Valve element structure and valve

Abstract

The valve element structure comprises a valve element body and a valve rod, the valve element body is used for being arranged in an inner hole of a sleeve in a sliding mode in the first direction, and a shaft hole is formed in a valve element in a penetrating mode in the first direction; the relative lower end of the valve rod is used for penetrating through the shaft hole, and an annular groove is concavely formed in the peripheral face of the part, extending out of the shaft hole, of the relative lower end of the valve rod and sleeved with an open ring. The part, located above the valve element body, of the valve rod is in threaded connection with a nut set. In the assembling process, the open ring abuts against the bottom end face of the valve element body, the nut set abuts against the top end face of the valve element body, the valve element body is clamped and fixed to the valve rod through the open ring and the nut set, the traditional fixing mode of threads and pins is replaced, the coaxiality between the valve rod and the valve element body is guaranteed, and the valve element body is not prone to being damaged. Vibration generated between the valve element body and the sleeve in the opening and closing process of the valve provided with the valve element structure is avoided, and the stability of the structure is improved.

Description

Technical Field

[0001] This utility model relates to the field of valve technology, specifically to a valve core structure and a valve. Background Technology

[0002] Valves are control components in fluid transport systems, performing functions such as shut-off, regulation, flow guidance, backflow prevention, pressure stabilization, flow diversion, and pressure relief. Existing valves generally include a valve body, valve seat, valve core, and valve stem. The valve body contains a sleeve connecting the inlet and outlet channels. The valve core is movably positioned within the sleeve and moves towards or away from the valve seat under the drive of the valve stem to open or close the inlet and outlet channels. In existing valves, the valve core and valve stem are typically connected using a threaded and pin-based method. During assembly, the end of the valve stem is threaded onto the valve core, and a pin is used to limit relative rotation between the valve stem and valve core. Welding is sometimes used for further fixation. However, with this connection method, the coaxiality of the valve stem and valve core is difficult to control, and the valve core and sleeve are prone to vibration during valve opening and closing, affecting structural stability. Utility Model Content

[0003] In view of this, the present invention provides a valve core structure and a valve to solve the problem that the connection method between the valve core and the valve stem in the existing valve is difficult to control the coaxiality of the valve stem and valve core, which leads to the valve core and sleeve easily vibrating during the opening and closing of the valve.

[0004] In a first aspect, this utility model provides a valve core structure, comprising:

[0005] The valve core body is slidably disposed in the inner hole of the sleeve along the first direction, and the valve core is provided with a shaft hole through the first direction;

[0006] The valve stem has a lower end that passes through the shaft hole. The outer circumferential surface of the lower end of the valve stem extending outside the shaft hole is recessed with an annular groove, and an open ring is fitted into the annular groove. The portion of the valve stem located above the valve core body is threadedly connected to a nut assembly.

[0007] During assembly, the open ring abuts against the bottom end face of the valve core body, and the nut assembly abuts against the top end face of the valve core body.

[0008] According to the valve core structure of this utility model, at least the following beneficial effects are achieved:

[0009] An annular groove is recessed on the outer circumference of the valve stem below the valve core body. An open ring is fitted inside the annular groove, with the outer diameter of the open ring being larger than the diameter of the shaft hole. A nut assembly is threadedly connected to the portion of the valve stem above the valve core body. When connecting and assembling the valve stem and valve core body, the nut assembly is tightened on the portion of the valve stem below the valve core body, causing the nut assembly to move downwards along the first direction towards the open ring to the desired position. This allows the nut assembly to abut against the top surface of the valve core body, and the open ring to abut against the bottom surface of the valve core body. This achieves the purpose of using the open ring and nut assembly to snap and fix the valve core body onto the valve stem, replacing the traditional threaded and pin-fixed method. This ensures the coaxiality between the valve stem and the valve core body, prevents vibration between the valve core body and the sleeve during the opening and closing of the valve equipped with this valve core structure, and improves the stability of the structure.

[0010] In one optional embodiment, the bottom end face of the valve core body is recessed with a mounting hole, the mounting hole is concentrically arranged with the shaft hole, and the mounting hole communicates with the shaft hole; the open ring includes a first semi-circular ring and a second semi-circular ring that are separately arranged; during assembly, the outer peripheral surface of the open ring abuts against the surrounding wall of the mounting hole.

