Valve

Abstract

The invention provides a valve. The valve comprises a valve body, a valve plate, a valve rod and a balance rod. The valve body comprises a valve cavity, a liquid inlet and a liquid outlet, and the valve plate is arranged in the valve cavity and used for connecting and disconnecting the liquid inlet and the liquid outlet. The valve rod is arranged on one side of the valve plate in the moving direction of the valve plate and extends out of the valve cavity from the interior of the valve cavity. The balance rod is arranged on the other side of the valve plate in the moving direction of the valve plate and extends out of the valve cavity from the interior of the valve cavity. In the moving process of the valve rod and the balance rod, the volume of one of the valve rod and the balance rod moving into the valve cavity is equal to the volume of the other one moving out of the valve cavity. The constant volume of the valve cavity in the whole process is achieved through equal-volume compensation between the valve rod and the balance rod, the opening and closing actions of the valve cannot extrude or suck fluid media in the valve cavity, and therefore pressure fluctuation and solid particle deposition blockage are avoided. Meanwhile, the volume is constant, extra hydraulic pressure generated by volume change is eliminated, operation power consumption is remarkably reduced, and driving response sensitivity is improved.

Description

Technical Field

[0001] This invention belongs to the field of control valve technology, and specifically relates to a valve. Background Technology

[0002] In land mining conveying systems, knife gate valves are typically used as the on / off control components for conveying pipelines. Due to the low pressure in land mining operations, knife gate valves are widely used because of their simple structure and large flow capacity.

[0003] However, the internal volume of a gate valve often changes during stem movement. When the stem moves inward, the volume decreases, creating a squeezing effect on the medium inside; when the stem moves outward, the volume increases, creating a suction effect. When conveying liquid media containing a large number of solid particles (such as high-concentration slurry), the squeezing effect exacerbates the erosion and wear of the valve's sealing area by these particles. Furthermore, these solid particles are often incompressible, resulting in significant resistance when moving the stem. The suction effect, on the other hand, easily creates a negative pressure zone inside the valve body, causing solid particles to precipitate from the fluid and deposit in dead zones within the valve cavity. Over long-term operation, this can lead to increased valve opening and closing resistance or even complete jamming.

[0004] In addition, the valve plate of the knife gate valve is directly exposed to the external environment. When the knife gate valve is used in the deep sea environment, marine organisms and suspended impurities that grow in the seawater can easily invade the mating gap between the valve plate and the valve body, causing damage or jamming of the sealing surface, which seriously affects the service life and sealing reliability of the valve. Therefore, the application scenarios of the existing knife gate valve are relatively limited.

[0005] The information disclosed in this background section is intended only to enhance the understanding of the overall background of the invention and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art. Summary of the Invention

[0006] The purpose of this invention is to provide a valve that solves the problem of high resistance during the opening and closing of existing deep-water valves.

[0007] To achieve the above objectives, a specific embodiment of the present invention provides a valve, which includes a valve body, a valve plate, a valve stem, and a balance rod. The valve body includes a valve cavity, an inlet, and an outlet. The valve plate is movably disposed within the valve cavity and is used to open and close the inlet and outlet. The valve stem is disposed on one side of the valve plate along the direction of movement of the valve plate, extending from inside the valve cavity to outside the valve cavity. The balance rod is disposed on the other side of the valve plate along the direction of movement of the valve plate, extending from inside the valve cavity to outside the valve cavity. The valve plate, valve stem, and balance rod are linked together, and during the movement of the valve stem and balance rod, the volume of one of the valve stem and balance rod moving into the valve cavity is equal to the volume of the other moving out of the valve cavity.

[0008] In one or more embodiments of the present invention, the valve stem includes a first main body section that extends through the valve body, and the balance bar includes a second main body section that extends through the valve body, wherein the cross-sectional area of ​​the first main body section is equal to the cross-sectional area of ​​the second main body section.

[0009] In one or more embodiments of the present invention, the valve further includes a hydraulic cylinder and an indicator rod, wherein a piston in the hydraulic cylinder is connected to a valve stem and the indicator rod, and one end of the indicator rod away from the valve stem extends out of the hydraulic cylinder. The indicator rod includes a third main body section that passes through the hydraulic cylinder, and the cross-sectional area of ​​the third main body section is equal to the cross-sectional area of ​​the second main body section.

