Signal control type synchronous response shut-off valve

Abstract

The invention discloses a signal control type synchronous response shut-off valve, and belongs to the technical field of oil drainage nitrogen injection fire extinguishing shut-off valves of oil immersed transformers. The cutoff valve is controlled by the fire extinguishing signal to synchronously respond to and close with oil discharge and nitrogen injection fire extinguishing; a telescopic electromagnetic lock rod capable of doing axial movement penetrates through an electromagnetic controller in the cutoff valve, the electromagnetic lock rod stretches out to be matched with a movable valve plate to lock the movable valve plate when no signal exists, and mistaken closing caused by the influence of external factors is avoided. After the cutoff valve receives a fire extinguishing signal, the electromagnetic lock rod retracts and is locked with the locking elastic piece, so that the movable valve plate is in a control-off state and responds to be closed at the fire extinguishing moment; when the valve plate of the shut-off valve is closed, the padlock elastic piece on the valve plate is locked with the control drive plate, so that the valve plate is prevented from being repeatedly opened due to impact of reverse oil flow; a variable compression sealing structure is designed at the position where the rotating shaft is out of the shell and matched with a limiting sealing cover so that a rotating shaft sealing ring can be changed into static sealing from dynamic sealing, oil leakage can be kept for a long time, the handle can be kept at the correct position, misoperation is avoided, and running safety is guaranteed.

Description

Technical Field

[0001] The present invention belongs to the technical field of oil-immersed transformer oil-draining nitrogen-injecting fire-extinguishing cut-off valves, and in particular relates to a signal-controlled synchronous response type cut-off valve. Background Art

[0002] The existing cut-off valve belongs to the transformer oil drainage and nitrogen injection fire extinguishing device system, but it is independently installed in the connecting pipe between the oil-immersed transformer and the oil conservator. It is not controlled by the fire extinguishing device but only by the oil flow rate in the connecting pipe. When the fire extinguishing device starts the transformer to drain oil, the cut-off valve automatically closes under the impact of the oil flow, cutting off the oil path between the oil conservator and the transformer, preventing the oil conservator from leaking oil and supporting combustion. The shut-off valves, flow control valves and similar products abroad in operation in my country are not controlled by fire extinguishing devices. This creates a contradiction. They are closed by impact at an oil flow rate of 0.3 to 0.5 m / s. Oil flow rates less than 0.3 m / s should be reserved for normal operation of the transformer, while oil flow rates greater than 0.5 m / s are the most difficult for the shut-off valve to be effectively closed due to the impact of oil flow backlash. Under special circumstances, the transformer often has an oil flow of 0.3 m / s to 0.5 m / s, such as the contraction and jamming of the bellows oil storage cabinet, the return oil flow after the gas relay trips, and the draining and filling of oil during maintenance, which will cause the shut-off valve to be mistakenly closed, causing a lot of trouble for users and making people doubt the transformer oil draining and nitrogen injection fire extinguishing technology. Many users simply put it in a forced open state. Although it avoids the false closure alarm, it is equivalent to abolishing the oil draining and nitrogen injection fire extinguishing device, which brings great hidden dangers to the transformer. This practice has become a common phenomenon among industry users.

[0003] In summary, the main problem is that the existing stop valve is not controlled by the shut-off device. It is not reasonable to rely solely on the oil flow rate impact to close the stop valve. The setting of the closing flow rate range of 0.3-0.5m / s does not exclude the influence of the special situation of the transformer on the stop valve, and the phenomenon of false closing is bound to occur. In addition, there are structural deficiencies in the stop valve. After closing, it cannot resist the impact of the reverse oil flow, causing the valve plate to open repeatedly and fail to achieve effective closure. The shaft must be rotated during installation and adjustment. After commissioning, this seal becomes a dynamic seal. The dynamic seal has a short service life and is prone to oil leakage, which cannot meet the overall sealing requirements of the transformer. Summary of the invention

[0004] In view of the deficiencies in the prior art, the purpose of the present invention is to provide a signal-controlled synchronous response type shut-off valve. First, the oil discharge signal of the fire extinguishing device is connected to the shut-off valve at the same time as the oil discharge valve, so that it is subject to the unified control of the fire extinguishing device and is closed synchronously with the oil discharge and nitrogen injection fire extinguishing, thereby avoiding the accidental closure alarm during the normal operation of the transformer; second, the locking spring on the valve plate and the control dial form a group of locking mechanisms, so that the valve plate will not open due to the impact of the reverse oil flow after closing, thereby achieving one-time effective closure; third, a variable compression sealing structure is added to the rotating shaft, and the rubber ring is in a relaxed state during adjustment. After being put into operation, the rubber ring becomes a static seal to avoid oil leakage.

