DFB-20/10 Mining Explosion proof Electromagnetic Valve for Coal Mine Underground Hydraulic Support Control Special

Description :

The DFB-20/10 mining explosion-proof solenoid valve is a hydraulic control core component designed specifically for harsh environments underground in coal mines. It mainly solves the control problem of safe and precise operation of hydraulic supports in flammable and explosive gas environments. This equipment controls the on/off and flow direction of hydraulic oil through electromagnetic signals, achieving actions such as lifting, lowering, and pushing of supports. Typical working conditions include the automation control system of the fully mechanized mining face and remote control of individual hydraulic supports, ensuring stable operation in environments containing explosive mixtures such as methane and coal dust, and ensuring the safety of mine operations.

  The explosion-proof solenoid valve used in this mine strictly complies with the MT/T standard and the GB3836 series standard for electrical equipment used in explosive environments, and has an ExdI Mb explosion-proof rating to ensure safe use underground in coal mines. Its nominal diameter is usually 10mm or 20mm (depending on the specific sub model), and the rated working pressure can reach 20MPa to 31.5MPa, suitable for the requirements of high-pressure hydraulic systems. The valve body is made of high-strength alloy steel or stainless steel material, which has undergone precision machining and anti-corrosion treatment. The coil insulation level is high, and the protection level reaches IP54 or above. It can maintain stable electrical performance for a long time in humid and dusty underground environments, and has excellent impact and vibration resistance.

  When selecting the DFB-20/10 mining explosion-proof solenoid valve, it is necessary to focus on checking whether the working voltage (commonly AC127V, DC24V, etc.) matches the underground power supply system, and whether the flow coefficient meets the requirements of the support action speed. This product is suitable for hydraulic circuits that require frequent reversing and fast response speed, and is not suitable for ordinary industrial hydraulic systems that require extremely high cleanliness of the medium and no filtering measures. Compared with ordinary industrial solenoid valves, its shell has a special explosion-proof structure, and the wiring chamber is isolated from the main chamber to prevent internal electric sparks from igniting external explosive gases. When purchasing, it is necessary to confirm whether it has a valid mining product safety mark certificate (MA certification).

  Before installing the DFB-20/10 mining explosion-proof solenoid valve, it is necessary to thoroughly clean the hydraulic pipeline to prevent welding slag and iron chips from entering the valve core and causing jamming. It is recommended to install a high-precision filter before the oil inlet. In daily maintenance, it is necessary to regularly check whether the coil wiring terminals are loose, whether the shell grounding is good, and monitor whether the surface temperature of the valve body is within the allowable range. Common faults include valve core jamming, coil burnout, or oil leakage. If slow or unresponsive operation is found, the electrical signal and hydraulic pressure should be checked first, and then the sealing components should be disassembled, cleaned, or replaced. It is strictly prohibited to open the wiring chamber cover for maintenance while live underground to ensure safe operation.

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