[0010] In one or more embodiments of the present invention, the valve stem is threadedly connected to the piston, and the balance bar is threadedly connected to the piston.

[0011] In one or more embodiments of the present invention, the valve further includes a conduction position sensor and a blocking position sensor configured to cooperate with an indicator rod.

[0012] In one or more embodiments of the present invention, the valve further includes a first protective sleeve disposed outside the valve cavity and surrounding the indicator rod.

[0013] In one or more embodiments of the present invention, the valve further includes a second protective sleeve disposed outside the valve cavity and surrounding the balance bar.

[0014] In one or more embodiments of the present invention, a through-hole is provided on the valve plate, and when the valve plate moves to the conduction position, the valve hole is connected to the liquid inlet and the liquid outlet.

[0015] In one or more embodiments of the present invention, the valve hole is disposed on one side of the valve plate adjacent to the valve plate in the direction of movement of the valve plate.

[0016] In one or more embodiments of the present invention, the valve further includes a valve seat fixed in the valve cavity, a valve plate passing through the valve seat and slidably connected to the valve seat, the valve seat including an inlet channel communicating with the inlet and an outlet channel communicating with the outlet, and when the valve plate moves to the conducting position, the valve hole communicates with the inlet channel and the outlet channel.

[0017] Compared with existing technologies, this invention achieves a constant valve cavity volume throughout the entire process through equal volume compensation between the valve stem and the balance bar. This prevents the valve's opening and closing actions from compressing or sucking the fluid medium within the valve cavity, thereby avoiding pressure fluctuations and solid particle deposition and blockage. Simultaneously, the constant volume eliminates the additional hydraulic pressure caused by volume changes, significantly reducing operating power consumption and improving drive response sensitivity.

[0018] Furthermore, the valve plate of the present invention is completely contained inside the valve cavity and is not exposed to the external environment, which can effectively prevent external air oxidation, marine organism attachment, suspended impurities corrosion and external mechanical collisions, significantly improving the sealing reliability and service life of the valve plate, enabling the valve to be applied in underwater environments (such as marine environments), and enriching the application scenarios of the valve. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a cross-sectional view of a valve in one embodiment of the present invention;

[0021] Figure 2 This is a cross-sectional structural diagram of the valve plate, valve stem, balance bar, and indicator rod in one embodiment of the present invention;

[0022] Figure 3 This is a three-dimensional structural diagram of a valve in one embodiment of the present invention;

[0023] Figure 4 This is a cross-sectional view of the valve stem, indicator rod, and piston in one embodiment of the present invention.

[0024] Key reference numerals in the attached drawings: 1. Valve body; 101. Main body; 102. First end cap; 103. Second end cap; 104. Valve chamber; 105. Liquid inlet; 106. Liquid outlet; 2. Valve plate; 201. Valve hole; 3. Valve stem; 301. First main body section; 4. Balance bar; 401. Second main body section; 5. Hydraulic cylinder; 501. Piston; 6. Indicator rod; 601. Third main body section; 7. On position sensor; 8. Off position sensor; 9. First protective sleeve; 10. Second protective sleeve; 11. Valve seat; 1101. Liquid inlet channel; 1102. Liquid outlet channel; 12. First locking ring; 13. First pressure ring; 14. Second locking ring; 15. Second pressure ring. Detailed Implementation

[0025] To enable those skilled in the art to better understand the technical solutions in this disclosure, the technical solutions in the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this disclosure, and not all embodiments. Based on the embodiments in this disclosure, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of this disclosure.

[0026] In the description of this invention, it should be understood that the terms "top", "bottom", "upper", "lower", "front", "rear", "left", "right", 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 invention 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 invention.

