Double-gate-plate gate valve with upper flow guide hole

Abstract

The gate valve comprises a valve seat, a valve body, a valve cover, a wear plate assembly, a valve plate, a valve rod, a wedge block frame, a wedge block cover plate, a disc spring assembly, a flow guide hole assembly, a support assembly and an executing mechanism, and the flow guide hole is formed in the upper portion of the valve plate. When the valve is closed, the valve plate moves in place, the wedge block frame expands the valve plate, and the valve plate is tightly attached to the valve seat to form sealing. When the valve is opened, the wedge block frame loosens the valve plate, and the glasses plate assembly and the valve plate move downwards together until the valve is fully opened. Coking and material accumulation of the valve cavity are effectively reduced, material accumulation in the flow guide hole is avoided, the problem of valve operation jamming can be avoided, and the operation safety index of the valve is improved.

Description

Technical Field

[0001] This invention relates to a double gate valve with an upper guide hole, belonging to the field of industrial valve design technology. Background Technology

[0002] Double-gate valves with guide orifices typically have a bottom-mounted guide orifice, meaning the orifice is below the flow channel and installed in an spectacle-type guide plate assembly. The two valve plates are also installed in this assembly. When the valve is closed, the two valve plates are wedge-shaped and pressed tightly against the valve seat, forming a forced seal. During valve opening and closing, the valve plates remain in close contact with the guide plate, moving without gaps to create a floating seal, preventing the medium from entering the valve cavity during opening and closing. When the valve is fully open, it acts like a straight-through pipe, with the guide orifice assembly and valve seat forming an elastic seal to prevent the medium from entering the valve cavity. This type of valve operates in two steps: when closing, the valve plate moves into position before opening the seal; when opening, the valve plate contracts and then moves upward. A disc spring assembly is installed on the valve stem to prevent premature expansion of the valve plates during closing.

[0003] Because these valves are used in applications involving heavy components and conditions prone to coking, the double-gate valve with a lower guide orifice currently exhibits the following problems during operation: 1) Coking in the valve cavity.

[0004] 2) The medium velocity is high at a small opening, which scours the sealing surface of the outlet valve seat.

[0005] 3) Material accumulation occurs in the guide hole when the valve is switched on and off, meaning that coking particles accumulate in the guide hole and cannot be discharged.

[0006] 4) The coking particles in the guide hole pose a risk of scratching the internal parts when the valve is activated.

[0007] The reasons for this are as follows: the medium is a gaseous cracking product, but it has coking properties, leading to coking during use. The valve is installed vertically, meaning the flow channel is horizontal and the valve stem is vertical, causing most of the coke to accumulate at the bottom of the flow channel. When the valve is closed, the guide orifice moves downwards, allowing coke to enter the valve cavity. This coke accumulates further, affecting the valve's opening and closing action. Simultaneously, at small valve openings, the high medium flow rate, due to the downward-positioned guide orifice, causes the medium and coke particles to scour the valve seat, damaging the sealing surface and ultimately leading to seal failure and compromised valve performance. Summary of the Invention

[0008] The technical problem solved by this invention is to overcome the shortcomings of the prior art and propose a double gate valve with an upper guide hole, which effectively reduces or minimizes coking and material accumulation in the valve cavity, prevents material accumulation in the guide hole, avoids valve jamming, and improves the valve's operational safety index.

