Balanced assisted gate valve

Abstract

This utility model discloses a balanced gate valve belonging to the field of valve technology. The balanced gate valve includes a valve body, valve cover, valve seat, valve stem, valve plate, valve stem nut, and handwheel. The valve body has a flow channel for medium flow, and the valve seat passes through the flow channel. The valve cover is connected to a balanced valve cylinder, and a balanced valve tube passes through the balanced valve cylinder. The inner wall of the balanced valve cylinder and the outer wall of the balanced valve tube form a balanced cavity. A first guide hole is opened on the side wall of the balanced valve cylinder. A second guide hole is opened on the valve seat, which is connected to the flow channel. The first and second guide holes are connected by a guide pipe. A balanced valve plug passes through the balanced valve tube and is interference-fitted with the inner wall of the balanced valve cylinder. When the gate valve is opened, the valve plate moves relative to the valve seat, and the medium flows between the valve plate and the valve seat. Simultaneously, the medium in the balanced cavity applies downward pressure to the end face of the balanced valve plug, thereby applying a downward thrust to the valve stem, balancing the upward thrust of the medium in the flow channel on the valve stem.

Description

Technical Field

[0001] This utility model relates to the field of valve technology, specifically to a balanced assist gate valve. Background Technology

[0002] With the rapid development of industrial technology, valves need to be installed on pipelines that transport various fluids. Gate valves are a very important type of valve. They have low flow resistance, compact structure, good valve rigidity, smooth flow passage, and low flow resistance. However, when used in high-pressure environments, the friction between the valve gate and the valve body is large, making it difficult to turn and open the gate valve.

[0003] Chinese utility model patent publication number "CN203594803U" discloses a balanced gate valve, including a valve body, gate, valve seat, valve stem, bracket, grease fitting, bracket locking nut, valve stem nut, handwheel, key, valve stem indicator cover, base, small shaft, and base sleeve. A small shaft is provided on the valve body and fixed to the bottom of the gate, making the small shaft, gate, and valve stem a single unit. The small shaft is subjected to a downward force from the medium, and the valve stem is subjected to an upward force from the medium. The two forces are equal in magnitude and opposite in direction, keeping the valve in a balanced state and reducing the effort required for operation.

[0004] However, the aforementioned balanced gate valve still has the following drawbacks: First, when the gate valve is not open, the small shaft, gate, and valve stem are a whole, and all the pressure inside the gate valve still acts on the gate. That is, when the handwheel is initially rotated, it still needs to overcome the hydraulic pressure of the medium to achieve rotation. The rotational friction is large, and the gate valve cannot be opened or closed smoothly.

[0005] Second, when the gate valve is opened, the medium pressure acts on the valve stem and the small shaft respectively. However, during the opening process of the gate valve, the pressure of the medium on the valve stem and the small shaft is not in a completely balanced state. That is, the force on the valve stem is relatively larger than the force on the small shaft, causing the valve stem to squeeze the valve seat. The friction does not decrease significantly, meaning that a large force is still required to turn the handwheel to drive the valve stem to rotate.

[0006] Therefore, it is necessary to improve upon the aforementioned shortcomings. Utility Model Content

[0007] The purpose of this invention is to provide a balanced gate valve with smooth handle rotation and quick valve opening and closing, in order to solve the above-mentioned problems existing in the prior art.

[0008] To achieve the above objectives, the technical solution adopted by this utility model is as follows: a balanced gate valve, comprising a valve body, a valve cover, a valve seat, a valve stem, a valve plate, a valve stem nut, and a handwheel. The valve stem nut is threadedly connected to the valve stem. The valve body has a flow channel for medium flow. The valve seat passes through the flow channel. The valve plate and the valve seat are interference-fitted. The valve stem is rotatably fitted to the valve body. One end of the valve stem is connected to the valve plate, and the other end is fixedly connected to the handwheel. The valve plate and the valve stem are linked. The valve cover is connected to a balanced valve cylinder. A balanced valve cylinder passes through the balanced valve cylinder. The inner wall of the balanced valve cylinder and the outer wall of the balanced valve cylinder form a balanced cavity. A first guide hole is opened on the side wall of the balanced valve cylinder. The valve seat is connected to the flow channel and has a second guide hole. The first guide hole and the second guide hole are connected through a guide pipe. A balanced valve plug passes through the balanced valve cylinder. The balanced valve plug is interference-fitted with the inner wall of the balanced valve cylinder.

