A safety ball valve

Abstract

The present invention relates to a safety ball valve, comprising: a valve body, which is provided with a first flow channel and a second flow channel; a valve ball, which is rotatably arranged in the valve body and is provided with a through hole, and the rotation of the valve ball can make the through hole connect the first flow channel and the second flow channel, thereby controlling the opening and closing of the ball valve; a valve stem, one end of which is fixedly connected to the valve ball; a handle, which is fixedly connected to the other end of the valve stem, and rotating the handle can drive the valve stem to rotate, thereby driving the valve ball to rotate; a control mechanism, which is arranged in the valve body and can automatically close the ball valve when the temperature in the valve body exceeds a preset value. The advantages of the present invention are: a sliding baffle is provided, so that in the event of a fire, the valve ball through hole can be isolated by controlling the sliding baffle, so that the ball valve can be closed and the pipeline can be cut off, and the structure is simple, fast and effective.

Description

Technical Field

[0001] The invention relates to the technical field of ball valves, and in particular to a safety ball valve. Background Art

[0002] The ball valve is a particularly widely used valve. Due to the characteristics of reliable sealing, relative stability, long service life, and non-wear, the ball valve is often used in the system to control the on-off of the pipeline when transporting some flammable and explosive media. However, when transporting flammable media, if a fire occurs in the environment where the ball valve is located, the transportation pipeline needs to be quickly cut off to avoid a larger-scale disaster. Since the burning material at the fire scene is unknown, it is more dangerous to use an electric ball valve, and under high temperature conditions, the electric control actuator is easily damaged, so the operator cannot remotely control the ball valve to close through electric control. At the same time, due to the fire at the scene, the operator cannot manually control the ball valve at the scene, so it is necessary to invent a ball valve that can automatically cut off the pipeline at the fire scene. Summary of the invention

[0003] Based on this, it is necessary to provide a safety ball valve to address the above problems.

[0004] The present invention discloses a safety ball valve, which comprises: a valve body, in which a first flow channel and a second flow channel are provided; a valve ball, which is rotatably arranged in the valve body, and in which a through hole is provided, and the rotation of the valve ball can make the through hole connect the first flow channel and the second flow channel, thereby controlling the opening and closing of the ball valve; a valve stem, one end of which is fixedly connected to the valve ball; a handle, which is fixedly connected to the other end of the valve stem, and rotating the handle can drive the valve stem to rotate, thereby driving the valve ball to rotate; a control mechanism, which is arranged in the valve body and can automatically close the ball valve when the temperature in the valve body exceeds a preset value.

[0005] In one embodiment, the control mechanism includes a sliding baffle and a turntable. A track groove is opened in the valve ball. The turntable is rotatably arranged in the valve ball. The baffle is rotatably arranged in the track groove and is fixedly connected to the turntable. The rotation of the turntable can drive the sliding baffle to rotate along the track groove to isolate the through hole.

[0006] In one embodiment, the control mechanism also includes a rotating shaft and a torsion spring. The rotating shaft is rotatably disposed in the valve ball and fixedly connected to the turntable. The torsion spring is disposed in the valve ball and abuts against the valve ball and the rotating shaft at the same time. The torsion spring can drive the rotating shaft to rotate, thereby driving the turntable to rotate.

[0007] In one of the embodiments, a third flow channel is further provided in the valve ball, and two ends of the third flow channel are respectively connected to two ends of the track groove, so that the pressure on both sides of the sliding baffle is equal, and no deflection occurs when the sliding baffle blocks the through hole.

[0008] In one embodiment, the control mechanism also includes a positioning pin and a second spring, the positioning pin is slidably arranged in the valve ball, the second spring is arranged in the valve ball and abuts against the valve ball and the positioning pin at the same time, a pin is provided on the top of the positioning pin, and a positioning hole is opened on the turntable. Under the action of the second spring, the pin can enter the positioning hole to fix the turntable, and when the positioning pin overcomes the second spring and slides downward, the pin can withdraw from the positioning hole to unlock the turntable.

[0009] In one embodiment, the control mechanism also includes an arc track block, a bimetallic strip and a first spring. The arc track block is slidably disposed in the valve body and connected to the positioning pin. A cavity is provided in the valve body. The bimetallic strip is slidably disposed in the cavity. The bimetallic strip simultaneously abuts against the bottom end of the arc track block and the upper wall of the cavity. The first spring simultaneously abuts against the valve body and the arc track block. The bimetallic strip is elongated by heat and can drive the arc track block to overcome the first spring and move downward, thereby driving the positioning pin to overcome the second spring and move downward.