[0011] In one optional embodiment, the outer peripheral surface of the valve stem located above the valve core body is provided with a threaded portion, which matches the nut assembly; the nut assembly is clearance-fitted with the valve stem.

[0012] Secondly, this utility model also provides a valve, including the valve core structure provided in the first aspect above.

[0013] Since the valve includes a valve core structure, it has the same beneficial effects as the valve core structure, so it will not be elaborated here.

[0014] In one optional embodiment, the valve body is further included, with an inlet channel and an outlet channel respectively provided on both sides of the valve body. A sleeve is provided inside the valve body, and the inner hole of the sleeve is used to connect the inlet channel and the outlet channel. A valve seat is provided between the sleeve and the inlet channel. When the valve is in the initial state, the valve core body and the valve seat are in a hard seal fit, and the connection between the inlet channel and the outlet channel is blocked.

[0015] In one optional embodiment, a valve cover is connected to the top of the valve body by a first bolt, and a support cylinder is provided between the valve cover and the sleeve. The top end of the support cylinder abuts against the bottom end of the valve cover, and the bottom end of the support cylinder abuts against the top end of the sleeve. The valve core body is slidably disposed in the inner hole of the support cylinder and the inner hole of the sleeve along a first direction.

[0016] In one optional embodiment, the valve cover is provided with a mounting hole through a first direction, the mounting hole communicating with the inner hole of the support cylinder, and the valve stem is movably disposed in the mounting hole along the first direction.

[0017] In one optional embodiment, the mounting hole is configured as a stepped hole, and the end of the mounting hole away from the support cylinder along the first direction is configured as a large-diameter hole, with a sealing filler provided between the inner wall of the large-diameter hole and the outer wall of the valve stem.

[0018] In one optional embodiment, the end face of the sealing packing opposite to the small-diameter hole of the mounting hole abuts against a pressure sleeve, and the end of the pressure sleeve opposite to the sealing packing abuts against a pressure plate. The pressure plate is detachably connected to the top of the valve cover, and a through hole is formed on the pressure plate along a first direction, through which the valve stem slides along the first direction.

[0019] In one optional embodiment, a positioning element is provided at one end of the sleeve facing the support cylinder, and a positioning groove is provided at one end of the support cylinder facing the sleeve corresponding to the position of the positioning element. The positioning element is inserted into the positioning groove, and a sealing ring is provided between the positioning element and the positioning groove along a first direction.

[0020] And / or, a sealing gasket is provided between the support cylinder and the valve cover;

[0021] And / or, a first sealing ring is provided between the valve cover and the valve body;

[0022] And / or, a second sealing ring is provided between the valve seat and the inlet channel. Attached Figure Description

[0023] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of a valve equipped with a valve core structure according to this embodiment;

[0025] Figure 2 for Figure 1 Enlarged view of point A in the middle;

[0026] Figure 3 This is a schematic diagram of an open-loop structure.

[0027] Explanation of reference numerals in the attached figures:

[0028] 100 - Valve core body, 110 - Mounting hole;

[0029] 200 - Sleeve, 210 - Positioning element, 220 - Sealing ring;

[0030] 300 - Valve stem, 310 - Threaded part;

[0031] 400 - Open ring, 410 - First semicircular ring, 420 - Second semicircular ring;

[0032] 500-nut set;

[0033] 600-Valve body, 610-Inlet channel, 620-Outlet channel, 630-Valve seat, 631-Second sealing ring;

[0034] 700-Valve cover, 710-First bolt, 720-Sealing packing, 730-Pressure sleeve, 740-Pressure plate, 750-First sealing ring, 760-Second bolt;

[0035] 800 - Support cylinder, 810 - Sealing gasket. Detailed Implementation

[0036] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0037] In the description of this embodiment, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this embodiment and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this embodiment. In addition, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0038] In the description of this embodiment, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this embodiment according to the specific circumstances.

[0039] The following is combined with Figures 1 to 3 The following describes embodiments of the present invention.