[0009] The technical solution of this invention is: A double gate valve with an upper-mounted flow guide hole includes a valve seat, a valve body, a valve cover, a spectacle plate assembly, a valve plate, a valve stem, a wedge block holder, a wedge block cover plate, a disc spring assembly, a flow guide hole assembly, a support assembly, and an actuator. The valve seat is fixed to the valve body, and the valve cover is fixedly connected to the valve body; The spectacle plate assembly includes two rectangular plates, each with two circular holes, and a horizontal plate. The two rectangular plates are located on both sides of the horizontal plate, and the holes on opposite sides of the two rectangular plates are concentric. A pair of circular holes near the horizontal plate are used to place the flow guide hole assembly. The wedge frame is disposed between two rectangular plates of the spectacle plate. The wedge frame has an open top structure and a wedge-shaped surface on the horizontal plate. The wedge cover plate has a bottom opening structure, and a connector is provided on the horizontal plate of the cover plate. The two vertical plates are respectively connected to the two vertical plates of the wedge frame. The valve plate includes a circular plate and a wedge block fixed at the center of the circular plate; the circular plate is placed in a pair of circular holes on the spectacle plate assembly away from the horizontal plate, and the wedge block is in contact with the wedge-shaped surface of the wedge block holder; The disc spring assembly connects the cover plate on the wedge cover plate to the cross plate of the spectacle plate assembly; One end of the valve stem is fixed to the connector of the wedge cover plate, and after passing through the valve cover and bracket assembly, the other end is connected to the actuator, which drives the valve stem to move.

[0010] Furthermore, the disc spring assembly includes a special-shaped bolt, a disc spring, a disc spring washer, a tightening nut, and a locking nut; the special-shaped bolt is tightened to the cross plate of the spectacle plate assembly and passes through the cover plate cross plate on the wedge block cover plate; the disc spring presses against the cover plate cross plate, and the disc spring washer, tightening nut, and locking nut are arranged sequentially on the disc spring, and the tightening nut and locking nut are installed on the stud of the special-shaped bolt.

[0011] Furthermore, the horizontal plate of the spectacle plate assembly has an irregularly shaped hole, and the bolt head of the irregularly shaped bolt has a large and a small end. The large end, after engaging with the horizontal plate of the spectacle plate assembly, restricts the irregularly shaped bolt from dislodging from the horizontal plate, while the small end engages with the irregularly shaped hole to restrict the bolt from rotating relative to the spectacle plate assembly.

[0012] Furthermore, the disc spring assembly is pre-compressed during installation to generate elastic potential energy in the disc spring.

[0013] Furthermore, the valve is also provided with a guide plate with a central opening, and a boss is provided on the valve seat. The height of the boss is the same as the thickness of the guide plate, and the size of the central hole of the guide plate is consistent with the outer diameter of the boss. The guide plate is sleeved on the boss of the valve seat, and the sealing surface of the flow guide hole is in contact with the guide plate.

[0014] Furthermore, the valve cover is provided with a packing cavity, through which the valve stem passes; the packing cavity is filled with packing, which is pressed by a packing gland and a packing sleeve, and the packing gland is connected to the valve cover.

[0015] Furthermore, the valve body and valve cover are sealed by a gasket and connected by nuts and bolts.

[0016] Furthermore, when the valve is closed, the actuator drives the valve stem to move upward, which in turn moves the wedge cover plate upward. The wedge cover plate, through a special bolt, moves the spectacle plate and the wedge bracket upward. The special bolt stops moving upward after hitting the valve cover, meaning the spectacle plate assembly stops moving upward. The valve stem continues to drive the wedge cover plate to compress the disc spring, and the wedge cover plate moves the wedge bracket upward. Since the wedge-shaped surface in the wedge bracket fits against the wedge-shaped surface of the valve plate, and the valve plate does not move upward in conjunction with the spectacle plate, the valve plate is only moved outward by the wedge bracket. When the valve plate is pressed tightly against the valve seat, the actuator stops operating, the valve stem stops moving, and the valve plate and the valve seat sealing surface are tightly pressed together to form a seal.

[0017] Furthermore, when the valve is opened, the actuator drives the valve stem to move downward, the valve stem drives the wedge cover plate to move downward, the wedge bracket releases the valve plate, and the disc spring returns to its initial compressed state. At this time, the wedge cover plate is in contact with the cross plate of the spectacle plate assembly. Subsequently, the spectacle plate assembly and the valve plate move downward until the valve is fully open, and the guide hole is in contact with the valve seat sealing surface to form an elastic seal.