[0010] In one embodiment, the control mechanism also includes a swing rod, a fan-shaped groove is opened on the valve body, and a first side wall and a second side wall are provided on the edge of the fan-shaped groove. The swing rod is fixedly connected to the bottom of the rotating shaft and the swing rod is rotatably arranged in the fan-shaped groove. When the ball valve needs to be closed, the rotation of the rotating shaft can drive the swing rod to rotate along the fan groove from the first side wall to fit with the second side wall so that the turntable is turned. When a fire occurs, the torsion spring can drive the rotating shaft to rotate, and then drive the sliding baffle to rotate to close the through hole. When the fire is over, rotating the handle counterclockwise can drive the valve ball to rotate counterclockwise. Since the swing rod touches the second side wall, the turntable does not rotate with the valve ball.

[0011] In one of the embodiments, an arc track is provided at the upper end of the arc track block, and a hook is provided at the bottom of the positioning pin. The hook is slidably connected to the arc track block. The rotation of the valve ball can drive the positioning pin to rotate, thereby driving the hook to slide in the arc track and slide out of the arc track. At the same time, under the push of the second spring, the positioning pin can rise and push the pin into the positioning hole to re-lock the turntable. When the bimetallic strip cools down and restores its original length, under the action of the first spring, the arc track block can rise, and the rotation of the valve ball can enable the hook to re-enter the arc track to complete the reset.

[0012] In one embodiment, the valve body includes a left valve body and a right valve body, and the left valve body and the right valve body are fixedly connected.

[0013] In one embodiment, the valve ball includes a first sphere and a second sphere, and the first sphere and the second sphere are fixedly connected.

[0014] The advantages of the present invention are:

[0015] 1. By setting a sliding baffle in the valve ball, when a fire occurs, the ball valve can be closed by controlling the sliding baffle to block the valve ball through hole, thus completing the pipeline cut-off. The structure is simple, fast and effective;

[0016] 2. The torsion spring is set to drive the turntable to rotate, and then drive the sliding baffle to slide. At the same time, the positioning pin is set to position the turntable, so that when the positioning pin positions the turntable, the sliding baffle shrinks and the ball valve through hole is in a passage state. When the positioning pin releases the turntable lock, the turntable is driven to rotate under the action of the torsion spring, and then the sliding baffle is driven to slide, thereby isolating the valve ball through hole. It is simple and fast, and the control is simple;

[0017] 3. By arranging the arc track block and arranging the bimetallic strip and the first spring to cooperate, when encountering a fire situation, the temperature around the ball valve rises, the bimetallic strip is deformed by heat, and the arc track block is driven to overcome the first spring to pull the positioning pin to move, release the positioning of the turntable, and then the sliding baffle is automatically closed, so that the ball valve can complete the automatic closing function in the event of a fire;

[0018] 4. By providing a fan-shaped groove on the valve body and a swing rod in the fan-shaped groove, when the ball valve automatically completes the closing work, the turntable drives the sliding baffle to rotate, and at the same time drives the swing rod to rotate from one side position in the fan-shaped groove to the other side position. After the fire is over, the worker manually turns the handle to drive the valve ball to rotate. However, since the swing rod is in the fan-shaped groove, the swing rod cannot rotate with the valve ball, and the turntable cannot rotate either, so that the valve ball and the sliding baffle rotate relative to each other until the sliding baffle is retracted and the positioning pin repositions the turntable. At this time, the valve ball is in the closed position, and the sliding baffle is retracted to make the valve ball through hole unblocked, completing the return of the ball valve, so that the ball valve can automatically return after a fire. When a fire occurs again, the ball valve can still complete automatic closing again. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a cross-sectional view of the present invention;

[0020] Figure 2 For the present invention Figure 1 Section view in the AA direction;

[0021] Figure 3 For the present invention Figure 1 Cross-sectional view in the BB direction;

[0022] Figure 4 For the present invention Figure 1 Cross-sectional view in CC direction;

[0023] Figure 5 For the present invention Figure 1 The enlarged image at point I in the middle;

[0024] Figure 6 It is a three-dimensional view of the positioning pin and the arc track block of the present invention when they are matched.