[0027] Furthermore, the term "first" is used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, features defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0028] In one embodiment, reference is made to Figures 1 to 3As shown, the present invention provides a valve comprising a valve body 1, a valve plate 2, a valve stem 3, and a balance rod 4. The valve body 1 includes a main body 101, a first end cap 102, and a second end cap 103. The first end cap 102 and the second end cap 103 are respectively fixed to the two ends of the main body 101 in a corresponding manner. The main body 101, the first end cap 102, and the second end cap 103 together form a valve cavity 104. The main body 101 has an inlet 105 and an outlet 106, both of which are interconnected with the valve cavity 104 and are coaxially arranged. The inlet 105 and the outlet 106 are respectively used to connect to corresponding underwater pipelines. The valve plate 2 is movably disposed within the valve cavity 104, without completely blocking the space of the valve cavity 104 on both sides in the thickness direction or on both sides in the length direction. The valve plate 2 has a conducting working position and a blocking working position. When the valve plate 2 moves to the conducting working position, it can open the liquid inlet 105 and the liquid outlet 106, allowing the underwater pipeline to transport liquid media normally. When the valve plate 2 moves to the blocking working position, it can block the liquid inlet 105 and the liquid outlet 106, interrupting the liquid media transport in the underwater pipeline. The valve stem 3 and the balance rod 4 are respectively disposed on both sides of the valve plate 2 along the moving direction of the valve plate 2. The valve stem 3 passes through the first end cover 102 of the valve body 1 and extends from the inside of the valve cavity 104 to the outside of the valve cavity 104. The balance rod 4 passes through the second end cover 103 of the valve body 1 and also extends from the inside of the valve cavity 104 to the outside of the valve cavity 104. The valve plate 2, valve stem 3, and balance bar 4 are linked together. The valve stem 3 can drive the valve plate 2 and balance bar 4 to move synchronously under the drive of an external actuator. When the valve plate 2 moves between the conducting position and the blocking position, the valve stem 3 and balance bar 4 move axially synchronously. The volume of one of the valve stem 3 and balance bar 4 moving from outside the valve cavity 104 into the valve cavity 104 is equal to the volume of the other moving from inside the valve cavity 104 out of the valve cavity 104.

[0029] Based on the above structural design, when the valve plate 2 moves between the conducting and blocking positions, the valve stem 3 and the balance rod 4 move synchronously with it. Taking the movement of the valve stem 3 towards the inside of the valve cavity 104 as an example, a portion of the valve stem 3 originally located outside the valve cavity 104 gradually moves into the valve cavity 104. Simultaneously, the balance rod 4 moves towards the outside of the valve cavity 104, and a portion of its original location inside the valve cavity 104 gradually moves out of the valve cavity 104. During this process, the volume of the valve stem 3 moving into the valve cavity 104 remains equal to the volume of the balance rod 4 moving out of the valve cavity 104.

[0030] Because the volume of the valve stem 3 moving in and the volume of the balance rod 4 moving out can cancel each other out in real time, the change in the internal volume of the valve cavity 104 caused by the valve stem 3 and the balance rod 4 during movement is always zero. In other words, regardless of the working position of the valve plate 2 or any moment during its movement, the volume of the valve cavity 104 remains constant. Based on the constant volume of the valve cavity 104, even if the valve cavity 104 is filled with high-density, high-viscosity fluid media such as slurry, the opening and closing action of the valve plate 2 will not produce a squeezing or suction effect on the inside of the valve cavity 104. This avoids drastic fluctuations in medium pressure caused by changes in the volume of the valve cavity 104, and also prevents the deposition and blockage of solid particles caused by local negative pressure or flow dead zones. At the same time, because the volume is constant, there is no need to overcome the additional pressure caused by changes in the volume of the valve cavity 104 when moving the valve plate 2, thereby significantly reducing the operating power consumption of the valve and improving the response sensitivity of the drive system.

[0031] Furthermore, the valve plate 2 remains within the valve cavity 104 during the opening and closing process, and does not come into direct contact with the external environment. This effectively prevents damage to the valve plate 2 caused by external environmental factors (such as oxidation of land air, accidental collisions with other components, attachment of marine organisms, and seawater erosion), reduces the risk of deformation or jamming of the valve plate 2, and extends the service life of the valve plate 2.

[0032] In one embodiment, reference is made to Figure 2 As shown, the valve stem 3 includes a first main body section 301, which passes through the first end cap 102 of the valve body 1, and the first main body section 301 can slide in a sealing manner relative to the first end cap 102. The balance rod 4 includes a second main body section 401, which passes through the second end cap 103 of the valve body 1, and the second main body section 401 can slide in a sealing manner relative to the second end cap 103. The cross-sectional area of ​​the first main body section 301 is approximately equal to the cross-sectional area of ​​the second main body section 401, and these two cross-sections are perpendicular to the axial directions of the valve stem 3 and the balance rod 4, respectively. Since the cross-sectional areas of the first main body section 301 and the second main body section 401 are equal, when they move synchronously in opposite directions, the volume of the first main body section 301 moving into the valve cavity 104 is always equal to the volume of the second main body section 401 moving out of the valve cavity 104, thereby ensuring that the volume of the valve cavity 104 remains constant.

