A high temperature resistant valve

Abstract

The present invention discloses a high-temperature resistant valve, which relates to the technical field of valves, comprising a valve body and a valve cover, wherein the valve cover is fixedly mounted on the upper end of the valve body, a valve stem is slidably connected between the valve body and the valve cover, the cooling mechanism is arranged in the valve stem, the cooling mechanism comprises a cooling groove opened in the valve stem, a heat exchanger is arranged in the cooling groove, the adjusting mechanism comprises an adjusting plate slidably connected to the cooling groove, an adjusting box is fixedly connected to one end of the adjusting plate close to the heat exchanger, an end of the heat exchanger close to the adjusting plate is communicated with the adjusting box, a guide cylinder is fixedly connected to the bottom of the cooling groove, a piston rod is slidably connected in the guide cylinder, the free end of the piston rod is fixedly connected to the adjusting plate, a heat expansion gas is filled between the guide cylinder and the piston rod, the flow rate fine-tuning mechanism is arranged in the guide cylinder, and the present invention can improve the effect and efficiency of cooling the valve stem.

Description

Technical Field

[0001] The present invention relates to the technical field of valves, and in particular to a high temperature resistant valve. Background Art

[0002] In the fluid conveying system, valves are indispensable control components, which mainly have the functions of regulation, diversion, backflow prevention, cut-off and diversion. Valves are widely used in industrial and civil fields. High-temperature resistant valves are a more commonly used type of valves. They have good quenching performance, can be deeply quenched, have good welding properties, have good impact absorption performance, are difficult to damage by violence, have less tendency to temper brittleness, etc., and can stably convey high-temperature fluids.

[0003] When the current high-temperature resistant valves are in use, the valve stem is continuously heated in the high-temperature fluid. At this time, the valve stem may change in size due to thermal expansion and contraction under high temperature, which will affect the opening and closing performance of the valve and may even cause damage to the valve. It will also damage the seal between the valve stem and the valve body, causing the sealing effect to fail. When cooling the valve stem, cooling water is generally injected into the valve stem for heat absorption and cooling. However, in this process, the circulation rate of the cooling water is consistent, and the cooling water gradually accumulates. If the heat absorption effect cannot be achieved, it will circulate again, resulting in low cooling efficiency. At the same time, it is also impossible to fully absorb heat from the part of the valve stem with the highest temperature, which easily causes the temperature to gradually transfer to the entire valve stem, making the valve stem unable to maintain a stable working state at high temperatures.

[0004] Therefore, a high temperature resistant valve is invented to solve the above problems. Summary of the invention

[0005] The main purpose of the present invention is to provide a high temperature resistant valve, which can effectively solve the technical problems in the background technology.

[0006] To achieve the above object, the technical solution adopted by the present invention is: a high temperature resistant valve, comprising a valve body and a valve cover, wherein the valve cover is fixedly mounted on the upper end of the valve body, a valve stem is slidably connected between the valve body and the valve cover, and further comprising: A cooling mechanism, the cooling mechanism is arranged in the valve stem, the cooling mechanism comprises a cooling groove opened in the valve stem, a retractable heat exchanger is arranged in the cooling groove, and the heat exchanger is used to provide a channel for cooling water to flow; An adjusting mechanism, wherein the adjusting mechanism comprises an adjusting plate slidably connected to the cooling groove, an end of the adjusting plate close to the heat exchanger is fixedly connected to an adjusting box, an end of the heat exchanger close to the adjusting plate is communicated with the adjusting box, a guide cylinder is fixedly connected to the bottom of the cooling groove, a piston rod is slidably connected in the guide cylinder, a free end of the piston rod is fixedly connected to the adjusting plate, and a space between the guide cylinder and the piston rod is filled with a heat expansion gas for driving the piston rod to slide in the direction of the valve body; A flow rate fine-tuning mechanism is disposed in the guide cylinder and is used to adjust the flow rate of cooling water flowing into the heat exchanger.