[0040] According to a first aspect of the present invention, a valve core structure is provided, including a valve core body 100 and a valve stem 300. The valve core body 100 is slidably disposed in the inner hole of a sleeve 200 along a first direction, and the valve core is provided with a shaft hole through the first direction. The lower end of the valve stem 300 is used to pass through the shaft hole, and the outer circumferential surface of the lower end of the valve stem 300 extending outside the shaft hole is recessed with an annular groove, and an open ring 400 is fitted into the annular groove. The portion of the valve stem 300 located above the valve core body 100 is threadedly connected to a nut assembly 500. During assembly, the open ring 400 abuts against the bottom end face of the valve core body 100, and the nut assembly 500 abuts against the top end face of the valve core body 100.

[0041] In this embodiment, the valve core structure features an annular groove recessed on the outer circumferential surface of the valve stem 300 located below the valve core body 100. An open ring 400 is fitted inside the annular groove, with the outer diameter of the open ring 400 being larger than the diameter of the shaft hole. A nut assembly 500 is threadedly connected to the portion of the valve stem 300 located above the valve core body 100. When connecting and assembling the valve stem 300 and the valve core body 100, the nut assembly 500 is tightened on the portion of the valve stem 300 located below the valve core body 100, causing the nut assembly 500 to move downwards along the first direction towards the open ring 400 to the desired position. The positions are such that the nut assembly 500 abuts against the top surface of the valve core body 100, and the open ring 400 abuts against the bottom surface of the valve core body 100; the valve core body 100 is snapped and fixed to the valve stem 300 by the open ring 400 and the nut assembly 500, replacing the traditional threaded and pin-fixed method, ensuring the coaxiality between the valve stem 300 and the valve core body 100, avoiding vibration between the valve core body 100 and the sleeve 200 during the opening and closing of the valve equipped with the valve core structure of this embodiment, and improving the stability of the structure.

[0042] It should be noted that in this embodiment, the valve core body 100 is snapped and fixed onto the valve stem 300 using an open ring 400 and a nut assembly 500. The valve stem 300 and the shaft hole are in a standard hole-shaft fit. The perpendicularity of the outer circumferential surface of the valve core body 100 and the bottom end surface of the valve core body 100 (i.e., the end surface that abuts against the open ring 400) is positively correlated with the coaxiality between the valve stem 300 and the valve core body 100. The perpendicularity of the outer circumferential surface of the valve core body 100 and the bottom end surface of the valve core body 100 is easy to achieve during the machining process. Therefore, the coaxiality between the valve stem 300 and the valve core body 100 is easy to ensure during machining.

[0043] It should be noted that, because this embodiment uses an open ring 400 and a nut assembly 500 to snap and fix the valve core body 100 onto the valve stem 300, replacing the traditional threaded and pin-fixed method, this embodiment does not require drilling pin holes on the valve stem 300, thus improving the overall strength of the valve stem 300.

[0044] It can be understood that the first direction mentioned in the text refers to the axial direction of the valve stem 300. For ease of description, it is referred to as... Figure 1 The first direction in the text is described as the first direction in the text, but it should not be interpreted as a specific limitation on the axial direction of the valve stem 300.

[0045] like Figure 2 and Figure 3 As shown, in some embodiments, the bottom end face of the valve core body 100 is recessed with a mounting hole 110, which is concentrically arranged with the shaft hole and communicates with the shaft hole; the open ring 400 includes a first semi-circular ring 410 and a second semi-circular ring 420 separately arranged; during assembly, the outer peripheral surface of the open ring 400 abuts against the surrounding wall of the mounting hole 110. By separately setting the open ring 400 into a first semi-circular ring 410 and a second semi-circular ring 420, it is convenient to install the open ring 400 into the annular groove of the valve stem 300, and after the open ring 400 abuts against the bottom end face of the valve core body 100, because the outer peripheral surface of the open ring 400 abuts against the surrounding wall of the mounting hole 110, the first semi-circular ring 410 and the second semi-circular ring 420 will not separate from each other and come out of the annular groove when the valve core body 100 and the valve stem 300 are in the assembled connection state; when it is necessary to separate the valve core body 100 and the valve stem 300, the rotating screw The mother assembly 500 causes the nut assembly 500 to move upward a certain distance away from the ring 400 along the first direction, and then moves the valve stem 300 downward relative to the valve core body 100 until the open ring 400 is disengaged from the mounting hole 110. At this time, the first semi-circular ring 410 and the second semi-circular ring 420 can be easily separated from each other and removed from the ring groove, thereby facilitating the disassembly of the valve core body 100, the valve stem 300 and the open ring 400. Compared with the traditional threaded and pin-fixed method, when the assembly accuracy of this embodiment is not up to standard, each part can be disassembled and repaired, improving the positional accuracy.