[0025] In the figure, valve ball 1, first sphere 11, second sphere 12, through hole 111, track groove 112, third flow channel 113, valve body 2, right valve body 21, fan-shaped groove 211, first side wall 2111, second side wall 2112, first flow channel 212, left valve body 22, second flow channel 221, handle 4, valve stem 3, bimetallic strip 82, first spring 83, arc track block 81, arc track 811, locating pin 71, hook 712, pin 711, second spring 72, turntable 62, locating hole 621, rotating shaft 63, torsion spring 65, swing rod 64, sliding baffle 61. DETAILED DESCRIPTION

[0026] 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.

[0027] It should be noted that when a component is referred to as being "mounted on" another component, it may be directly on the other component or there may be a central component. When a component is considered to be "set on" another component, it may be directly set on the other component or there may be a central component at the same time. When a component is considered to be "fixed to" another component, it may be directly fixed on the other component or there may be a central component at the same time.

[0028] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which the present invention belongs. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "or / and" used herein includes any and all combinations of one or more of the related listed items.

[0029] The present invention discloses a safety ball valve, such as Figure 1 As shown, the safety ball valve comprises: a valve body 2, in which a first flow channel 212 and a second flow channel 221 are provided; a valve ball 1, in which the valve ball 1 is rotatably arranged in the valve body 2, in which a through hole 111 is provided, and the rotation of the valve ball 1 can make the through hole 111 connect the first flow channel 212 and the second flow channel 221, thereby controlling the opening and closing of the ball valve; a valve stem 3, in which one end of the valve stem 3 is fixedly connected to the valve ball 1; a handle 4, in which the handle 4 is fixedly connected to the other end of the valve stem 3, and rotating the handle 4 can drive the valve stem 3 to rotate, thereby driving the valve ball 1 to rotate; a control mechanism, in which the control mechanism is arranged in the valve body 2, and can automatically close the ball valve when the temperature in the valve body exceeds a preset value.

[0030] It is worth mentioning that when a fire occurs, the temperature will be higher than a preset value. In this embodiment, the preset value is 100 degrees Celsius.

[0031] Preferably, the control mechanism includes a sliding baffle 61 and a turntable 62. A track groove 112 is opened in the valve ball 1. The turntable 62 is rotatably set in the valve ball 1. The baffle is rotatably set in the track groove 112 and is fixedly connected to the turntable 62. The rotation of the turntable 62 can drive the sliding baffle 61 to rotate along the track groove 112 to isolate the through hole 111.

[0032] Preferably, the control mechanism also includes a rotating shaft 63 and a torsion spring 65. The rotating shaft 63 is rotatably arranged in the valve ball 1 and is fixedly connected to the turntable 62. The torsion spring 65 is arranged in the valve ball 1 and abuts against the valve ball 1 and the rotating shaft 63 at the same time. The torsion spring 65 can drive the rotating shaft 63 to rotate, thereby driving the turntable 62 to rotate.

[0033] Preferably, a third flow channel 113 is further provided in the valve ball 1 , and two ends of the third flow channel 113 are respectively connected to two ends of the track groove 112 , so that the pressure on both sides of the sliding baffle 61 is equal, and no deflection occurs when the sliding baffle 61 blocks the through hole 111 .

[0034] Preferably, the control mechanism also includes a positioning pin 71 and a second spring 72, the positioning pin 71 is slidably arranged in the valve ball 1, the second spring 72 is arranged in the valve ball 1 and abuts against the valve ball 1 and the positioning pin 71 at the same time, a pin 711 is provided on the top of the positioning pin 71, and a positioning hole 621 is opened on the turntable 62. Under the action of the second spring 72, the pin 711 can enter the positioning hole 621 to fix the turntable 62, and when the positioning pin 71 overcomes the second spring 72 and slides downward, the pin 711 can withdraw from the positioning hole 621, thereby unlocking the turntable 62.

[0035] It can be understood that, by setting the positioning pin 71 and the rotating shaft 63, when the pin 711 enters the positioning hole 621 to fix the turntable 62, the turntable 62 cannot rotate relative to the valve ball 1. When the positioning pin 71 unlocks the turntable 62, the rotating shaft 63 drives the turntable 62 to rotate relative to the valve ball 1 under the action of the torsion spring 65, thereby driving the sliding baffle 61 to isolate the through hole 111.

