Main valve element and cartridge valve structure

Abstract

The utility model relates to a main valve element which comprises a main valve element upper section, a main valve element lower section and a gasket. A first inner cavity is formed in the lower section of the main valve element, a reducing part and a first oil hole are formed in the lower portion of the lower section of the main valve element, and the first oil hole is communicated with a space formed by the reducing part and the first inner cavity. A second inner cavity is formed in the main valve element upper section, an annular groove and an oil outlet groove extending upwards from the annular groove are formed in the outer side face of the main valve element upper section, a second oil hole is formed in the groove bottom of the annular groove and communicates with the second inner cavity and the annular groove, and the depth of the oil outlet groove is gradually shallower from bottom to top; the lower end of the main valve element upper section and the upper end of the main valve element lower section are detachably and fixedly connected together, and the gasket is clamped between the lower end face of the main valve element upper section and the upper end face of the main valve element lower section. The utility model further provides a cartridge valve structure. The disassembly scheme of the main valve element is improved, the performance and the operation stability of the main valve element can be guaranteed, and the difficulty and the cost for adjusting the structure of the main valve element can be reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of hydraulic valves, in particular to a main valve core and a cartridge valve structure. Background Art

[0002] In order to increase the flow rate of the pilot balancing valve, there is a technology that sets the main valve of the pilot balancing valve into a cartridge valve structure. By replacing the main valve core and the main valve sleeve of different sizes to adjust the diameter of the main valve, the flow rate of the pilot balancing valve can be easily adjusted, and a large flow rate pilot balancing valve can be easily realized. In order to improve the stability of the pilot balancing valve, there is a technology that adds compensation characteristics to the feedback valve port of the above-mentioned cartridge valve structure.

[0003] like Figure 3 and Figure 4 As shown, the above-mentioned cartridge valve structure includes a valve body 1, a valve cover 2, a main valve sleeve 3, a main valve core 4 and a main valve spring 6. The valve body 1 is provided with a main valve chamber 12 with an upper opening, an oil inlet channel 11 for conveying hydraulic oil to the main valve chamber 12, and an oil return channel 13 for outputting hydraulic oil from the main valve chamber 12. The valve cover 2 is provided with a back pressure chamber 22 with a lower opening and a feedback oil channel 21 for connecting the back pressure chamber 22 and the pilot valve. The valve body 1 and the valve cover 2 are detachably fixed together by bolts, and the back pressure chamber 22 is coaxially arranged with the main valve chamber 12. The main valve sleeve 3 and the main valve core 4 are inserted in the main valve cavity 12. The valve sleeve forms a valve sleeve inner cavity 31 with openings at both ends. The upper end of the valve sleeve inner cavity 31 is opened as the main valve feedback oil port 33, and the lower end of the valve sleeve is opened as the main valve return oil port. The lower part of the valve sleeve inner cavity 31 is provided with a main valve port 32. The main valve core 4 is slidably matched with the valve sleeve inner cavity 31. The lower part of the main valve core 4 is provided with a reduced diameter portion 411 and a sealing portion 412 matched with the main valve port 32. A pressure storage chamber is formed between the reduced diameter portion 411 and the valve sleeve. The side wall of the valve sleeve is provided with a pressure storage chamber for supplying oil from the main valve. The hydraulic oil input from the oil inlet channel 11 enters the main valve oil inlet port 34 of the pressure accumulation chamber. The main valve spring 6 is located in the back pressure chamber 22. The main valve spring 6 pushes the main valve core 4 downward. The main valve spring 6 provides a preload force for the sealing portion 412 to close the main valve port 32. A main valve core oil channel 43 is provided in the main valve core 4. When the main valve core 4 moves upward to allow the sealing portion 412 to open the main valve port 32, the pressure accumulation chamber is connected with the back pressure chamber 22 through the main valve core oil channel 43 and the main valve feedback oil port 33. The main valve port 32 is connected with the pressure accumulation chamber and the main valve return oil port. Figure 4As shown, the main valve core oil passage 43 includes a main valve core cavity 432 arranged inside the main valve core 4, a plurality of first oil holes 431 connecting the main valve core cavity 432 and the pressure storage cavity, an annular groove 434 arranged on the outer wall of the upper end of the main valve core 4, a plurality of second oil holes 433 connecting the annular groove 434 and the main valve core cavity 432, and a plurality of oil outlet grooves 435 arranged on the outer wall of the upper end of the main valve core 4, the lower ends of the plurality of oil outlet grooves 435 are connected with the annular groove 434, the depths of the plurality of oil outlet grooves 435 gradually deepen from top to bottom, when the sealing portion 412 opens the main valve port 32, the upper end of the main valve core 4 extends upward into the back pressure cavity 22, the plurality of oil outlet grooves 435 are connected with the back pressure cavity 22, the plurality of oil outlet grooves 435 constitute a feedback valve port with a gradually changing flow area, that is, the greater the length of the upper end of the main valve core 4 extending upward from the main valve cavity 12, the greater the flow area of ​​the feedback valve port, so that the feedback valve port increases the compensation characteristics. In the above-mentioned cartridge valve structure, the flow rate of the cartridge valve structure can be adjusted by changing the size of the main valve core 4 and the main valve sleeve 3, thereby adjusting the flow rate of the pilot balancing valve. By adding compensation characteristics to the feedback valve port, the stability of the pilot balancing valve can be improved.