[0005] The technical solution adopted by the invention is: a synchronous response type shut-off valve controlled by a fire extinguishing signal, including a shell with double-sided windows and a hatch cover covering the shell, a frame installed in the shell, and an active valve plate, an electromagnetic controller and a flow rate setting device are installed on the frame. The technical points are that an inner spacer, a rubber ring and an outer pressure pad are provided on the surface of the shell where the rotating shaft extends out, and the rubber ring is in a relaxed state when the rotating shaft is rotated to adjust the valve plate. After the operation is completed, the handle is placed in the operating position and fixed, and a limit sealing cover for limiting the handle is installed outside the handle. The limit sealing cover is a one-side opening structure, and the opening allows the handle to enter the limit sealing cover. Fixing bolts that fix the limit sealing cover to the shell are also provided above and below the limit sealing cover, respectively. When the handle is restricted from rotating, the pressure pad compresses the rubber ring into a static sealing state to ensure that the rotating shaft is well sealed and does not leak oil.

[0006] In the above scheme, the electromagnetic controller has a group of coils in which a retractable electromagnetic locking rod that can move axially is passed through. When there is no signal input, the electromagnetic locking rod extends out, and the first locking end of the electromagnetic locking rod cooperates with the clamping plate of the active valve plate to lock the active valve plate and keep the active valve plate in the open position; when the signal is input to the coil, the electromagnetic locking rod retracts, and the annular groove on the second locking end of the electromagnetic locking rod cooperates with the locking spring fixed on the bottom plate of the electromagnetic controller housing. After the locking spring enters the groove, it locks the locking rod to prevent the locking rod from popping out and re-locking the active valve plate when the magnetism of the coil disappears after the signal stops. The active valve plate can run to the closed position with the impact of the oil flow generated by the hysteresis, ensuring that the shut-off valve is opened when the transformer is operating normally and closed when a fire occurs.

[0007] In the above scheme, the electromagnetic locking rod is reset by a pressure plate, and the pressure plate is fixed on the top of the electromagnetic controller housing. The reset spring sheet with the front end raised connected to the back of the pressure plate provides an upward rebound force for the pressure plate. The pressing contact finger of the pressure plate overlaps the locking spring sheet located at the bottom of the electromagnetic controller housing. The locking spring sheet is pressed downward to disengage from the slot, and the electromagnetic locking rod is unlocked and pops out.

[0008] In the above scheme, above the pressure plate is a probe arranged in the left compartment of the hatch cover, and the probe provides downward pressing force for the pressure plate.

[0009] In the above solution, a first reed switch and a second reed switch are symmetrically arranged on the stand. When the valve plate is in the operating position, the first reed switch and the second reed switch are always in an open state.

[0010] In the above scheme, a locking spring piece is also connected to the active valve plate for locking the control dial when closed. Before closing, the front end of the locking spring piece first contacts the outer arc surface of the control dial and bends upward as the closing angle becomes smaller. After passing through the top hook, the spring piece becomes straight and locks with the hook on the inner arc surface of the control dial.

[0011] In the above scheme, the outer arc surface protruding from the fan-shaped vertical edge of the control dial serves as the contact surface for opening the valve plate, and serves as the guiding sliding surface for the locking spring when the valve plate is closed. The inner arc protruding from the fan-shaped vertical edge of the control dial serves as the locking hook of the locking spring, and the forward U-shaped groove of the fan-shaped horizontal edge serves as the guide groove of the lever when the control valve plate is closed.

