Valve

Abstract

The utility model discloses a valve and belongs to the technical field of oil and gas exploitation, the valve comprises a valve body, a valve plate, a first valve rod, a second valve rod and a linear transmission assembly, the valve body is provided with a valve cavity, the valve plate is movably installed in the valve cavity, the first valve rod is fixedly connected to the first end of the valve plate, and the second valve rod is fixedly connected to the second end of the valve plate; the second valve rod is fixedly connected to the second end of the valve plate, and an automatic driving device can be arranged at the end, away from the valve plate, of the first valve rod in a matched mode. The linear transmission assembly comprises a moving part and a rotating part, the rotating part is in transmission connection with the moving part, and the end, away from the valve plate, of the second valve rod is detachably and fixedly connected with one end of the moving part. The valve can be respectively driven in an automatic driving mode and a manual driving mode, and the manual driving mode and the automatic driving mode of the valve are mutually independent, so that the valve has the respective advantages of the manual opening and closing mode and the automatic opening and closing mode.

Description

Technical Field

[0001] This application belongs to the field of oil and gas extraction technology, and specifically relates to a valve. Background Technology

[0002] Flat plate valves are widely used in oil and gas extraction equipment. The main switching methods for flat plate valves typically include manual and hydraulic operation. Manual operation is simple and flexible, requiring no additional equipment; however, it suffers from drawbacks such as low output torque and slow switching speed. Automatic switching methods, such as hydraulic operation, offer high output torque and fast switching speed, and can be remotely controlled. However, in cases of hydraulic system supply failure, the valve cannot be opened or closed properly, potentially leading to safety accidents. Therefore, there is an urgent need for a valve that combines the advantages of both manual and automatic switching methods. Utility Model Content

[0003] The purpose of this application is to provide a valve that can be opened and closed by automatic and manual actuation, respectively, and the manual and automatic actuation methods of the valve are independent of each other, so that the valve has the advantages of both manual and automatic switching methods.

[0004] This application discloses a valve, which includes a valve body, a valve plate, a first valve stem, a second valve stem, and a linear transmission assembly, wherein...

[0005] The valve body has a valve cavity, the valve plate is movably installed in the valve cavity, the first valve stem is fixedly connected to the first end of the valve plate, the second valve stem is fixedly connected to the second end of the valve plate, and an automatic drive device may be provided at the end of the first valve stem away from the valve plate.

[0006] The linear transmission assembly includes a moving part and a rotating part, the rotating part being drivenly connected to the moving part, and the end of the second valve stem away from the valve plate being detachably fixedly connected to one end of the moving part.

[0007] This application discloses a valve, which includes a valve body. A valve plate is movably installed in the valve cavity of the valve body, and a first valve stem and a second valve stem are fixedly connected to opposite first and second ends of the valve plate, respectively. The end of the first valve stem away from the valve plate may be equipped with an automatic drive device, and the end of the second valve stem away from the valve plate is fixedly connected to one end of a moving part in a linear transmission assembly. At the same time, in the linear transmission assembly, the moving part and the rotating part are connected in a transmission connection. Therefore, in the valve disclosed in this application, the valve can be opened and closed by using an automatic drive device to drive the valve through the first valve stem, or the second valve stem can be manually driven to move the valve plate relative to the valve body by manually rotating the rotating part in the linear transmission assembly, which can also enable the valve to open and close.

[0008] Furthermore, in the valve disclosed in this application embodiment, the moving part and the second valve stem are detachably connected to each other. This makes the automatic drive mode and the manual drive mode of the valve independent of each other. Thus, when the valve plate is driven by the automatic drive device, the second valve stem can be separated from the moving part, so that the automatic drive device will not indirectly drive the linear transmission component to work passively. This ensures that the driving efficiency of the automatic drive device is still relatively high. Correspondingly, when it is necessary to use the manual drive valve plate to open and close, the second valve stem and the moving part can be reconnected, and the second valve stem can be driven to move the valve plate by rotating the rotating part. Attached Figure Description

[0009] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0010] Figure 1 This is a schematic diagram of the valve structure disclosed in an embodiment of this application.

