Classification of explosion-proof solenoid valve common types of explosion-proof solenoid valve

The principle and application of explosion-proof solenoid valve are introduced

The shell of the explosion-proof solenoid valve can withstand the internal explosion of combustible mixture penetrating into the shell through any joint surface or structural gap of the shell without damage, and will not cause the ignition of the explosive environment formed by one or more gases or vapors outside. The parts that may produce sparks, arc and dangerous temperature are put into the explosion-proof shell, The flameproof enclosure separates the internal space of the equipment from the surrounding environment. There is a gap in the flameproof enclosure, and there may be explosive gas mixture in the enclosure due to the breathing and gas penetration of electrical equipment.

Classification of common explosion-proof solenoid valves:

1. Increased safety type: during normal operation, there will be no arc, spark and low temperature risk, and the structure will be further refined to further increase the safety and reliability of the equipment;

2. Flameproof type: when the setting equipment is in normal operation, it can make the parts that may have spark arc placed in the flameproof shell, which can accept the external explosion pressure without damage, and can ensure that the energy is reduced when the external flame gas flows through the gap, so as to isolate and avoid the gas outside the shell.

3. Intrinsically safe type: set up the external circuit of the equipment. Under the premise of rules, the electric spark and thermal effect generated under normal events or regular fault patterns can not extinguish explosive confusions.

4. Positive pressure type: insist that the pressure of external maintenance gas is higher than the surrounding pressure, so as to prevent explosive mixture from entering the shell or sufficient maintenance gas from passing through the shell, so that the concentration of external explosive mixture can be reduced below the upper explosion limit.

5. Pouring type: the part that may produce arc, spark or high temperature to ignite the explosive mixture is poured, so that it cannot ignite the surrounding explosive mixture.