[0012] The beneficial effects of the present invention are as follows: the signal-controlled synchronous response type shut-off valve, the coil in the electromagnetic controller and the electromagnetic lock rod that is retractable and moves axially are passed through. When there is no signal input, the electromagnetic lock rod extends, and the first locking end of the electromagnetic lock rod cooperates with the clamping plate of the active valve plate to lock the active valve plate and keep the active valve plate in the open position; when the fire extinguishing signal is received, the coil generates a magnetic electromagnetic lock rod that retracts, and the annular groove at the second locking end of the electromagnetic lock rod cooperates with the locking spring piece fixed on the bottom plate of the electromagnetic controller housing. After the locking spring piece enters the groove, it locks the lock rod, so that the active valve plate is in a de-controlled state and can be closed under the impact of the oil flow formed by the hysteresis. This structure ensures that the shut-off valve is controlled (locked) by the electromagnetic controller when the transformer is operating normally, and the active valve plate is in a forced open state, and will not be affected by vibration, tripping and unexpected strong oil flow to cause mistaken closure, so that the transformer can operate more safely and stably.

[0013] The manual control mechanism composed of the limit seal cover, handle, shaft and control dial has the following uses: first, the valve plate state can be adjusted; second, the control dial can be locked with the closed valve plate when in the operating position; third, the limit seal cover limits the rotation of the shaft and converts the rubber ring into a static seal. The first seal inside the shaft through the shell is a dynamic seal composed of a shaft clamp ring, a spacer, a rubber ring, and a threaded sleeve. The second seal added on the surface of the shell is a variable compression seal composed of a spacer, a rubber ring, and a pressure pad. After the limit seal cover is tightened, the shaft is statically sealed, which can maintain oil leakage for a long time, and can also keep the handle in the correct position, so that the shut-off valve will not be used incorrectly. When the shaft is rotated again, the limit seal cover must be removed first to release the pressure of the second seal ring to prevent it from being worn. After the operation is completed, the limit seal cover is tightened and the seal ring becomes a static seal again, so that the seal of the shaft is strengthened and the seal ring is easy to replace.

[0014] The locking spring on the active valve plate forms a locking relationship with the control dial to prevent the valve plate from opening again under the impact of reverse oil flow after closing. When the valve plate is reset, the locking relationship with the rotating control dial is automatically released without affecting the opening of the valve plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0016] Figure 1 It is a schematic diagram of the structure of a signal-controlled synchronous response type stop valve in an embodiment of the present invention; Figure 2 This is a schematic diagram of the structure of an electromagnetic controller in an embodiment of the present invention; Figure 3 Schematic diagram of the electromagnetic lock rod popping out state in an embodiment of the present invention; Figure 4 Schematic diagram of the electromagnetic lock rod retracted state in the embodiment of the present invention Figure 5 Schematic diagram of the first seal, second seal, and limit seal cover structure in an embodiment of the present invention Figure 6 It is a schematic diagram of the working position of the movable valve plate in the embodiment of the present invention; Figure 7 This is a schematic diagram of a handle in a forced opening position according to an embodiment of the present invention; Figure 8 This is a schematic diagram of a handle in a normal operating position according to an embodiment of the present invention; Fig. 9 This is a schematic diagram of a handle in a forced closing position according to an embodiment of the present invention; Fig.10 This is a schematic diagram of the handle in the closed locking position according to an embodiment of the present invention; The serial numbers in the figure are explained as follows: 1 housing, 2 frame, 3 active valve plate, 4 electromagnetic controller, 41 pressure plate, 42 reset spring, 5 first reed switch, 6 hatch, 7 probe, 8 tension spring, 9 terminal, 10 shaft, 11 rubber ring, 12 bolt, 13 pressure pad, 14 limit sealing cover, 15 handle, 16 first connecting arm, 17 inner spacer, 18 electromagnetic locking rod, 19 locking spring, 20 control dial, 20-1 outer arc surface, 20-2 inner arc, 21 lever. DETAILED DESCRIPTION

[0017] To make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the following is a brief description of the present invention in conjunction with the attached Figure 1-Figure 10The present invention is further described in detail with reference to the accompanying drawings and specific embodiments.

[0018] The signal-controlled synchronous response type shut-off valve of this embodiment includes a shell 1 with a visual window and a detachable hatch cover 6 covering the shell 1. A frame 2 is installed in the shell 1, and an active valve plate 3 and an electromagnetic controller 4 are connected to the frame 2. A probe 7 is provided in the left compartment of the hatch cover 6, and the probe 7 is inserted into the shell 1. A terminal 9 for connecting an alarm signal line and a fire extinguishing signal line is provided in the right compartment of the hatch cover 6.