[0009] By adopting the above technical solution: when the gate valve is open, the valve plate moves relative to the valve seat, and the medium flows between the valve plate and the valve seat. At the same time, the medium flows through the second guide hole into the guide pipe, and then into the balance chamber. The medium in the balance chamber applies downward pressure to the end face of the balance valve plug, thereby applying downward thrust to the valve stem, balancing the upward thrust of the medium in the flow pipeline on the valve stem. Since the medium does not flow when the gate valve is closed, that is, the medium in the balance chamber does not apply pressure to the balance valve plug. Only when the valve plate is open relative to the valve seat will the flowing medium squeeze the medium in the guide pipe, thereby increasing the pressure of the medium in the balance chamber, realizing the dynamic balance function, improving the pressure balance capability of the gate valve. In addition, the balance valve cylinder can isolate the valve stem and the balance chamber, preventing the medium from contacting the valve stem, effectively improving the tightness and stability of the connection between the valve stem and the valve stem nut, and extending the service life of the gate valve.

[0010] The aforementioned balanced gate valve can be further configured as follows: an annular valve cylinder mounting plate extends outward from the end of the balanced valve cylinder, an annular valve cylinder mounting plate extends outward from the end of the balanced valve tube, the valve cylinder mounting plate abuts against the valve tube mounting plate, the valve cylinder mounting plate is provided with a plurality of first mounting holes, the valve tube mounting plate is provided with a plurality of second mounting holes, and the valve cover is provided with a plurality of third mounting holes, the first mounting holes, the second mounting holes, and the third mounting holes are provided correspondingly.

[0011] By adopting the above technical solution: when the balance valve cylinder is inserted into the balance valve cylinder, the valve cylinder mounting plate will contact the valve cylinder mounting plate, and the mounting bolt will pass through the first mounting hole, the second mounting hole and the third mounting hole at the same time, so as to realize the detachable connection between the balance valve cylinder, the balance valve cylinder and the valve cover, maintain the relative position stability of the balance valve cylinder and the balance valve cylinder, and improve the stability of the balance main gate valve structure.

[0012] The aforementioned balanced gate valve can be further configured as follows: the balanced valve cylinder has an installation groove, the valve stem nut is located in the installation groove, valve stem bearings are provided on both sides of the valve stem nut in the installation groove, the valve stem bearings are rotatably engaged with the valve stem, and a bracket plug is provided at the end of the balanced valve cylinder, the end of the bracket plug abuts against the balanced valve cylinder, and the bracket plug can axially limit the balanced valve cylinder.

[0013] By adopting the above technical solution: the valve stem nut is set in the mounting groove of the balance valve cylinder, and together with the bracket plug, it can axially limit the valve stem nut and valve stem, improving the stability of the position of the valve stem nut and valve stem in the valve body, while the valve stem bearing can isolate the valve stem and the balance valve cylinder, improving the smoothness of the handwheel driving the valve stem to rotate.

[0014] The aforementioned balanced gate valve can be further configured such that: a flow box is provided below the valve plate on the valve body, the flow box has a flow cavity, the flow box has a connection port, the end of the valve plate passes through the connection port, and the connection port is connected to the flow pipeline.

[0015] By adopting the above technical solution: the drainage chamber is connected to the flow pipeline through the connection port, which can guide the medium to flow smoothly into the area below the valve plate during the valve opening process, reduce turbulence and pressure fluctuations, make the hydraulic pressure acting on the bottom of the valve plate more uniform, and further assist the balance valve plug in realizing the dynamic balance of the valve stem axial force, thereby reducing the handwheel operating torque and improving the smoothness and response speed of valve opening and closing.