[0036] Preferably, the control mechanism also includes an arc track block 81, a bimetallic strip 82 and a first spring 83. The arc track block 81 is slidably disposed in the right valve body 21 and is connected to the positioning pin 71. A cavity is opened in the right valve body 21. The bimetallic strip 82 is slidably disposed in the cavity. The bimetallic strip 82 simultaneously abuts against the bottom end of the arc track block 81 and the upper wall of the cavity. The first spring 83 simultaneously abuts against the right valve body 21 and the arc track block 81. The bimetallic strip 82 is elongated by heat and can drive the arc track block 81 to overcome the first spring 83 and move downward, thereby driving the positioning pin 71 to overcome the second spring 72 and move downward.

[0037] It is understandable that by providing a bimetallic strip 82 to sense ambient temperature changes, the bimetallic strip 82 is heated and stretched to drive the positioning pin 71 to move, thereby achieving automatic unlocking in the event of a fire. When the surrounding environment cools down, the bimetallic strip 82 can return to its original length.

[0038] Preferably, the control mechanism also includes a swing rod 64, a fan-shaped groove 211 is opened on the right valve body 21, and the edge of the fan-shaped groove 211 is provided with a first side wall 2111 and a second side wall 2112, the swing rod 64 is fixedly connected to the bottom of the rotating shaft 63 and the swing rod 64 is rotatably set in the fan-shaped groove 211, when the ball valve needs to be closed, the rotation of the rotating shaft 63 can drive the swing rod 64 to rotate along the fan-shaped groove 211 from the first side wall 2111 to fit with the second side wall 2112, when a fire occurs, the torsion spring 65 can drive the rotating shaft 63 to rotate, and then drive the sliding baffle 61 to rotate to close the through hole 111, when the fire is over, rotating the handle 4 counterclockwise can drive the valve ball 1 to rotate counterclockwise, because the swing rod 64 and the second side wall 2112 touch, the turntable 62 does not rotate with the valve ball 1.

[0039] It can be understood that, by arranging the swing rod 64 and the fan-shaped groove 211 to cooperate, the valve ball 1 can be driven to rotate by manually turning the handle 4 after a fire. However, since the swing rod 64 is in contact with the second side wall 2112, the swing rod 64 cannot rotate with the valve ball 1, and the turntable 62 cannot rotate either, so that the valve ball 1 and the sliding baffle 61 rotate relative to each other until the sliding baffle 61 is retracted and the positioning pin 71 repositions the turntable 62. At this time, the ball valve is in a closed state.

[0040] Preferably, an arc track 811 is provided at the upper end of the arc track block 81, and a hook 712 is provided at the bottom of the positioning pin 71. The hook 712 is slidably connected to the arc track block 81. The rotation of the valve ball 1 can drive the positioning pin 71 to rotate, thereby driving the hook 712 to slide in the arc track 811 and slide out of the arc track 811. At the same time, under the push of the second spring 72, the positioning pin 71 can rise and push the pin 711 into the positioning hole 621 to re-lock the turntable 62. When the bimetallic strip 82 cools down and restores its original length, under the action of the first spring 83, the arc track block 81 can rise, and the rotation of the valve ball 1 can make the hook 712 enter the arc track 811 again to complete the reset.

[0041] It is understandable that at this time, due to the rotation of the valve ball 1, the ball valve is opened again, and can still be automatically closed when the next fire occurs.

[0042] Preferably, the valve body 2 includes a left valve body 22 and a right valve body 21 , and the left valve body 22 and the right valve body 21 are fixedly connected.

[0043] Preferably, the valve ball 1 includes a first sphere 11 and a second sphere 12, and the first sphere 11 and the second sphere 12 are fixedly connected.

[0044] The working mode of the present invention is:

[0045] When the present invention is used to transport flammable and explosive media, the present invention must first be connected to a pipeline, such as Figure 1 The position shown is the open state of the present invention. At this time, the through hole 111 connects the first flow channel 212 and the second flow channel 221, the hook 712 enters the arc track 811 to connect the positioning pin 71 with the arc track block 81, and the pin 711 enters the positioning hole 621 to lock the turntable 62. When the ball valve of the present invention needs to be closed, Figure 2 and Figure 3 As shown, the ball valve can be closed by rotating the handle 4 counterclockwise to drive the valve ball 1 to rotate counterclockwise by 90 degrees to block the first flow channel 212 and the second flow channel 221. At this time, the hook 712 is disengaged from the arc track 811, the positioning pin 71 is separated from the arc track block 81, and the pin 711 still locks the turntable 62 in the positioning hole 621. When the ball valve needs to be opened again, the handle 4 is rotated clockwise to drive the valve ball 1 to rotate clockwise by 90 degrees so that the through hole 111 connects the first flow channel 212 and the second flow channel 221 to complete the action.

