An explosion-proof electromagnetic pulse valve

Abstract

An explosion-proof electromagnetic pulse valve includes a valve body, a large end cap, a small end cap, an explosion-proof head, and a large diaphragm. The valve body is designed with a working port and an air inlet, i.e., an outlet and an inlet. The valve body (1) is provided with a lower cavity, an upper cavity, a large diaphragm (7), and a diaphragm spring located between the lower cavity and the upper cavity. A channel hole is provided between the lower cavity and the upper cavity. A large valve port is provided on the top of the valve body and is covered by the large end cap (2). The large end cap is provided with a large end cap exhaust port and a large end cap ventilation port. The valve body and the large end cap are assembled by the large end cap fastening screw (3). A large diaphragm is installed in the middle, dividing the internal cavity into a lower cavity (1-3) and an upper cavity. After the valve body and the large end cap are installed, a channel hole is formed. A large diaphragm spring (8) is installed between the large diaphragm and the large end cap. The upper end of the large end cap and the small end cap (4) are assembled by the small end cap fastening screw (6). A small diaphragm (9) is installed in the middle. A small diaphragm spring is installed between the small diaphragm and the small end cap.

Description

Technical Field

[0001] This utility model relates to an explosion-proof electromagnetic pulse valve, and more particularly to an explosion-proof electromagnetic pulse valve. Background Technology

[0002] Most electromagnetic pulse valves on the market are non-explosion-proof, with ordinary electromagnetic coils controlling the opening and closing of the pulse valve; or a small number of potted explosion-proof electromagnetic pulse valves, which are mostly suitable for dusty environments or occasions where fire sources need to be isolated.

[0003] Existing explosion-proof solenoid valves are suitable for hazardous environments containing flammable and explosive gases or dust. The following is a brief introduction: Structurally, they typically consist of an explosion-proof electromagnetic pilot control device, a diaphragm, and an explosion-proof valve body.

[0004] Explosion-proof rating: Common explosion-proof markings include Exmb II T4 / DIP A20 TA, T4, conforming to relevant standards such as GB3836.1, GB3836.9, and GB12476.1. Applicable environment: Suitable for Zone 1 or Zone 2 environments where there are or may be Class II, T1 to T4 group flammable gases or vapors mixed with air, forming an explosion hazard, or Zone 20 environments with Type A flammable dust. Widely used in petrochemical, pharmaceutical, food processing, coal mining, metallurgy, and environmental protection industries, primarily in gas filtration and dust removal systems to help clean accumulated dust in dust collectors and ensure the safety of the production process.

[0005] Explosion-proof type: The core of the design is to "isolate risks". Whether it is the electric spark generated by the electromagnetic coil, the high temperature of the component friction, or the internal gas leakage, the structural design must "block" its contact with external flammable and explosive substances (such as methane and dust).

[0006] Its outer casing adopts an explosion-proof structure. Even if sparks are generated internally due to a malfunction, they will be encased in the robust casing. Furthermore, the gap between the casing and the components (the "explosion-proof gap") is precisely controlled within 0.1-0.2mm, ensuring that sparks will not escape and ignite external gases. Existing conventional designs only focus on "on / off efficiency," such as the diaphragm's response speed and sealing (preventing ordinary leakage), completely neglecting "ignition prevention"—the coil may generate noticeable electric sparks when energized, and the casing lacks explosion-proof capability. If used in hazardous environments, the sparks are directly exposed to the air, easily leading to an explosion. Besides the core "explosion-proof casing," the explosion-proof type uses an explosion-proof sealed connector at the cable entry point to prevent external flammable and explosive gases from entering the valve through cable gaps; conventional types mostly use ordinary waterproof connectors without explosion-proof sealing capability.

[0007] For reliable explosion protection, explosion-proof surfaces need to be designed to better suit explosive gas environments, such as coal mines or chemical plants. Utility Model Content

[0008] The purpose of this invention is to provide an explosion-proof electromagnetic pulse valve that confines the internal explosion of the equipment to the inside through an explosion-proof shell, preventing the leakage of flames and high-temperature gases. In particular, it is designed with two explosion-proof surfaces, making it suitable for explosive gas environments such as coal mines or chemical plants.