[0016] The aforementioned balanced gate valve can be further configured such that: a gate cap extends outward from the side of the valve body facing the handwheel, the gate cap has a receiving cavity, the valve cover is installed at the opening of the receiving cavity, a push rod assembly is provided in the receiving cavity, the push rod assembly is fixedly connected to the valve cover, and the push rod assembly is linked with the valve stem.

[0017] By adopting the above technical solution, the upper end of the tappet assembly slides with the valve cover, and the lower end is linked with the valve stem, making the axial movement of the valve stem more stable and precise. At the same time, it effectively shares the radial load borne by the valve stem, reduces the uneven wear between the valve stem and the valve cover seal, further reduces the operating torque of the handwheel, and improves the overall stability and reliability of the valve operation.

[0018] The aforementioned balanced gate valve can be further configured as follows: the push rod assembly includes a valve plug gasket disposed on the valve stem and several push rods, one end of the push rod is fixedly connected to the valve plug gasket and the other end passes through the valve cover and enters the balance chamber, the valve cover is provided with a push rod sealing gland, the push rod and the push rod sealing gland are slidably engaged, and a balance steel ring is provided at one end of the push rod relative to the valve plug gasket.

[0019] By adopting the above technical solution: the valve plug gasket moves synchronously with the valve stem and pushes the tappet. The tappet slides in the tappet sealing box and transmits the force to the balance steel ring in the balance chamber. The balance steel ring applies the force evenly to the medium, thereby dynamically balancing the reverse pressure of the medium on the valve plate, reducing the resistance to the axial movement of the valve stem, making the handwheel operation more effortless. At the same time, the tappet sealing box ensures the sealing of the sliding part, effectively preventing medium leakage and improving the reliability of the gate valve operation.

[0020] The aforementioned balanced gate valve can be further configured such that: a valve body gasket is provided between the valve cover and the gate valve cap; the valve cover has several first connection holes; the valve body gasket has a second connection hole corresponding to the first connection holes; and the first connection holes and the second connection holes are connected by a connecting bolt to achieve a detachable connection between the valve cover and the valve body gasket.

[0021] By adopting the above technical solution, the valve body gasket is tightly pressed between the valve cover and the gate valve cap, which effectively enhances the sealing performance at the connection between the valve body and the valve cover, prevents high-pressure media from leaking from the joint surface, and makes the installation and subsequent maintenance of the valve cover more convenient. At the same time, it ensures the stability and reliability of the connection structure and improves the overall sealing performance and service life of the valve under high-pressure conditions.

[0022] The aforementioned balanced gate valve can be further configured such that: a positioning protrusion extends outward from the end face of the valve body gasket, and a positioning groove is provided on the valve cover to cooperate with the positioning protrusion; the positioning protrusion can penetrate into the positioning groove to position and install the valve body gasket and the valve cover.

[0023] By adopting the above technical solution, the positioning convex ring and positioning groove can realize the rapid pre-positioning of the valve body gasket and valve cover, effectively preventing circumferential or radial offset during the fastening process, ensuring that the connecting bolt can pass smoothly through the first connecting hole and the second connecting hole, which not only improves the assembly efficiency and accuracy, but also ensures that the valve body gasket is under uniform pressure, thereby significantly enhancing the sealing reliability of the connection end face between the valve cover and the gate valve cap, and preventing high pressure medium leakage.

[0024] The beneficial effects of this utility model are as follows: This application sets a balance valve cylinder and a balance valve tube on the valve cover. The balance valve cylinder and the balance valve tube form a balance chamber. The balance valve tube is fitted with a balance valve plug. The balance chamber is connected to the flow pipeline through a guide pipe. When the gate valve is in the closed state, the medium is in a static flow state. The medium in the balance chamber will not exert pressure on the surface of the balance valve plug. When the handwheel drives the valve stem to rotate, it causes the valve stem to move relative to the valve stem nut. When the valve plate is misaligned relative to the valve seat, the flow pipeline is connected, and the medium flows in and fills the guide groove. At this time, the medium exerts an upward pressure on the lower end of the valve plate. At the same time, the medium in the balance chamber is squeezed and exerts the same downward pressure on the balance gate valve, thereby balancing the pressure at both ends of the valve stem. Compared with the method of directly turning the handwheel to drive the valve stem to open the gate valve, the thrust of the medium in the balance chamber and the flow channel on the valve stem is equal and opposite. The friction between the valve stem thread and the valve stem nut is minimized. No matter what the diameter and pressure of the gate valve are, the valve can be opened easily and freely. The torque is the same as that of the valve when it is unloaded.

