Integrated two-way cartridge proportional valve

Abstract

The utility model provides an integrated two-way cartridge proportional valve which comprises a main valve and a pilot valve. The main valve comprises an integrated valve seat, a main valve element, a main valve end cover, a sensor connecting end cover and a sensor assembly. A pilot valve installation face is arranged on the side face of the integrated valve seat of the main valve and used for installing the pilot valve, the pilot valve is a 10-drift-diameter servo proportional reversing valve, and an amplifier assembly and a proportional electromagnet with an integrated linear displacement sensor are arranged in the pilot valve. According to the utility model, the main valve part adopts the valve body and the valve sleeve which are of an integrated structure, so that the machining precision is reduced, the mounting difficulty is reduced, and the production components are reduced; a 10-drift-diameter servo proportional reversing valve and a proportional electromagnet with an integrated displacement sensor are adopted in a pilot valve part, zero covering is conveniently achieved through the design of a valve sleeve structure, normal use can be achieved on high-frequency-response and high-precision occasions, and meanwhile through two-stage displacement feedback, the control precision is higher, and the dynamic performance is better.

Description

Technical Field

[0001] The utility model belongs to the technical field of hydraulic control valves, and in particular relates to an integrated two-way cartridge proportional valve. Background Art

[0002] Hydraulic transmission is a transmission method that uses liquid as the working medium to exchange, transfer and control energy. It has become an irreplaceable and important basic technology in the process of modernization of industry, agriculture, national defense and science and technology.

[0003] Hydraulic systems are usually composed of two parts: hydraulic components (including energy components, actuators, hydraulic control components, auxiliary components) and working media. Hydraulic control components have many specifications, wide application and flexibility. Through different combinations of hydraulic valves, various types of hydraulic systems can be formed. Hydraulic valves play an important role in hydraulic systems.

[0004] In the development of hydraulic transmission and control technology, proportional control and cartridge valve technology have developed rapidly in the last 20 years of the 20th century. Cartridge proportional valves change the pilot level in hydraulic control, allowing hydraulic control to develop from intermittent switch control to continuous proportional control. According to the input electrical signal, it can continuously and proportionally control the pressure, flow and other parameters of the oil.

[0005] Chinese patent document CN102913634A discloses a large-flow digital dual closed-loop two-way cartridge proportional throttle valve, including a pilot stage, a main stage and an integrated digital amplifier 8, wherein the main stage includes a main stage valve body 12, a cartridge main valve sleeve 11, a main valve core 10 and a main stage valve core position sensor 16, and the pilot stage is a 6-diameter servo proportional valve, including a pilot valve body 3, a pilot valve sleeve 4, a zero-cover four-control side sliding valve core 5, a proportional solenoid 6, a proportional solenoid exhaust screw 7, a pilot stage valve core position sensor 9 and a pilot stage force spring 1. In the two-way cartridge proportional throttle valve disclosed in the patent document, the main stage valve body 12 and the cartridge main valve sleeve 11 in the main stage are split structures, and the valve body and valve sleeve of this split structure are also common structures in the current two-way cartridge proportional throttle valve, which have high requirements on the processing accuracy of parts and high processing costs. Utility Model Content

[0006] In view of the deficiencies in the prior art, the utility model aims to provide an integrated two-way cartridge proportional valve with an improved structure.

[0007] To achieve the above purpose, the solution adopted by the utility model is as follows:

[0008] The utility model provides an integrated two-way cartridge proportional valve, comprising a main valve and a pilot valve; wherein:

[0009] The main valve comprises an integrated valve seat, a main valve core, a main valve end cover, a sensor connection end cover and a sensor assembly. A main valve hole having a central axis is provided in the integrated valve seat, the main valve core is located in the main valve hole, the integrated valve seat comprises a distal end face and a proximal end face perpendicular to the central axis, the main valve end cover is fixed to the proximal end face of the integrated valve seat, a step through hole located on the central axis is provided on the main valve end cover, the step through hole comprises a distal through hole and a proximal through hole, a valve core hole is provided in the main valve core, and a spring is provided in the valve core hole; the sensor connection end cover is fixed in the proximal through hole of the main valve end cover, the sensor assembly is fixedly connected to the main valve through the sensor connection end cover, and comprises a measuring rod connecting rod and a displacement sensor, the sensor connection end cover is fixed in the proximal through hole of the main valve end cover, one end of the measuring rod connecting rod passes through the spring and is fixed to the main valve core, and the other end of the measuring rod connecting rod passes through the sensor connection end cover and is connected to the displacement sensor;