[0009] The technical solution of this utility model is an explosion-proof electromagnetic pulse valve, comprising a valve body, a large end cap, an explosion-proof head, and a large diaphragm; the valve body is designed with a working port and an air inlet, i.e., an outlet and an inlet; the valve body has a lower cavity and an upper cavity 1-5; the large diaphragm 7 and a diaphragm spring are located between the lower cavity and the upper cavity; a channel hole is provided between the lower cavity and the upper cavity 1-5; a large valve port is provided at the top of the valve body and is covered by the large end cap 2; the large end cap 2 has a large end cap exhaust hole 2-1 and a large end cap. Vent hole 2-2; valve body 1 and large end cover 2 are assembled by large end cover fastening screw 3, with a large diaphragm 7 installed in the middle, dividing the internal cavity into lower cavity 1-3 and upper cavity 1-5. After valve body 1 and large end cover 2 are installed, channel hole 1-4 is formed. A large diaphragm spring 8 is installed between large diaphragm 7 and large end cover 2; the upper end of large end cover 2 is assembled with small end cover 4 by small end cover fastening screw 6, with a small diaphragm 9 installed in the middle, and a small diaphragm spring 1 is installed between small diaphragm 9 and small end cover 4. 0; An explosion-proof head 5 is installed on the upper end of the small end cap 4; The explosion-proof head 5 is installed on the lower end of the explosion-proof valve body 5-2 by the explosion-proof valve seat 5-3, and the explosion-proof cover 5-1 is installed on the upper end of the explosion-proof valve body 5-2. A stationary iron core 5-6 is welded in the middle of the explosion-proof valve seat 5-3 to form an explosion-proof space. The connection gap between the explosion-proof cover 5-1 and the explosion-proof valve body 5-2 is the first explosion-proof surface 5-3; The second explosion-proof surface 5-5 is the connection gap between the explosion-proof valve body 5-2 and the explosion-proof valve seat 5-3. The coil 13 is installed Within the aforementioned explosion-proof space, a stationary iron core is fixed inside the coil 13, and a moving iron core is located below the stationary iron core. A moving iron core sealing gasket 12-1 is installed at the lower end of the moving iron core 12, and a conical spring 11 is provided to press the moving iron core 12 downward. The moving iron core sealing gasket 12-1 forms a seal with the hole on the small end cover 4, i.e., the small valve port 4-2. One end of the cable 15 is connected to the electromagnetic coil 13, and the other end extends from the electrical interface 5-7 on the explosion-proof valve body 5-2. An explosion-proof connector 14 is installed at the electrical interface end.

[0010] Pressurized working medium is introduced through inlet 1-2 and channel hole 1-4, making the pressure in upper chamber 1-5 and lower chamber 1-3 equal. Large diaphragm spring 8 presses large diaphragm 7 downward, and the bottom of large diaphragm 7 forms a seal with large valve port 1-6, keeping working port 1-1 closed. Small diaphragm spring 10 presses small diaphragm 9 downward, and the bottom of small diaphragm 9 forms a seal with large end cap vent hole 2-2. A moving iron core sealing gasket 12-1 is installed at the lower end of moving iron core 12, and a conical spring 11 presses moving iron core 12 downward, forming a seal with small valve port 4-2. When the electromagnetic coil 13 is energized, the stationary iron core is fixed, and the moving iron core 12 generates an electromagnetic force with the stationary iron core 5-6. The electromagnetic force overcomes the conical spring 11, so after being energized, the moving iron core moves upward in the contact direction and the small valve port 4-2 opens, the working medium is discharged from the exhaust port 4 of the small end cover, the pressure drops, and the pressure balance is broken. At this time, the spring force of the small diaphragm spring 10 is not enough to overcome the pressure difference, and the pressure at the vent port 2-2 of the large end cover pushes the small diaphragm 9 open. After it is pushed open, the working medium is discharged from the exhaust port 2-1 of the large end cover, the pressure in the lower cavity 1-5 drops, and the pressure balance is broken. At this time, the spring force of the large diaphragm spring 8 is not enough to overcome the pressure difference, and the large valve 1-6 opens. At the moment of opening, a high-pressure impact airflow is formed at the working port 1-1, and then a stable airflow is formed after the pressure balance is achieved. When the vent hole of the large end cap 2-2 is not working, the small diaphragm 9 is closed due to the force of the small diaphragm spring 10 at its upper end, and the vent hole of the large end cap is open to the atmosphere. When the pulse valve is energized, the pressure above the small diaphragm 9 decreases, while the pressure below the small diaphragm 9 remains unchanged. The pressure difference overcomes the small diaphragm spring and pushes it up, opening the vent hole of the large end cap 2-2. Gas then flows into the vent hole of the large end cap 2-1 and enters the atmosphere. After the small diaphragm 9 opens, 2-1 and 2-2 are connected.