[0004] The above-mentioned cartridge valve structure has the following technical problems:

[0005] The main valve core 4 is composed of a main valve core body 41 and a plug 42. In order to ensure the sealing performance between the plug 42 and the main valve core body 41, there is usually a certain interference between the plug 42 and the main valve core body 41. When the plug 42 has a dimensional deviation and causes a large interference, it is easy to cause the upper end of the main valve core body 41 to deform, which has an adverse effect on the performance and operation of the cartridge valve structure.

[0006] When the compensation characteristic of the feedback valve port needs to be adjusted, the entire main valve core 4 needs to be replaced, which is very costly. Utility Model Content

[0007] The purpose of the utility model is to provide a main valve core and a cartridge valve structure to alleviate or eliminate at least one of the above-mentioned technical problems.

[0008] The utility model discloses a main valve core, comprising an upper section of the main valve core, a lower section of the main valve core and a gasket; a first inner cavity with an upper opening is arranged in the lower section of the main valve core, a reduced diameter portion and a plurality of first oil holes are arranged at the lower part of the lower section of the main valve core, and the plurality of first oil holes are connected with the space formed by the reduced diameter portion and the first inner cavity; a second inner cavity with a lower opening is arranged in the upper section of the main valve core, an annular groove and an oil outlet groove extending upward from the annular groove are arranged on the outer side surface of the upper section of the main valve core, and a groove bottom of the annular groove is provided with A plurality of second oil holes are provided, wherein the plurality of second oil holes are connected to the second inner cavity and the annular groove, and the depth of the oil outlet groove gradually becomes shallower from bottom to top; the lower end of the main valve core upper section and the upper end of the main valve core lower section are detachably fixedly connected together, the lower end opening of the second inner cavity is connected to the upper end opening of the first inner cavity, and the gasket is clamped between the lower end surface of the main valve core upper section and the upper end surface of the main valve core lower section to form a seal between the lower end surface of the main valve core upper section and the upper end surface of the main valve core lower section.

[0009] Optionally, a connecting groove is provided at the lower end of the second inner cavity, and a connecting portion protruding upward from an upper end surface of the lower section of the main valve core is provided at the upper end of the lower section of the main valve core, and the connecting portion is detachably connected to the connecting groove.

[0010] Optionally, the connecting portion and the connecting groove are detachably fixedly connected via a rotating snap-fit ​​structure.

[0011] Optionally, the rotating clamping structure includes a clamping groove arranged on the groove wall of the connecting groove and a clamping foot arranged on the connecting part, the clamping groove includes a first groove section extending along the circumference of the connecting groove and a second groove section extending downward from one end of the first groove section and passing through the lower end surface of the upper section of the main valve core, and the clamping foot can be clamped into the other end of the first groove section through the second groove section and the first groove section.

[0012] Optionally, the lower end portion of the lower section of the main valve core is configured as a guide portion whose diameter gradually decreases from top to bottom, and a guide groove is provided on the guide portion.