[0046] like Figure 2 As shown, in some embodiments, the outer peripheral surface of the valve stem 300 located above the valve core body 100 is provided with a threaded portion 310, which matches the nut assembly 500; the nut assembly 500 and the valve stem 300 are clearance-fitted. This arrangement reduces processing difficulty and cost by requiring only a localized threaded portion 310 on the valve stem 300; it also facilitates the removal of the nut assembly 500 from the valve stem 300 after unscrewing it from the threaded portion 310. Compared to the traditional threaded and pin-fixed method, in this embodiment, if the assembly accuracy is substandard, each part can be disassembled and repaired, improving positional accuracy.

[0047] like Figures 1 to 3 As shown, according to a second aspect of the present invention, a valve is also provided, including the valve core structure provided in the first aspect of the present invention. The valve core structure of this embodiment has an annular groove recessed on the outer circumferential surface of the valve stem 300 located below the valve core body 100. An open ring 400 is fitted inside the annular groove, the outer diameter of the open ring 400 being larger than the diameter of the shaft hole. A nut assembly 500 is threadedly connected to the portion of the valve stem 300 located above the valve core body 100. When connecting and assembling the valve stem 300 and the valve core body 100, the nut assembly 500 is tightened on the portion of the valve stem 300 located below the valve core body 100, causing the nut assembly 500 to approach the lower part of the open ring 400 along a first direction. Move the valve core assembly 500 to the desired position so that the nut assembly 500 abuts against the top surface of the valve core body 100 and the open ring 400 abuts against the bottom surface of the valve core body 100. This allows the valve core body 100 to be snapped and fixed onto the valve stem 300 using the open ring 400 and the nut assembly 500, replacing the traditional threaded and pin-fixed method. This ensures the coaxiality between the valve stem 300 and the valve core body 100, avoids vibration between the valve core body 100 and the sleeve 200 during the opening and closing process of the valve in this embodiment, and improves the stability of the structure.

[0048] like Figure 1 As shown, in some embodiments, the valve further includes a valve body 600, with an inlet channel 610 and an outlet channel 620 respectively provided on both sides of the valve body 600. A sleeve 200 is provided inside the valve body 600, and the inner hole of the sleeve 200 is used to connect the inlet channel 610 and the outlet channel 620. A valve seat 630 is provided between the sleeve 200 and the inlet channel 610. When the valve is in the initial state (i.e., the closed state), the valve core body 100 and the valve seat 630 are in a hard seal fit, blocking the connection between the inlet channel 610 and the outlet channel 620. By providing the valve seat 630 at the connection between the inlet channel 610 and the sleeve 200, when the valve stem 300 drives the valve core body 100 to descend to the lowest position, causing the valve to switch to the closed state, the hard seal fit between the valve core body 100 and the valve seat 630 provides a good sealing effect, avoiding leakage even when the valve is switched to the closed state.

[0049] like Figure 1 As shown, in some embodiments, a valve cover 700 is connected to the top of the valve body 600 by a first bolt 710. A support cylinder 800 is provided between the valve cover 700 and the sleeve 200. The top end of the support cylinder 800 abuts against the bottom end of the valve cover 700, and the bottom end of the support cylinder 800 abuts against the top end of the sleeve 200. The valve core body 100 can be slidably disposed in the inner hole of the support cylinder 800 and the inner hole of the sleeve 200 along a first direction. With this arrangement, after the valve cover 700 is connected to the top of the valve body 600 by the first bolt 710, the top pressure applied by the valve cover 700 is applied to the support cylinder 800, and this top pressure is transmitted to the valve seat 630 in sequence through the support cylinder 800 and the sleeve 200, thereby achieving the goal of fixing the valve seat 630 to the valve body 600 without the use of screws or other fasteners.

