A plug valve with a steam seal and system

Abstract

The utility model belongs to metallurgical engineering equipment technical field, concretely relates to a plug valve and system with steam seal. The utility model discloses support frame, upper cover flange, lower cover flange, gate, gate pull rod, multilayer sealing structure and steam seal mechanism. The utility model has reduced valve leakage amount significantly, compares ordinary plug valve leakage amount reduction 80% or above, effectively reduces environmental pollution. The utility model discloses the positive pressure purging function of steam purging mechanism, effectively prevents the leakage of water vapor, dust and coal gas, greatly improves the operating environment, improves the operation safety. The utility model multilayer sealing structure cooperates with steam purging system, significantly improves the sealing performance, reduces the system failure rate, guarantees the stable operation and productivity of carbonization system. The utility model adopts high-temperature corrosion -resistant material and optimized structure design, prolongs valve service life 2-3 times, reduces maintenance cost. The utility model can adapt to different specifications of internal heating type vertical carbonization furnace.

Description

Technical Field

[0001] This utility model belongs to the field of metallurgical engineering equipment technology, specifically relating to a gate valve and system with a steam seal. Background Technology

[0002] In the semi-coke production process, the internally heated vertical carbonization furnace is a crucial piece of equipment, and the reliability of its coke discharge system directly affects the stability of the entire production process. Currently, the semi-coke industry widely adopts dry quenching technology, which effectively reduces the moisture content of coke and improves product quality. However, during the quenching process, a certain amount of water vapor and dust are generated in the sealed chamber, and a small amount of coal gas is also trapped between the coke particles. This poses a severe challenge to the valve sealing control of the coke discharge system.

[0003] Existing gate valve technology has significant shortcomings in handling the complex operating conditions of semi-coke quenching processes. First, the sealing structure of ordinary gate valves cannot effectively prevent the leakage of moisture, dust, and coal gas, leading to large leakage volumes and severe environmental pollution. Second, due to poor sealing performance and harsh operating environments, it not only affects the health and safety of workers but may also exacerbate equipment corrosion. Third, although some companies have attempted to combine gate valves with rotary valves, this combination still does not fundamentally solve the leakage problem; while increasing system complexity, reliability has not been significantly improved. Finally, a failure in the coke discharge system will severely impact the normal operation and production capacity of the entire carbonization system, causing significant economic losses to the company. Utility Model Content

[0004] This utility model provides a gate valve and system with a steam seal. Its purpose is to provide a device and system that can effectively prevent the leakage of water vapor, dust and coal gas, especially when water or steam is sprayed during the coking process. This is to address the problems of poor sealing and large leakage in ordinary gate valves in the prior art, and the serious environmental pollution and harsh operating environment caused by water vapor and dust generated in the sealed chamber and the small amount of coal gas entrained in the coke.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows: A gate valve with a steam seal includes a support frame, an upper cover flange, a lower cover flange, a gate, a gate rod, a multi-layer sealing structure, and a steam seal mechanism. The upper and lower cover flanges are symmetrically and sealingly connected to the upper and lower parts of the support frame. The multi-layer sealing structure is vertically connected between the upper and lower cover flanges and located in the middle of the upper and lower cover flanges. The gate is horizontally positioned in the middle between the upper and lower cover flanges, with one end of the gate vertically passing through the multi-layer sealing structure and detachably connected to one end of the horizontally positioned gate rod. The other end of the gate rod extends to the outside of one side of the support frame. A pressure ring is connected to the connection end between the gate and the gate rod. A steel pressure sleeve is connected to the connection point between the gate rod and the support frame. The steam seal mechanism is connected to the other side of the support frame and detachably connected to the other end of the gate.

[0006] The steam sealing mechanism includes a strip cover and a strip; the strip is horizontally arranged; one end of the strip is placed inside the support frame and detachably connected to the other end of the gate plate, and the other end of the strip extends outside the support frame; the strip and the steam purging mechanism are located on the same side inside the support frame; the strip cover is connected to the support frame and is located on the side where the strip extends outside the support frame; the part of the strip placed outside the support frame is placed inside the strip cover.

[0007] It also includes a steam purging mechanism; the steam purging mechanism is connected to the inside of the other side of the support frame, and a steam inlet is provided on the support frame at the connection point.

