Butterfly valve with fireproof function

Abstract

This invention relates to the field of butterfly valve technology, and more particularly to a butterfly valve with fire-resistant function. This invention provides a butterfly valve with fire-resistant function that can more thoroughly seal pipelines in the event of a fire, more effectively preventing the spread of fire and achieving effective fire prevention. A butterfly valve with fire-resistant function includes a valve body, a valve core, and a sealing ring; the valve core is rotatably connected to the inner wall of the valve body, and the sealing ring is fixedly connected to the valve core. In the event of a fire, a temperature sensor detects the temperature and activates an electric actuator to close the valve body, sealing the pipeline and effectively preventing the spread of fire while protecting the valve body from flame damage, thus achieving effective fire prevention.

Description

Technical Field

[0001] This invention relates to the field of butterfly valve technology, and in particular to a butterfly valve with fireproof function. Background Technology

[0002] A butterfly valve, also known as a flap valve, is a simple regulating valve used for on / off control of low-pressure pipeline media. It refers to a valve where the closing element is a disc that rotates around a valve shaft to open and close. Butterfly valves can be used to control the flow of various types of fluids, including air, water, steam, various corrosive media, slurry, oil, liquid metals, and radioactive media. In pipelines, they primarily function as shut-off and throttling devices.

[0003] Existing butterfly valves require manual closure during a fire, which can lead to delays and pose a risk to workers. Furthermore, butterfly valves have poor heat resistance, and if damaged during a fire, they can fail to seal properly, thus failing to effectively prevent the spread of fire, which is extremely unsafe. Summary of the Invention

[0004] In view of the deficiencies in the prior art, the purpose of this invention is to provide a butterfly valve with fireproof function, which can more thoroughly seal the pipeline in the event of a fire, more effectively block the spread of fire, and achieve the purpose of effective fire prevention.

[0005] A fire-resistant butterfly valve includes a valve body, a valve core, a sealing ring, a switching mechanism, and a fire-resistant closing mechanism. The valve core is rotatably connected to the inner wall of the valve body, and the sealing ring is fixedly connected to the valve core. The sealing ring contacts the inner wall of the valve body. The valve body is provided with a switching mechanism and a fire-resistant closing mechanism.

[0006] Furthermore, the switching mechanism includes a rotating shaft, a support plate, a rotating lever, a worm gear, a rotating handle, and a worm. The rotating shaft is rotatably connected to the valve body, and the bottom end of the rotating shaft is fixedly connected to the valve core and a sealing ring. The support plate is fixedly connected to the upper part of the valve body, and the rotating lever is engaged with the top end of the rotating shaft. The support plate is sleeved with the rotating lever, and the worm gear is fixedly connected to the top end of the rotating lever. The rotating handle is rotatably connected to the top of the valve body, and a worm gear is fixedly connected to one end of the rotating handle. The worm gear meshes with the worm gear.

[0007] Furthermore, the fireproof closing mechanism includes an electric push rod, an inclined push rod, a support rod, a round-headed top rod, a ring baffle, a temperature sensor, and a torsion spring. An electric push rod is fixedly connected to the valve body. An inclined push rod is fixedly connected to the telescopic rod of the electric push rod, and the inclined push rod has an inclined surface. A support rod is fixedly connected to the upper part of the valve body. A round-headed top rod is slidably connected to the support rod, and the bottom end of the round-headed top rod contacts the inclined surface of the inclined push rod. A ring baffle is fixedly connected to the outer wall of the rotating lever, and the ring baffle is located above the round-headed top rod. A temperature sensor is fixedly connected to the bottom of the inner wall of the valve body near the rotating handle. The temperature sensor and the electric push rod are electrically connected. A torsion spring connects the rotating shaft to the valve body.

[0008] Furthermore, it also includes a closing and locking mechanism. The closing and locking mechanism is provided on the switching mechanism. The closing and locking mechanism includes a supporting bent rod, a round-headed locking rod, a return spring, and an arc-shaped limiting rod. The supporting bent rod is fixedly connected to the telescopic rod of the electric push rod. The round-headed locking rod is slidably connected to the supporting bent rod. A return spring is connected between the supporting bent rod and the round-headed locking rod. An arc-shaped limiting rod is fixedly connected to the upper part of the rotating shaft. The arc-shaped limiting rod has a circular groove.