[0007] Preferably, the cooling mechanism also includes a water inlet channel opened in the valve stem, one end of the water inlet channel is connected to the flow rate fine-tuning mechanism, the other end of the water inlet channel is fixedly connected to a water inlet pipe extending out of the valve stem, and a water outlet channel is opened in the valve stem, one end of the water outlet channel is connected to the cooling groove, and the other end of the water outlet channel is fixedly connected to a water outlet pipe extending out of the valve stem.

[0008] Preferably, the adjustment mechanism comprises a drainage tube fixedly connected to the adjustment plate, an end of the drainage tube away from the adjustment box extends into the water outlet channel and is slidably connected to the water outlet channel, and an end of the drainage tube close to the adjustment box is connected to the adjustment box.

[0009] Preferably, the flow rate fine-tuning mechanism includes a receiving groove opened in the guide cylinder, and the end of the heat exchanger close to the guide cylinder is connected to the receiving groove. An adjustment block is slidably connected in the receiving groove, and the adjustment block can block the connecting port between the heat exchanger and the receiving groove.

[0010] Preferably, the adjusting block is fixedly connected to a positioning rod at one end close to the piston rod, the free end of the positioning rod extends into the guide cylinder and is fixedly connected to a pressure plate, the pressure plate can contact the piston rod, and the positioning rod is provided with a first elastic member located between the pressure plate and the guide cylinder.

[0011] Preferably, a filter screen is fixedly connected to one end of the water inlet channel close to the water inlet pipe.

[0012] Preferably, a one-way valve is provided at one end of the water inlet channel close to the containing tank, so as to allow cooling water to flow from the water inlet channel to the containing tank in one direction.

[0013] Preferably, both the valve body and the valve cover are provided with an accommodating cavity, the space between the accommodating cavity and the valve stem is filled with a sealing material, and the valve stem is in close contact with the sealing material.

[0014] Preferably, a valve core is fixedly connected to one end of the valve stem close to the valve body, a fluid channel is provided in the valve body, and the valve core can block the fluid channel.

[0015] Preferably, a vertically extending support frame is installed on the upper end of the valve cover, a hydraulic actuator is installed on the upper end of the support frame, and the output end of the hydraulic actuator is fixedly connected to the free end of the valve stem through a coupling.

[0016] Technical effects and advantages of the present invention: 1. The present invention adopts the arrangement of a spiral heat exchanger and a circulating cooling circuit formed by a water inlet channel and a water outlet channel, which can not only continuously cool down the inside of the valve stem to prevent the valve stem from being in a high temperature state all the time, but also ensure the mechanical properties of the valve stem and avoid expansion deformation due to high temperature. At the same time, it prevents the valve stem from transferring high temperature to the sealing material, reduces the impact of temperature on the sealing performance of the sealing material, ensures the sealing between the valve stem and the valve body, and improves the safety when conveying high-temperature fluids.

[0017] 2. The present invention, through the arrangement of the guide cylinder, the piston rod, the adjusting plate and the heat expansion gas, can not only make the piston rod drive the heat exchanger to contract downward through the adjusting plate under the action of the heat expansion gas when the part of the valve stem close to the valve body is rapidly heated, so that the heat absorption distance of the heat exchanger is reduced, but at this time the heat exchanger quickly cools the part of the valve stem with the highest temperature, thereby preventing the heat from spreading to the part of the valve stem with the low temperature. At the same time, during the sliding process of the piston rod, the adjusting block is driven by the pressure plate and the positioning rod to adjust the flow rate of cooling water flowing to the heat exchanger. At this time, by adjusting the flow rate of cooling water, the cooling effect of the heat exchanger on the high-temperature part of the valve stem can be further improved. When the temperature in the valve stem gradually decreases, under the action of the heat expansion gas, the adjusting plate drives the heat exchanger to expand upward, thereby increasing the heat exchange distance between the heat exchanger and the valve stem, facilitating the absorption and removal of residual heat on the valve stem, thereby improving the cooling effect of the valve stem, further ensuring the normal working state of the valve stem, and improving the safety when conveying high-temperature gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0019] Figure 2 It is a schematic diagram of the structure of the valve body and valve cover in the present invention.