[0011] Figure label:

[0012] 1-Automatic drive device, 2-Second valve stem, 3-Support cylinder, 4-Connecting rod, 5-Moving part, 6-Bearing, 7-Pressure cap, 8-Rotating handwheel, 9-Locking rod. Detailed Implementation

[0013] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0014] The terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such use of data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class and the number of objects is not limited; for example, a first object can be one or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0015] like Figure 1As shown in the figure, this application discloses a valve that can be applied to fracturing equipment, etc., as a pipeline on / off control device. The valve includes a valve body, a valve plate, a first valve stem, a second valve stem 2, and a linear transmission assembly. Of course, the valve may also include other structures such as a valve seat; for the sake of brevity, these will not be described in detail here.

[0016] The valve body is the main structure of the valve, and it has a valve cavity. Naturally, flow channels communicating with the valve cavity are provided on opposite sides of the valve cavity. Fluids and other media can pass through the flow channel on one side of the valve cavity and flow to the flow channel on the other side. Correspondingly, when it is necessary to restrict the flow of fluid between the flow channels on opposite sides of the valve cavity, the valve plate can be controlled to move relative to the valve body, thereby blocking the valve cavity of the valve body. That is, in the valve disclosed in the embodiments of this application, the valve body is movably installed in the valve cavity, and the valve body can move linearly relative to the valve cavity under the action of external force, achieving the purpose of blocking and opening the valve cavity.

[0017] In detail, the components in the valve that directly drive the valve plate to move linearly relative to the valve body are the first valve stem and the second valve stem 2. The first valve stem is fixedly connected to the first end of the valve plate, and the second valve stem 2 is fixedly connected to the second end of the valve plate. To illustrate, taking the valve plate's vertical movement relative to the valve body as an example, one of the first valve stem and the second valve stem 2 can be located on the upper side of the valve plate, and the other on the lower side. Of course, the ends of both the first valve stem and the second valve stem 2 that are away from the valve plate can extend beyond the valve body, ensuring that external driving equipment or personnel can connect or cooperate with the first valve stem or the second valve stem 2 to drive the valve plate to move relative to the valve body.

[0018] More specifically, in the valve body, T-slots can also be provided on both sides of the valve cavity. Intuitively speaking, the above-mentioned flow channels can be provided on both the left and right sides of the valve cavity, and T-slots can be provided on both the upper and lower sides. The first valve stem and the second valve stem 2 are installed in the two T-slots in a one-to-one correspondence, and a part of each of the first valve stem and the second valve stem 2 extends out of the T-slot.

[0019] To improve the overall performance of the valve disclosed in this application, an automatic drive device 1 can be installed at the end of the first valve stem furthest from the valve plate during valve use. This automatic drive device 1 can then drive the valve plate, thereby opening and closing the valve. Optionally, the automatic drive device 1 can be a linear drive mechanism such as a linear motor or linear cylinder. Alternatively, the automatic drive device 1 can also include a rotary motor and a transmission mechanism to convert the rotary drive of the rotary motor into a linear drive. To reduce assembly difficulty and cost, and improve valve reliability, in another embodiment of this application, the automatic drive device 1 is a hydraulic drive device.

[0020] Specifically, a hydraulic drive device typically includes a cylinder body, a cylinder head, and a piston. The cylinder body and cylinder head are connected to form a piston chamber. The piston is movably installed in the piston chamber. By connecting the first valve stem to the piston and by setting hydraulic oil ports at the upper and lower ends of the cylinder body, the piston can be driven to move in the piston chamber under the action of an external hydraulic oil supply system. This can then drive the first valve stem to move relative to the cylinder body, thereby completing the opening and closing of the valve plate.

[0021] Meanwhile, the valve disclosed in this application also has the ability to be manually opened and closed. Specifically, the linear transmission assembly includes a moving part 5 and a rotating part, and the rotating part and the moving part 5 are connected by a transmission connection. By fixing the end of the second valve stem 2 away from the valve plate to one end of the moving part 5, the moving part 5 can be driven to move linearly relative to the valve body when the rotating part is manually driven to rotate relative to the valve body, thereby driving the valve plate to move relative to the valve body and completing the opening and closing action of the valve plate.