[0008] The steam purging mechanism includes a steam distribution pipe and a steam nozzle; the steam nozzle is disposed within the support frame.

[0009] Multiple steam nozzles are provided; the multiple steam nozzles are arranged at multiple positions within the support frame directly opposite the tail of the gate.

[0010] The steam purging mechanism also includes a pressure control device, a temperature monitoring device, a sealing effect monitoring device, and a controller. The pressure control device is used to automatically adjust the steam pressure, and the temperature monitoring device is used to monitor the steam temperature. The sealing effect monitoring device is connected to the upper or lower cover flange and is used to monitor the valve leakage in real time. The controller is electrically connected to the external transmission mechanism of the pressure control device, the temperature monitoring device, the sealing effect monitoring device, and the external steam supply device, respectively, and is used to control the opening and closing of the steam purging mechanism and the gate.

[0011] The supporting frame includes at least a front crossbeam, a rear crossbeam, and side beams; two side beams are provided, and the two side beams are connected between the front crossbeam and the rear crossbeam to form a complete frame structure; the gate pull rod passes horizontally through the center position of the rear crossbeam; the steam purging mechanism is connected to the center position inside the front crossbeam; the front crossbeam and the rear crossbeam adopt a modular structure.

[0012] The multi-layer sealing structure includes an upper pressure strip and a lower pressure strip; the upper pressure strip and the lower pressure strip are connected between the upper cover flange and the lower cover flange, and are located at the connection between the gate and the gate pull rod. When the gate is in the closed state, the upper pressure strip, the lower pressure strip, and the pressure ring seal the space where the gate is located.

[0013] The upper pressure strip, lower pressure strip, and pressure ring are made of high-temperature and corrosion-resistant materials.

[0014] A gate valve system with a steam seal includes at least a gate valve with a steam seal; it also includes a transmission mechanism and a steam supply device; the steam nozzle is connected to an external steam supply device via a steam distribution pipe; the transmission mechanism is connected to a gate lever.

[0015] Beneficial effects: 1. This utility model significantly reduces valve leakage, reducing leakage by more than 80% compared to ordinary slide gate valves, effectively reducing environmental pollution.

[0016] 2. This utility model effectively prevents the leakage of water vapor, dust and gas through the positive pressure purging function of the steam purging mechanism, greatly improves the operating environment and enhances operational safety.

[0017] 3. The multi-layer sealing structure of this utility model, combined with the steam purging system, significantly improves the sealing performance, reduces the system failure rate, and ensures the stable operation and production capacity of the carbonization system.

[0018] 4. This utility model uses high-temperature and corrosion-resistant materials and an optimized structural design, which extends the service life of the valve by 2-3 times and reduces maintenance costs.

[0019] 5. This utility model integrates automatic control and online monitoring functions, realizing precise control of steam parameters and real-time monitoring of sealing effect, thereby improving the system's intelligence level.

[0020] 6. The modular design of this utility model improves the product's versatility and can be adapted to internally heated vertical carbonization furnaces of different specifications, thus having good prospects for industrial application.

[0021] The above description is only an overview of the technical solution of this utility model. In order to better understand the technical means of this utility model and to implement it in accordance with the contents of the specification, the preferred embodiments of this utility model are described in detail below with reference to the accompanying drawings. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is the front view of the slide gate valve of this utility model.

[0024] Figure 2 is a top view of the slide gate valve of this utility model.

[0025] Figure 3 is a left view of the slide gate valve of this utility model.

[0026] Figure 4 is a schematic diagram of the front crossbeam in the slide gate valve of this utility model.

[0027] Figure 5 This is a schematic diagram of the upper cover flange in this utility model.

[0028] In the diagram: 1. Front crossbeam; 2. Rear crossbeam; 3. Upper cover flange; 4. Lower cover flange; 5. Upper pressure strip; 6. Lower pressure strip; 7. Steam inlet; 8. Side beam; 9. Strip; 10. Strip cover; 11. Gate; 12. Steam distribution pipe; 13. Steam nozzle; 14. Pressure ring; 15. Steel pressure sleeve; 16. Fastener; 17. Gate pull rod. Detailed Implementation