[0020] Figure 3 It is a structural cross-sectional view of the valve body and valve cover in the present invention.

[0021] Figure 4 It is a schematic diagram of the structure of the valve stem in the present invention.

[0022] Figure 5It is a cross-sectional view of the valve stem in the present invention.

[0023] Figure 6 For the present invention Figure 5 A partial enlarged view of middle A.

[0024] Figure 7 It is a schematic diagram of the structure of the heat exchanger in the present invention.

[0025] Figure 8 It is a structural cross-sectional view of the heat exchanger in the present invention.

[0026] In the figure: 1. valve body; 2. valve cover; 3. valve stem; 4. Cooling mechanism; 401. Cooling tank; 402. Heat exchanger; 403. Water inlet channel; 404. Water inlet pipe; 405. Water outlet channel; 406. Water outlet pipe; 407. Filter; 408. One-way valve; 5. Adjustment mechanism; 501. Adjustment plate; 502. Adjustment box; 503. Guide cylinder; 504. Piston rod; 505. Thermal expansion gas; 506. Drainage tube; 6. Flow rate fine-tuning mechanism; 601. Accommodating tank; 602. Adjusting block; 603. Positioning rod; 604. Pressing plate; 605. First elastic member; 7. Accommodating chamber; 8. Sealing material; 9. Valve core; 10. Fluid channel; 11. Support frame; 12. Hydraulic actuator; 13. Coupling. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] Embodiment 1 In the prior art, when cooling the valve stem 3 to ensure its mechanical properties, cooling water is usually directly injected into the valve stem 3 for circulation. Directly injecting cooling water into the valve stem 3 not only easily causes rust inside the valve stem 3, but also fails to achieve a better heat exchange effect, and at the same time reduces the service life of the valve stem 3. Therefore, this embodiment is specially invented to solve the above problems.

[0029] like Figures 1 to 6As shown, this embodiment provides a high temperature resistant valve, including a valve body 1 and a valve cover 2, the valve cover 2 is fixedly installed on the upper end of the valve body 1, a valve stem 3 and a cooling mechanism 4 are slidably connected between the valve body 1 and the valve cover 2, the cooling mechanism 4 is arranged in the valve stem 3, the cooling mechanism 4 includes a cooling groove 401 opened in the valve stem 3, a retractable heat exchanger 402 is arranged in the cooling groove 401, the heat exchanger 402 is used to provide a channel for cooling water to flow, and a flow rate fine-tuning mechanism 6 is arranged in the guide cylinder 503, which is used to adjust the flow rate of cooling water flowing into the heat exchanger 402.

[0030] The cooling mechanism 4 also includes a water inlet channel 403 opened in the valve stem 3, one end of the water inlet channel 403 is connected to the flow rate fine-tuning mechanism 6, and the other end of the water inlet channel 403 is fixedly connected to a water inlet pipe 404 extending out of the valve stem 3, and a water outlet channel 405 is opened in the valve stem 3, one end of the water outlet channel 405 is connected to the cooling groove 401, and the other end of the water outlet channel 405 is fixedly connected to a water outlet pipe 406 extending out of the valve stem 3, and one end of the water inlet channel 403 close to the water inlet pipe 404 is fixedly connected to a filter screen 407.

[0031] The valve body 1 and the valve cover 2 are both provided with an accommodating cavity 7, and the space between the accommodating cavity 7 and the valve stem 3 is filled with sealing material 8. The valve stem 3 is in close contact with the sealing material 8. A valve core 9 is fixedly connected to the end of the valve stem 3 close to the valve body 1. A fluid channel 10 is provided in the valve body 1, and the valve core 9 can block the fluid channel 10. A vertically extending support frame 11 is installed on the upper end of the valve cover 2, and a hydraulic actuator 12 is installed on the upper end of the support frame 11. The output end of the hydraulic actuator 12 is fixedly connected to the free end of the valve stem 3 through a coupling 13.