[0019] This embodiment uses the electromagnetic controller 4 to control the posture of the active valve plate 3. The electromagnetic controller has a 24V DC coil inside. The DC coil has a locking rod telescopic mechanism and an electromagnetic locking rod 18 that can move axially along the center of the DC coil. When the power is off, the electromagnetic locking rod is in a pop-up state, which has a locking effect on the active valve plate 3. When the power is on, the electromagnetic locking rod 18 retracts to release the locking of the active valve plate 3. The specific structure is: the electromagnetic controller 4 is encapsulated in the shell, and the electromagnetic locking rod 18 passes through the DC coil of the electromagnetic controller 4. It includes a first locking end and a second locking end with an annular groove. The first locking end passes through the column of the frame 2 after passing through the DC coil. It can cooperate with the locking plate on the active valve plate 3 that is bent toward the column to lock the active valve plate 3, that is, the head of the locking plate is locked and embedded in the locking area of ​​the first locking end of the locking rod. The first locking end of the locking rod locks the locking plate to prevent the active valve plate 3 from closing, and keeps the active valve plate 3 in a non-closing state during normal and abnormal oil flow, solving the problem of the closing valve being closed by mistake. Since the signal output by the fire extinguishing device is DC 24V, the electromagnetic locking rod 18 retracts after receiving the signal. The signal output time is 1.5 seconds. The locking rod must be locked within 1.5 seconds to prevent the electromagnetic locking rod 18 from popping out after the signal stops and re-locking the active valve plate 3. Therefore, the annular groove at the other end of the retracted electromagnetic locking rod 18 is used to lock the locking rod after the locking spring is inserted into the groove.

[0020] When the transformer catches fire, the fire extinguishing device will output an oil discharge signal, open the oil discharge valve, and the transformer oil in the transformer will be discharged outward. This signal is also used to transmit to the shut-off valve of this embodiment to release its lock, and the active valve plate will be closed with the oil flow discharged outward. The advantages of this are: (1) The shut-off valve is usually in a locked state, and the active valve plate is not closed due to unexpected factors, and there is no possibility of accidental closure, so people can use it with confidence; (2) The setting of the closing flow rate value of the shut-off valve can be made smaller, so that the active valve plate can be closed under low-speed oil flow, and the anti-impact force after the shut-off is also small, which is more conducive to achieving one-time effective closure; (3) When the valve plate of the shut-off valve is closed, the locking spring on it and the control dial lock, ensuring that it can be closed once under any adverse factors.

[0021] In this embodiment, after the electromagnetic lock rod 18 is retracted, it is controlled to extend outward by the pressure plate 41 connected to the top of the electromagnetic controller 4. The back of the pressure plate 41 is connected to the reset spring sheet 42. The front end of the reset spring sheet 42 is tilted relative to the pressure plate 41 to provide an upward rebound force for the pressure plate 41. The downwardly bent finger end of one side of the pressure plate 41 overlaps the locking spring sheet, and the pressure plate 41 is pressed downward. The finger end presses down the locking spring sheet so that the second locking end of the electromagnetic lock rod 18 is disengaged from the locking rod slot, releasing the locking spring sheet from the locking rod, and the electromagnetic lock rod 18 rebounds. In this embodiment, the position of the probe 7 located in the left compartment of the hatch 6 corresponds to the pressure plate 41. The operation of the probe 7 causes the electromagnetic controller electromagnetic lock rod to pop out and restore the control of the active valve plate 3.

[0022] The active valve plate 3 of this embodiment includes an active plate, a clamping plate and a valve plate. The valve plate is located at the center of the active plate 3, and is connected to a tension spring 8 that helps the active valve plate 3 return to the operating position. Magnets are installed on the two arms of the active plate respectively, and a first connecting arm and a second connecting arm are provided on the stand. The first connecting arm is connected to a first reed switch, and the second connecting arm is connected to a second reed switch. When the active valve plate 3 is closed, the magnet connects the first reed switch and the second reed switch. When the active valve plate 3 is opened, the first reed switch and the second reed switch are always in an open state.