[0010] A pilot valve mounting surface is provided on the side of the integrated valve seat of the main valve for mounting the pilot valve, wherein the pilot valve is a 10-diameter servo proportional reversing valve with a built-in amplifier assembly and a proportional solenoid with an integrated linear displacement sensor;

[0011] An oil inlet P, a working oil port A, a working oil port B, two communicating oil return ports T, a control oil port X, and a control oil port Y are also provided on the integrated valve seat of the main valve. The oil inlet P is communicated with the control oil port X, and the two oil return ports T are communicated with the control oil port Y. The control oil port X and the control oil port Y are located on the distal end surface of the integrated valve seat, and the working oil port A and the working oil port B are located at the distal end of the main valve core and are communicated with the main valve hole of the integrated valve seat.

[0012] Preferably, a step protrusion is provided on the main valve core, and the step protrusion separates the gap between the integrated valve seat of the main valve and the main valve core into a first control chamber and a second control chamber that are isolated from each other.

[0013] Preferably, a working oil port M and a working oil port N are provided on the pilot valve, the first control chamber and the second control chamber are respectively communicated with the working oil port M and the working oil port N of the pilot valve, and a working oil port P and a working oil port Q are formed on the main valve hole of the integrated valve seat.

[0014] Preferably, the proximal end of the main valve core is inserted into the distal through hole of the main valve end cover, and the proximal end of the main valve core and the inner wall of the main valve end cover are the first contact surface; the step protrusion of the main valve core and the inner wall of the integrated valve seat of the main valve are the second contact surface, and the distal end of the main valve core and the inner wall of the integrated valve seat of the main valve are the third contact surface; a first sealing ring is respectively provided on the first contact surface, the second contact surface and the third contact surface to achieve sealing in the radial movement direction of the main valve core.

[0015] Preferably, the first sealing ring is a Glay ring.

[0016] Preferably, a connecting portion is provided at the distal end of the main valve end cover, and the connecting portion is inserted into the proximal end of the main valve hole of the integrated valve seat.

[0017] Preferably, a second sealing ring is provided on the contact surface between the connecting portion of the main valve end cover and the inner wall of the integrated valve seat.

[0018] Preferably, an annular fixing portion protruding from the main valve end cover is provided on the integrated valve seat, and a first fixing screw for fixing the integrated two-way cartridge proportional valve is provided on the annular fixing portion; preferably, the first fixing screw includes 8 M24 screws evenly distributed on the annular fixing portion.

[0019] Preferably, the control oil port X and the control oil port Y are located on the distal end surface of the annular fixing portion of the integrated valve seat.

[0020] Preferably, a fixing threaded hole for fixing the main valve end cover is provided on the proximal end face of the integrated valve seat and on the annular contact surface in contact with the main valve end cover, and a second fixing screw is provided passing through the main valve end cover and inserted into the fixing threaded hole; preferably, the second fixing screw includes 14 M16 screws evenly distributed on the annular contact surface.

[0021] Beneficial Effects

[0022] The utility model provides an integrated two-way cartridge proportional valve, in which the main valve part adopts a valve body and a valve sleeve of an integrated structure, which reduces the processing accuracy, reduces the installation difficulty, and reduces the production components; the pilot valve part adopts a 10-diameter servo proportional reversing valve and a proportional electromagnet with an integrated displacement sensor, and the design of the valve sleeve structure conveniently realizes zero covering, and can be used normally in high-frequency response and high-precision occasions. At the same time, through two-stage displacement feedback, the control accuracy is higher and the dynamic performance is better. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a three-dimensional structural schematic diagram of an integrated two-way cartridge proportional valve involved in the utility model.

[0024] Figure 2 The utility model is an assembly cross-sectional view of an integrated two-way cartridge proportional valve.

[0025] Figure 3 It is a functional symbol diagram of the integrated two-way cartridge proportional valve involved in the utility model.