[0009] Furthermore, it also includes a fire extinguishing mechanism. The valve body is equipped with a fire extinguishing mechanism, which includes a high-pressure fire extinguishing tank, a curved guide tube, a rotating ball valve, a long push rod, and a semi-circular nozzle. The high-pressure fire extinguishing tank is fixedly connected to the upper part of the valve body. The bottom of the high-pressure fire extinguishing tank is connected to one end of the curved guide tube. The rotating ball valve is rotatably connected to the curved guide tube. One end of the long push rod is fixedly connected to the inclined push rod. The long push rod and the rotating ball valve are located on the same horizontal line. A semi-circular nozzle is fixedly connected to the inner wall of the valve body. The semi-circular nozzle has several spray holes and is connected to the bottom end of the curved guide tube.

[0010] Furthermore, the rotary ball valve has a through hole.

[0011] Furthermore, it also includes a pressure stabilizing mechanism. The valve body is provided with a pressure stabilizing mechanism, which includes a round-headed push rod and a perforated ring. The round-headed push rod is fixedly connected to the inclined push rod, and the perforated ring is rotatably connected to the outer wall of the valve body. The perforated ring has two round holes, and the round-headed push rod is slidably connected to the perforated ring.

[0012] Furthermore, it also includes a fireproof gasket, which is fixedly connected between the valve core and the sealing ring.

[0013] Furthermore, the valve body has two slots and several threaded holes, and the circular holes of the annular ring cooperate with the slots of the valve body to achieve pressure stabilization.

[0014] The beneficial effects are: 1. When a fire occurs, the temperature inside the air intake pipe will rise. At this time, the temperature sensor will activate the electric push rod, so that the rotating rod will no longer block the rotating shaft. The torsion spring will reset and drive the valve core and sealing ring to rotate together, closing the valve body. The carbon dioxide produced by the flame combustion will remain in the external air intake pipe, forming an oxygen-free environment, which will extinguish the flame, thereby effectively blocking the spread of fire. At the same time, it can protect the valve body from being damaged by the flame, thus providing effective fire prevention.

[0015] 2. The electric push rod drives the round-headed locking rod to move, causing the round-headed locking rod to engage in the circular groove of the arc-shaped limiting rod, locking the position of the valve core and sealing ring. This prevents the strong airflow from the flame from causing the valve core and sealing ring to rotate, which would open the valve body and allow the flame to burn the valve body. Consequently, the valve core and sealing ring can more thoroughly block the valve body and seal the air intake pipe, thereby improving the sealing effect of the valve body and effectively enhancing its fire resistance.

[0016] 3. In the event of a fire, the movement of the inclined push rod will push the rotating ball valve to rotate. The rotation of the ball valve will no longer block the curved guide tube, and the high-pressure carbon dioxide gas in the high-pressure fire extinguisher will be evenly sprayed out from several nozzles on the semi-circular nozzle, increasing the concentration of carbon dioxide gas in the valve body and creating an oxygen-free environment more quickly, thus achieving a faster fire extinguishing effect and more effectively improving the fire protection effect of the valve body. Attached Figure Description

[0017] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0018] Figure 2 This is a schematic diagram of the first cross-sectional three-dimensional structure of the present invention.

[0019] Figure 3 For the present invention Figure 2 A magnified three-dimensional structural diagram of A in the middle.

[0020] Figure 4 This is a partial cross-sectional three-dimensional structural diagram of the valve body and orifice ring of the present invention.

[0021] Figure 5 This is a partial three-dimensional structural diagram of the switching mechanism and fireproof closing mechanism of the present invention.

[0022] Figure 6 This is a partially disassembled three-dimensional structural diagram of the switching mechanism and fireproof closing mechanism of the present invention.

[0023] Figure 7 This is a partial three-dimensional structural diagram of the switching mechanism of the present invention.

[0024] Figure 8 This is a schematic diagram of the second cross-sectional three-dimensional structure of the present invention.

[0025] Figure 9 For the present invention Figure 8 A magnified three-dimensional structural diagram of B.

[0026] Figure 10 This is a schematic diagram of the third cross-sectional three-dimensional structure of the present invention.

[0027] Figure 11 This is a partial cross-sectional three-dimensional structural diagram of the switching mechanism and fire extinguishing mechanism of the present invention.

[0028] Figure 12 This is a partial three-dimensional structural diagram of the fire extinguishing mechanism of the present invention.