[0023] In this embodiment, a rubber ring 11 is added outside the inner diaphragm 17 at the outer end of the rotating shaft 10 connected to the active valve plate 3, and a pressure pad 13 is provided outside the rubber ring 11 to realize a double-layer sealing structure of dynamic sealing and static sealing. One end of the rotating shaft 10 of this embodiment is connected to the handle 15, and the rotating shaft 10 rotates under the control of the handle 15. After the closing valve operation is completed and before it is put into operation, the limit sealing cover 14 must be installed, that is, the handle 15 is limited to the correct position, and the rubber ring 11 is statically sealed to keep the rotating shaft 10 from leaking oil for a long time, and it is convenient to replace the rubber ring during maintenance. The limit sealing cover 14 of this embodiment has an opening on one side, and the opening allows the handle 15 to be clamped in the limit sealing cover 14 to prevent it from shifting. Fixing bolts are provided on the upper and lower parts of the limit sealing cover 14 respectively, which are used to fix the limit sealing cover 14 on the housing 1. The double-layer sealing structure of this embodiment can convert the rotating shaft 10 from a dynamic seal to a static seal, which can maintain oil leakage for a long time and can also keep the handle 15 in the correct position. If the sealing ability of the rubber ring decreases after long-term operation, the handle 15 can be removed, the pressure pad 13 and the rubber ring 11 can be taken out, the spare rubber ring can be reinstalled, and the pressure pad 13 and the handle 15 can be reinstalled to resume normal use.

[0024] The other end of the rotating shaft 10 of the present embodiment is connected to the control dial 20, which is a fan-shaped structure, and is controlled by the handle 15 to rotate with the rotating shaft 10. The control dial 20 includes a locking hook arranged on a vertical edge on one side of the fan-shaped structure and a U-shaped groove arranged on a vertical edge on the other side of the fan-shaped structure. The locking hook in the present embodiment includes an outer arc surface 20-1 and an inner arc shape 20-2. The locking hook is engaged and locked with a locking spring piece 19 fixed on the active valve plate 3. The locking spring piece 19 of the present embodiment has an elastic locking end, which is used to engage with the locking hook to lock and fix the active valve plate 3. In the present embodiment, before closing, the front end of the locking spring piece 19 first contacts the outer arc surface 20-1 of the control dial 20, and as the closing angle decreases, the spring piece bends upward and passes through the top hook, and then the spring piece becomes straight and hooks and locks with the inner arc surface 20-2 of the control dial 20. The outer arc surface 20-1 protruding from the fan-shaped vertical edge of the control dial 20 is the contact surface for opening the valve plate, and is also the sliding surface for the buckle and lock spring 19 when the active valve plate 3 is closed. The inner arc 20-2 facing away from it is the locking hook of the buckle and lock spring 19, and the U-shaped groove in the forward direction of the fan-shaped horizontal edge is the guide groove of the lever when the control valve plate is closed. When the locking hook on the control dial 20 is pressed in the open position, it is disengaged from the buckle and lock spring 19, unlocking the active valve plate 3.

[0025] The U-shaped groove of this embodiment is used to cooperate with the lever 21 fixed on the active valve plate 3, and when the active valve plate 3 is turned from a closed state to an open state, the maximum rotation stroke of the control dial 20 is limited; when the active valve plate 3 is turned from an open state to a closed state, the end of the control dial 20 is brought into contact with the active valve plate 3, and the active valve plate 3 is driven to close under the moving trajectory restricted by the U-shaped guide groove.

[0026] The working principle of this embodiment is: When the transformer is operating normally, the cut-off valve is controlled (locked) by the electromagnetic controller, and the active valve plate is in a forced open state, and will not be mistakenly closed due to vibration, tripping, and unexpected strong oil flow; when the fire extinguishing device starts and sends an oil discharge cut-off instruction (signal), the electromagnetic controller releases the lock of the active valve plate, and the leaked oil flow impacts the active valve plate to automatically close, and an alarm signal is issued. The active valve plate 3 of the cut-off valve in this embodiment is always forced to be opened at a degree greater than 35 to ensure that the oil-passing cross-sectional area is not less than the pipeline diameter cross-sectional area. The active valve plate 3 is flexible after being released from control, ensuring that it automatically closes under the impact of oil flow; during normal operation, the electromagnetic controller locks the active valve plate 3. After the fire extinguishing device is started, the lock of the active valve plate 3 is automatically released, and the oil discharge cut-off is automatically responded. The two reed switches set on the frame are in a normally open state during operation, and no alarm signal is output. After the active valve plate 3 is closed, the reed switch is connected and an alarm signal is output. The left chamber on the cover has an air plug and a probe 7: used to discharge gas before operation, operate the probe 7 to make the electromagnetic controller lock rod pop out, and restore the control of the active valve plate 3; turn the handle 15 to drive the manual control mechanism to open or close the active valve plate 3. In order to ensure that the shut-off valve is not used incorrectly, the control of the electromagnetic controller is only adjusted by DC signal control, and no mechanical control structure is added to retract the lock rod. Once the installation and debugging are completed, the active valve plate is always in a forced open state, and the casual operation of the personnel will not cause the lock rod to retract the valve plate out of control.