[0033] Furthermore, both the valve stem 3 and the balance bar 4 are constructed as round rods. The first main body section 301 of the valve stem 3 has a circular cross-section, and the second main body section 401 of the balance bar 4 also has a circular cross-section, and the diameters of the two circles are approximately equal.

[0034] In one embodiment, reference is made to Figure 1 and Figure 2As shown, the valve also includes a hydraulic cylinder 5 and an indicator rod 6. The hydraulic cylinder 5 is fixed to the first end cap 102, and the interior of the hydraulic cylinder 5 has a movable piston 501, which is fixedly connected to both the valve stem 3 and the indicator rod 6. The indicator rod 6 is coaxially arranged with the valve stem 3, and the indicator rod 6 is located at the end of the valve stem 3 facing away from the valve plate 2. The end of the indicator rod 6 away from the valve stem 3 extends to the outside of the hydraulic cylinder 5, so that its extended position can visually reflect the real-time working position of the valve plate 2, facilitating external monitoring by the operator. The indicator rod 6 includes a third main body section 601 that passes through the end of the hydraulic cylinder 5. The cross-sectional area of ​​the third main body section 601 is configured to be equal to the cross-sectional area of ​​the second main body section 401 of the balance bar 4, and this cross-section is perpendicular to the axial direction of the indicator rod 6.

[0035] The third main body section 601 of the indicator rod 6 passes through the end of the hydraulic cylinder 5, with one end exposed outside the hydraulic cylinder 5 and directly bearing the seawater pressure. When the cross-sectional area of ​​the third main body section 601 is equal to that of the second main body section 401, the axial thrust of the seawater acting on the indicator rod 6 is equal in magnitude and opposite in direction to the axial thrust acting on the balance bar 4. Since the indicator rod 6 and the balance bar 4 form a rigid drive chain through the valve plate 2, valve stem 3, and piston 501, the thrust exerted by the seawater on the balance bar 4 and the indicator rod 6 can cancel each other out within the drive chain, thus ensuring that the entire drive chain remains in force balance under the high pressure environment of the deep sea. This balance ensures that changes in seawater pressure will not be converted into axial thrust that drives the valve plate 2 to move, thereby avoiding interference from external water pressure fluctuations on the position of the valve plate 2 and improving the stability of the valve plate 2 position control.

[0036] Furthermore, the indicator rod 6 is constructed as a round rod, the cross-section of the third main body section 601 of the indicator rod 6 is circular, and the diameter of the third main body section 601 is approximately equal to the diameter of the second main body section 401 of the balance bar 4.

[0037] In one embodiment, reference is made to Figure 4 As shown, the valve stem 3 is threadedly connected to the piston 501. At the connection between the valve stem 3 and the piston 501, a first locking ring 12 and a first pressure ring 13 are fitted onto the valve stem 3. The first locking ring 12 is installed in an annular groove on the outer circumference of the valve stem 3 and also in an annular groove on the end face of the piston 501. The first pressure ring 13 is threadedly connected to the valve stem 3 and is located on the side of the first locking ring 12 facing away from the piston 501, pressing against the end faces of the first locking ring 12 and the piston 501. When there is a tendency for the threads between the valve stem 3 and the piston 501 to loosen, the first locking ring 12 is restricted from axial displacement by the first pressure ring 13, thus preventing further loosening of the threads.

[0038] Similarly, refer to Figure 4As shown, the balance bar 4 is connected to the piston 501 in the same way as above. The balance bar 4 and the piston 501 are threaded together. At the connection between the balance bar 4 and the piston 501, a second locking ring 14 and a second pressure ring 15 are fitted on the balance bar 4. The second locking ring 14 is installed in the annular groove on the outer circumference of the balance bar 4 and is also located in the annular groove at the end face of the piston 501. The second pressure ring 15 is threaded together with the balance bar 4. The second pressure ring 15 is located on the side of the second locking ring 14 facing away from the piston 501 and presses against the end faces of the second locking ring 14 and the piston 501.

