'Explosion-proof solenoid valve' explosive-proof grade standard is what?

'Explosion-proof solenoid valve' explosive-proof grade standard is what? Level of explosion-proof explosion-proof solenoid electromagnetic valve research and development department of China explosion-proof solenoid valve explosive-proof grade standard is 'GB. Electrical equipments used in explosive gas environment ', the standard will be added or modified by the following special explosion-proof type standard. GB。 Electrical equipments used in explosive gas environment, the first part of the flameproof 'd' GB. Electrical equipments used in explosive gas environment, the first part of the increased safety type 'e' GB. Electrical equipments used in explosive gas environment in the first part of the intrinsically safe 'I' GB. Electrical equipments used in explosive gas environment, the first part is pressed 'p' GB. Electrical equipments used in explosive gas environment in the first part of the oil filled type 'O' GB. Electrical equipments used in explosive gas environment the first part of the sand mold filling 'q' GB. Electrical equipments used in explosive gas environment, the first part of the encapsulation type 'm' GB for mine safety helmet lamp above standard and this standard does not apply to medical electrical equipment, blasting, blasting machine tester and ignition circuit tester, as you mentioned 'EXDB', I really haven't seen you like standard, suspected you copied this type or symbol. Common symbol for 'Exd Ⅰ/Ⅱ BT' 'Ex' for common symbols, said explosive 'd' said time is explosion-proof type 'flameproof d'. 'Ⅰ' or 'Ⅱ said electrical equipment classification, Ⅰ for coal mine electrical equipment, Ⅱ for explosive gas environment with other equipment in addition to the coal mine. , flameproof Ⅱ class 'd' and 'I' intrinsically safe electrical equipment is divided into Ⅱ A, Ⅱ Ⅱ C and B. 'T' group said temperature.