[0018] Furthermore, when the valve is in the closed position, the coking particles are blocked below the inlet pipe; when the valve is opened downwards, the valve plate and spectacle plate assembly block the coking particles; when the valve is fully open, the lowest point of the guide hole is flush with the flow channel, and the coking particles flow with the medium to the outlet; when the valve is closed upwards, the coking particles in the guide hole are carried by the medium to the outlet.

[0019] The advantages of this invention compared to the prior art are: (1) Reduce or minimize coking in the valve cavity. The guide hole designed in this invention is installed above the valve plate. When the valve is closed, the guide hole moves upward, preventing heavy components or coking particles from entering the valve cavity and forming coke.

[0020] (2) No material will accumulate in the guide hole, preventing frictional damage to the internal components. Common guide holes are installed below the flow channel; due to gravity, coking particles will remain inside and cannot be discharged. When the valve is running, these coking particles will damage the valve internals, affecting valve performance. In this invention, the guide hole is installed above the flow channel, preventing coking particles from remaining inside and avoiding damage to the internal components.

[0021] (3) It avoids valve seat erosion and extends the service life of the sealing surface. Because coking particles are affected by gravity and accumulate at the bottom of the flow channel, the guide hole of this invention is installed above the flow channel. Therefore, when the valve is open, only the gas medium flows through. Although the speed is fast, it does not cause any damage to the valve seat sealing surface. When the valve is fully open, the coking particles will flow through the valve with the medium. At this time, the medium flow rate has been reduced and the sealing surface is in a protected state. Therefore, the sealing surface will not be eroded and damaged, and the service life is longer.

[0022] (4) Disc spring assembly prevents valve jamming during operation. The present invention uses disc spring assembly to prevent the wedge block frame and valve plate from expanding apart before they are in the correct position, which can effectively avoid valve jamming and improve the valve operation safety index.

[0023] (5) Coking in the valve cavity does not affect the valve's closed-position sealing. Since the valve stem moves upward to press the wedge block against the valve plate when the valve is closed, the coking at the bottom of the valve cavity will not affect the valve's closed-position sealing. Attached Figure Description

[0024] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings: Figure 1 This is a side view of the closed position of the double gate valve with an upper guide hole according to an embodiment of the present invention. Figure 2 This is a front view of the closed position of the double gate valve with an upper guide hole according to an embodiment of the present invention. Figure 3 This is a side view of the double gate valve with an upper guide hole in the open position according to an embodiment of the present invention; Figure 4 This is a front view of the closed position of the double gate valve with an upper guide hole according to an embodiment of the present invention. Figure 5 This is an isometric view of the wedge block frame according to an embodiment of the present invention; Figure 6 This is an isometric view of the wedge cover plate according to an embodiment of the present invention; Figure 7 This is an isometric view of the spectacle plate assembly according to an embodiment of the present invention; Figure 8 This is an isometric view of an irregularly shaped bolt according to an embodiment of the present invention; Figure 9 This is an isometric view of the valve plate assembly according to an embodiment of the present invention; Figure 10 Schematic diagram of material accumulation and erosion of valve seat in conventional guide hole; Figure 11 This is a schematic diagram of the flow guide hole preventing material accumulation and erosion of the valve seat in an embodiment of the present invention. Detailed Implementation

[0025] Exemplary embodiments of the present disclosure will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

[0026] This invention proposes a double gate valve with an upper guide hole, which is applicable to double gate valves used in heavy component and coking conditions, and is particularly suitable for the ethylene catalytic cracking industry.

[0027] Double gate valve with top-mounted guide hole, such as Figures 1-4 As shown, it includes a valve seat 201, a valve body 202, a valve cover 203, a guide plate 101, a spectacle plate assembly 102, a flow guide hole 104, a valve plate 103, a valve stem 105, a wedge block holder 106, a wedge block cover plate 107, a pin 108, a disc spring assembly, a nut 211, a bolt 212, a bracket assembly 215, and an actuator 205.

