Common five types of explosion-proof solenoid valves
May 28, 2021
The shell of the explosion-proof solenoid valve can withstand any joint surface or structural gap of the shell, and the flammable mixture that penetrates into the shell will explode inside without being damaged, and will not cause an external explosive environment formed by one or more gases or vapors. Ignite, put the parts that may generate sparks, arcs and dangerous temperatures into the flameproof enclosure. The flameproof enclosure separates the internal space of the equipment from the surrounding environment. There is a gap in the explosion-proof enclosure. Due to the respiration and gas penetration of electrical equipment, there may be an explosive gas mixture inside.
Common explosion-proof solenoid valves are mainly of five categories:
1. Increased safety type: Arc, sparks and risky low temperatures will not occur during normal operation, and further maintenance steps are adopted in the structure to improve the safety and reliability of the equipment.
2. Explosion-proof type: When the equipment is set up in normal operation, the parts that can generate sparks and arcs are placed in the flameproof enclosure. The flameproof enclosure can accept the external explosion pressure without being damaged, and can ensure that the external flame gas passes through When the gap flows, the energy is reduced, and there is a lack of gas to detonate the shell.
3. Intrinsically safe type: setting the external circuit of the equipment, under the premise of the rules, the electric spark and the thermal effect generated under normal things or regular fault conditions can not extinguish explosive contaminants.
4. Positive pressure type: insist that the pressure of the external maintenance gas is higher than the surrounding pressure to prevent explosive mixtures from entering the shell or sufficient maintenance gas to pass through the shell to reduce the concentration of external explosive mixtures below the upper explosion limit.
5. Pouring type: It encapsulates the part that may produce arcs, sparks or high temperature that ignite the explosive mixture, so that it cannot ignite the surrounding explosive mixture.
