved on the outer side of the top of the push rod (406); the reversing valve core (407) is slidably connected to the inside of the reversing valve body (401); and a flow hole (415) is provided on the inner side of the top of the reversing valve body (401).

7. The anti-back pressure balancing valve according to claim 6, characterized in that: A flow gap is provided between the top of the push rod (406) and the reversing valve core (407); a second flow hole (412) is transversely provided on the inner side of the reversing valve core (407); a first flow hole (411) matching the second flow hole (412) is transversely provided on the inner side of the reversing valve body (401); a hydraulic control hole (416) is provided on the inner side of the balancing valve body (100) and on one side of the first flow hole (411); when the reversing valve structural component is in a normal position, the second chamber (102), the hydraulic control hole (416), the second flow hole (412), and the flow hole (415) are interconnected.

8. The anti-back pressure balancing valve according to claim 7, characterized in that: A second return spring (405) is connected to the top of the inner side of the reversing valve body (401) and located below the flow hole (415). A one-way valve core (413) is fixed to the bottom of the second return spring (405). The one-way valve core (413) is located above the push rod (406).

9. The anti-back pressure balancing valve according to claim 8, characterized in that: The outer side of the reversing valve body (401) is provided with a seventh sealing member (410) for sealing with the balancing valve body (100); the outer side of the reversing valve core (407) is provided with a fifth sealing member (408) for sealing with the reversing valve body (401); and the outer side of the push rod (406) is provided with a sixth sealing member (409) for sealing with the reversing valve core (407).

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