[0011] When the large end cap vent 2-2 is not working, the small diaphragm 9 is in a neutral position due to the force of the small diaphragm spring 10 at its upper end, and the large end cap vent is open to the atmosphere. When the pulse valve is energized, the pressure above the small diaphragm 9 decreases, while the pressure below the small diaphragm 9 remains unchanged. This pressure difference overcomes the pressure of the small diaphragm spring, causing the large end cap vent 2-2 to open, allowing gas to flow into the large end cap vent 2-1 and into the atmosphere. After the small diaphragm 9 opens, 2-1 and 2-2 are connected.

[0012] The gas above the diaphragm is discharged into the atmosphere through the exhaust port 2-1 on the large end cap. The pressure above the diaphragm decreases, while the pressure in the lower chamber remains unchanged. The pressure difference overcomes the spring force above the diaphragm, lifting it for blowing. After the pulse signal disappears, the explosion-proof electromagnetic pilot control device resets, the moving iron core closes the unloading hole, and the gas pressure in the rear chamber of the diaphragm, combined with the spring force, causes the diaphragm to close the channel, stopping the blowing.

[0013] Beneficial effects: This utility model, with its large diaphragm and small diaphragm 9 structure of the explosion-proof head, and its design of two explosion-proof surfaces, is suitable for explosive gas environments. The explosion-proof surfaces and the explosion-proof shell confine the explosion inside the equipment, preventing the leakage of flames and high-temperature gases, resulting in better explosion-proof performance. Furthermore, the design of the large and small diaphragms is a structural feature for the gradual release of pressure, which improves the reliability of the valve during use and ensures the reliability of the valve's opening and closing. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of this utility model;

[0015] Figure 2 This utility model Figure 1 A sectional view;

[0016] Figure 3 This utility model Figure 2 A detailed cross-sectional view of the septum-shaped head. Detailed Implementation

[0017] As shown in the figure, 1. Valve body, 1-1 Working port, 1-2 Air inlet, 1-3 Lower cavity, 1-4 Channel hole, 1-5 Upper cavity, 1-6 Large valve port; 2 Large end cap, 2-1 Large end cap exhaust hole, 2-2 Large end cap vent hole, 3 Large end cap fastening screw, 4 Small end cap, 4-1 Small end cap exhaust hole, 4-2 Small valve port, 5 Explosion-proof head, 5-1 Explosion-proof cover, 5-2 Explosion-proof valve body, 5-3 Explosion-proof valve seat, 5-4 First explosion-proof surface, 5-5 Second explosion-proof surface, 5-7 Electrical interface, 5-6 Static iron core, 6. Small end cap fastening screw, 7. Large diaphragm, 8. Large diaphragm spring, 9. Small diaphragm, 10. Small diaphragm spring, 11. Conical spring, 12. Moving iron core, 12-1. Moving iron core sealing gasket, 13. Electromagnetic coil, 14. Explosion-proof connector, 15. Cable.

[0018] Explosion-proof electromagnetic pulse valves achieve rapid on / off switching of gas (mostly compressed air) through electromagnetic drive, while relying on the "explosion-proof structure" to block the propagation of sparks or explosion flames that may be generated inside to the outside.

[0019] This utility model comprises a valve body, an explosion-proof head, an explosion-proof surface, and a diaphragm. The structural design of each component is directly related to its explosion-proof performance. The valve body is the "main frame" of the explosion-proof electromagnetic pulse valve, responsible not only for the flow, pressure stabilization, and injection control of compressed air, but also for providing the installation reference for the explosion-proof surface components, diaphragm, and other parts. It must also withstand potential internal explosion pressure (typically designed pressure ≥ 1.5 times the maximum working pressure to ensure structural integrity). The opening and closing of the diaphragm controls the flow of compressed air from the "inlet → valve chamber → injection port," meeting the high-frequency requirements of pulse jet injection. It includes a pre-installed explosion-proof head mounting interface (with an explosion-proof surface), a diaphragm sealing groove, and inlet / injection port threads (mostly G1 / 2 or G3 / 4 pipe threads, some with explosion-proof threads).