[0013] Optionally, a sealing portion for cooperating with a main valve port on a main valve sleeve is provided at the lower portion of the lower section of the main valve core.

[0014] Optionally, an upwardly protruding spring positioning portion is provided on the upper end surface of the upper section of the main valve core.

[0015] Optionally, a sealing ring installation groove is provided on the outer side surface of the upper section of the main valve core, and the sealing ring installation groove is located at the lower side of the annular groove.

[0016] Optionally, a plurality of oil outlet grooves are provided on the outer surface of the upper section of the main valve core.

[0017] The utility model also provides a cartridge valve structure, comprising the main valve core described in any one of the above items.

[0018] The utility model improves the disassembly scheme of the main valve core, helps to ensure the performance and operation stability of the main valve core, and also helps to reduce the difficulty and cost of adjusting the structure of the main valve core. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of the main valve core described in some embodiments;

[0020] Figure 2 It is a structural schematic diagram of the main valve core lower section and the main valve core upper section described in some embodiments;

[0021] Figure 3 It is a structural schematic diagram of the cartridge valve structure described in the background technology;

[0022] Figure 4 It is a structural schematic diagram of the main valve core described in the background technology.

[0023] Some of the serial numbers are: 5-main valve core; 51-lower section of main valve core; 52-upper section of main valve core; 53-gasket; 54-sealing ring;

[0024] 511-reduced diameter portion; 512-conical surface; 513-sealing portion; 514-flow guide portion; 515-first oil hole; 516-first inner cavity; 517-first end surface; 518-connecting portion; 519-pin;

[0025] 521 - second inner cavity; 522 - second oil hole; 523 - annular groove; 524 - oil outlet groove; 525 - spring positioning portion; 526 - second end surface; 527 - connecting groove; 528 - clamping groove; 529 - sealing ring installation groove. DETAILED DESCRIPTION

[0026] The following will describe the implementation of the present invention with reference to the accompanying drawings and preferred embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific implementations, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be understood that the preferred embodiments are only for illustrating the present invention, not for limiting the scope of protection of the present invention.

[0027] It should be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present invention, and thus the drawings only show components related to the present invention rather than being drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed at will, and the component layout may also be more complicated.

[0028] like Figure 1 and Figure 2 The main valve core 5 shown in the figure comprises a main valve core upper section 52, a main valve core lower section 51 and a gasket 53; a first inner cavity 516 with an upper opening is arranged in the main valve core lower section 51, a reduced diameter portion 511 and a plurality of first oil holes 515 are arranged at the lower part of the main valve core lower section 51, and the plurality of first oil holes 515 are connected with the space formed by the reduced diameter portion 511 and the first inner cavity 516; a second inner cavity 521 with a lower opening is arranged in the main valve core upper section 52, and an annular groove 523 and an oil outlet groove 524 extending upward from the annular groove 523 are arranged on the outer side surface of the main valve core upper section 52, and the annular groove 523 is provided. A plurality of second oil holes 522 are provided at the bottom of the groove 523, and the plurality of second oil holes 522 are connected to the second inner cavity 521 and the annular groove 523, and the depth of the oil outlet groove 524 gradually becomes shallower from bottom to top; the lower end of the main valve core upper section 52 and the upper end of the main valve core lower section 51 are detachably fixedly connected together, and the lower end opening of the second inner cavity 521 is connected to the upper end opening of the first inner cavity 516, and the gasket 53 is clamped between the lower end surface of the main valve core upper section 52 and the upper end surface of the main valve core lower section 51 to form a seal between the lower end surface of the main valve core upper section 52 and the upper end surface of the main valve core lower section 51.

[0029] By adopting the above technical solution, the disassembly solution of the main valve core 5 is improved, and the gasket 53 is used to form a seal between the main valve core upper section 52 and the main valve core lower section 51. The force of the main valve core upper section 52 and the main valve core lower section 51 to clamp the gasket 53 is set along the axial direction of the main valve core 5, and will not cause adverse effects on the radial size of the main valve core 5. While ensuring the sealing performance between the main valve core upper section 52 and the main valve core lower section 51, the performance and operation stability of the main valve core 5 can be guaranteed. In addition, since the oil outlet groove 524 and the annular groove 523 are set on the main valve core upper section 52, the size of the oil outlet groove 524 can be adjusted by replacing different main valve core upper sections 52, which reduces the difficulty and cost of adjusting the structure of the main valve core 5.