[0029] Figure 13 This is a partial cross-sectional three-dimensional structural schematic diagram of the fire extinguishing mechanism of the present invention.

[0030] Reference numerals: 1_Valve body, 21_Valve core, 22_Sealing ring, 31_Rotating shaft, 32_Support plate, 33_Rotating lever, 34_Worm gear, 35_Rotating handle, 36_Worm, 41_Electric push rod, 42_Angled push rod, 43_Support rod, 44_Round head push rod, 45_Ring baffle, 46_Temperature sensor, 47_Torsion spring, 51_Support bent rod, 52_Round head lever, 53_Reset spring, 54_Arc surface limit rod, 61_High-pressure fire extinguisher, 62_Bent guide tube, 63_Rotating ball valve, 64_Long push rod, 65_Semi-circular ring nozzle, 71_Round head push rod, 72_Orifice ring, 8_Fireproof washer. Detailed Implementation

[0031] All standard parts used in this invention can be purchased from the market, and irregular parts can be customized according to the description and drawings. The specific connection methods of each part adopt conventional methods such as bolts, rivets, welding, and bonding that are mature in the prior art, and will not be described in detail here.

[0032] Example 1: A butterfly valve with fireproof function, such as Figures 1-7 As shown, the valve includes a valve body 1, a valve core 21, a sealing ring 22, a switching mechanism, and a fireproof closing mechanism. The valve core 21 is rotatably connected to the inner wall of the valve body 1, and the sealing ring 22 is fixedly connected to the valve core 21. The sealing ring 22 is in contact with the inner wall of the valve body 1. The valve body 1 is provided with a switching mechanism and a fireproof closing mechanism.

[0033] The switching mechanism includes a rotating shaft 31, a support plate 32, a rotating lever 33, a worm gear 34, a rotating handle 35, and a worm 36. The rotating shaft 31 is rotatably connected to the valve body 1. The rotating shaft 31 is vertically arranged. The bottom end of the rotating shaft 31 is fixedly connected to the valve core 21 and the bottom end of the rotating shaft 31 is also fixedly connected to the sealing ring 22. The upper part of the valve body 1 is bolted to the support plate 32. The top end of the rotating shaft 31 is clamped to the rotating lever 33. The support plate 32 and the rotating lever 33 are sleeved together. The top end of the rotating lever 33 is fixedly connected to the worm gear 34. The top of the valve body 1 is rotatably connected to the rotating handle 35. One end of the rotating handle 35 is fixedly connected to the worm gear 36. The worm gear 36 is horizontally arranged and meshes with the worm gear 34.

[0034] The fireproof closing mechanism includes an electric push rod 41, an inclined push rod 42, a support rod 43, a round-headed top rod 44, a ring baffle 45, a temperature sensor 46, and a torsion spring 47. The electric push rod 41 is bolted to the valve body 1. The inclined push rod 42 is fixedly connected to the telescopic rod of the electric push rod 41. The inclined push rod 42 is horizontally positioned and has an inclined surface. The upper part of the valve body 1 is bolted to the support rod 43, and a round-headed top rod 44 is slidably connected to the support rod 43. The top rod 44 is vertically arranged with its bottom end in contact with the inclined surface of the inclined push rod 42. A ring baffle 45 is bolted to the outer wall of the rotating clamp 33 and is located above the top rod 44. A temperature sensor 46 is fixedly connected to the bottom of the inner wall of the valve body 1 near the rotating handle 35. The temperature sensor 46 and the electric push rod 41 are electrically connected. A torsion spring 47 is connected between the rotating shaft 31 and the valve body 1 through a hook.

