The five kinds of common explosion-proof solenoid valves
Explosion-proof solenoid valve shell can withstand any shell joint surface or structure clearance, infiltrate into the inside of the shell of combustible mixture in the internal explosion damaged, and not caused by outside a gas or vapor formation of explosive environment, a variety of light, the temperature may produce a spark, arc and dangerous parts are in the explosion-proof enclosure, explosion-proof enclosure equipment internal space and the surrounding environment. Explosion-proof enclosure there is gap, for electrical equipment for respiration and gas osmosis, make internal possible explosive gas mixture. Common explosion-proof solenoid valve is mainly five categories: so this Ann model: the equipment under the conditions stipulated in the internal circuit, normal or fault conditions stipulated in the work of edm and thermal effect are not ignite an explosive mixture. Flameproof: equipment in normal operation, can produce sparks arc parts in explosion-proof enclosure, the explosion of the flame-proof shell can withstand the internal pressure without damage, and can guarantee the internal flame gas travels through the gap, energy reduction, not detonate gas outside the shell. Positive pressure type: maintain internal protective gas pressure is higher than the surrounding pressure to avoid explosive mixture into a shell or adequate protective gas through the shell, make internal explosive mixture concentration was lowered to below the lower explosive limit. Increased safety type: in normal operation does not produce high temperature arc, spark and danger, further protection measures on structure, improve the security and reliability of the equipment. Encapsulation type: it will probably have to ignite an explosive mixture of arc, spark or high temperature part of the encapsulation, that it cannot ignite surrounding explosive mixture.