[0032] In actual use, the valve body 1 is first connected to the medium pipeline, and then the valve core 9 is driven to move in the valve body 1 through the hydraulic actuator 12, the coupling 13 and the valve stem 3 to adjust the blocking degree of the valve core 9 on the fluid channel 10. After the adjustment is completed, when the valve stem 3 needs to be cooled, a water pump is first connected through the water inlet pipe 404 and the water outlet pipe 406 to form a cooling circuit, and the connection method of the water pump and the water inlet pipe 404 and the water outlet pipe 406 is the existing technology, and the specific structure is not repeated. The cooling water is pumped into the cooling water pump through the water pump. The cooling water is injected into the heat exchanger 402 through the water inlet pipe 404, the water inlet channel 403 and the flow rate fine-tuning mechanism 6. It should be noted that the heat exchanger 402 is a spiral pipe with a certain elasticity, and a filter net 407 is provided in the water inlet channel 403, which can filter impurities in the cooling water to prevent impurities from flowing into the heat exchanger 402 and affecting the heat absorption effect of the heat exchanger 402, and a sealing material 8 is provided between the valve stem 3 and the accommodating cavity 7 to ensure the sealing between the valve body 1 and the valve stem 3.

[0033] When the cooling water gradually flows upward from the bottom of the heat exchanger 402 along its shape, the cooling water exchanges the temperature inside the valve stem 3 through the heat exchanger 402, so that the temperature on the valve stem 3 is reduced, so that the valve stem 3 can maintain a good working condition, and at the same time, it can also reduce the influence of high temperature on the sealing material 8, thereby ensuring the sealing between the valve stem 3 and the valve body 1. The cooling water flowing out from the upper end of the heat exchanger 402 flows from the valve stem 3 to the outside through the water outlet channel 405 and the water outlet pipe 406 to dissipate heat to a low-temperature state for circulation, and under the action of the water pump, the cooling water can be continuously circulated through the heat exchanger 402, which is convenient for continuously cooling the valve stem 3 and maintaining the normal working condition of the valve stem 3.

[0034] To sum up, through the setting of the spiral heat exchanger 402, and the circulating cooling circuit formed by the water inlet channel 403 and the water outlet channel 405, not only can the inside of the valve stem 3 be continuously cooled to prevent the valve stem 3 from being in a high temperature state all the time, but also the mechanical properties of the valve stem 3 can be guaranteed to avoid expansion deformation due to high temperature, and at the same time, the valve stem 3 can be prevented from transferring the high temperature to the sealing material 8, thereby reducing the impact of temperature on the sealing performance of the sealing material 8, ensuring the sealing between the valve stem 3 and the valve body 1, and improving the safety when transporting high-temperature fluid.

[0035] Embodiment 2 During use, it was found that when cooling the valve stem 3, cooling water is generally injected into the valve stem 3 for circulating heat absorption cooling. However, in this process, the circulation rate of the cooling water is consistent, and the cooling water gradually accumulates. If the heat absorption effect cannot be achieved, it will be circulated again, resulting in low cooling efficiency. At the same time, it is also impossible to fully absorb heat from the part of the valve stem 3 with the highest temperature. This easily causes heat to be gradually transferred to the entire valve stem 3, making it impossible for the valve stem 3 to maintain a stable working state at high temperatures. Therefore, further improvements are made based on the above embodiments.

[0036] like Figures 5 to 8 As shown, the adjustment mechanism 5 includes an adjustment plate 501 slidably connected to the cooling groove 401, an end of the adjustment plate 501 close to the heat exchanger 402 is fixedly connected to the adjustment box 502, and the end of the heat exchanger 402 close to the adjustment plate 501 is connected to the adjustment box 502. A guide cylinder 503 is fixedly connected to the bottom of the cooling groove 401, and a piston rod 504 is slidably connected in the guide cylinder 503. The free end of the piston rod 504 is fixedly connected to the adjustment plate 501, and the space between the guide cylinder 503 and the piston rod 504 is filled with thermal expansion gas 505, which is used to drive the piston rod 504 to slide in the direction of the valve body 1.