[0035] Initially, the torsion spring 47 is twisted. The operator installs the side of the valve body 1 closest to the temperature sensor 46 onto the external air intake pipe, and the other side of the valve body 1 onto the external exhaust pipe. To close the butterfly valve, the operator first turns the rotating handle 35. Turning the handle 35 rotates the worm gear 36, which in turn rotates the meshing worm wheel 34. The worm wheel 34 rotates the rotating lever 33, which in turn rotates the rotating shaft 31 and the ring baffle 45. The rotating shaft 31 resets the torsion spring 47 and also rotates the valve core 21 and the sealing ring 22. The sealing ring 22 contacts the inner wall of the valve body 1. When valve body 1 is closed, and the butterfly valve needs to operate normally, the operator reverses the rotation handle 35. Reversing the rotation of handle 35 causes the worm gear 36 to rotate in the opposite direction, which in turn causes the meshing worm wheel 34 to rotate in the opposite direction. The worm wheel 34 then causes the rotating lever 33 to rotate in the opposite direction, which in turn causes the rotating shaft 31 and the ring baffle 45 to rotate in the opposite direction. The torsion spring 47 is twisted, and the rotation of the rotating shaft 31 also causes the valve core 21 and the sealing ring 22 to rotate in the opposite direction. The sealing ring 22 no longer blocks the inner wall of valve body 1, allowing the external air intake pipe to connect with the external air exhaust pipe, enabling the gas from the external air intake pipe to pass through the inside of valve body 1. (Temperature sensor...) Temperature sensor 46 detects the temperature of valve body 1. In the event of a fire, the flames will cause the temperature inside the intake pipe to rise. When the temperature rises to a certain level, temperature sensor 46 will activate electric push rod 41. The extension rod of electric push rod 41 will drive inclined push rod 42 to move. The movement of inclined push rod 42 will push round-headed push rod 44 to move upward. The upward movement of round-headed push rod 44 will contact the ring baffle 45 and push the ring baffle 45 to move upward. The upward movement of ring baffle 45 will drive rotating locking rod 33 to move upward. The upward movement of rotating locking rod 33 will drive worm gear 34 to move upward. At the same time, the upward movement of rotating locking rod 33 will disengage from the top of rotating shaft 31. At this time, rotating locking rod 33 will no longer lock the rotation. When shaft 31 and torsion spring 47 reset, the rotating shaft 31 will rotate. The rotation of the rotating shaft 31 will cause valve core 21 and sealing ring 22 to rotate together. The rotation of sealing ring 22 will block valve body 1 again, separating the gas in the external air intake pipe from the external air exhaust pipe. Since the external air intake pipe is sealed, the carbon dioxide produced by the flame combustion will remain in the external air intake pipe, creating an oxygen-free environment inside the external air intake pipe, which will extinguish the flame and effectively prevent the spread of fire. At the same time, it will protect valve body 1 from damage by the flame, so that valve body 1 can effectively prevent fire. After the flame is extinguished, the staff will remove the scorched valve body 1 and install a new valve body 1 between the external air intake pipe and the exhaust pipe.

[0036] Example 2: Based on Example 1, such as Figures 2-9As shown, it also includes a closing and locking mechanism. The closing and locking mechanism is provided on the switch mechanism. The closing and locking mechanism includes a support bent rod 51, a round-headed locking rod 52, a return spring 53, and an arc-shaped limiting rod 54. The support bent rod 51 is connected to the telescopic rod of the electric push rod 41 by screws. The round-headed locking rod 52 is slidably connected to the support bent rod 51. The return spring 53 is connected between the support bent rod 51 and the round-headed locking rod 52 by hooks. The upper part of the rotating shaft 31 is connected to the arc-shaped limiting rod 54 by rivets. The arc-shaped limiting rod 54 has a circular groove.

[0037] When a flame enters the intake pipe, the extension rod of the electric push rod 41 extends, causing the support bent rod 51 to move closer to the rotating shaft 31. The movement of the support bent rod 51 causes the round-headed locking rod 52 to move via the return spring 53. The round-headed locking rod 52 then contacts the arc-shaped limiting rod 54. As the round-headed locking rod 52 continues to move, it is squeezed by the arc-shaped limiting rod 54, stretching the return spring 53. At this time, the rotation of the rotating shaft 31 causes the arc-shaped limiting rod 54 to rotate. When the circular groove of the arc-shaped limiting rod 54 rotates to the point where the round-headed locking rod 52 is located, the return spring 53 returns to its original position. The round-headed locking rod 52 will engage with the circular groove of the arc-shaped limiting rod 54. The round-headed locking rod 52 will limit the arc-shaped limiting rod 54, thereby locking the position of the valve core 21 and the sealing ring 22. This prevents the strong airflow impact from the flame from causing the valve core 21 and the sealing ring 22 to rotate, which would open the valve body 1 and cause the flame to burn the valve body 1. This allows the valve core 21 and the sealing ring 22 to more stably block the valve body 1 and seal the air intake pipe, thereby improving the sealing effect of the valve body 1 and effectively improving the fire resistance of the valve body 1.