[0022] Furthermore, to prevent the valve plate from driving the second valve stem 2 to move along with it during the movement of the valve plate driven by the automatic drive device 1, thereby causing the linear transmission component to work passively and adversely affecting the driving efficiency and other parameters of the automatic drive device 1, in the valve disclosed in this application embodiment, the second valve stem 2 and the moving part 5 are fixedly connected in a detachable manner. Specifically, the second valve stem 2 and the moving part 5 can be connected to each other by a connecting part such as a threaded sleeve, and the rotating part can drive the moving part 5 to rotate relative to the second valve stem 2, realizing the purpose of assembling and disassembling the second valve stem 2 and the moving part 5. Correspondingly, when the rotating part rotates relative to the moving part 5, the moving part 5 can be driven to drive the second valve stem 2 and the valve plate to move linearly relative to the valve body.

[0023] This application discloses a valve, which includes a valve body. A valve plate is movably installed in the valve cavity of the valve body, and a first valve stem and a second valve stem 2 are fixedly connected to opposite first and second ends of the valve plate, respectively. The end of the first valve stem away from the valve plate may be equipped with an automatic drive device 1, and the end of the second valve stem 2 away from the valve plate is fixedly connected to one end of a moving part 5 in a linear transmission assembly. At the same time, in the linear transmission assembly, the moving part 5 is connected to a rotating part for transmission. Therefore, in the valve disclosed in this application, the automatic drive device 1 can be used to drive the valve to complete the opening and closing work through the first valve stem, or the second valve stem 2 can be manually driven to move the valve plate relative to the valve body by manually rotating the rotating part in the linear transmission assembly, which can also enable the valve to complete the opening and closing work.

[0024] Furthermore, in the valve disclosed in this application embodiment, the moving part 5 and the second valve stem 2 are detachably connected to each other. This makes the automatic drive mode and the manual drive mode of the valve independent of each other. Thus, when the valve plate is driven by the automatic drive device 1, the second valve stem 2 can be separated from the moving part 5, so that the automatic drive device 1 will not indirectly drive the linear transmission component to work passively. This ensures that the driving efficiency of the automatic drive device 1 is still relatively high. Correspondingly, when it is necessary to manually drive the valve plate to open and close, the second valve stem 2 and the moving part 5 can be reconnected. By rotating the rotating part, the second valve stem 2 can be driven to move the valve plate.

[0025] Of course, by enabling the automatic drive device 1 to have a non-locking capability, the automatic drive device 1 will not hinder the process of the second valve stem 2 driving the valve plate to move. As mentioned above, the automatic drive device 1 can be a hydraulic drive device. In this process, the second valve stem 2 can drive the piston in the hydraulic drive device to move relative to the cylinder, so that the hydraulic drive device will not hinder the normal operation of the manual drive.

[0026] As described above, the second valve stem 2 and the moving part 5 can be detachably fixedly connected by means of threaded sleeve or the like. In another embodiment of this application, the second valve stem 2 can also be provided with a first through hole, and by making one end of the moving part 5 sleeved outside the second valve stem 2, and by providing a second through hole on the moving part 5, the purpose of connecting the moving part 5 and the second valve stem 2 by using the connecting rod 4 can be achieved.

[0027] That is, in this embodiment, the valve includes a connecting rod 4, and the end of the moving member 5 near the second valve stem 2 may be provided with a receiving cavity, into which a part of the second valve stem 2 may extend, which facilitates the connection between the second valve stem 2 and the moving member 5; and by setting the first through hole on the part of the second valve stem 2 that is received in the receiving cavity of the moving member 5, and setting the second through hole on the cavity wall of the receiving cavity in the moving member 5, the second through hole can be aligned with the first through hole after the part of the second valve stem 2 extends into the receiving cavity. Thus, by passing the connecting rod 4 through the first through hole and the second through hole, the purpose of detachably fixing the second valve stem 2 and the moving member 5 can be achieved.