[0028] The valve body 202 and the valve cover 203 are sealed by a gasket 204 and connected by a nut 211 and a bolt 212. The valve body 202 is welded to the valve seat 201.

[0029] The valve seat 201 has a boss structure. The height of the boss is similar to the thickness of the guide plate. The size of the opening in the middle of the guide plate is the same as the outer diameter of the boss. The guide plate is finally sleeved on the boss of the valve seat, that is, the guide plate 101 is installed on the valve seat. The function of the guide plate is to prevent the valve plate and the flow guide hole from detaching from the spectacle plate and to play a limiting role. At the same time, when the spectacle plate, valve plate, flow guide hole and other internal components move in the valve cavity, they play a certain guiding role to prevent deflection.

[0030] A guide hole 104 is installed in the upper cavity of the spectacle plate assembly 102, and the sealing surface of the guide hole 104 is in contact with the guide plate 101. A valve plate 103 is installed in the lower cavity of the spectacle plate assembly 102, and the wedge-shaped surface of the valve plate 103 is freely in contact with the wedge-shaped surface of the wedge block frame 106. The wedge block frame 106 is connected to the wedge block cover plate 107 by a pin 108. The horizontal plate of the wedge block cover plate 107 is connected to the horizontal plate of the spectacle plate assembly 102 by two sets of disc spring assemblies.

[0031] Wedge block frame 106 Figure 5 As shown, it includes a horizontal wedge plate and a vertical plate. The horizontal wedge plate has a wedge-shaped surface that is used to mate with the wedge-shaped surface of the valve plate. The two vertical plates have pin holes and pin holes that mate with the pin holes of the wedge cover plate. Finally, they are connected by a pin shaft to realize the connection between the wedge frame and the wedge cover plate.

[0032] The wedge cover plate 107 adopts a welded structure, such as... Figure 6 As shown, it includes a connector, a horizontal cover plate, and vertical plates. The connector is connected to the horizontal cover plate to connect the wedge cover plate to the valve stem. The horizontal cover plate has an opening for connecting to the disc spring assembly. The two vertical plates have openings for connecting to the wedge block frame.

[0033] Spectrum assembly 102 Figure 7 As shown, two rectangular plates, each with two circular holes, are welded together with a horizontal plate with irregularly shaped holes and two positioning blocks. The two rectangular plates are located on both sides of the horizontal plate with irregularly shaped holes and are positioned by the two positioning blocks to make the holes of the two rectangular plates concentric. The circular hole closer to the horizontal plate with irregularly shaped holes on the rectangular plates is used to place the flow guide hole assembly, and the circular hole farther away from the horizontal plate with irregularly shaped holes is used to place the valve plate assembly. The wedge-shaped surface in the valve plate assembly is in contact with the wedge-shaped surface of the horizontal plate of the wedge block frame. The wedge block frame is placed between the two rectangular plates of the spectacle plate and is connected to the wedge block cover plate by a pin. The wedge block cover plate is connected to the horizontal plate of the spectacle plate by a disc spring assembly. The irregularly shaped holes in the horizontal plate of the spectacle plate cooperate with the irregularly shaped bolts in the disc spring assembly to prevent the irregularly shaped bolts from rotating relative to the horizontal plate of the spectacle plate. The spectacle plate assembly serves to connect the internal components.

[0034] Valve plate 103 Figure 9 As shown, the valve plate includes a circular plate and a wedge-shaped block, with the wedge-shaped block located at the center of the circular plate. The valve plate is a welded or cast structure. Since both the circular and rectangular plates of the valve plate have a certain thickness, the circular plate is placed within the opening of the spectacle plate. The wedge-shaped surface of the valve plate wedge-shaped block mates with the wedge-shaped surface of the wedge-shaped block holder to prevent the valve plate from moving inward. A guide plate hanging on the valve seat restricts the valve plate from moving outward and falling out of the spectacle plate opening. Therefore, the spectacle plate, wedge-shaped block holder, and guide plate work together to prevent the valve plate from falling and to maintain its position.