[0026] Figure 4 It is a partial cross-sectional view of the main valve core of the integrated two-way cartridge proportional valve involved in the utility model.

[0027] Figure 5 It is a schematic diagram of various oil ports of the integrated valve seat of the integrated two-way cartridge proportional valve involved in the utility model.

[0028] Figure 6 It is a structural schematic diagram of the insertion hole of the annular fixing portion of the integrated valve seat of the integrated two-way cartridge proportional valve involved in the utility model. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Generally, the components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0030] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the present invention to be protected, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0032] In the description of the present utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate the orientation or position relationship based on the orientation or position relationship shown in the accompanying drawings, or the orientation or position relationship in which the utility model product is usually placed when in use, which is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0033] In addition, the terms "horizontal", "vertical" and the like do not mean that the components are required to be absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0034] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0035] To this end, the following solutions are proposed:

[0036] See also Figure 1-3 The utility model provides an integrated two-way cartridge proportional valve, including a main valve part 100 and a pilot valve part 200 .

[0037] Specifically, the main valve part 100 includes an integrated valve seat 101, a main valve core 102, a main valve end cover 107, a sensor connection end cover 109 and a sensor assembly 1010. A main valve hole 1011 with a central axis is provided in the integrated valve seat 101. The main valve core 102 is located in the main valve hole 1011 and can move axially in the main valve hole 1011. A valve core hole 1021 is provided in the main valve core 102, and a spring 106 is provided at the proximal end of the valve core hole 1021. The integrated valve seat 101 is provided with a distal end face 1014 and a proximal end face 1015 perpendicular to the central axis, and the main valve end cover 107 is fixed to the proximal end face 1015 of the integrated valve seat 101. A stepped through hole 1071 located on the central axis is opened on the main valve end cover 107. The stepped through hole 1071 includes a distal through hole 1071a and a proximal through hole 1071b. A first step 1072 is provided in the main valve end cover 107 to form the distal through hole 1071a and the proximal through hole 1071b.

[0038] In some embodiments, a second step 1022 is provided in the valve core hole 1021 of the main valve core 102 , one end of the spring 106 abuts against the second step 1022 , and the other end abuts against the first step 1072 of the main valve end cover 107 .

[0039] As an embodiment of the present utility model, the sensor connecting end cover 109 is fixed in the proximal through hole 1071b of the main valve end cover 107, and the sensor assembly 1010 is fixedly connected to the integrated valve seat 101 of the main valve part 100 through the sensor connecting end cover 109. The sensor assembly 1010 includes a measuring rod connecting rod 105 and a displacement sensor (not shown in the figure), one end of the measuring rod connecting rod 105 passes through the spring 106 and is fixed on the main valve core 102, and the other end passes through the sensor connecting end cover 109 and is connected to the displacement sensor in the sensor assembly 1010.

[0040] Combination Figure 4 As shown, a fixing portion 1019 is provided in the valve core hole 1021 of the main valve core 102, and a blind hole 1020 is provided at the proximal center position of the fixing portion 1019. The bottom of the measuring rod connecting rod 105 is fixed in the blind hole 1020, so that one end of the measuring rod connecting rod 105 can be fixed on the main valve core 102.

[0041] In some embodiments, a pilot valve mounting surface 1018 is provided on the side of the integrated valve seat 101 of the main valve part 100 for mounting the pilot valve part 200. The pilot valve part 200 adopts a 10-diameter servo proportional directional valve 201 (for example, a 10-diameter servo proportional directional valve), and has a built-in amplifier assembly 202, a proportional solenoid with an integrated linear displacement sensor, a valve core, a valve body and a valve sleeve, etc. (not shown in the figure). The sensor assembly 1010 of the main valve part 100 is connected to the amplifier assembly 202 of the pilot valve part 200 via a cable 300.