[0030] As a specific example, a connecting groove 527 is provided at the lower end of the second inner cavity 521, and the connecting groove 527 is coaxially arranged with the second inner cavity 521. A connecting portion 518 protruding upward from the upper end surface of the main valve core lower section 51 is provided at the upper end of the main valve core lower section 51. The connecting portion 518 is arranged around the upper end of the first inner cavity 516, and the connecting portion 518 extends into the connecting groove 527 and is detachably connected to the connecting groove 527. The upper end surface of the main valve core lower section 51 is a first end surface 517 surrounding the periphery of the connecting portion 518, and the lower end surface of the main valve core upper section 52 is a second end surface 526 surrounding the periphery of the connecting groove 527. The gasket 53 surrounds the periphery of the connecting portion 518, and the gasket 53 is clamped between the first end surface 517 and the second end surface 526.

[0031] In some embodiments, the connection portion 518 and the connection groove 527 are detachably fixedly connected via a rotating clamping structure. The rotating clamping structure is easy to assemble, and the washer 53 can be used to ensure the stability of the rotating clamping structure.

[0032] In some embodiments, the rotating clamping structure includes a clamping groove 528 provided on the groove wall of the connecting groove 527 and a clamping foot 519 provided on the connecting portion 518. The clamping groove 528 includes a first groove section extending along the circumference of the connecting groove 527 and a second groove section extending downward from one end of the first groove section and penetrating the lower end surface of the main valve core upper section 52. The clamping foot 519 can be clamped into the other end of the first groove section through the second groove section and the first groove section. In a specific implementation, a plurality of clamping grooves 528 can be provided on the groove wall of the connecting groove 527, and a plurality of clamping feet 519 respectively clamped with the plurality of clamping grooves 528 can be provided on the connecting portion 518. In specific implementation, the clamping foot 519 can be clamped into the second groove section through the lower end of the second groove section. After the clamping foot 519 slides into the first groove section through the second groove section, the main valve core upper section 52 and the main valve core lower section 51 rotate relative to each other, so that the clamping foot 519 can slide to the other end of the first groove section, thereby realizing the clamping connection between the connecting portion 518 and the connecting groove 527. The gasket 53 is supported between the first end face 517 and the second end face 526, so that the clamping foot 519 can be pressed against the groove wall of the first groove section along the axial direction of the main valve core 5, ensuring that the main valve core upper section 52 and the main valve core lower section 51 are firmly connected. The above technical solution can prevent the connection structure between the connecting portion 518 and the connecting groove 527 from causing adverse effects on the radial dimensions of the main valve core 5.

[0033] In some embodiments, the lower end of the main valve core lower section 51 is provided with a guide portion 514 whose diameter gradually decreases from top to bottom, and a guide groove is provided on the guide portion 514, and the guide portion 514 is located at the lower side of the sealing portion 513. The guide groove is provided on the guide portion 514 to form an overlapping cone valve structure, which can reduce the possibility of leakage of the cartridge valve structure and extend the life of the cartridge valve structure.

[0034] In some embodiments, a sealing portion 513 for cooperating with a main valve port on a main valve sleeve is disposed at the lower portion of the main valve core lower section 51. The sealing portion 513 is generally provided with a conical surface with a gradually decreasing diameter from top to bottom.

[0035] In some embodiments, an upwardly protruding spring positioning portion 525 is provided on the upper end surface of the main valve core upper section 52. The spring positioning portion 525 is used to extend into the lower end of the main valve spring to define the position of the lower end of the main valve spring, which helps to ensure the stable operation of the main valve spring.

[0036] In some embodiments, a sealing ring installation groove 529 is provided on the outer side of the main valve core upper section 52, and the sealing ring installation groove 529 is located at the lower side of the annular groove 523. The sealing ring installation groove 529 is used to install a sealing ring 54, and the sealing ring 54 is used to form a seal between the main valve core 5 and the main valve sleeve, which helps to improve the sealing performance of the cartridge valve structure.