[0038] Example 3: Based on Example 2, such as Figures 2-13 As shown, it also includes a fire extinguishing mechanism. The valve body 1 is equipped with a fire extinguishing mechanism, which includes a high-pressure fire extinguishing tank 61, a bent conduit 62, a rotating ball valve 63, a long push rod 64, and a semi-circular nozzle 65. The high-pressure fire extinguishing tank 61 is bolted to the upper part of the valve body 1. One end of the bent conduit 62 is connected to the bottom of the high-pressure fire extinguishing tank 61. The rotating ball valve 63 is rotatably connected to the bent conduit 62. One end of the long push rod 64 is fixedly connected to the inclined push rod 42. The long push rod 64 is horizontally set and is located on the same horizontal line as the rotating ball valve 63. The semi-circular nozzle 65 is fixedly connected to the inner wall of the valve body 1. The semi-circular nozzle 65 has several spray holes and is connected to the bottom end of the bent conduit 62.

[0039] The rotary ball valve 63 has a through hole.

[0040] Initially, the high-pressure fire extinguishing canister 61 is filled with compressed carbon dioxide gas. At this time, the rotating ball valve 63 blocks the curved conduit 62. When flames enter the air inlet pipe, the inclined push rod 42 moves, which drives the long push rod 64 to move. The long push rod 64 contacts the rotating ball valve 63 and pushes the rotating ball valve 63 to rotate. The rotation of the rotating ball valve 63 will no longer block the curved conduit 62, and the high-pressure carbon dioxide gas in the high-pressure fire extinguishing canister 61 will enter the semi-circular annular nozzle 65 through the through hole of the rotating ball valve 63, and be evenly sprayed out through several nozzles on the semi-circular annular nozzle 65, increasing the concentration of carbon dioxide gas in the valve body 1 and accelerating the formation of fire.

[0041] This creates an oxygen-free environment, resulting in faster fire extinguishing and thus more effectively improving the fire resistance of valve body 1.

[0042] Example 4: Based on Example 3, such as Figures 2-10 As shown, it also includes a pressure stabilizing mechanism. The valve body 1 is provided with a pressure stabilizing mechanism, which includes a round-headed push rod 71 and a perforated ring 72. The round-headed push rod 71 is fixedly connected to the inclined push rod 42. The perforated ring 72 is rotatably connected to the outer wall of the valve body 1. The perforated ring 72 has two round holes. The round-headed push rod 71 is slidably connected to the perforated ring 72.

[0043] Initially, the perforated ring 72 blocks the two slots on the valve body 1. When a flame enters the air intake pipe, the movement of the inclined push rod 42 will drive the round-headed push rod 71 to move. The movement of the round-headed push rod 71 will push the perforated ring 72 to rotate. When the two round holes on 72 coincide with the two slots on the valve body 1, the perforated ring 72 will no longer block the two round holes on the valve body 1, so that the interior of the valve body 1 is connected to the perforated ring 72. Since the flame will increase the pressure inside the valve body 1, venting the valve body 1 can prevent the butterfly valve from being damaged due to excessive internal pressure, thus reducing the fireproof effect and allowing the butterfly valve to be better fireproof.

[0044] Example 5: Based on Example 4, such as Figures 7-8 As shown, it also includes a fireproof gasket 8. The fireproof gasket 8 is fixedly connected between the valve core 21 and the sealing ring 22. The valve body 1 has two slots and several screw holes. The round hole of the hole ring 72 cooperates with the slot of the valve body 1 to achieve pressure stabilization.

[0045] The rotation of valve core 21 and sealing ring 22 will drive the fireproof washer 8 to rotate. The fireproof washer 8 can prevent the flame from contacting the sealing ring 22 and prevent the flame from burning the sealing ring 22, thus preventing the sealing ring 22 from being damaged. This allows the sealing ring 22 to seal the valve body 1 more effectively. The round hole of the perforated ring 72 cooperates with the slot of the valve body 1 to achieve pressure stabilization.

[0046] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of this invention is defined by the appended claims and their equivalents.