[0020] The system uses diaphragms of different sizes to divide the cavity into upper and lower chambers. Both diaphragms operate on the same principle: when the solenoid valve is energized, the upper chamber is vented to the atmosphere. As the pressure drops, a pressure difference is established between the upper and lower chambers, causing the diaphragm to open. The diaphragm design allows for a gradual release of pressure.

[0021] Achieve pressure differential drive; Pressure adaptation: The air inlet is equipped with a "pressure stabilizing groove" (depth 2-3mm, width 5-8mm) to ensure stable compressed air pressure (fluctuation ≤ ±0.05MPa) and avoid fatigue damage to the diaphragm due to frequent operation caused by sudden pressure changes; Explosion-proof redundancy: The valve body wall thickness is designed according to "maximum explosion pressure × 1.2 safety factor".

[0022] Interface sealing: The inlet / jet port thread must be fitted with an explosion-proof gasket, such as an oil-resistant nitrile rubber gasket with a hardness of 60±5 Shore A, to ensure gas sealing without affecting the gap of the explosion-proof thread surface (do not block the thread meshing gap).

[0023] The explosion-proof head is an integrated component that combines electromagnetic drive and explosion-proof protection. It includes an explosion-proof head valve body, internally encapsulating driving elements such as an electromagnetic coil and armature, and externally connected to the valve body via an explosion-proof surface. When energized, it drives the diaphragm to actuate, simultaneously preventing the propagation of electrical sparks (such as inter-turn breakdown sparks) generated when the coil is energized to the external hazardous environment. The connection gap between the 5-1 explosion-proof cover and the 5-2 explosion-proof valve body forms the first explosion-proof surface 5-3; the second explosion-proof surface 5-5 is the connection gap between the 5-2 explosion-proof valve body and the 5-3 explosion-proof valve seat.

[0024] Electromagnetic drive: When the coil is energized, it generates a magnetic field that attracts the moving iron to move. This moves the diaphragm (or pilot valve core) through the push rod, thus realizing the opening and closing of the diaphragm in response to the pressure change in the valve chamber.

[0025] Spark explosion protection: The structural design of the explosion protection head housing and internal components must meet the "explosion protection" requirements to ensure that internal sparks and high-temperature gases do not leak to the outside;

[0026] The explosion-proof housing of the explosion-proof head is cylindrical or square, with a wiring port at the top (with a threaded explosion-proof surface) and a flange at the bottom for connection to the valve body (with a flat / stop explosion-proof surface); the coil assembly uses "temperature-resistant enameled wire" (such as 180-grade polyimide enameled wire, temperature resistance ≥180℃), and the coil frame is flame-retardant PA66+GF30 (glass fiber reinforced nylon, flame retardant rating V0) to prevent the coil from overheating and igniting;

[0027] The lower end of the moving iron core (push rod) is the second explosion-proof surface; 14. Explosion-proof connector and 15. cable are installed inside the terminal cavity. Independent of the coil cavity.

[0028] Explosion-proof enclosure body: cast aluminum alloy (such as ADC12) or stainless steel (such as 304, suitable for corrosive environments), wall thickness ≥5mm (to ensure explosion-proof strength);

[0029] Sealing components: Explosion-proof connectors and coil outlets use "explosion-proof sealing rings" (such as silicone rubber, temperature resistant from -40℃ to 200℃) to both seal and fix the wires, preventing the wires from shaking and damaging the explosion-proof gap.

[0030] Two explosion-proof surfaces: The two explosion-proof surfaces of the explosion-proof electromagnetic pulse valve are the key structures for realizing the explosion-proof function. Both must meet the requirements of the explosion-proof standard for gap, length and surface roughness at the same time. None of them can be missing, otherwise the overall explosion-proof performance will fail.

[0031] First explosion-proof surface: Explosion-proof surface connecting the explosion-proof head and the valve body (flange / stop type)

[0032] Structural form: Most are "fireproof face with stop" (which takes into account both flat and cylindrical fireproof surfaces), and a few small diameter valves use "flat flange fireproof face". The core is to form a sealing and fireproof channel by matching the stop at the bottom of the fireproof head with the stop at the top of the valve body.