[0042] As an implementation mode of the present invention, when the main valve core 102 moves axially in the main valve hole 1011 of the integrated valve seat 101, the spring 106 is compressed, and the measuring rod connecting rod 105 is driven to move axially. The displacement of the measuring rod connecting rod 105 is converted into a displacement electrical signal in the displacement sensor of the sensor assembly 1010, and is transmitted to the amplifier assembly 202 of the pilot valve part 200 in real time through the cable 300, forming a position closed-loop control; the input signal value is compared with the command value of the servo proportional reversing valve 201 of the proportional electromagnet with an integrated linear displacement sensor in the amplifier assembly 202 to form a deviation current, thereby driving the proportional electromagnet to control the pilot valve core to move back and forth, and at the same time, the linear displacement sensor integrated in the pilot valve controls the pilot valve The displacement information of the core is detected and fed back, and compared with the input signal value to correct the accuracy of the actual value of the pilot displacement; the opening displacement formed between the main valve core 102 of the main valve part 100 and the integrated valve seat 101 is compared with the displacement sensor feedback in the sensor component 1010 of the main valve part 100 and the displacement information of the pilot valve core collected from the amplifier component 202 of the pilot valve part 200 until the input signal value is equal to the actual value, so that the main valve core 102 is in force balance. In this way, the stroke position and valve port change of the main valve core 102 are proportional to the input signal value under the condition of double closed-loop control, thereby realizing accurate and stable flow control of the main valve part 100, forming double closed-loop control, and greatly improving the control accuracy of the integrated two-way cartridge proportional valve.

[0043] As an implementation mode of the present utility model, Figure 5As shown, the integrated valve seat 101 of the main valve part 100 is also provided with an oil inlet P, a working oil port A, a working oil port B, two communicating oil return ports T, a control oil port X, and a control oil port Y. The oil inlet P is communicated with the control oil port X, and the two oil return ports T are communicated with the control oil port Y. The control oil port X and the control oil port Y are located on the distal end surface 1014 of the integrated valve seat 101. The oil inlet P, the working oil port A, the working oil port B, and the two communicating oil return ports T are located on the pilot valve mounting surface 1018 on the side of the integrated valve seat 101 of the main valve part 100, and communicate with the main valve hole 1011 of the integrated valve seat 101. After the main valve part 100 is oiled, the hydraulic oil enters the working oil port A and the working oil port B, thereby promoting the axial movement of the main valve core 102 of the main valve part 100.

[0044] In some embodiments, a step protrusion 1023 is provided on the main valve core 102 of the main valve part 100, and the step protrusion 1023 separates the gap between the integrated valve seat 101 of the main valve part 100 and the main valve core 102 into a first control chamber 1012 and a second control chamber 1013 isolated from each other.

[0045] Furthermore, a working oil port A and a working oil port B are provided on the pilot valve part 200 , the first control chamber 1012 and the second control chamber 1013 are respectively communicated with the working oil port A and the working oil port B of the pilot valve part 200 , and two pressure measuring ports are formed on the main valve hole 1011 of the integrated valve seat 101 .

[0046] As an embodiment of the utility model, the proximal end of the main valve core 102 of the main valve part 100 is inserted into the distal through hole 1071a of the main valve end cover 107, and the proximal end of the main valve core 102 and the inner wall of the main valve end cover 107 are the first contact surface; the step protrusion 1023 of the main valve core 102 and the inner wall of the integrated valve seat 101 of the main valve part 100 are the second contact surface, and the distal end of the main valve core 102 and the inner wall of the integrated valve seat 101 of the main valve part 100 are the third contact surface; a first sealing ring 103 is respectively provided on the first contact surface, the second contact surface and the third contact surface to realize the sealing of the radial movement direction of the main valve core 102, and these first sealing rings 103 are Gray rings.

[0047] As an embodiment of the present invention, a connecting portion 1073 is provided at the distal end of the main valve end cover 107, and the connecting portion 1073 is inserted into the proximal end of the main valve hole 1011 of the integrated valve seat 101. A second sealing ring 1017 is provided on the contact surface between the connecting portion 1073 of the main valve end cover 107 and the inner wall of the integrated valve seat 101.

[0048] As an embodiment of the present invention, an annular fixing portion 1074 protruding from the main valve end cover 107 is provided on the integrated valve seat 101, and a first fixing screw 104 for fixing the integrated two-way cartridge proportional valve of the present invention is provided on the annular fixing portion 1074. Figure 6 As shown, as a preferred embodiment, the first fixing screws 104 include 8 M24 screws evenly distributed on the annular fixing portion 1074 , and correspondingly, the annular fixing portion 1074 of the integrated valve seat 101 has 8 symmetrically distributed sockets 1074 a .