Claims

1. A butterfly valve with fireproof function, characterized in that: It includes a valve body (1), a valve core (21), a sealing ring (22), a switching mechanism, and a fireproof closing mechanism. The valve core (21) is rotatably connected to the inner wall of the valve body (1), and the sealing ring (22) is fixedly connected to the valve core (21). The sealing ring (22) is in contact with the inner wall of the valve body (1). The valve body (1) is provided with a switching mechanism and a fireproof closing mechanism. The switching mechanism includes a rotating shaft (31), a support plate (32), a rotating lever (33), a worm gear (34), a rotating handle (35), and a worm (36). The rotating shaft (31) is rotatably connected to the valve body (1). The bottom end of the rotating shaft (31) is fixedly connected to the valve core (21), and the bottom end of the rotating shaft (31) is also fixedly connected to the sealing ring (22). The support plate (32) is fixedly connected to the upper part of the valve body (1). The rotating lever (33) is snapped onto the top end of the rotating shaft (31). The support plate (32) is sleeved with the rotating lever (33), and the top end of the rotating lever (33) is fixedly connected to... The valve body (1) has a worm gear (34), and a rotating handle (35) is rotatably connected to the top of the valve body (1). One end of the rotating handle (35) is fixedly connected to a worm (36), which meshes with the worm gear (34). The fireproof closing mechanism includes an electric push rod (41), an inclined push rod (42), a support rod (43), a round-headed top rod (44), a ring baffle (45), a temperature sensor (46), and a torsion spring (47). The electric push rod (41) is fixedly connected to the valve body (1), and an inclined push rod (42) is fixedly connected to the telescopic rod of the electric push rod (41). The inclined push rod (42) is provided with an inclined... On the valve body (1), a support rod (43) is fixedly connected to the upper part, and a round-headed push rod (44) is slidably connected to the support rod (43). The bottom end of the round-headed push rod (44) contacts the inclined surface of the inclined push rod (42). A ring baffle (45) is fixedly connected to the outer wall of the rotating clamp (33). The ring baffle (45) is located above the round-headed push rod (44). A temperature sensor (46) is fixedly connected to the bottom of the inner wall of the valve body (1) near the rotating handle (35). The temperature sensor (46) and the electric push rod (41) are electrically connected. A torsion bar is connected between the rotating shaft (31) and the valve body (1). Force spring (47); also includes a closing locking mechanism, the switch mechanism is provided with a closing locking mechanism, the closing locking mechanism includes a support bent rod (51), a round head locking rod (52), a return spring (53) and an arc surface limiting rod (54), the telescopic rod of the electric push rod (41) is fixedly connected to the support bent rod (51), the round head locking rod (52) is slidably connected to the support bent rod (51), the return spring (53) is connected between the support bent rod (51) and the round head locking rod (52), the upper part of the rotating shaft (31) is fixedly connected to the arc surface limiting rod (54), the arc surface limiting rod (54) has a circular groove;It also includes a fire extinguishing mechanism. The valve body (1) is equipped with a fire extinguishing mechanism, which includes a high-pressure fire extinguishing tank (61), a curved guide tube (62), a rotating ball valve (63), a long push rod (64), and a semi-circular nozzle (65). The high-pressure fire extinguishing tank (61) is fixedly connected to the upper part of the valve body (1). The bottom of the high-pressure fire extinguishing tank (61) is connected to one end of the curved guide tube (62). The curved guide tube (62) is rotatably connected to the rotating ball valve (63). One end of the long push rod (64) is fixedly connected to the inclined push rod (42). The long push rod (64) and the rotating ball valve (63) are located on the same horizontal line. The semi-circular nozzle (65) is fixedly connected to the inner wall of the valve body (1). The semi-circular nozzle (65) has several spray holes. The bottom end of the pipe (65) is connected to the bent conduit (62); the rotating ball valve (63) has a through hole; it also includes a pressure stabilizing mechanism, the valve body (1) is provided with a pressure stabilizing mechanism, the pressure stabilizing mechanism includes a round-headed push rod (71) and a perforated ring (72), the round-headed push rod (71) is fixedly connected to the inclined push rod (42), the perforated ring (72) is rotatably connected to the outer wall of the valve body (1), the perforated ring (72) has two round holes, the round-headed push rod (71) and the perforated ring (72) are slidably connected; it also includes a fireproof gasket (8), the fireproof gasket (8) is fixedly connected between the valve core (21) and the sealing ring (22), the valve body (1) has two slots and several screw holes, the round holes of the perforated ring (72) cooperate with the slots of the valve body (1) to achieve pressure stabilization.

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