[0037] In some embodiments, a plurality of oil outlet grooves 524 are provided on the outer side surface of the main valve core upper section 52. Providing a plurality of oil outlet grooves 524 can achieve more uniform oil outlet.

[0038] In some embodiments, the reduced diameter portion 511 is located on the upper side of the sealing portion 513, and the upper side of the reduced diameter portion 511 is a conical surface 512 whose diameter gradually decreases from top to bottom, and the first oil hole 515 is provided on the conical surface 512. Providing the above-mentioned conical surface 512 can reduce the difficulty of processing the first oil hole 515.

[0039] In a specific implementation, the gasket 53 may be an annular flexible gasket, such as a rubber gasket; the gasket 53 may also be an annular rigid gasket, such as a metal gasket.

[0040] The utility model also proposes a cartridge valve structure, including a valve body, a valve cover, a main valve sleeve, a main valve spring and the main valve core 5 described in any one of the above items, the valve body is provided with a main valve chamber with an upper opening, an oil inlet channel for conveying hydraulic oil to the main valve chamber and an oil return channel for outputting hydraulic oil from the main valve chamber, the valve cover is provided with a back pressure chamber with a lower opening and a feedback oil channel for connecting the back pressure chamber and the pilot valve, the valve body and the valve cover are detachably fixed together by bolts, and the back pressure chamber is coaxially arranged with the main valve chamber. The main valve sleeve and the main valve core 5 are inserted in the main valve cavity. The valve sleeve forms a valve sleeve inner cavity with upper and lower ends opened. The upper end opening of the valve sleeve inner cavity is the main valve feedback oil port, and the lower end opening of the valve sleeve is the main valve return oil port. The lower part of the valve sleeve inner cavity is provided with a main valve port. The main valve core 5 is slidably matched with the valve sleeve inner cavity. The lower part of the main valve core 5 is provided with a reduced diameter section and a sealing portion 513 matched with the main valve port. A pressure storage chamber is formed between the reduced diameter section and the valve sleeve. A pressure storage chamber is provided on the side wall of the valve sleeve for supplying oil from the inlet. The hydraulic oil input from the oil channel enters the main valve oil inlet of the pressure accumulation chamber. The main valve spring is located in the back pressure chamber. The main valve spring pushes the main valve core 5 downward. The main valve spring provides a preload force for the sealing part 513 to close the main valve port. The main valve core 5 is provided with a main valve core 5 oil channel. When the main valve core 5 moves upward to make the sealing part 513 open the main valve port, the pressure accumulation chamber is connected with the back pressure chamber through the main valve core 5 oil channel and the main valve feedback oil port, and the main valve port is connected with the pressure accumulation chamber and the main valve oil return port. The oil passage of the main valve core 5 includes an inner cavity of the main valve core 5 arranged inside the main valve core 5, a plurality of first oil holes 515 connecting the inner cavity of the main valve core 5 and the pressure storage cavity, an annular groove 523 arranged on the outer wall of the upper end portion of the main valve core 5, a plurality of second oil holes 522 connecting the annular groove 523 and the inner cavity of the main valve core 5, and a plurality of oil outlet grooves 524 arranged on the outer wall of the upper end portion of the main valve core 5, the lower ends of the plurality of oil outlet grooves 524 are connected with the annular groove 523, the depths of the plurality of oil outlet grooves 524 gradually deepen from top to bottom, when the sealing portion 513 opens the main valve port, the upper end portion of the main valve core 5 extends upward into the back pressure cavity, the plurality of oil outlet grooves 524 are connected with the back pressure cavity, the plurality of oil outlet grooves 524 constitute a feedback valve port with a gradually changing flow area, that is, the greater the length by which the upper end portion of the main valve core 5 extends upward from the main valve cavity, the greater the flow area of ​​the feedback valve port, so that the feedback valve port increases the compensation characteristic.