[0028] More specifically, the connecting rod 4 may include a bolt, and by making both the first and second through holes threaded holes, a relatively stable connection can be formed between the connecting rod 4, the second valve stem 2, and the moving part 5 during the installation of the connecting rod 4. To reduce the difficulty of disassembling and assembling the connecting rod 4, in another embodiment of this application, both the first and second through holes are smooth holes, and the outer wall of the connecting rod 4 is no longer threaded. In this case, to ensure that the connecting rod 4 can still form a relatively stable fit with the second valve stem 2 and the moving part 5, one end of the connecting rod 4 can be provided with an end cap, and the other end of the connecting rod 4 can be provided with a pin hole. By installing a pin in the pin hole, the connecting rod 4 can be prevented from uncontrollably coming out of the first and second through holes. Of course, during the formation of the connecting rod 4, the size of the end cap needs to be larger than the size of the second through hole to ensure that the end face does not extend into the second through hole, thereby ensuring that the connecting rod 4 can form a limiting fit with the opposite sides of the moving part 5 through the end cap and the pin respectively.

[0029] As described above, the linear transmission assembly includes a rotating member and a moving member 5. That is, during the transmission process provided by the linear transmission assembly, the rotating member and the moving member 5 will rotate relative to each other, and they will also move relative to each other. Therefore, in a specific embodiment of this application, the linear transmission assembly may include a gear and rack structure. In this case, the rotating member may be a gear and the moving member 5 may be a rack; or, the linear transmission assembly may include a worm gear mechanism, in which case the rotating member is a worm and the moving member 5 is a worm.

[0030] To reduce the assembly difficulty of the linear transmission assembly, in one specific embodiment of this application, the linear transmission assembly includes a lead screw and nut mechanism, wherein the moving part 5 is a lead screw and the rotating part is a nut. More specifically, to reduce costs, the moving part 5 can be a trapezoidal lead screw. In this case, the linear transmission assembly can have self-locking capability by designing the surface parameters of the trapezoidal lead screw. When the valve opening and closing needs to be controlled manually, the second valve stem 2 and the moving part 5 are kept in a fixed connection, and the rotating part is driven to rotate relative to the valve body by manually tightening the nut. Thus, under the transmission action, the moving part 5 can move relative to the rotating part, and the second valve stem 2 drives the valve plate to move relative to the valve body, thereby completing the purpose of opening and sealing the valve cavity.

[0031] Accordingly, by having both ends of the lead screw extend beyond the nut, when the valve plate needs to be driven by the automatic drive device 1, the second valve stem 2 and the moving part 5 can be separated first. Then, by screwing the end of the moving part 5 away from the second valve stem 2, the moving part 5 can move together with the rotating part while rotating, thereby gradually moving the moving part 5 away from the second valve stem 2, thus providing clearance space for the automatic drive device 1 to drive the valve plate.

[0032] Of course, to reduce the difficulty of driving the rotating component, in one specific embodiment of this application, a rotating handwheel 8 can be fixedly provided on the outside of the nut, thereby reducing the driving torque of the rotating component and thus reducing the difficulty of driving the rotating component. The driving handwheel and the nut can be connected by welding or other means, or they can be fixed relatively in the rotation direction of the rotating component by key connection or other means. Of course, in this case, a retaining ring or other device can be provided between the nut and the rotating handwheel 8 to ensure relatively high assembly reliability between the two.

[0033] Optionally, the nut includes a threaded sleeve and an end cap, wherein the end cap is disposed at one end of the threaded sleeve, and a lead screw can be installed in the inner cavity of the threaded sleeve, forming a threaded connection between the lead screw and the inner wall of the threaded sleeve, so that the lead screw can be driven to make linear motion when the nut rotates. With the above structure, the nut and the valve body can form a sealing fit, thereby improving the overall performance of the valve body.

[0034] Of course, in order to enable the moving part 5 to still have the ability to avoid the second valve stem 2 when the above technical solution is adopted, the end cover can be provided with an avoidance hole and the avoidance hole can be connected to the inner cavity of the threaded sleeve. At the same time, by providing a locking rod 9 at one end of the screw near the end cover and making at least a part of the locking rod 9 extend out of the inner cavity of the threaded sleeve through the avoidance hole, the locking rod 9 can also have the ability to drive the moving part 5 to rotate relative to the rotating part.