[0033] Functional positioning: to block the heat / spark transfer between the "valve body interior (flame that may be generated by the explosion of the medium)" and the "explosion isolation head interior (coil spark)", while bearing the explosion pressure and preventing the explosion isolation head from separating from the valve body;

[0034] Second explosion-proof surface: Explosion-proof surface (cylindrical) where the armature push rod and the explosion-proof shell meet.

[0035] Structural form: It is a clearance fit between the inner cylinder (explosion-proof shell hole) and the outer cylinder (armature push rod), which is the only moving channel between the inside (coil cavity) and the outside (valve body cavity) of the explosion-proof head. It is necessary to ensure explosion-proof performance while allowing the armature to move freely.

[0036] Functional positioning: The sparks generated when the coil is energized (such as inter-turn sparks and armature impact sparks) leak into the valve body cavity through the gap between the push rod and the housing, thereby preventing the ignition of flammable media (such as compressed air containing dust) that may be present in the valve body cavity.

[0037] Key parameters (compliant with GB 3836.2Ex d IIC level requirements):

[0038] Explosion-proof gap (δ): ≤0.10mm (because the push rod needs to move, the gap needs to be smaller to avoid spark leakage); Effective length (L): ≥25mm (during the movement of the push rod, the effective engagement length is always not less than 25mm, and the push rod stroke redundancy needs to be reserved. For example, when the stroke is 5mm, the total engagement length is ≥30mm);

[0039] Surface roughness (Ra): ≤3.2μm (higher smoothness can reduce uneven gaps and avoid local gap exceeding the standard);

[0040] Cylindricity: ≤0.05mm (to avoid elliptical push rods causing increased local clearance); Explosion-proof structure:

[0041] The explosion-proof valve seat 5-3 and the explosion-proof valve body 5-2 form a cylindrical explosion-proof first explosion-proof surface 5-4, and the explosion-proof cover 5-1 and the explosion-proof valve body 5-2 form a cylindrical explosion-proof second explosion-proof surface 5-5. The explosion-proof surfaces have very small gaps and sufficient explosion-proof surface lengths, so that when the electromagnetic coil 13 installed in the explosion-proof space explodes, the explosion cannot pass through the explosion-proof joint surface and affect the external environment.

[0042] Diaphragm: The core of media control and sealing. The diaphragm is the "actuating element" of the explosion-proof electromagnetic pulse valve. It realizes the opening and closing and sealing of the valve cavity through its own elastic deformation. At the same time, it must withstand the pressure impact of compressed air, media corrosion (such as oil-containing and dust-containing air) and high-frequency operation fatigue. Its performance directly affects the service life and explosion-proof safety of the valve (diaphragm rupture will lead to media leakage, which may cause external explosion).

[0043] Pressure-driven and on / off control: By controlling the pressure difference between the control chamber and the intake chamber, the diaphragm is "closed (sealed in the intake chamber)" and "opened (connected the intake chamber and the injection chamber)" to control the injection of compressed air;

[0044] The diaphragm is a "circular composite diaphragm" made of either "nitrile rubber (NBR)" (oil resistant, suitable for oil-containing compressed air) or "fluororubber (FKM)" (high temperature and corrosion resistance, suitable for high temperature / strong corrosion environments, such as chemical plants).

[0045] The explosion-proof electromagnetic pulse valve's valve body, explosion-proof head, two explosion-proof surfaces, and diaphragm form a "synergistic explosion-proof system": the valve body provides the foundation for load-bearing and media control; the explosion-proof head enables electromagnetic actuation and internal spark protection; the two explosion-proof surfaces construct a double explosion-proof barrier, both external and internal; and the diaphragm ensures media sealing and actuation. During selection and use, it is crucial to pay close attention to the parameter compatibility of the explosion-proof surfaces (gap, length, roughness), the material compatibility of the diaphragm (temperature resistance, corrosion resistance), and the coil safety of the explosion-proof head (temperature rise, flame retardancy). Strict adherence to maintenance requirements (prohibition of unauthorized modification of the explosion-proof surfaces, regular replacement of vulnerable parts) is also essential to ensure its safe and reliable operation in flammable and explosive environments.