[0029] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0030] Example 1: according to Figure 1Figure 5 shows a gate valve with a steam seal, comprising a support frame, an upper cover flange 3, a lower cover flange 4, a gate 11, a gate rod 17, a multi-layer sealing structure, and a steam seal mechanism. The upper cover flange 3 and the lower cover flange 4 are symmetrically and sealingly connected to the upper and lower parts of the support frame. The multi-layer sealing structure is vertically connected between the upper cover flange 3 and the lower cover flange 4, and is located in the middle of the upper cover flange 3 and the lower cover flange 4. The gate 11 is horizontally arranged in the middle between the upper cover flange 3 and the lower cover flange 4. One end of the gate 11 vertically passes through the multi-layer sealing structure and is detachably connected to one end of the horizontally arranged gate rod 17. The other end of the gate rod 17 extends to the outside of one side of the support frame. A pressure ring 14 is connected to the connection end of the gate 11 and the gate rod 17. A steel pressure sleeve 15 is connected to the connection point of the gate rod 17 and the support frame. The steam seal mechanism is connected to the other side of the support frame and is detachably connected to the other end of the gate 11.

[0031] Furthermore, the steam sealing mechanism includes a strip cover 10 and a strip 9; the strip 9 is horizontally arranged; one end of the strip 9 is placed inside the support frame and detachably connected to the other end of the gate 11, and the other end of the strip 9 extends outside the support frame; the strip 9 and the steam purging mechanism are located on the same side inside the support frame; the strip cover 10 is connected to the support frame and is located on the side where the strip 9 extends outside the support frame; the portion of the strip 9 placed outside the support frame is placed inside the strip cover 10.

[0032] In actual use, when it is necessary to open the gate 11, the external transmission mechanism is activated to pull the gate lever 17 outward, causing the gate 11 to move to the left. The insert 9 in the steam sealing mechanism connected to it also moves accordingly. At this time, the material begins to fall from the top of the gate valve. When it is necessary to close the gate 11, the external transmission mechanism is activated to push the gate lever 17 inward. The gate 11 and the insert 9 in the steam sealing mechanism connected to it move accordingly, and the outer side of the insert 9 enters the insert cover 10. At this time, the material at the top of the valve stops falling.

[0033] The steam sealing mechanism in this invention significantly reduces valve leakage, reducing leakage by more than 80% compared to ordinary slide gate valves, thus effectively reducing environmental pollution.

[0034] In some embodiments, a steam purging mechanism is also included; the steam purging mechanism is connected to the interior of the other side of the support frame, and a steam inlet 7 is provided on the support frame at the connection point.

[0035] Furthermore, the steam purging mechanism includes a steam distribution pipe 12 and a steam nozzle 13; the steam nozzle 13 is disposed within the support frame.

[0036] Furthermore, multiple steam nozzles 13 are provided; the multiple steam nozzles 13 are arranged at multiple positions within the support frame directly opposite the tail of the gate 11.

[0037] In actual use, when the gate valve 11 needs to be opened, the transmission mechanism is activated, pulling the gate lever 17 outward, causing the gate valve 11 to move to the left. The connecting strip 9 moves accordingly, and simultaneously the steam inlet 7 is opened. The steam distribution pipe 12 and steam nozzle 13 work synchronously, with the steam pressure automatically adjusted within 0.2-0.8 MPa and the steam temperature controlled within 120-200℃. At this time, the material begins to fall from the top of the gate valve. The steam purging mechanism uses positive steam purging to prevent external media from entering the gate valve body and to prevent the leakage of gas and water vapor carried by the material. When the gate valve 11 needs to be closed, the transmission mechanism is activated, pushing the gate lever 17 inward. The gate valve 11 and the connecting strip 9 move accordingly, and the outer side of the strip 9 enters the strip cover 10. Simultaneously, the steam inlet 7 is closed, and the steam distribution pipe 12 and steam nozzle 13 stop working synchronously. At this time, the material above the valve stops falling. Multiple steam nozzles 13 are located inside the front crossbeam 1. The number of steam nozzles 13 should be no less than 3, and the principle is to set one every 100mm.

[0038] This invention effectively prevents the leakage of water vapor, dust and gas by using the positive pressure purging function of the steam purging mechanism, greatly improving the operating environment and enhancing operational safety.