[0050] Specifically, the valve cover 700 has a connecting hole extending through it in the first direction, which communicates with the inner hole of the support cylinder 800. The valve stem 300 is movably disposed within the connecting hole in the first direction. By allowing the end of the valve stem 300 away from the valve core body 100 to extend through the connecting hole in the first direction to the outside of the valve cover 700, it can be assembled or driven by a driving component to slide up and down within the inner hole of the support cylinder 800 and the inner hole of the sleeve 200.

[0051] In some embodiments, the connecting hole is configured as a stepped hole, and the end of the connecting hole facing away from the support cylinder 800 along the first direction is configured as a large-diameter hole. A sealing packing 720 is provided between the inner wall of the large-diameter hole and the outer wall of the valve stem 300. By filling and sealing the space between the outer wall of the portion of the valve stem 300 located in the large-diameter hole and the inner wall of the large-diameter hole with the sealing packing 720, the interior of the valve body 600 can be better isolated from the outside world, preventing external particles from entering the connecting hole, reducing wear on the valve stem 300, and extending the service life of the valve stem 300.

[0052] Specifically, the end face of the sealing packing 720 facing away from the small-diameter hole of the connecting hole abuts against a pressure sleeve 730. The end of the pressure sleeve 730 facing away from the sealing packing 720 abuts against a pressure plate 740. The pressure plate 740 is detachably connected to the top of the valve cover 700. A through hole is formed on the pressure plate 740 along a first direction, allowing the valve stem 300 to slide through in the first direction. The pressure plate 740 restricts the freedom of movement of the sealing packing 720 towards the small-diameter hole facing away from the connecting hole, ensuring that the sealing packing 720 is tightly filled in the large-diameter hole of the connecting hole. This ensures the sealing effect of filling the gap between the outer wall of the portion of the valve stem 300 located in the large-diameter hole and the inner wall of the large-diameter hole. Simultaneously, the through hole on the pressure plate 740 increases the contact guide area for the valve stem 300's movement along the first direction, improving the stability of the valve stem 300's movement. Furthermore, by detachably connecting the pressure plate 740 to the top of the valve cover 700, the pressure plate 740, valve cover 700, and valve body 600 can be manufactured and disassembled separately.

[0053] This embodiment does not limit the detachable connection structure of the pressure plate 740 and the valve cover 700. In this embodiment, while ensuring the tightness of the connection between the pressure plate 740 and the valve cover 700, the convenience of assembling and disassembling the two is improved. Optionally, the top surface of the valve cover 700 is provided with an internal threaded hole, and the pressure plate 740 is provided with a through hole at the position corresponding to the internal threaded hole. The through hole penetrates the pressure plate 740 along the first direction. During assembly, the second bolt 760 passes through the through hole and is threaded into the internal threaded hole. Of course, this is only a preferred embodiment of the detachable connection structure of the pressure plate 740 and the valve cover 700. In another alternative embodiment, the top surface of the valve cover 700 is provided with a nut, and the pressure plate 740 is provided with a through hole at the position corresponding to the nut. The through hole penetrates the pressure plate 740 along the first direction. During assembly, the second bolt 760 passes through the through hole and is threaded into the second nut.

[0054] In some embodiments, a positioning member 210 protrudes from one end of the sleeve 200 facing the support cylinder 800, and a positioning groove is provided at the end of the support cylinder 800 facing the sleeve 200 corresponding to the position of the positioning member 210. The positioning member 210 is inserted into the positioning groove, and a sealing ring 220 is provided between the positioning member 210 and the positioning groove along a first direction. The cooperation between the positioning groove and the positioning member 210 facilitates the assembly of the support cylinder 800 and the sleeve 200, and the sealing ring 220 between the positioning member 210 and the positioning groove improves the sealing performance.

[0055] Specifically, a sealing gasket 810 is provided between the support cylinder 800 and the valve cover 700 to improve the sealing performance at the connection between the support cylinder 800 and the valve cover 700.

[0056] Specifically, a first sealing ring 750 is provided between the valve cover 700 and the valve body 600. With this arrangement, after the valve cover 700 is connected to the top of the valve body 600 by the first bolt 710, the valve cover 700 applies top pressure to the first sealing ring 750, thereby improving the sealing performance at the contact point between the valve cover 700 and the valve body 600.

[0057] Specifically, a second sealing ring 631 is provided between the valve seat 630 and the inlet channel 610 to improve the sealing performance at the connection between the valve seat 630 and the inlet channel 610.