[0046] Internal components: The explosion-proof electromagnetic coil uses high-temperature resistant enameled wire (capable of withstanding temperatures above 135℃), and there is an insulating layer between the coil and the outer shell; the ordinary coil has a standard temperature resistance rating (such as 80℃) and no special isolation design.

[0047] Material selection: Explosion-proof shells are mostly made of cast aluminum alloy (ZL102) or stainless steel (304), which are impact-resistant and corrosion-resistant (to avoid material corrosion causing gaps and compromising the explosion-proof effect); ordinary shells are commonly made of engineering plastics (such as ABS) or ordinary cold-rolled steel, which have no explosion-proof or corrosion-resistant requirements.

[0048] To prevent the electrical sparks / high temperatures generated during its own operation from igniting external flammable and explosive materials, it only achieves "on / off control" to meet the fluid / gas injection requirements under normal operating conditions.

[0049] Applicable environments include hazardous locations (such as chemical workshops, coal mines, dusty workshops, etc.) and conventional environments (such as ordinary factories, civil buildings, etc.) without flammable and explosive materials.

[0050] Explosion-proof structural design includes special features such as explosion-proof enclosure, flameproof gap, and sealing structure. Without an explosion-proof structure, the enclosure only serves a protective function (dustproof and waterproof).

[0051] Explosion-proof certification and standards must pass national explosion-proof certification (such as GB3836, GB12476). If there is an explosion-proof mark, explosion-proof certification is not required; it only needs to comply with general industrial product standards (such as GB / T).

[0052] Key components are typically made with cast aluminum or stainless steel for the outer casing, while internal components are typically made with plastic or ordinary steel for the outer casing, which is heat-resistant and anti-static. Components do not have special explosion-proof requirements.

[0053] Operational safety (hazardous environment): Safe, no risk of ignition; extremely dangerous, easily ignited by electric sparks / high temperature.

[0054] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. An explosion-proof electromagnetic pulse valve, characterized in that, The valve body includes a valve body, a large end cap, a small end cap, an explosion-proof head, and a large diaphragm. The valve body is designed with a working port and an air inlet, i.e., an outlet and an inlet. The valve body (1) has a lower cavity, an upper cavity (1-5), a large diaphragm (7), and a diaphragm spring located between the lower cavity and the upper cavity. A channel hole is provided between the lower cavity and the upper cavity. A large valve port is provided on the top of the valve body and is covered by the large end cap (2). The large end cap has a large end cap exhaust hole (2-1) and a large end cap vent hole (2-2). The valve body and the large end cap are assembled by the large end cap fastening screw (3). A large diaphragm is installed in the middle, dividing the internal cavity into a lower cavity (1-3) and an upper cavity. After the valve body and the large end cap are installed, a channel hole (1-4) is formed. A large diaphragm spring (8) is installed between the large diaphragm and the large end cap. The upper end of the large end cap and the small end cap (4) are assembled by the small end cap fastening screw (6). A small diaphragm (9) is installed in the middle, and a small diaphragm spring (10) is installed between the small diaphragm and the small end cover; an explosion-proof head (5) is installed on the upper end of the small end cover (4); the explosion-proof head is installed on the lower end of the explosion-proof valve body (5-2) by the explosion-proof valve seat (5-3), and an explosion-proof cover (5-1) is installed on the upper end of the explosion-proof valve body. A stationary iron core (5-6) is welded in the middle of the explosion-proof valve seat, forming an explosion-proof space. The connection gap between the explosion-proof cover and the explosion-proof valve body becomes the first explosion-proof surface (5-4); the second explosion-proof surface (5-5) is the connection gap between the explosion-proof valve body and the explosion-proof valve seat. A coil (13) is installed in the explosion-proof space. The stationary iron core is fixed in the coil. The moving iron core is located at the lower part of the stationary iron core. A conical spring (11) is provided to press the moving iron core (12) downward. The moving iron core sealing gasket (12-1) and the small valve port (4-2) on the small end cover form a seal.

2. The explosion-proof electromagnetic pulse valve according to claim 1, characterized in that, A moving iron core sealing gasket is installed at the lower end of the moving iron core (12).

3. The explosion-proof electromagnetic pulse valve according to claim 1, characterized in that, One end of the cable is connected to the electromagnetic coil, and the other end extends from the electrical interface on the explosion-proof valve body. An explosion-proof connector is installed at the electrical interface end.

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