[0035] In detail, the locking rod 9 and the moving part 5 can be fixedly connected by welding or other means. When it is necessary to use the automatic drive device 1 to drive the valve plate to work, the second valve rod 2 and the moving part 5 can be separated first. Then, by turning the locking rod 9, the moving part 5 can be driven to rotate relative to the rotating part. During this process, the moving part 5 can move away from the second valve rod 2, thereby allowing the moving part 5 to avoid the second valve rod 2 and prevent the moving part 5 from hindering the valve plate from performing normal opening and closing work.

[0036] Of course, in the above embodiments, it is also necessary to design the dimensions of the threaded sleeve in the extension direction of the moving part 5 (i.e. the movement direction of the valve plate). Specifically, it is necessary to ensure that when the moving part 5 moves to the end of the threaded sleeve away from the valve plate, the moving part 5 will not hinder the normal movement of the valve plate (and the second valve stem 2) to complete the opening and closing operation.

[0037] In addition, in the above embodiments, to ensure a reliable sealing fit between the threaded sleeve and the valve body, the locking rod 9 is sealed to the clearance hole. Specifically, a sealing ring or similar device can be provided between the locking rod 9 and the clearance hole to ensure a sealing fit between the locking rod 9 and the inner wall of the clearance hole. Alternatively, a retaining ring or similar device can be provided between the locking rod 9 and the clearance hole to improve the reliability of the fit between the locking rod 9 and the threaded sleeve.

[0038] Specifically, regarding the connection between the threaded sleeve and the valve body, the valve may also include a support sleeve 3 and a pressure cap 7. The support sleeve 3 is fixedly installed in the valve body. Of course, the support sleeve 3 is located on the side of the valve body where the second valve stem 2 is located. The inner cavity of the support sleeve 3 can communicate with the T-slot in the valve body used to install the second valve stem 2, so that the second valve stem 2 can be accommodated in the support sleeve 3.

[0039] Meanwhile, the pressure cap 7 is fitted and fixed to the outside of the support cylinder 3. Of course, the pressure cap 7 is located at the end of the support cylinder 3 away from the valve body, and the pressure cap 7 and the support cylinder 3 can be connected to each other by bolts or other connecting parts. Furthermore, by setting a part of the threaded sleeve inside the support cylinder 3, and by clamping the threaded sleeve between the pressure cap 7 and the support cylinder 3 in the direction of valve plate movement, the threaded sleeve can form a relatively stable relative fixed relationship with the support cylinder 3, the pressure cap 7, and the valve body in the direction of valve plate movement.

[0040] Specifically, the threaded sleeve can be provided with an annular flange or similar structure at its end or middle. By clamping the annular flange between the end of the support cylinder 3 and the end of the pressure cap 7 away from the support cylinder 3, the purpose of fixing the support cylinder 3, the pressure cap 7, and the threaded sleeve in the direction of valve plate movement can be achieved. Of course, in order to ensure that the threaded sleeve can still rotate relatively smoothly relative to the support cylinder 3 and the pressure cap 7, in the embodiment of the application, the threaded sleeve also cooperates with the pressure cap 7 through a bearing 6. The bearing 6 can specifically be a thrust cylindrical roller bearing 6, which can withstand relatively large loads. At the same time, the thrust cylindrical roller bearing 6 also has relatively strong vibration resistance.

[0041] In addition, in this embodiment of the application, the pressure cap 7 and the support cylinder 3 are sealed together, as are the pressure cap 7 and the threaded sleeve. Specifically, sealing rings can be provided between the pressure cap 7 and the threaded sleeve, as well as between the pressure cap 7 and the support cylinder 3, to ensure that the pressure cap 7 and the threaded sleeve, as well as between the pressure cap 7 and the support cylinder 3, can form a sealed fit relationship.

[0042] Furthermore, to further reduce the mutual friction between the threaded sleeve and the pressure cap 7, a guide strip can be provided between the threaded sleeve and the pressure cap 7 in this embodiment. The guide strip can be formed of a material with low friction, corrosion resistance, and relatively high thermal stability, such as fluorocarbon resin, phenolic resin-reinforced fabric, or cypress. This can minimize the contact area between the threaded sleeve and the pressure cap 7, thereby significantly reducing the friction between them and reducing the difficulty of rotating the threaded sleeve. More specifically, a limiting groove can be provided on the inner wall of the pressure cap 7 facing the threaded sleeve, and a portion of the guide strip can be embedded in the limiting groove to provide a limiting effect for the guide strip, preventing misalignment or displacement of the guide strip during the rotation of the threaded sleeve relative to the pressure cap 7.