[0035] The disc spring assembly includes a special-shaped bolt 109, a disc spring 110, a disc spring washer 111, a tightening nut 112, and a locking nut 113. The special-shaped bolt 109 is as follows: Figure 8 As shown, the assembly includes two parts: a special-shaped bolt head and a stud. The special-shaped bolt head includes a large and a small end. The large end, after engaging with the horizontal plate of the spectacle plate, prevents the bolt from dislodging from the horizontal plate. The small end engages with the special-shaped opening in the spectacle plate, preventing the bolt from rotating relative to the spectacle plate. The stud is connected to a nut. The special-shaped bolt 109 is tightened together with the horizontal plate of the spectacle plate assembly 102 to prevent relative movement between the two. The special-shaped bolt 109 also passes through the wedge cover plate 107. The disc spring 110 presses against the wedge cover plate 107 and is installed on the special-shaped bolt 109. At the same time, the disc spring washer 111, the tightening nut 112, and the locking nut 113 are arranged sequentially on the disc spring 110 and installed on the special-shaped bolt 109.

[0036] The connector of the wedge cover plate 107 is installed together with the valve stem 105. The valve stem 105 passes through the packing cavity on the valve cover 203. Packing 206 is installed in the packing cavity and is pressed by the packing gland 207 and the packing sleeve 208. The packing gland 208 is connected to the valve cover 203 by studs 210 and nuts 209. The valve cover 203 is connected to the bracket assembly 215 by nuts 213 and bolts 214. An actuator 205 (manual, electric, or pneumatic) is installed on the bracket assembly 215 to drive the valve stem 105 to move. When closed, the wedge holder 106 tightens the valve plate 103. The principle is that the valve stem 105 moves upward, causing the wedge cover plate 107 to move upward. The wedge cover plate 107, through the special bolt 109 and pin 108, causes the spectacle plate 102 and the wedge holder 106 to move upward. The special bolt 109 stops moving upward after hitting the valve cover 203, meaning the spectacle plate 102 stops moving upward. However, the valve stem 105 continues to drive the wedge cover plate 107 to compress the disc spring 110. Similarly, the wedge cover plate 107... The pin 108 drives the wedge holder 106 to move upward. Since the wedge-shaped surface of the wedge holder 106 fits against the wedge-shaped surface of the valve plate 103, and the valve plate 103, in conjunction with the spectacle plate 102, will not move upward, the valve plate 103 will only be moved outward by the wedge holder 106. Because the torque of the actuator can be set, when the valve plate 103 is pressed against the valve seat 201, the actuator stops operating, the valve stem stops moving, and ultimately the valve plate 103 and the sealing surface of the valve seat 201 are tightly fitted together to form a seal. When the valve is in the open position, the guide hole 104 fits against the sealing surface of the valve seat 201, forming an elastic seal.

[0037] The function of the disc spring assembly is to prevent the wedge block frame 106 from prematurely expanding the valve plate 103 during the valve opening and closing process, which would cause the valve to jam. That is, the valve plate 103 is expanded by the wedge block frame 106 before the valve reaches the closed position. During installation, the disc spring assembly pre-compresses the disc spring 110, generating elastic potential energy to overcome the friction between the internal components and the guide plate during valve operation. When the valve reaches the closed position, the shaped bolt 109 in the disc spring assembly contacts the valve cover 203, forming a limit. Therefore, the spectacle plate assembly 102, the guide hole 104 installed on the spectacle plate assembly 102, and the valve plate 103 no longer move upward. At this time, the valve stem 105 continues to drive the wedge cover plate 107 and the wedge bracket 106 to run. The wedge cover plate 107 compresses the disc spring 110, causing the wedge bracket 106 to expand the valve plate 103 (at this time, there is a gap between the wedge cover plate 107 and the cross plate of the spectacle plate assembly 102). The valve plate 103 then presses against the valve seat 201 to form a seal. When the valve is opened, the valve stem 105 drives the wedge cover plate 107 to move downward, the wedge bracket 106 releases the valve plate 103, and the disc spring 110 returns to its initial compressed state. At this time, the wedge cover plate 107 and the horizontal plate of the spectacle plate assembly 102 are in contact. Then the spectacle plate assembly 102, the valve plate 103, the guide hole 104, etc. move downward together until the valve is fully open.