[0046] like Figure 1 , Figure 4 and Figure 5 and Figure 6As shown, when the ball valve of the present invention is in an open state and a fire occurs in the surrounding environment, the surrounding air temperature rises due to the fire. When the deformation temperature of the bimetallic strip 82 is reached, the total deformation height of the bimetallic strip 82 becomes longer, thereby overcoming the first spring 83 to pull the arc track block 81 downward. Since the hook 712 slides in the arc track 811, when the arc track block 81 moves downward, the positioning pin 71 overcomes the second spring 72 and moves downward, so that the pin 711 withdraws from the positioning hole 621, and the rotating disk 62 is released from the positioning. Under the action of the torsion spring 65, the rotating shaft 6 3 rotates counterclockwise, thereby driving the rotating disk 62 and the swing rod 64 to rotate counterclockwise by 90 degrees, and then the rotating disk 62 drives the sliding baffle 61 to rotate along the track groove 112 to block the through hole 111. Due to the action of the third flow channel 113, the pressure on both sides of the sliding baffle 61 is equal, so that when the through hole 111 is blocked, the forces on both sides are equal and no deflection occurs. At the same time, the swing rod 64 rotates 90 degrees in the fan-shaped groove 211, so that the swing rod 64 and the second side wall 2112 are in contact. At this time, since the sliding baffle 61 blocks the through hole 111, the ball valve automatically completes the closing action.

[0047] like Figure 4 , Figure 5 and Figure 6 As shown, when the fire is over, the handle 4 is turned counterclockwise to drive the valve ball 1 to rotate counterclockwise. Since the swing rod 64 and the second side wall 2112 touch each other at this time, the turntable 62 cannot rotate with the valve ball 1 under the action of the swing rod 64, so that the valve ball 1 overcomes the torsion spring 65 and drives the positioning pin 71 to rotate counterclockwise. When the valve ball 1 rotates 90, the sliding baffle 61 slides along the track groove 112 to make the through hole 111 unblocked. At the same time, since the hook 712 slides out of the arc track 811 and the ambient temperature drops, the bimetallic strip 82 restores its shape and becomes shorter in height. Under the action of the first spring 83, the arc track block 811 is pushed. 1 rises, the pin 711 coincides with the positioning hole 621, and under the action of the second spring 72, the positioning pin 71 is pushed up, the pin 711 enters the positioning hole 621 to reposition the turntable 62, and then the handle 4 is rotated clockwise to drive the valve ball 1 to rotate 90 degrees, so that the hook 712 slides into the arc track 811 again, so that the positioning pin 71 and the arc track block 81 are re-matched, and the through hole 111 is re-connected with the first flow channel 212 and the second flow channel 221, so that the ball valve is reopened, and the ball valve is reopened. When the ball valve is subjected to the high temperature of the fire again, it can still complete the automatic closing action and can be used multiple times.

[0048] like Figure 4 , Figure 5 and Figure 6As shown, when the ball valve of the present invention is in a closed state and a fire occurs in the surrounding environment, since the positioning pin 71 and the arc track block 81 are separated in the closed state, when the temperature rises and the bimetallic strip 82 is deformed, the positioning pin 71 still positions the turntable 62, and the valve ball 1 is in a closed position, so there is no danger; and after the fire is over, the ball valve can be opened by turning the handle 4 clockwise, and the bimetallic strip 82 restores its shape due to the decrease in temperature. The arc track block 81 rises under the action of the second spring 72 and returns to its original position. When the positioning pin 71 rotates with the valve ball 1, the hook 712 slides into the arc track 811, so that the positioning pin 71 and the arc track block 81 cooperate again, which will not affect the operation of the ball valve when it is opened.