[0039] In one embodiment, reference is made to Figure 1 and Figure 3 As shown, the valve also includes a conduction position sensor 7, a blocking position sensor 8, and a first protective sleeve 9. The first protective sleeve 9 is installed at the end of the hydraulic cylinder 5 facing away from the valve body 1. The first protective sleeve 9 is hollowed out, and the indicator rod 6 extends into the first protective sleeve 9. The conduction position sensor 7 and the blocking position sensor 8 are installed on the outer circumferential surface of the first protective sleeve 9 and are spaced apart along the axial direction of the first protective sleeve 9 to cooperate with the indicator rod 6.

[0040] The on / off position sensor 7 and the off / off position sensor 8 are preferably proximity sensors, such as photoelectric, inductive, magnetic induction, or Hall effect sensors. The indicator rod 6 is equipped with a sensing element that matches the sensor, such as a permanent magnet or a metal sensing block. When the valve plate 2 moves to the on / off working position, the indicator rod 6 moves accordingly to the corresponding position within the first protective sleeve 9. At this time, the sensing element on the indicator rod 6 is directly opposite the on / off position sensor 7, triggering the on / off position sensor 7 to generate a first detection signal, indicating that the valve is fully open and the inlet 105 and outlet 106 are in a conductive state. When the valve plate 2 moves to the off / off working position, the indicator rod 6 moves to another position within the first protective sleeve 9, and the sensing element on the indicator rod 6 is directly opposite the off / off position sensor 8, triggering the off / off position sensor 8 to generate a second detection signal, indicating that the valve is fully closed and the inlet 105 and outlet 106 are in a blocked state. Of course, when the on / off position sensor 7 and the off / off position sensor 8 are photoelectric sensors, the indicator rod 6 usually does not need to be equipped with a sensing element; position detection is achieved solely by the indicator rod 6 itself blocking light.

[0041] With the above configuration, the on / off position sensor 7 and the off / open position sensor 8 can detect the actual working position of the valve plate 2 in real time and transmit the detection signal to the surface control platform or automatic control system. Operators can accurately grasp the valve's on / off status without the need for underwater observation equipment, facilitating remote monitoring and operation.

[0042] Furthermore, the first protective sleeve 9 also protects the indicator rod 6, forming a physical barrier in the complex seabed environment. This effectively prevents external objects from directly impacting the indicator rod 6, avoiding bending or damage caused by accidental collisions, ocean currents, or contact with underwater equipment. In addition, the first protective sleeve 9 prevents suspended impurities, sediments, or marine organisms in the seawater from directly adhering to the surface of the indicator rod 6, reducing movement stagnation or detection interference caused by debris accumulation. Through these protective functions, the first protective sleeve 9 ensures that the indicator rod 6 maintains good movement and detection accuracy during long-term underwater operation, improving the reliability and service life of the entire position monitoring system.

[0043] Furthermore, an observation window is provided on the periphery of the first protective sleeve 9. The observation window can expose part of the indicator rod 6. The observation window allows operators to directly observe the actual position of the indicator rod 6 during on-site debugging or maintenance without disassembling the first protective sleeve 9, thus improving the convenience of maintenance operations.

[0044] In one embodiment, reference is made to Figure 1 and Figure 3 As shown, the valve also includes a second protective sleeve 10, which is located outside the valve cavity 104 and fixed to the second end cap 103. The second protective sleeve 10 is perforated, and the balance bar 4 extends into the second protective sleeve 10. The second protective sleeve 10 can protect the balance bar 4, effectively preventing external objects from directly impacting the balance bar 4 and avoiding bending or damage to the balance bar 4 due to accidental collisions, ocean current impacts, or contact with underwater operating equipment. In addition, the second protective sleeve 10 can also prevent suspended impurities, sediments, or marine organisms in seawater from directly adhering to the surface of the balance bar 4, reducing movement stagnation or detection interference caused by debris accumulation.