[0025] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. Attached Figure Description

[0026] Figure 1 This is a cross-sectional schematic diagram of the balance-assisted gate valve of this utility model; Figure 2 This is a schematic diagram showing the disassembly of the valve body gasket and valve cover of this utility model; Figure 3 This is an assembly diagram of the balance valve cylinder, balance valve tube, and balance valve plug of this utility model; Figure 4 This is a schematic diagram of the structure of the tappet assembly of this utility model; Labeling notes: Valve body 1, Flow pipe 11, Second guide hole 12, Guide pipe 13, Drain box 14, Drain cavity 141, Connection port 142, Gate valve cap 15, Receiving cavity 151, Valve body gasket 16, Second connecting hole 161, Positioning convex ring 162, Valve cover 2, Third mounting hole 21, First connecting hole 22, Positioning groove 23, Valve seat 3, Valve stem 4, Valve plate 41, Valve stem nut 42, Handwheel 43, Balance valve cylinder 5, Balance cavity 51, First guide hole 52, Valve cylinder mounting plate 53, First mounting hole 531, Balance valve cylinder 6, Valve cylinder mounting plate 61, Second mounting hole 611, Mounting groove 62, Valve stem bearing 63, Bracket screw plug 64, Balance valve plug 7, Taper assembly 8, Valve plug flat washer 81, Taper 82, Taper sealing box 83, Balance steel ring 84. Detailed Implementation

[0027] The technical solutions in the embodiments of this utility model will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of this utility model, and 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.

[0028] A type of balanced booster gate valve, such as Figures 1 to 4 As shown, the valve includes a valve body 1, a valve cover 2, a valve seat 3, a valve stem 4, a valve plate 41, a valve stem nut 42, and a handwheel 43. The valve stem nut 42 is threadedly connected to the valve stem 4. The valve body 1 has a flow channel 11 for media flow. The valve seat 3 passes through the flow channel 11. The valve plate 41 and the valve seat 3 are interference-fitted. The valve stem 4 is rotatably fitted to the valve body 1. One end of the valve stem 4 is connected to the valve plate 41, and the other end is fixedly connected to the handwheel 43. The valve plate 41 and the valve stem 4 are linked. The valve cover 2 is connected to the balance valve cylinder 5, and the balance valve cylinder 5 is provided with a balance valve tube 6. The inner wall of the balance valve cylinder 5 and the outer wall of the balance valve tube 6 form a balance cavity 51. The side wall of the balance valve cylinder 5 is provided with a first guide hole 52. The valve seat 3 is connected to the flow pipe 11 and is provided with a second guide hole 12. The first guide hole 52 and the second guide hole 12 are connected through a guide pipe 13. The balance valve tube 6 is provided with a balance valve plug 7, and the balance valve plug 7 is interference-fitted with the inner wall of the balance valve cylinder 5. When the gate valve is open, the valve plate 41 moves relative to the valve seat 3, and the medium flows between the valve plate 41 and the valve seat 3. At the same time, the medium flows through the second guide hole 12 into the guide pipe 13, and then into the balance chamber 51. The medium in the balance chamber 51 applies downward pressure to the end face of the balance valve plug 7, thereby applying downward thrust to the valve stem 4, balancing the upward thrust of the medium in the flow pipeline 11 on the valve stem 4. Since the medium does not flow when the gate valve is closed, the medium in the balance chamber 51 does not apply pressure to the balance valve plug 7. Only when the valve plate 41 is open relative to the valve seat 3, the flowing medium squeezes the medium in the guide pipe 13, thereby increasing the pressure of the medium in the balance chamber 51, realizing the dynamic balance function and improving the pressure balance capability of the gate valve. In addition, the balance valve cylinder 6 can isolate the valve stem 4 and the balance chamber 51, preventing the medium from contacting the valve stem 4, effectively ensuring the tightness and stability of the connection between the valve stem 4 and the valve stem nut 42, and extending the service life of the gate valve.