[0037] The regulating mechanism 5 includes a drainage tube 506 fixedly connected to the regulating plate 501 , an end of the drainage tube 506 away from the regulating box 502 extends into the water outlet channel 405 and is slidably connected to the water outlet channel 405 , and an end of the drainage tube 506 close to the regulating box 502 is connected to the regulating box 502 .

[0038] The flow rate fine-tuning mechanism 6 includes a receiving groove 601 opened in the guide cylinder 503. One end of the heat exchanger 402 close to the guide cylinder 503 is connected to the receiving groove 601. An adjustment block 602 is slidably connected in the receiving groove 601. The adjustment block 602 can block the connection port between the heat exchanger 402 and the receiving groove 601.

[0039] The end of the adjusting block 602 close to the piston rod 504 is fixedly connected to a positioning rod 603, the free end of the positioning rod 603 extends into the guide cylinder 503 and is fixedly connected to a pressure plate 604, the pressure plate 604 can contact the piston rod 504, the positioning rod 603 is provided with a first elastic member 605 located between the pressure plate 604 and the guide cylinder 503, and a one-way valve 408 is provided at one end of the water inlet channel 403 close to the receiving groove 601, which is used for the unidirectional flow of cooling water from the water inlet channel 403 to the receiving groove 601.

[0040] In actual use, when the temperature inside the valve stem 3 gradually increases, the volume of the heat-expanded gas 505 in the guide cylinder 503 gradually increases after being heated. At this time, under the action of the heat-expanded gas 505, the heat-expanded gas 505 drives the piston rod 504 to slide along the guide cylinder 503 toward the valve core 9. At this time, the piston rod 504 drives the adjustment plate 501 to slide along the cooling groove 401 toward the valve core 9. The adjustment plate 501 drives the drainage pipe 506 to slide downward along the water outlet channel 405. At this time, the adjustment plate 501 slides downward through the adjustment box 5 02 drives the heat exchanger 402 to shrink toward the valve core 9, so that the spacing of the heat exchanger 402 itself is gradually compressed, and the heat exchanger 402 is closer to the valve core 9. At this time, the cooling water can better exchange heat on the valve stem 3 through the heat exchanger 402. At this time, the temperature of the valve stem 3 in the fluid channel 10 can be quickly reduced, and the rate at which the temperature on the valve stem 3 is transferred toward the valve cover 2 is reduced. At this time, not only can the temperature of the valve stem 3 near the valve core 9 be quickly reduced, but also the temperature can be prevented from quickly spreading to the entire valve stem 3.

[0041] In the process that the heat expansion gas 505 is continuously heated and its volume increases, the heat expansion gas 505 drives the piston rod 504 to slide along the guide cylinder 503, so that the piston rod 504 gradually contacts the pressure plate 604, thereby driving the pressure plate 604 to slide in the direction of the valve core 9, and the pressure plate 604 drives the positioning rod 603 to slide, and the positioning rod 603 drives the adjustment block 602 to slide along the receiving groove 601, so that the adjustment block 602 gradually blocks the connection port between the receiving groove 601 and the heat exchanger 402, and the first elastic member 605 is compressed. Since the cooling water injection rate from the water inlet channel 403 into the receiving groove 601 is constant, at this time, the adjustment block 602 blocks a part of the connection port between the heat exchanger 402 and the receiving groove 601, and at this time, the flow rate of the cooling water flowing from the receiving groove 601 to the heat exchanger 402 increases, and within a certain range of the increase in the cooling water flow rate, the cooling water can absorb and exchange the heat on the valve stem 3 through the heat exchanger 402, thereby further improving the heat exchange efficiency between the heat exchanger 402 and the valve stem 3.