[0027] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art who is familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A signal-controlled synchronous response type stop valve, comprising a housing with a visual window and a hatch cover covering the housing, a frame installed in the housing, and an active valve plate, an electromagnetic controller and a flow rate setting device installed on the frame, characterized in that: An inner spacer, a rubber ring and a pressure pad are provided on the surface of the housing where the rotating shaft extends out. The rubber pad is in a relaxed state when the rotating shaft is rotated to adjust the valve plate. After the operation is completed, the handle is placed in the running position and fixed. A sealing cover for limiting the handle is installed outside the handle. The sealing cover is a structure with an opening on one side, and the opening allows the handle to enter the limiting sealing cover. Fixing bolts that fix the limiting sealing cover to the housing are respectively provided above and below the limiting sealing cover. When the handle is restricted from rotating, the pressure pad compresses the rubber ring to form a static seal.

2. The signal-controlled synchronous response type shut-off valve according to claim 1, characterized in that: The inner frame on the electromagnetic controller is equipped with a coil, a locking rod sliding sleeve and a spring, and is penetrated by a retractable electromagnetic locking rod that performs axial movement. The extension of the locking rod is controlled by the spring and the electromagnetic locking rod pops out when the coil has no magnetic force. The first locking end of the electromagnetic locking rod forms a lock with the active valve plate to keep the active valve plate in the open position; after the fire extinguishing signal is issued, the electromagnetic locking rod retracts, and the second locking end of the electromagnetic locking rod has an annular groove that cooperates with the locking spring piece fixed on the bottom plate of the electromagnetic controller housing. After the locking spring piece enters the groove, it locks the locking rod to prevent the locking rod from popping out after the signal stops, and re-locks the active valve plate to ensure that the active valve plate runs to the closed position with the impact of the oil flow.

3. The signal-controlled synchronous response type shut-off valve according to claim 1, characterized in that: After the electromagnetic locking rod is retracted, it must be reset by the pressure plate. The pressure plate is mounted on the top of the side panel of the electromagnetic controller housing. The tongue plate on the side panel of the housing has an angle limiting effect on the pressure plate. The pressure plate can move within the limiting angle. The reset spring sheet connected to the front end of the pressure plate provides an upward rebound force for the pressure plate. The pressing contact finger of the pressure plate overlaps the locking spring sheet located at the bottom of the electromagnetic controller housing. Pressing the locking spring sheet downward disengages the second locking end of the locking rod from the locking limit of the locking spring sheet, causing the locking rod to pop outward and restore the locking of the active valve plate.

4. The signal-controlled synchronous response type shut-off valve according to claim 1, characterized in that: Above the pressing plate is a probe arranged in the left compartment of the hatch cover, and the probe provides artificial downward pressing force for the pressing plate.

5. The signal-controlled synchronous response type shut-off valve according to claim 1, characterized in that: A normally open first magnetic reed switch and a second magnetic reed switch are symmetrically arranged on the stand. When the valve plate is in the operating position, the first magnetic reed switch and the second magnetic reed switch are always in an open state.

6. The signal-controlled synchronous response type shut-off valve according to claim 1, characterized in that: The active valve plate is also connected to a locking spring piece for locking the control dial when closed. Before closing, the front end of the locking spring piece first contacts the outer arc surface of the control dial and bends upward as the closing angle becomes smaller. After passing through the top hook, the spring piece becomes straight and locks with the hook on the inner arc surface of the control dial.

7. The signal-controlled synchronous response type shut-off valve according to claim 6, characterized in that: The outer arc surface protruding from the fan-shaped vertical edge of the control dial serves as the contact surface for opening the valve plate, and serves as the sliding passing surface for the locking spring when the valve plate is closed. The inner arc protruding from the fan-shaped vertical edge of the control dial serves as the locking hook of the locking spring, and the forward U-shaped groove of the fan-shaped horizontal edge serves as the guide groove of the lever when the control valve plate is closed.

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