[0038] Because of the disc spring assembly, when the valve is closed, the valve plate 103 moves to the position and is then expanded by the wedge block 106. When the valve is opened, the wedge block 106 first releases the valve plate 103 and then moves to open it.

[0039] Figure 10 This diagram illustrates a well-known erosion process involving valve seats and material accumulation in the guide orifice. Due to gravity, coking particles accumulate at the bottom of the pipe. When the valve is closed, the valve plate assembly obstructs the flow, causing these particles to accumulate below the valve inlet pipe. As the valve opens upwards, the medium flows towards the outlet. At a small opening, due to the small opening area and high flow velocity, the medium carries the coking particles towards the valve seat sealing surface on the outlet side, causing erosion and affecting the valve seat's lifespan. Similarly, as the valve closes downwards, coking particles or some of the medium accumulate at the bottom of the guide orifice due to gravity. Because the bottom of the guide orifice remains below the lowest point of the flow channel during valve closure, the coking particles or medium cannot exit the guide orifice, ultimately leading to material accumulation.

[0040] Figure 11 This is a schematic diagram illustrating how the guide hole of this invention prevents material accumulation and erosion of the valve seat. Because the guide hole is positioned above the valve plate assembly, when the valve is closed, coking particles are blocked below the inlet pipe. When the valve is opened downwards, due to the obstruction of the valve plate and spectacle plate, coking particles still accumulate below the inlet pipe. When the valve is fully open, because the lowest point of the guide hole is flush with the flow channel, the coking particles flow with the medium towards the outlet. When the valve is closed upwards, the coking particles in the guide hole are carried to the outlet by the medium and do not accumulate in the guide hole. Although the medium flow rate is high at small openings, because the opening is above the flow channel, there are no coking particles in the medium, reducing or avoiding erosion of the outlet-side valve seat.

[0041] The embodiments described above are merely preferred embodiments of the present invention. Ordinary variations and substitutions made by those skilled in the art within the scope of the technical solution of the present invention should be included within the protection scope of the present invention.

Claims

1. A double-gate valve with an upper-mounted flow guide orifice, characterized in that, It includes a valve seat, valve body, valve cover, spectacle plate assembly, valve plate, valve stem, wedge block holder, wedge block cover plate, disc spring assembly, flow guide hole assembly, bracket assembly, and actuator; The valve seat is fixed to the valve body, and the valve cover is fixedly connected to the valve body; The spectacle plate assembly includes two rectangular plates, each with two circular holes, and a horizontal plate. The two rectangular plates are located on both sides of the horizontal plate, and the holes on opposite sides of the two rectangular plates are concentric. A pair of circular holes near the horizontal plate are used to place the flow guide hole assembly. The wedge frame is positioned between two rectangular plates of the spectacle plate. The wedge frame has an open top and a wedge-shaped surface on its horizontal plate. The wedge cover plate has an open bottom and a connector on its horizontal plate. Two vertical plates are connected to the two vertical plates of the wedge frame, respectively. The valve plate includes a circular plate and a wedge block fixed at the center of the circular plate; the circular plate is placed in a pair of circular holes on the spectacle plate assembly away from the horizontal plate, and the wedge block is in contact with the wedge-shaped surface of the wedge block holder; The disc spring assembly connects the cover plate on the wedge cover plate to the cross plate of the spectacle plate assembly; One end of the valve stem is fixed to the connector of the wedge cover plate, and after passing through the valve cover and bracket assembly, the other end is connected to the actuator, which drives the valve stem to move.

