The role of the gas valve in chemical production, the reaction kettle for heating and cooling is often done. In this process, because the temperature of the reaction kettle exceeds the allowable limit temperature, it is necessary to stop the kettle to cool down. When the reaction kettle suddenly stops cooling, there will be a part of the material will be due to the role of pressure from the container, the occurrence of safety accidents. This kind of accident is also common in industrial production. Now introduce a device that can ensure that safety accidents do not occur-breathable reading. When the reaction kettle to stop heating, because the pressure is reduced to a certain extent, the material will be rushed out of the container, and will not cause an accident. The vent valve is a one-way valve installed in the pipeline between the reactor and the storage tank. Due to the presence of gas between the reaction kettle and the storage tank, the temperature of the material is reduced. When the reaction kettle stops heating or cooling, the gas will be rushed out of the reaction kettle without causing an accident. When the reaction kettle continues to heat, the heating or cooling will be stopped due to the increase in pressure to a certain extent. At this time, if the gas is discharged from the reaction kettle, an accident will occur.

In the chemical production of the use of ventilation valve should pay attention to the following points:
1 must ensure that the air valve is not subject to medium corrosion and blockage: because the air valve is a one-way valve, the medium from one end to the other end can not be returned; if the medium in the vent valve corrosion or blockage phenomenon, will make it unable to work properly.
2. It must be ensured that the ventilation is not affected by other factors after opening: external factors such as dust, gas or steam can also cause the ventilation valve to not work properly. 3. must ensure that the vent valve in the use of the process does not occur blocking phenomenon: because it is a one-way valve, so when the phenomenon of blockage occurs only medium discharge, can not return; if the vent valve blockage occurs, not only the vent valve can not work, but also make a large number of materials due to high pressure from the vent valve and cause safety accidents. 4. Must ensure that the life of the vent valve is long enough: because it is a one-way valve, it can only be discharged from one end and cannot be returned when the blockage occurs; if the blockage is serious, it will cause the material in the whole reaction kettle to be unable to discharge and cause a safety accident.
5. It must be ensured that the ventilation valve is not damaged during operation: because it is a one-way door, once the ventilation valve is damaged, the materials in the whole reaction kettle cannot be discharged normally and safety accidents occur.