[0029] A flow guide box 14 is provided below the valve plate 41 in the valve body 1. The flow guide box 14 has a flow guide cavity 141 and a connection port 142. The end of the valve plate 41 passes through the connection port 142, which is connected to the flow pipeline 11. The flow guide cavity 141 is connected to the flow pipeline 11 through the connection port 142. During valve opening, it can guide the medium to flow smoothly into the area below the valve plate 41, reduce turbulence and pressure fluctuations, and make the hydraulic pressure acting on the bottom of the valve plate 41 more uniform. This further assists the balance valve plug 7 in achieving dynamic balance of the axial force of the valve stem 4, thereby reducing the operating torque of the handwheel 43 and improving the smoothness and response speed of valve opening and closing.

[0030] like Figure 1 , Figure 2 As shown, a valve body gasket 16 is provided between the valve cover 2 and the gate valve cap 15. The valve cover 2 has several first connecting holes 22, and the valve body gasket 16 has a second connecting hole 161 corresponding to the first connecting holes 22. The first connecting holes 22 and the second connecting holes 161 are connected by a connecting bolt to achieve a detachable connection between the valve cover 2 and the valve body gasket 16. The valve body gasket 16 is tightly pressed between the valve cover 2 and the gate valve cap 15, which effectively enhances the sealing performance at the connection between the valve body 1 and the valve cover 2, prevents high-pressure media from leaking from the joint surface, and makes the installation and subsequent maintenance of the valve cover 2 more convenient. At the same time, it ensures the stability and reliability of the connection structure, and improves the overall sealing performance and service life of the valve under high-pressure conditions.

[0031] A positioning protrusion 162 extends outward from the end face of the valve body gasket 16, and a positioning groove 23 is provided on the valve cover 2 to mate with the positioning protrusion 162. The positioning protrusion 162 can pass into the positioning groove 23 to position and install the valve body gasket 16 and the valve cover 2. The positioning protrusion 162 and the positioning groove 23 enable the valve body gasket 16 and the valve cover 2 to be quickly pre-positioned, effectively preventing circumferential or radial displacement during the tightening process. This ensures that the connecting bolt can pass smoothly through the first connecting hole 22 and the second connecting hole 161, which not only improves assembly efficiency and accuracy but also ensures that the valve body gasket 16 is subjected to uniform pressure. This significantly enhances the sealing reliability of the connection end face between the valve cover 2 and the gate valve cap 15, preventing leakage of high-pressure media.

[0032] like Figure 3As shown, an annular valve cylinder mounting plate 53 extends outward from the end of the balance valve cylinder 5, and an annular valve cylinder mounting plate 61 extends outward from the end of the balance valve tube 6. The valve cylinder mounting plate 53 abuts against the valve tube mounting plate 61. The valve cylinder mounting plate 53 has several first mounting holes 531, the valve tube mounting plate 61 has several second mounting holes 611, and the valve cover 2 has several third mounting holes 21. The first mounting holes 531, second mounting holes 611, and third mounting holes 21 are correspondingly arranged. When the balance valve tube 6 passes through the balance valve cylinder 5, the valve tube mounting plate 61 will contact the valve cylinder mounting plate 53. The mounting bolt passes through the first mounting holes 531, second mounting holes 611, and third mounting holes 21 simultaneously, realizing the detachable connection between the balance valve cylinder 5, the balance valve tube 6, and the valve cover 2, maintaining the relative position stability of the balance valve cylinder 5 and the balance valve tube 6, and improving the stability of the balance main gate valve structure.