2. The double-gate valve with an upper guide hole according to claim 1, characterized in that, The disc spring assembly includes a special-shaped bolt, a disc spring, a disc spring washer, a tightening nut, and a locking nut; the special-shaped bolt is tightened to the cross plate of the spectacle plate assembly and passes through the cover plate cross plate on the wedge block cover plate; the disc spring presses against the cover plate cross plate, and the disc spring washer, tightening nut, and locking nut are arranged sequentially on the disc spring, and the tightening nut and locking nut are installed on the stud of the special-shaped bolt.

3. A double-gate valve with an upper guide hole according to claim 2, characterized in that, The cross plate of the spectacle plate assembly has an irregularly shaped hole, and the bolt head of the irregularly shaped bolt has a large and a small end. The large end, after engaging with the cross plate of the spectacle plate assembly, restricts the irregularly shaped bolt from coming out of the cross plate, while the small end engages with the irregularly shaped hole to restrict the bolt from rotating relative to the spectacle plate assembly.

4. A double-gate valve with an upper guide hole according to claim 2, characterized in that, The disc spring assembly is pre-compressed during installation to generate elastic potential energy in the disc spring.

5. A double-gate valve with an upper guide hole according to claim 1, characterized in that, The valve is also equipped with a guide plate with a central opening, and a boss on the valve seat. The height of the boss is the same as the thickness of the guide plate, and the size of the central hole of the guide plate is the same as the outer diameter of the boss. The guide plate is sleeved on the boss of the valve seat, and the sealing surface of the flow guide hole is in contact with the guide plate.

6. A double-gate valve with an upper guide hole according to claim 1, characterized in that, The valve cover is provided with a packing cavity, through which the valve stem passes; the packing cavity is filled with packing, which is pressed by a packing gland and a packing sleeve, and the packing gland is connected to the valve cover.

7. A double-gate valve with an upper guide hole according to claim 1, characterized in that, The valve body and valve cover are sealed by a gasket and connected by nuts and bolts.

8. A double-gate valve with an upper guide hole according to claim 1, characterized in that, When the valve is closed, the actuator drives the valve stem to move upward, which in turn moves the wedge cover plate upward. The wedge cover plate, through a special bolt, moves the spectacle plate and wedge bracket upward. The special bolt stops moving upward after hitting the valve cover, meaning the spectacle plate assembly stops moving upward. The valve stem continues to drive the wedge cover plate to compress the disc spring, and the wedge cover plate moves the wedge bracket upward. Because the wedge-shaped surface in the wedge bracket fits against the wedge-shaped surface of the valve plate, and the valve plate does not move upward in conjunction with the spectacle plate, the valve plate is only moved outward by the wedge bracket. When the valve plate is pressed tightly against the valve seat, the actuator stops operating, the valve stem stops moving, and the valve plate and valve seat sealing surfaces are tightly pressed together to form a seal.

9. A double-gate valve with an upper guide hole according to claim 1, characterized in that, When the valve is opened, the actuator drives the valve stem to move downward, and the valve stem drives the wedge cover plate to move downward. The wedge bracket releases the valve plate, and the disc spring returns to its initial compression state. At this time, the wedge cover plate is in contact with the cross plate of the spectacle plate assembly. Then the spectacle plate assembly and the valve plate move downward until the valve is fully open, and the guide hole is in contact with the valve seat sealing surface to form an elastic seal.

10. A double-gate valve with an upper guide hole according to claim 1, characterized in that, When the valve is in the closed position, coking particles are blocked below the inlet pipe; when the valve is opened downwards, the valve plate and spectacle plate assembly block the coking particles; when the valve is fully open, the lowest point of the guide hole is flush with the flow channel, and the coking particles flow with the medium to the outlet; when the valve is closed upwards, the coking particles in the guide hole are carried by the medium to the outlet.

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