[0058] Although embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the present invention.

Claims

1. A valve core structure, characterized in that, include: The valve core body (100) is slidably disposed in the inner hole of the sleeve (200) along the first direction, and the valve core is provided with a shaft hole through the first direction; The valve stem (300) has its lower end for passing through the shaft hole. The outer circumferential surface of the lower end of the valve stem (300) extending outside the shaft hole is recessed with an annular groove, and an open ring (400) is fitted into the annular groove. The portion of the valve stem (300) located above the valve core body (100) is threadedly connected to a nut assembly (500). During assembly, the open ring (400) abuts against the bottom end face of the valve core body (100), and the nut assembly (500) abuts against the top end face of the valve core body (100).

2. The valve core structure according to claim 1, characterized in that, The bottom end face of the valve core body (100) is recessed with a mounting hole (110), the mounting hole (110) is concentrically arranged with the shaft hole, and the mounting hole (110) communicates with the shaft hole; the open ring (400) includes a first semi-circular ring (410) and a second semi-circular ring (420) that are separately arranged; during assembly, the outer peripheral surface of the open ring (400) abuts against the surrounding wall of the mounting hole (110).

3. The valve core structure according to claim 1, characterized in that, The valve stem (300) has a threaded portion (310) on its outer peripheral surface located above the valve core body (100). The threaded portion (310) matches the nut assembly (500). The nut assembly (500) is clearance-fitted with the valve stem (300).

4. A valve, characterized in that, Includes a valve core structure according to any one of claims 1 to 3.

5. A valve according to claim 4, characterized in that, It also includes a valve body (600), on which an inlet channel (610) and an outlet channel (620) are respectively provided on both sides. A sleeve (200) is provided inside the valve body (600), and the inner hole of the sleeve (200) is used to connect the inlet channel (610) and the outlet channel (620). A valve seat (630) is provided between the sleeve (200) and the inlet channel (610). When the valve is in the initial state, the valve core body (100) and the valve seat (630) are in hard sealing cooperation, and the connection between the inlet channel (610) and the outlet channel (620) is blocked.

6. A valve according to claim 5, characterized in that, The top of the valve body (600) is connected to a valve cover (700) by a first bolt (710). A support cylinder (800) is provided between the valve cover (700) and the sleeve (200). The top end of the support cylinder (800) abuts against the bottom end of the valve cover (700), and the bottom end of the support cylinder (800) abuts against the top end of the sleeve (200). The valve core body (100) can be slidably disposed in the inner hole of the support cylinder (800) and the inner hole of the sleeve (200) along a first direction.

7. A valve according to claim 6, characterized in that, The valve cover (700) has a through hole along the first direction, the through hole being connected to the inner hole of the support cylinder (800), and the valve stem (300) is movably disposed within the through hole along the first direction.

8. A valve according to claim 7, characterized in that, The connecting hole is configured as a stepped hole, and the end of the connecting hole away from the support cylinder (800) along the first direction is configured as a large-diameter hole. A sealing packing (720) is provided between the inner wall of the large-diameter hole and the outer wall of the valve stem (300).

9. A valve according to claim 8, characterized in that, The sealing packing (720) has a pressure sleeve (730) at the end face opposite to the small diameter hole of the connecting hole. The pressure sleeve (730) has a pressure plate (740) at the end opposite to the sealing packing (720). The pressure plate (740) is detachably connected to the top of the valve cover (700). A through hole is formed on the pressure plate (740) along the first direction, through which the valve stem (300) slides along the first direction.

10. A valve according to claim 6, characterized in that, The sleeve (200) has a positioning element (210) protruding from one end facing the support cylinder (800). The support cylinder (800) has a positioning groove corresponding to the position of the positioning element (210) at one end facing the sleeve (200). The positioning element (210) is inserted into the positioning groove. A sealing ring (220) is provided between the positioning element (210) and the positioning groove along the first direction. And / or, a sealing gasket (810) is provided between the support cylinder (800) and the valve cover (700); And / or, a first sealing ring (750) is provided between the valve cover (700) and the valve body (600); And / or, a second sealing ring (631) is provided between the valve seat (630) and the inlet channel (610).

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