[0033] The balance valve cylinder 6 has a mounting groove 62, and the valve stem nut 42 is located in the mounting groove 62. Valve stem bearings 63 are located on both sides of the valve stem nut 42 within the mounting groove 62. The valve stem bearings 63 are rotatably engaged with the valve stem 4. A bracket plug 64 is located at the end of the balance valve cylinder 5, and the end of the bracket plug 64 abuts against the balance valve cylinder 6, providing axial positioning for the balance valve cylinder 6. The valve stem nut 42, located in the mounting groove 62 of the balance valve cylinder 6, along with the bracket plug 64, provides axial positioning for the valve stem nut 42 and the valve stem 4, improving the stability of their positions within the valve body 1. The valve stem bearings 63 isolate the valve stem 4 from the balance valve cylinder 6, improving the smoothness of the handwheel 43 rotating the valve stem 4.

[0034] like Figure 1 , Figure 4 As shown, a gate valve cap 15 extends outward from the side of the valve body 1 facing the handwheel 43. The gate valve cap 15 has a receiving cavity 151. The valve cover 2 is installed at the opening of the receiving cavity 151. A push rod assembly 8 is provided inside the receiving cavity 151. The push rod assembly 8 is fixedly connected to the valve cover 2 and is linked with the valve stem 4. The upper end of the push rod assembly 8 slides with the valve cover 2, and the lower end is linked with the valve stem 4, making the axial movement of the valve stem 4 more stable and precise. At the same time, it effectively shares the radial load borne by the valve stem 4, reduces the uneven wear between the valve stem 4 and the valve cover 2 seal, further reduces the operating torque of the handwheel 43, and improves the overall smoothness and reliability of valve operation.

[0035] The push rod assembly 8 includes a valve plug gasket 81 mounted on the valve stem 4 and several push rods 82. One end of each push rod 82 is fixedly connected to the valve plug gasket 81, and the other end passes through the valve cover 2 and into the balance chamber 51. The valve cover 2 is provided with a push rod sealing gland 83. The push rod 82 and the push rod sealing gland 83 are slidably engaged. A balance steel ring 84 is provided at one end of the push rod 82 relative to the valve plug gasket 81. The valve plug gasket 81 moves synchronously with the valve stem 4 and pushes the push rod 82. The push rod 82 slides within the push rod sealing gland 83 and transmits force to the balance steel ring 84 in the balance chamber 51. The balance steel ring 84 applies force evenly to the medium, thereby dynamically balancing the reverse pressure of the medium on the valve plate 41, reducing the resistance to the axial movement of the valve stem 4, making the operation of the handwheel 43 easier. At the same time, the push rod sealing gland 83 ensures the sealing of the sliding part, effectively preventing medium leakage and improving the reliability of the gate valve operation.

[0036] The working principle of this embodiment is as follows: the sealing surface of the valve plate 41 contacts the valve seat 3 to seal the flow pipeline 11, the valve stem 4 is snapped into the valve plate 41, the valve stem 4 is threadedly connected to the valve stem nut 42, the handwheel 43 is fixed at the end of the valve stem 4 relative to the valve plate 41, the medium fills the balance chamber 51 through the guide pipe 13, the medium is in a static state at this time, and the medium in the balance chamber 51 will not exert a downward pushing force on the balance valve plug 7.

[0037] When the handwheel 43 drives the valve stem 4 to rotate, the valve stem 4 moves relative to the valve stem nut 42, causing the valve plate 41 to move upward. The valve plate 41 is misaligned relative to the valve seat 3, and the flow pipeline 11 is opened. The medium flows into and fills the drainage chamber 141 of the drainage box 14. The hydraulic pressure of the medium acts on the lower end of the valve plate 41, applying an upward thrust to the valve stem 4. At the same time, the hydraulic pressure of the medium in the balance chamber 51 will be consistent with the flowing medium. The medium in the balance chamber 51 applies a downward thrust to the upper surface of the balance valve plug 7. Since the upper surface area of ​​the balance valve plug 7 is the same as the lower surface area of ​​the valve plate 41, according to the pressure calculation formula, the thrust is equal to the pressure multiplied by the area. It can be seen that the thrusts at both ends are equal. When in absolute balance, the friction between the thread of the valve stem 4 and the valve stem nut 42 is minimal. No matter the diameter or pressure, the valve can be opened easily and freely, and the torque is the same as the valve under no-load.