[0043] As described above, the pressure cap 7 and the threaded sleeve need to have the ability to rotate relative to each other, and a bearing 6 or other device can be installed between the pressure cap 7 and the threaded sleeve. Furthermore, in order to further improve the smoothness of the rotation of the threaded sleeve, a lubrication hole can be provided on the pressure cap 7, and a grease injection valve can be provided in the lubrication hole. In this case, grease can be injected into the inside of the pressure cap 7 through the lubrication hole by periodically using the grease injection valve to reduce the friction between the pressure cap 7 and the threaded sleeve, and improve the lubrication of the bearing 6, thereby improving the working performance of the bearing 6 and further reducing the difficulty of rotating the threaded sleeve.

[0044] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element. Furthermore, it should be noted that the scope of the methods and apparatuses in the embodiments of this application is not limited to performing functions in the order shown or discussed, but may also include performing functions substantially simultaneously or in the reverse order, depending on the functions involved. For example, the described methods may be performed in a different order than described, and various steps may be added, omitted, or combined. Additionally, features described with reference to certain examples may be combined in other examples.

[0045] The embodiments of this application have been described above with reference to the accompanying drawings. However, this application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of this application without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of this application.

Claims

1. A valve, characterized in that, It includes a valve body, a valve plate, a first valve stem, a second valve stem, and a linear drive assembly, wherein, The valve body has a valve cavity, the valve plate is movably installed in the valve cavity, the first valve stem is fixedly connected to the first end of the valve plate, the second valve stem is fixedly connected to the second end of the valve plate, and an automatic drive device may be provided at the end of the first valve stem away from the valve plate. The linear transmission assembly includes a moving part and a rotating part, the rotating part being drivenly connected to the moving part, and the end of the second valve stem away from the valve plate being detachably fixedly connected to one end of the moving part.

2. The valve according to claim 1, characterized in that, The second valve stem has a first through hole, one end of the movable member is sleeved on the second valve stem, and the movable member has a second through hole. The valve includes a connecting rod, which passes through the first through hole and the second through hole to detachably and fix the second valve stem and the movable member.

3. The valve according to claim 2, characterized in that, One end of the connecting rod is provided with an end cap, and the other end of the connecting rod is provided with a pin hole, and a pin is installed in the pin hole.

4. The valve according to claim 1, characterized in that, The moving component includes a lead screw, and the rotating component includes a nut.

5. The valve according to claim 4, characterized in that, The nut includes a threaded sleeve and an end cap. The end cap is provided at one end of the threaded sleeve and has a clearance hole that communicates with the inner cavity of the threaded sleeve. The lead screw is installed in the inner cavity of the threaded sleeve, and a locking rod is provided at one end of the lead screw near the end cap. At least a portion of the locking rod extends out of the inner cavity of the threaded sleeve through the clearance hole, and the locking rod is sealed to the clearance hole.

6. The valve according to claim 4, characterized in that, The valve includes a support cylinder and a pressure cap. The support cylinder is fixedly installed on the valve body, and the pressure cap is sleeved and fixed on the outside of the support cylinder. The nut includes a threaded sleeve, a portion of which is disposed on the inside of the support cylinder. In the direction of movement of the valve plate, the threaded sleeve is sandwiched between the pressure cap and the support cylinder. The pressure cap and the support cylinder, as well as the pressure cap and the threaded sleeve, are all sealed together.

7. The valve according to claim 6, characterized in that, A bearing is provided between the threaded sleeve and the pressure cap.

8. The valve according to claim 6, characterized in that, The pressure cap is provided with a lubrication hole, and a grease injection valve is provided inside the lubrication hole.

9. The valve according to claim 6, characterized in that, A guide band is provided between the pressure cap and the threaded sleeve, and the guide band is made of a low-friction material.

10. The valve according to claim 4, characterized in that, A rotating handwheel is fixedly installed on the outside of the nut.

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