[0039] Furthermore, in some embodiments, the steam purging mechanism also includes a pressure control device, a temperature monitoring device, a sealing effect monitoring device, and a controller. The pressure control device is used to automatically adjust the steam pressure, and the temperature monitoring device is used to monitor the steam temperature. The sealing effect monitoring device is connected to the upper cover flange 3 or the lower cover flange 4 to monitor the leakage of the valve in real time. The controller is electrically connected to the external transmission mechanism of the pressure control device, the temperature monitoring device, the sealing effect monitoring device, and the external steam supply device, respectively, to control the opening and closing of the steam purging mechanism and the gate 11.

[0040] In actual use, the pressure control device, temperature monitoring device, and sealing effect monitoring device transmit the test results to the controller in a timely manner, and monitor the working status of the slide gate valve with steam seal in real time to ensure that the slide gate valve always maintains a stable and safe state.

[0041] This invention integrates automatic control and online monitoring functions, enabling precise control of steam parameters and real-time monitoring of sealing performance, thereby improving the level of intelligence.

[0042] In some embodiments, the support frame includes at least a front crossbeam 1, a rear crossbeam 2, and side beams 8; two side beams 8 are provided, and the two side beams 8 are connected between the front crossbeam 1 and the rear crossbeam 2 to form a complete frame structure; the gate pull rod 17 passes horizontally through the center position of the rear crossbeam 2; the steam purging mechanism is connected to the center position inside the front crossbeam 1; the front crossbeam 1 and the rear crossbeam 2 adopt a modular structure.

[0043] The support frame adopts this structure, resulting in a compact overall structure while effectively fulfilling its function. The front crossbeam 1 and rear crossbeam 2 utilize a modular structure, enhancing the product's versatility and enabling it to adapt to different specifications of internally heated vertical carbonization furnaces, demonstrating promising prospects for industrial application.

[0044] In some embodiments, the multi-layer sealing structure includes an upper pressure strip 5 and a lower pressure strip 6; the upper pressure strip 5 and the lower pressure strip 6 are connected between the upper cover flange 3 and the lower cover flange 4, and are located at the connection between the gate 11 and the gate pull rod 17. When the gate 11 is in the closed state, the upper pressure strip 5, the lower pressure strip 6, and the pressure ring 14 seal the space where the gate 11 is located.

[0045] Furthermore, the upper pressure strip 5, the lower pressure strip 6, and the pressure ring 14 are made of high-temperature and corrosion-resistant materials.

[0046] In actual use, the upper pressure strip 5, the lower pressure strip 6 and the pressure ring 14 cooperate to form a better sealing structure, which significantly improves the sealing performance, reduces the system failure rate, and ensures the stable operation and production capacity of the carbonization system.

[0047] The upper pressure strip 5, the lower pressure strip 6, and the pressure ring 14 are made of high-temperature and corrosion-resistant materials, which can withstand temperatures up to 400℃, extending the service life of the valve by 2-3 times and reducing maintenance costs.

[0048] In this embodiment, the upper pressure strip 5 and the lower pressure strip 6 are made of heat-resistant steel 1Cr18Ni9Ti, and the pressure ring 14 is made of ZQSn5-5-5.

[0049] Example 2: Reference Figure 1 Figure 5 shows a gate valve system with a steam seal, comprising at least a gate valve with a steam seal; it also includes a transmission mechanism and a steam supply device; the steam nozzle 13 is connected to an external steam supply device via a steam distribution pipe 12; the transmission mechanism is connected to a gate lever 17.

[0050] In actual use, the gate lever 17 is connected to the external transmission mechanism, and the steam nozzle 13 is connected to the external steam supply device through the steam distribution pipe 12. When the gate 11 needs to be opened, the transmission mechanism is activated, pulling the gate lever 17 outward, which in turn pulls the gate 11 to the side of the rear crossbeam 2. The connecting strip 9 moves accordingly, and the steam inlet 7 is opened simultaneously. The steam distribution pipe 12 and the steam nozzle 13 work synchronously, and the steam pressure is automatically adjusted within the range of 0.2-0.8 MPa, while the steam temperature is controlled between 120-20°C. Within the 0℃ range; at this time, the material begins to fall from the top of the slide gate valve. The steam purging mechanism prevents external media from entering the slide gate valve body through positive steam purging and prevents the leakage of gas and water vapor carried by the material. When it is necessary to close the gate 11, the transmission mechanism is activated to push the gate pull rod 17 inward, which moves the gate 11 and the strip 9 connected to it, and makes the strip 9 enter the inside of the strip cover 10. At the same time, the steam inlet 7 is closed, and the steam distribution pipe 12 and the steam nozzle 13 stop working synchronously. At this time, the material above the valve stops falling.

