Function of explosion proof solenoid valve and classification of explosion proof grade

The coil shell of explosion-proof solenoid valve not only has the function of explosion-proof to bear the pressure of gas explosion, but also has the function of blocking the energy transmission of gas explosion, with higher safety performance. It is a series of special solenoid valves specially designed for transmitting inflammable and explosive media or used in explosive dangerous places. Solenoid valves with different explosion-proof grades should be selected for different environments and fluids.

China's explosion-proof grade standard is "gb3836.1-2000 electrical equipment for explosive gas environment", which will be supplemented or modified by the following special standards for explosion-proof types.

It can be divided into: flameproof type "d", "increased safety type" e ", intrinsically safe type" I ", positive pressure type" P ", oil filled type" O ", sand filled type" Q ", pouring type" m ", and GB 7957 mine safety helmet lamp.

The above standards and this standard are not applicable to medical electrical equipment, detonator, detonator tester and ignition circuit tester

The common symbol is "Exd Ⅰ / Ⅱ BT3", "ex" is the general symbol, which means explosive, "d" means that the secondary explosion-proof type is "flameproof D".

"I" or "II" refers to the classification of electrical equipment. I refers to the electrical equipment for coal mine, and II refers to the equipment for explosive gas environment except for coal mine. Among them, class II explosion-proof "d" and intrinsically safe "I" electrical equipment are divided into class IIa, class IIb and class IIC

"T3" indicates the temperature group.