[0041] With the above-mentioned cartridge valve structure, when the hydraulic oil in the pressure accumulator cavity drives the main valve core 5 to move upward, the sealing part 513 opens the main valve port, and a part of the hydraulic oil in the pressure accumulator cavity enters the back pressure cavity through the oil passage of the main valve core 5, and then is delivered to the pilot valve through the feedback oil passage, and another part of the hydraulic oil in the pressure accumulator cavity returns to the oil tank through the main valve port, the main valve oil return port, and the oil return oil passage. When the hydraulic oil in the pressure accumulator cavity is not enough to drive the main valve core 5 to move upward, the sealing part 513 closes the main valve port, the pressure accumulator cavity and the back pressure cavity are disconnected, and the pressure accumulator cavity and the main valve oil return port are disconnected.

[0042] In specific implementation, the valve body, valve cover, main valve sleeve and main valve spring can refer to Figure 3 and Figure 4 The implementation will not be elaborated here.

[0043] The above embodiments are only preferred embodiments for fully illustrating the present utility model, and the protection scope of the present utility model is not limited thereto. Equivalent substitutions or changes made by technicians in the technical field on the basis of the present utility model are all within the protection scope of the present utility model. In the description of this specification, the description of reference terms "one embodiment", "some embodiments", "example", "specific example" or "some examples" means that the specific features, structures, materials or characteristics of the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine the different embodiments or examples described in this specification.

Claims

1. A main valve core, characterized in that: It includes a main valve core upper section, a main valve core lower section and a gasket; The lower section of the main valve core is provided with a first inner cavity with an upper end opening, and the lower part of the lower section of the main valve core is provided with a reduced diameter portion and a plurality of first oil holes, and the plurality of first oil holes communicate with the space formed by the reduced diameter portion and the first inner cavity; The upper section of the main valve core is provided with a second inner cavity with an opening at the lower end, the outer side surface of the upper section of the main valve core is provided with an annular groove and an oil outlet groove extending upward from the annular groove, the bottom of the annular groove is provided with a plurality of second oil holes, the plurality of second oil holes communicate with the second inner cavity and the annular groove, and the depth of the oil outlet groove gradually becomes shallower from bottom to top; The lower end of the upper section of the main valve core and the upper end of the lower section of the main valve core are detachably fixedly connected together, the lower end opening of the second inner cavity is connected to the upper end opening of the first inner cavity, and the gasket is clamped between the lower end surface of the upper section of the main valve core and the upper end surface of the lower section of the main valve core to form a seal between the lower end surface of the upper section of the main valve core and the upper end surface of the lower section of the main valve core.

2. The main valve core according to claim 1, characterized in that: A connecting groove is disposed at the lower end of the second inner cavity, and a connecting portion protruding upward from the upper end surface of the lower section of the main valve core is disposed at the upper end of the lower section of the main valve core, and the connecting portion is detachably connected to the connecting groove.

3. The main valve core according to claim 2, characterized in that: The connecting portion and the connecting groove are detachably fixedly connected via a rotating clamping structure.

4. The main valve core according to claim 3, characterized in that: The rotating clamping structure includes a clamping groove arranged on the groove wall of the connecting groove and a clamping foot arranged on the connecting part. The clamping groove includes a first groove section extending along the circumference of the connecting groove and a second groove section extending downward from one end of the first groove section and passing through the lower end surface of the upper section of the main valve core. The clamping foot can be clamped into the other end of the first groove section through the second groove section and the first groove section.

5. The main valve core according to claim 1, characterized in that: The lower end of the lower section of the main valve core is configured as a guide portion whose diameter gradually decreases from top to bottom, and a guide groove is provided on the guide portion.

6. The main valve core according to claim 1, characterized in that: The lower part of the lower section of the main valve core is provided with a sealing part for cooperating with the main valve port on the main valve sleeve.

7. The main valve core according to claim 1, characterized in that: A spring positioning portion protruding upward is arranged on the upper end surface of the upper section of the main valve core.

8. The main valve core according to claim 1, characterized in that: A sealing ring installation groove is arranged on the outer side surface of the upper section of the main valve core, and the sealing ring installation groove is located at the lower side of the annular groove.

9. The main valve core according to claim 1, characterized in that: A plurality of oil outlet grooves are arranged on the outer side surface of the upper section of the main valve core.

10. A cartridge valve structure, characterized in that: Comprising the main valve core according to any one of claims 1 to 9.

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