[0051] Example 3: Examples of slide gate valve applications under high temperature and high pressure conditions.

[0052] To address the harsh operating conditions of the coke discharge system in an internally heated vertical carbonization furnace, a slide gate valve with a steam seal was designed and manufactured. The front crossbeam 1 and rear crossbeam 2 are made of Q345R steel, with an H-shaped cross-section, 800mm high, 200mm wide, and 20mm thick. They are connected by four side beams to form a frame structure with dimensions of 1200mm × 800mm × 600mm. The upper cover flange 3 and lower cover flange 4 are made of 16MnR material, with flange specifications of DN800 and PN2.5MPa. The upper pressure strip 5 and lower pressure strip 6 are made of heat-resistant steel 1Cr18Ni9Ti, 1000mm long, 80mm wide, and 15mm thick, forming a three-layer sealing structure together with a graphite spiral wound gasket, a PTFE sealing ring, and an O-ring. The steam purging mechanism design includes a DN50 steam inlet 7, a 25mm diameter 316L stainless steel distribution pipeline, and 16 evenly distributed φ8mm steam nozzles 13 around the gate 11. The pressure control device uses an electric regulating valve in conjunction with a pressure sensor to achieve ±0.01MPa accuracy control within the range of 0.2-0.8MPa. The temperature monitoring device uses a PT100 platinum resistance thermometer with a monitoring accuracy of ±1℃. The insert 9 located on the sealing contact surface on the right side of the support frame is made of Stellite alloy weld overlay, 3mm thick, with a hardness of HRC45-50, and the insert cover 10 is made of 304 stainless steel.

[0053] Technical benefits: Under steam pressure of 0.6MPa and temperature of 160℃, the valve sealing leakage is reduced to 0.05±0.02L / min, a 98% reduction compared to the traditional slide gate valve's 2.5L / min, effectively solving the environmental pollution problem. The frame structure rigidity is increased by 40%, and the service life is extended to more than 5 years.

[0054] Example 4: An example of an economical configuration of a slide gate valve for use in low-pressure and low-temperature operating conditions.

[0055] For relatively mild coke discharge conditions, an economical design scheme is adopted. The frame structure uses Q235B steel, and the beam cross-section is simplified to a rectangular structure with dimensions of 600mm × 150mm × 15mm. The flange specification is adjusted to DN600, PN1.6MPa. The steam purging system is optimized to a DN40 air inlet, the distribution pipeline diameter is 20mm, and the number of steam nozzles is reduced from 13 to 12, φ6mm. The sealing structure adopts a double-layer design, mainly relying on graphite metal spiral wound gaskets and PTFE sealing rings. The inserts are made of chromium-molybdenum steel with a thickness of 2mm and a hardness of HRC35-40.

[0056] Technical results: Under relatively mild operating conditions, the leakage rate is controlled at 0.08±0.03L / min, which is more than 95% lower than the traditional solution, and the equipment cost is reduced by 25% and the operating energy consumption is reduced by 35%.

[0057] The above embodiments four and five are two specific embodiments. In practical applications, the front crossbeam 1 and the rear crossbeam 2 are made of Q345R steel, and the beam cross-section is an H-shaped structure. The size can be selected according to needs. They are connected by four side beams 8 to form a rectangular frame structure that meets the requirements.

[0058] Where there is no conflict, those skilled in the art can combine the relevant technical features in the above examples according to the actual situation to achieve the corresponding technical effects. Specific details of the various combinations will not be elaborated here.

[0059] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0060] Furthermore, the use of terms such as "first" and "second" in this utility model is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features.

[0061] The above description is merely a preferred embodiment of the present invention. The present invention is not limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein. Any simple modifications, equivalent variations, and alterations made to the above embodiments based on the technical essence of the present invention shall still fall within the scope of the present invention.