[0038] The embodiments described above are merely examples of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these modifications and improvements all fall within the protection scope of this utility model.

Claims

1. A balanced gate valve, comprising a valve body, a valve cover, a valve seat, a valve stem, a valve plate, a valve stem nut, and a handwheel, wherein the valve stem nut is threadedly connected to the valve stem, the valve body has a flow channel for medium flow, the valve seat passes through the flow channel, the valve plate is interference-fitted with the valve seat, the valve stem is rotatably fitted with the valve body, one end of the valve stem is connected to the valve plate and the other end is fixedly connected to the handwheel, and the valve plate and valve stem are linked, characterized in that: The valve cover is connected to a balance valve cylinder, and a balance valve tube is inserted inside the balance valve cylinder. The inner wall of the balance valve cylinder and the outer wall of the balance valve tube form a balance cavity. A first guide hole is opened on the side wall of the balance valve cylinder. A second guide hole is opened on the valve seat connected to the flow pipeline. The first guide hole and the second guide hole are connected by a guide pipe. A balance valve plug is inserted through the balance valve tube. The balance valve plug is interference-fitted with the inner wall of the balance valve cylinder.

2. The balanced assist gate valve according to claim 1, characterized in that: An annular valve cylinder mounting plate extends outward from the end of the balance valve cylinder, and an annular valve cylinder mounting plate extends outward from the end of the balance valve tube. The valve cylinder mounting plate abuts against the valve tube mounting plate. The valve cylinder mounting plate has a plurality of first mounting holes, the valve tube mounting plate has a plurality of second mounting holes, and the valve cover has a plurality of third mounting holes. The first mounting holes, second mounting holes, and third mounting holes are correspondingly arranged.

3. A balanced gate valve according to claim 2, characterized in that: The balance valve cylinder has an installation groove, and the valve stem nut is located in the installation groove. Valve stem bearings are provided on both sides of the valve stem nut in the installation groove. The valve stem bearings are rotatably engaged with the valve stem. The end of the balance valve cylinder has a bracket plug, and the end of the bracket plug abuts against the balance valve cylinder. The bracket plug can axially limit the balance valve cylinder.

4. A balanced assist gate valve according to claim 3, characterized in that: The valve body has a flow box below the valve plate, the flow box has a flow cavity, the flow box has a connection port, the end of the valve plate passes through the connection port, and the connection port is connected to the flow pipeline.

5. A balanced assist gate valve according to claim 4, characterized in that: The valve body extends outward toward the handwheel with a gate valve cap. The gate valve cap has a receiving cavity. The valve cover is installed at the opening of the receiving cavity. The receiving cavity has a push rod assembly. The push rod assembly is fixedly connected to the valve cover and is linked with the valve stem.

6. A balanced assist gate valve according to claim 5, characterized in that: The push rod assembly includes a valve plug gasket mounted on the valve stem and several push rods. One end of each push rod is fixedly connected to the valve plug gasket, and the other end passes through the valve cover and enters the balance chamber. The valve cover is provided with a push rod sealing gland, and the push rod and the push rod sealing gland are slidably engaged. A balance steel ring is provided at one end of the push rod relative to the valve plug gasket.

7. A balanced gate valve according to claim 6, characterized in that: A valve body gasket is provided between the valve cover and the gate valve cap. The valve cover has several first connection holes, and the valve body gasket has a second connection hole corresponding to the first connection holes. The first connection holes and the second connection holes are connected by a connecting bolt to achieve a detachable connection between the valve cover and the valve body gasket.

8. A balanced gate valve according to claim 7, characterized in that: The valve body gasket has a positioning protrusion extending outward from its end face, and the valve cover has a positioning groove that mates with the positioning protrusion. The positioning protrusion can be inserted into the positioning groove to position and install the valve body gasket and the valve cover.

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