[0042] When the portion of the valve stem 3 closest to the valve body 1 is cooled by the heat exchanger 402 and the cooling water, the temperature of the heat-expanded gas 505 in the guide cylinder 503 gradually decreases, causing the volume of the heat-expanded gas 505 to gradually decrease. At this time, under the action of the air pressure difference inside the guide cylinder 503, the piston rod 504 slides along the guide cylinder 503 toward the adjustment plate 501, and the piston rod 504 drives the adjustment plate 501 to slide along the cooling groove 401. At this time, the adjustment plate 501 drives the heat exchanger 402 to expand upward through the adjustment box 502, thereby increasing the spacing between the heat exchanger 402 itself and increasing the heat dissipation distance between the heat exchanger 402 and the valve stem 3. At this time, in the process of cooling water flowing along the heat exchanger 402, it can The heat that spreads to other parts of the valve stem 3 is exchanged away through the heat exchanger 402, thereby improving the efficiency of cooling and dissipating the heat of the valve stem 3. At the same time, the piston rod 504 is no longer in contact with the pressure plate 604. Under the action of the first elastic member 605, the first elastic member 605 drives the adjustment block 602 to slide along the receiving groove 601 through the pressure plate 604 and the positioning rod 603, so that the adjustment block 602 no longer blocks the connection between the heat exchanger 402 and the receiving groove 601, thereby reducing the flow rate of the coolant flowing from the receiving groove 601 to the heat exchanger 402, thereby facilitating the heat exchange and dissipation of the heat that spreads to other parts of the valve stem 3 through the heat exchanger 402, thereby fully improving the cooling efficiency of the valve stem 3 and facilitating maintaining the normal working state of the valve stem 3.

[0043] In summary, by configuring the guide cylinder 503, the piston rod 504, the adjustment plate 501 and the heat expansion gas 505, not only can the portion of the valve stem 3 closest to the valve body 1 be rapidly heated, but also the heat expansion gas 505 can be used to adjust the valve stem 3 so that the valve stem 3 can be adjusted to the desired position. The piston rod 504 drives the heat exchanger 402 to contract downward through the adjusting plate 501, so that the heat absorption distance of the heat exchanger 402 is reduced. At this time, the heat exchanger 402 quickly cools the part with the highest temperature of the valve stem 3, avoiding the heat from spreading to the part with the low temperature of the valve stem 3. At the same time, during the sliding of the piston rod 504, the adjusting block 602 is driven by the pressing plate 604 and the positioning rod 603 to adjust the flow rate of cooling water flowing to the heat exchanger 402. At this time, by adjusting the flow rate of cooling water, the cooling effect of the heat exchanger 402 on the high-temperature part of the valve stem 3 can be improved again. When the temperature in the valve stem 3 gradually decreases, under the action of the hot expansion gas 505, the adjusting plate 501 drives the heat exchanger 402 to expand upward. At this time, the heat exchange distance between the heat exchanger 402 and the valve stem 3 is increased, which is convenient for absorbing and taking away the residual heat on the valve stem 3, thereby improving the cooling effect of the valve stem 3, further ensuring the normal working state of the valve stem 3, and improving the safety when conveying high-temperature gas.