Claims

1. A slide gate valve with a steam seal, characterized in that: The system includes a support frame, an upper cover flange (3), a lower cover flange (4), a gate (11), a gate tie rod (17), a multi-layer sealing structure, and a steam sealing mechanism. The upper cover flange (3) and the lower cover flange (4) are symmetrically and sealingly connected to the upper and lower parts of the support frame. The multi-layer sealing structure is vertically connected between the upper cover flange (3) and the lower cover flange (4) and is located in the middle of the upper cover flange (3) and the lower cover flange (4). The gate (11) is horizontally arranged between the upper cover flange (3) and the lower cover flange (4). In the middle of the space, one end of the gate (11) passes vertically through the multi-layer sealing structure and is detachably connected to one end of the horizontally arranged gate rod (17). The other end of the gate rod (17) extends to the outside of one side of the support frame. A pressure ring (14) is connected to the connection end of the gate (11) and the gate rod (17). A steel pressure sleeve (15) is connected to the connection point of the gate rod (17) and the support frame. The steam sealing mechanism is connected to the other side of the support frame and is detachably connected to the other end of the gate (11). It also includes a steam purging mechanism; the steam purging mechanism is connected to the inside of the other side of the support frame, and a steam inlet (7) is provided on the support frame at the connection.

2. A slide gate valve with a steam seal as described in claim 1, characterized in that: The steam sealing mechanism includes a strip cover (10) and a strip (9); the strip (9) is horizontally arranged; one end of the strip (9) is placed inside the support frame and is detachably connected to the other end of the gate (11), and the other end of the strip (9) extends outside the support frame; the strip (9) and the steam purging mechanism are placed on the same side inside the support frame; the strip cover (10) is connected to the support frame and is located on the side where the strip (9) extends outside the support frame; the part of the strip (9) placed outside the support frame is placed inside the strip cover (10).

3. A slide gate valve with a steam seal as described in claim 1, characterized in that: The steam purging mechanism includes a steam distribution pipe (12) and a steam nozzle (13); the steam nozzle (13) is disposed within the support frame.

4. A slide gate valve with a steam seal as described in claim 3, characterized in that: Multiple steam nozzles (13) are provided; multiple steam nozzles (13) are arranged in multiple positions within the support frame directly opposite the tail of the gate (11).

5. A slide gate valve with a steam seal as described in claim 2, 3, or 4, characterized in that: The steam purging mechanism also includes a pressure control device, a temperature monitoring device, a sealing effect monitoring device, and a controller. The pressure control device is used to automatically adjust the steam pressure, and the temperature monitoring device is used to monitor the steam temperature. The sealing effect monitoring device is connected to the upper cover flange (3) or the lower cover flange (4) and is used to monitor the leakage of the valve in real time. The controller is electrically connected to the external transmission mechanism of the pressure control device, the temperature monitoring device, the sealing effect monitoring device, and the external steam supply device, respectively, and is used to control the opening and closing of the steam purging mechanism and the gate (11).

6. A slide gate valve with a steam seal as described in claim 1, characterized in that: The supporting frame includes at least a front crossbeam (1), a rear crossbeam (2), and side beams (8); two side beams (8) are provided, and the two side beams (8) are connected between the front crossbeam (1) and the rear crossbeam (2) to form a complete frame structure; the gate pull rod (17) passes horizontally through the center position of the rear crossbeam (2); the steam purging mechanism is connected to the center position inside the front crossbeam (1); the front crossbeam (1) and the rear crossbeam (2) adopt a modular structure.

7. A slide gate valve with a steam seal as described in claim 1, characterized in that: The multi-layer sealing structure includes an upper pressure plate (5) and a lower pressure plate (6); the upper pressure plate (5) and the lower pressure plate (6) are connected between the upper cover flange (3) and the lower cover flange (4), and are located at the connection between the gate (11) and the gate pull rod (17). When the gate (11) is in the closed state, the upper pressure plate (5), the lower pressure plate (6), and the pressure ring (14) seal the space where the gate (11) is located.

8. A slide gate valve with a steam seal as described in claim 7, characterized in that: The upper pressure strip (5), lower pressure strip (6), and pressure ring (14) are made of high-temperature and corrosion-resistant materials.

9. A slide gate valve system with a steam seal, characterized in that: It includes at least a gate valve with a steam seal as described in any one of claims 1-8; it also includes a transmission mechanism and a steam supply device; the steam nozzle (13) is connected to an external steam supply device via a steam distribution pipe (12); the transmission mechanism is connected to a gate lever (17).

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