[0045] In one embodiment, reference is made to Figure 1 and Figure 2 As shown, valve plate 2 has a valve hole 201 extending through its thickness. When valve plate 2 moves to the conductive position, valve hole 201 communicates with inlet 105 and outlet 106. The valve hole 201 optimizes the structure of valve plate 2. If valve plate 2 did not have valve hole 201, in order to achieve communication between inlet 105 and outlet 106, valve plate 2 would need to be moved entirely to a position completely offset from inlet 105 and outlet 106. In this state, part of valve stem 3 or balance bar 4 will move into the flow channel area between inlet 105 and outlet 106, occupying part of the flow space. This not only increases the resistance to fluid flow but also easily induces turbulence and eddies, leading to increased pressure loss of the medium. For deep-water mining conditions involving the transport of high-density, high-viscosity slurries, this additional resistance may significantly reduce transport efficiency and exacerbate the erosion and wear of solid particles on the internal components of valve cavity 104.

[0046] Therefore, by directly opening the valve hole 201 on the valve plate 2, the valve plate 2 only needs to be moved to the position where the valve hole 201 is aligned with the liquid inlet 105 and the liquid outlet 106 when in the conducting state. There is no need to move the valve rod 3 or the balance rod 4 into the flow channel area between the liquid inlet 105 and the liquid outlet 106, and it will not interfere with the flow path of the fluid medium.

[0047] Furthermore, referring to Figure 1 and Figure 2 As shown, in the moving direction of the valve plate 2, the valve hole 201 is located adjacent to one side of the valve plate 2, meaning that the geometric center of the valve hole 201 does not coincide with the geometric center of the valve plate 2, but is located adjacent to the edge of one side of the valve plate 2. If the valve hole 201 is located in the central area of ​​the valve plate 2, the overall length of the valve plate 2 needs to be increased accordingly to ensure that the inlet 105 and outlet 106 can be completely closed when the valve plate 2 moves to the blocking position. However, by setting the valve hole 201 adjacent to one side of the valve plate 2, the length of the valve plate 2 can be controlled within a reasonable range while satisfying the conduction and blocking functions. This is beneficial for reducing the size of the valve body 1 and the valve plate 2, making the valve structure more compact.

[0048] Preferably, refer to Figure 1 and Figure 2 As shown, valve hole 201 is relatively closer to the side of valve plate 2 adjacent to valve stem 3.

[0049] Furthermore, referring to Figure 1 As shown, the valve also includes a valve seat 11 fixed within the valve cavity 104. The valve plate 2 passes through the valve seat 11 and is slidably connected to it. The valve seat 11 guides the movement of the valve plate 2, ensuring that the valve plate 2 maintains a stable trajectory during opening and closing. The valve seat 11 includes an inlet channel 1101 communicating with the inlet port 105 and an outlet channel 1102 communicating with the outlet port 106. The inlet channel 1101 and the outlet channel 1102 are coaxially arranged, forming a flow channel structure that passes through the valve seat 11. When the valve plate 2 moves to the open position, the valve hole 201 on the valve plate 2 communicates with the inlet channel 1101 and the outlet channel 1102. The fluid medium enters the inlet channel 1101 through the inlet port 105, passes through the valve hole 201 into the outlet channel 1102, and finally flows out from the outlet port 106, thus achieving pipeline connectivity. When the valve plate 2 moves to the blocking position, the solid part of the valve plate 2 blocks the liquid inlet channel 1101 and the liquid outlet channel 1102, cutting off the flow of the medium. The valve seat 11 separates the sliding mating surface of the valve plate 2 from the valve body 1, which facilitates the use of wear-resistant materials to manufacture the valve seat 11 to improve its service life, and at the same time simplifies the processing technology of the valve body 1.

[0050] In one embodiment, a sealing ring, a dustproof ring, and a guide strip are provided at the connection between the valve stem 3 and the first end cover 102. The sealing ring, dustproof ring, and guide strip are fitted onto the valve stem 3 and embedded in the corresponding hole wall of the first end cover 102. The sealing ring is used to seal the opening on the first end cover 102 (i.e., the hole on the first end cover 102 through which the valve stem 3 passes), the dustproof ring is used to scrape off impurities attached to the surface of the valve stem 3 to prevent external contaminants from entering the valve cavity 104, and the guide strip is used to support the valve stem 3 and guide its axial movement, reducing the friction between the valve stem 3 and the first end cover 102.

[0051] Furthermore, the connection between the balance bar 4 and the second end cap 103 is also provided with a sealing ring, a dustproof ring, and a guide strip. The three are fitted onto the balance bar 4 and embedded in the corresponding hole wall of the second end cap 103 to prevent media leakage, block contaminants from entering, and guide the balance bar 4 to move smoothly.