[0049] In some embodiments, two lifting rings 1016 are symmetrically arranged on the proximal end surface and the side surface of the annular fixing portion 1074 of the integrated valve seat 101 for lifting the entire integrated two-way cartridge proportional valve.

[0050] As an embodiment of the utility model, a fixing threaded hole for fixing the main valve end cover 107 is provided on the proximal end face 1015 of the integrated valve seat 101 and the annular contact surface in contact with the main valve end cover 107, and a second fixing screw 108 is provided to pass through the main valve end cover 107 and be inserted into the fixing threaded hole; as a preferred embodiment, the second fixing screw 108 includes 14 M16 screws evenly distributed on the annular contact surface.

[0051] The utility model provides an integrated two-way cartridge proportional valve, in which the main valve part 100 adopts a valve body and a valve sleeve of an integrated structure, which reduces processing accuracy, reduces installation difficulty, and reduces production components; the pilot valve part 200 adopts a 10-diameter servo proportional reversing valve and a proportional electromagnet with an integrated displacement sensor, and the design of the valve sleeve structure conveniently realizes zero covering, and can be used normally in high-frequency response and high-precision occasions. At the same time, through two-stage displacement feedback, the control accuracy is higher and the dynamic performance is better.

[0052] During the operation of the integrated two-way cartridge proportional valve of the utility model, the pilot control oil first enters from the control oil port X of the integrated valve seat 1 and passes to the P port of the servo proportional reversing valve 201 of the pilot valve part 200. When the amplifier component 202 receives the input command, it generates a proportional current to drive the proportional solenoid, thereby pushing the valve core of the pilot valve to move. Depending on the signal, the opening of the valve port and the channel opening of the P port of the servo proportional reversing valve 201 of the pilot valve part 200 connecting to the working oil port M of the pilot valve part 200 or the P port of the servo proportional reversing valve 201 of the pilot valve part 200 connecting to the working oil port N of the pilot valve part 200 are also different. As mentioned above, the linear displacement sensor integrated in the pilot valve will detect and feedback the displacement information of the pilot valve core, compare it with the input signal value, and continuously correct the accuracy of the actual value of the pilot displacement.

[0053] Through the cooperation of the main valve core 102 and the integrated valve seat 101 and the action of the Gly ring 103, a mutually isolated first control chamber 1012 and a second control chamber 1013 are formed in the main valve hole 1011 of the integrated valve seat 101. When there is an input command, the pilot oil enters the two pressure measuring ports of the main valve hole 1011 of the integrated valve seat 101 of the main valve part 100 through the working oil port A and the working oil port B of the pilot valve part 200, and forms a force on the upper and lower end surfaces of the step protrusion 1023 of the main valve core 102, thereby controlling the up and down movement of the main valve core 102. After the main valve part 100 is oiled, the hydraulic oil enters the working oil port A and the working oil port B of the integrated valve seat 101, thereby pushing the far end of the main valve core 102 of the main valve, so that the main valve core 102 moves axially. When the input command changes, the throttle opening of the main valve part 100 also changes continuously.

[0054] Since the main valve core 102 is connected to the displacement sensor in the sensor assembly 1010, the displacement of the main valve core 2 is converted into a displacement signal by the displacement sensor and connected to the amplifier assembly 202 of the pilot valve part 200 through the cable 300. Therefore, when the main valve core 102 moves, the displacement signal is fed back to the pilot valve 200 in real time, and compared with the input signal, the size of the signal is adjusted to form a closed-loop feedback, thereby more accurately controlling the size of the opening, that is, the flow rate of the integrated two-way cartridge proportional valve can be accurately controlled.