[0044] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A high temperature resistant valve, comprising a valve body (1) and a valve cover (2), wherein the valve cover (2) is fixedly mounted on the upper end of the valve body (1), characterized in that: A valve stem (3) is slidably connected between the valve body (1) and the valve cover (2), and further comprises: a cooling mechanism (4), the cooling mechanism (4) being arranged in the valve stem (3), the cooling mechanism (4) comprising a cooling groove (401) provided in the valve stem (3), a retractable heat exchanger (402) being arranged in the cooling groove (401), the heat exchanger (402) being used to provide a channel for cooling water to flow; An adjusting mechanism (5), the adjusting mechanism (5) comprising an adjusting plate (501) slidably connected to the cooling groove (401), an end of the adjusting plate (501) close to the heat exchanger (402) being fixedly connected to an adjusting box (502), an end of the heat exchanger (402) close to the adjusting plate (501) being communicated with the adjusting box (502), a guide cylinder (503) being fixedly connected to the bottom of the cooling groove (401), a piston rod (504) being slidably connected inside the guide cylinder (503), a free end of the piston rod (504) being fixedly connected to the adjusting plate (501), a space between the guide cylinder (503) and the piston rod (504) being filled with a heat expansion gas (505) for driving the piston rod (504) to slide in the direction of the valve body (1); A flow rate fine-tuning mechanism (6), wherein the flow rate fine-tuning mechanism (6) is arranged in the guide cylinder (503) and is used to adjust the flow rate of cooling water flowing into the heat exchanger (402).

2. A high temperature resistant valve according to claim 1, characterized in that: The cooling mechanism (4) further comprises a water inlet channel (403) provided in the valve stem (3), one end of the water inlet channel (403) being connected to the flow rate fine-tuning mechanism (6), the other end of the water inlet channel (403) being fixedly connected to a water inlet pipe (404) extending out of the valve stem (3), a water outlet channel (405) being provided in the valve stem (3), one end of the water outlet channel (405) being communicated with the cooling groove (401), the other end of the water outlet channel (405) being fixedly connected to a water outlet pipe (406) extending out of the valve stem (3).

3. A high temperature resistant valve according to claim 2, characterized in that: The regulating mechanism (5) comprises a drainage tube (506) fixedly connected to the regulating plate (501); an end of the drainage tube (506) away from the regulating box (502) extends into the water outlet channel (405) and is slidably connected to the water outlet channel (405); and an end of the drainage tube (506) close to the regulating box (502) is in communication with the regulating box (502).

4. A high temperature resistant valve according to claim 3, characterized in that: The flow rate fine-tuning mechanism (6) comprises a receiving groove (601) provided in the guide cylinder (503); one end of the heat exchanger (402) close to the guide cylinder (503) is connected to the receiving groove (601); an adjusting block (602) is slidably connected in the receiving groove (601); and the adjusting block (602) is capable of blocking a communication port between the heat exchanger (402) and the receiving groove (601).

5. A high temperature resistant valve according to claim 4, characterized in that: One end of the regulating block (602) close to the piston rod (504) is fixedly connected to a positioning rod (603); the free end of the positioning rod (603) extends into the guide cylinder (503) and is fixedly connected to a pressure plate (604); the pressure plate (604) is capable of contacting the piston rod (504); and a first elastic member (605) is sleeved on the positioning rod (603) and is located between the pressure plate (604) and the guide cylinder (503).

6. A high temperature resistant valve according to claim 5, characterized in that: One end of the water inlet channel (403) close to the water inlet pipe (404) is fixedly connected to a filter screen (407).

7. A high temperature resistant valve according to claim 6, characterized in that: A one-way valve (408) is provided at one end of the water inlet channel (403) close to the containing tank (601) for allowing cooling water to flow in one direction from the water inlet channel (403) to the containing tank (601).

8. A high temperature resistant valve according to claim 7, characterized in that: The valve body (1) and the valve cover (2) are both provided with a receiving cavity (7), a sealing material (8) is filled between the receiving cavity (7) and the valve stem (3), and the valve stem (3) is in close contact with the sealing material (8).

9. A high temperature resistant valve according to claim 8, characterized in that: One end of the valve stem (3) close to the valve body (1) is fixedly connected to a valve core (9); a fluid channel (10) is provided in the valve body (1); and the valve core (9) is capable of blocking the fluid channel (10).

10. A high temperature resistant valve according to claim 9, characterized in that: A vertically extending support frame (11) is mounted on the upper end of the valve cover (2), a hydraulic actuator (12) is mounted on the upper end of the support frame (11), and an output end of the hydraulic actuator (12) is fixedly connected to a free end of the valve stem (3) via a coupling (13).

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