[0052] Furthermore, a sealing ring, a dustproof ring, and a guide strip are also provided at the connection between the indicator rod 6 and the hydraulic cylinder 5. These are fitted onto the indicator rod 6 and embedded in the corresponding hole wall at the end of the hydraulic cylinder 5 to ensure that the indicator rod 6 moves smoothly and is reliably sealed.

[0053] Furthermore, a sealing ring and a guide belt are fitted on the outer circumferential surface of the piston 501. The sealing ring is used to isolate the working chambers on both sides of the hydraulic cylinder 5 to prevent hydraulic oil leakage. The guide belt is used to support the piston 501 and guide it to reciprocate within the hydraulic cylinder 5, reducing the friction between the piston 501 and the cylinder wall.

[0054] It will be apparent to those skilled in the art that this disclosure is not limited to the details of the exemplary embodiments described above, and that this disclosure can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of this disclosure is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within this disclosure. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0055] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A valve, characterized in that, The valve includes: The valve body (1) includes a valve cavity (104), an inlet (105), and an outlet (106). A valve plate (2) is movably disposed in the valve cavity (104), and the valve plate (2) is used to open and close the inlet (105) and the outlet (106). The valve stem (3) is disposed on one side of the valve plate (2) along the moving direction of the valve plate (2), and the valve stem (3) extends from inside the valve cavity (104) to outside the valve cavity (104); A balance bar (4) is provided on the other side of the valve plate (2) along the moving direction of the valve plate (2), and the balance bar (4) extends from inside the valve cavity (104) to outside the valve cavity (104); The valve plate (2), valve stem (3) and balance bar (4) are linked together. During the movement of the valve stem (3) and balance bar (4), the volume of one of the valve stem (3) and the balance bar (4) moving into the valve cavity (104) is equal to the volume of the other moving out of the valve cavity (104).

2. The valve according to claim 1, characterized in that, The valve stem (3) includes a first main body section (301) that penetrates the valve body (1), and the balance rod (4) includes a second main body section (401) that penetrates the valve body (1). The cross-sectional area of ​​the first main body section (301) is equal to the cross-sectional area of ​​the second main body section (401).

3. The valve according to claim 2, characterized in that, The valve also includes a hydraulic cylinder (5) and an indicator rod (6). The piston (501) in the hydraulic cylinder (5) is connected to the valve stem (3) and the indicator rod (6). One end of the indicator rod (6) away from the valve stem (3) extends out of the hydraulic cylinder (5). The indicator rod (6) includes a third main body section (601) that passes through the hydraulic cylinder (5). The cross-sectional area of ​​the third main body section (601) is equal to the cross-sectional area of ​​the second main body section (401).

4. The valve according to claim 3, characterized in that, The valve stem (3) is threadedly connected to the piston (501), and the balance rod (4) is threadedly connected to the piston (501).

5. The valve according to claim 3, characterized in that, The valve also includes an on position sensor (7) and an off position sensor (8) that are configured to cooperate with the indicator rod (6).

6. The valve according to claim 3, characterized in that, The valve also includes a first protective sleeve (9) disposed outside the valve chamber (104) and surrounding the indicator rod (6).

7. The valve according to claim 1, characterized in that, The valve also includes a second protective sleeve (10) disposed outside the valve chamber (104) and surrounding the balance bar (4).

8. The valve according to claim 1, characterized in that, The valve plate (2) has a through valve hole (201). When the valve plate (2) moves to the open position, the valve hole (201) is connected to the inlet (105) and the outlet (106).

9. The valve according to claim 8, characterized in that, In the direction of movement of the valve plate (2), the valve hole (201) is provided adjacent to one side of the valve plate (2).

10. The valve according to claim 8, characterized in that, The valve also includes a valve seat (11) fixed in the valve cavity (104). The valve plate (2) passes through the valve seat (11) and is slidably connected to the valve seat (11). The valve seat (11) includes an inlet channel (1101) communicating with the inlet port (105) and an outlet channel (1102) communicating with the outlet port (106). When the valve plate (2) moves to the conducting position, the valve hole (201) communicates with the inlet channel (1101) and the outlet channel (1102).

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