[0049] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0050] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A safety ball valve, It is characterized in that The safety ball valve comprises: A valve body, wherein a first flow channel and a second flow channel are formed in the valve body; A valve ball, the valve ball is rotatably disposed in the valve body, a through hole is provided in the valve ball, and the rotation of the valve ball can make the through hole connect the first flow channel and the second flow channel, thereby controlling the opening and closing of the ball valve; A valve stem, one end of which is fixedly connected to the valve ball; A handle, wherein the handle is fixedly connected to the other end of the valve stem, and rotating the handle can drive the valve stem to rotate, thereby driving the valve ball to rotate; A control mechanism, the control mechanism is arranged in the valve body and can automatically close the ball valve when the temperature in the valve body exceeds a preset value; The control mechanism includes a sliding baffle and a rotating disk. A track groove is provided in the valve ball. The rotating disk is rotatably arranged in the valve ball. The baffle is rotatably arranged in the track groove and is fixedly connected to the rotating disk. The rotation of the rotating disk can drive the sliding baffle to rotate along the track groove to block the through hole. The control mechanism further includes a rotating shaft and a torsion spring, wherein the rotating shaft is rotatably disposed in the valve ball and fixedly connected to the rotating disk, and the torsion spring is disposed in the valve ball and abuts against the valve ball and the rotating shaft at the same time, and the torsion spring can drive the rotating shaft to rotate, thereby driving the rotating disk to rotate; The control mechanism further includes a positioning pin and a second spring, wherein the positioning pin is slidably disposed in the valve ball, the second spring is disposed in the valve ball and abuts against the valve ball and the positioning pin at the same time, a pin is disposed on the top of the positioning pin, and a positioning hole is provided on the rotating disk. Under the action of the second spring, the pin can enter the positioning hole to fix the rotating disk, and when the positioning pin overcomes the second spring and slides downward, the pin can exit the positioning hole to unlock the rotating disk; The control mechanism also includes an arc track block, a bimetallic strip and a first spring. The arc track block is slidably disposed in the valve body and connected to the positioning pin. A cavity is provided in the valve body. The bimetallic strip is slidably disposed in the cavity. The bimetallic strip simultaneously abuts against the bottom end of the arc track block and the upper wall of the cavity. The first spring simultaneously abuts against the valve body and the arc track block. The bimetallic strip is elongated by heat and can drive the arc track block to overcome the first spring and move downward, thereby driving the positioning pin to overcome the second spring and move downward.

2. The safety ball valve according to claim 1, It is characterized in that A third flow channel is also provided in the valve ball, and two ends of the third flow channel are respectively connected to two ends of the track groove, so that the pressure on both sides of the sliding baffle is equal, and no deflection occurs when the sliding baffle blocks the through hole.

3. The safety ball valve according to claim 2, It is characterized in that The control mechanism also includes a swing rod, a fan-shaped groove is opened on the valve body, and a first side wall and a second side wall are provided on the edge of the fan-shaped groove. The swing rod is fixedly connected to the bottom of the rotating shaft and the swing rod is rotatably arranged in the fan-shaped groove. When the ball valve needs to be closed, the rotation of the rotating shaft can drive the swing rod to rotate along the fan groove from the first side wall to fit with the second side wall so that the turntable is turned. When a fire occurs, the torsion spring can drive the rotating shaft to rotate, and then drive the sliding baffle to rotate to close the through hole. When the fire is over, rotating the handle counterclockwise can drive the valve ball to rotate counterclockwise. Since the swing rod touches the second side wall, the turntable does not rotate with the valve ball.

4. The safety ball valve according to claim 3, It is characterized in that An arc track is provided at the upper end of the arc track block, and a hook is provided at the bottom of the positioning pin. The hook is slidably connected to the arc track block. The rotation of the valve ball can drive the positioning pin to rotate, thereby driving the hook to slide in the arc track and slide out of the arc track. At the same time, under the push of the second spring, the positioning pin can rise and push the pin into the positioning hole to re-lock the turntable. When the bimetallic strip cools down and recovers its original length, under the action of the first spring, the arc track block can rise, and the rotation of the valve ball can enable the hook to re-enter the arc track to complete the reset.

5. The safety ball valve according to claim 1, It is characterized in that The valve body comprises a left valve body and a right valve body, and the left valve body and the right valve body are fixedly connected.

6. The safety ball valve according to claim 1, It is characterized in that The valve ball includes a first sphere and a second sphere, and the first sphere and the second sphere are fixedly connected.

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