[0055] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. An integrated two-way cartridge proportional valve, characterized in that: It includes a main valve and a pilot valve; wherein: The main valve comprises an integrated valve seat, a main valve core, a main valve end cover, a sensor connection end cover and a sensor assembly. A main valve hole with a central axis is provided in the integrated valve seat, the main valve core is located in the main valve hole, the integrated valve seat comprises a distal end face and a proximal end face perpendicular to the central axis, the main valve end cover is fixed to the proximal end face of the integrated valve seat, a step through hole located on the central axis is provided on the main valve end cover, the step through hole comprises a distal through hole and a proximal through hole, a valve core hole is provided in the main valve core, and a spring is provided in the valve core hole; the sensor connection end cover is fixed in the proximal through hole of the main valve end cover, the sensor assembly is fixedly connected to the main valve through the sensor connection end cover, and comprises a measuring rod connecting rod and a displacement sensor, one end of the measuring rod connecting rod passes through the spring and is fixed to the main valve core, and the other end of the measuring rod connecting rod passes through the sensor connection end cover and is connected to the displacement sensor; A pilot valve mounting surface is provided on the side of the integrated valve seat of the main valve for mounting the pilot valve, wherein the pilot valve is a 10-diameter servo proportional reversing valve with a built-in amplifier assembly and a proportional solenoid with an integrated linear displacement sensor; An oil inlet P, a working oil port A, a working oil port B, two communicating oil return ports T, a control oil port X, and a control oil port Y are also provided on the integrated valve seat of the main valve. The oil inlet P is communicated with the control oil port X, and the two oil return ports T are communicated with the control oil port Y. The control oil port X and the control oil port Y are located on the distal end surface of the integrated valve seat, and the working oil port A and the working oil port B are located at the distal end of the main valve core and are communicated with the main valve hole of the integrated valve seat.

2. The one-piece two-way cartridge proportional valve according to claim 1, characterized in that: A step protrusion is provided on the main valve core, and the step protrusion separates the gap between the integrated valve seat of the main valve and the main valve core into a first control chamber and a second control chamber that are isolated from each other.

3. The one-piece two-way cartridge proportional valve according to claim 2, characterized in that: The pilot valve is provided with a working oil port M and a working oil port N, the first control chamber and the second control chamber are respectively communicated with the working oil port M and the working oil port N of the pilot valve, and a working oil port P and a working oil port Q are formed on the main valve hole of the integrated valve seat.

4. The one-piece two-way cartridge proportional valve according to claim 2, characterized in that: The proximal end of the main valve core is inserted into the distal through hole of the main valve end cover, and the proximal end of the main valve core and the inner wall of the main valve end cover form a first contact surface; the step protrusion of the main valve core and the inner wall of the integrated valve seat of the main valve form a second contact surface, and the distal end of the main valve core and the inner wall of the integrated valve seat of the main valve form a third contact surface; a first sealing ring is respectively provided on the first contact surface, the second contact surface and the third contact surface to achieve sealing in the radial movement direction of the main valve core.

5. The one-piece two-way cartridge proportional valve according to claim 4, characterized in that: The first sealing ring is a Gly ring.

6. The one-piece two-way cartridge proportional valve according to claim 1, characterized in that: A connecting portion is arranged at the distal end of the main valve end cover, and the connecting portion is inserted into the proximal end of the main valve hole of the integrated valve seat.

7. The one-piece two-way cartridge proportional valve according to claim 6, characterized in that: A second sealing ring is provided on the contact surface between the connecting portion of the main valve end cover and the inner wall of the integrated valve seat.

8. The one-piece two-way cartridge proportional valve according to claim 1, characterized in that: An annular fixing portion protruding from the main valve end cover is provided on the integrated valve seat, and a first fixing screw for fixing the integrated two-way cartridge proportional valve is provided on the annular fixing portion.

9. The one-piece two-way cartridge proportional valve according to claim 8, characterized in that: The first fixing screws include 8 M24 screws evenly distributed on the annular fixing portion.

10. The one-piece two-way cartridge proportional valve according to claim 9, characterized in that: The control oil port X and the control oil port Y are located on the distal end surface of the annular fixing portion of the integrated valve seat.

11. The one-piece two-way cartridge proportional valve according to claim 1, characterized in that: A fixing threaded hole for fixing the main valve end cover is provided on the proximal end surface of the integrated valve seat and the annular contact surface in contact with the main valve end cover, and a second fixing screw is provided to pass through the main valve end cover and be inserted into the fixing threaded hole.

12. The integrated two-way cartridge proportional valve according to claim 11, characterized in that: The second fixing screws include 14 M16 screws evenly distributed on the annular contact surface.

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