For the danger of valve flash explosion, preventive measures must be kept in mind

The danger of valve flash explosion cannot be ignored, especially when it involves flammable and explosive media, high temperature and high pressure working conditions or static sensitive environments. Once a flash explosion occurs, it may cause casualties, equipment damage or even major accidents.

1. Common causes of valve flash explosion:
1) Static electricity accumulation and discharge: Static electricity is generated by friction with the medium during the opening or closing of the valve. If it is not effectively released, it may cause discharge and explosion.
2) Air mixing in flammable media: The pipeline is not completely exhausted, and air and combustible gas mix to form explosive gas.
3) Overheating of sealing materials or inner wall surfaces of valves due to friction: The moving parts are heated by friction due to lack of lubrication or manufacturing defects, causing sparks or local high temperatures.
4) Abnormal valve structure/failure: The ball is stuck, the sealing pair is damaged, and the operating error causes instantaneous pressure release and flash explosion.
5) Sudden temperature or pressure fluctuations: Rapid opening and closing, sudden changes in the state of the medium (such as vaporization) may also cause instantaneous impact and explosion.

Some possible hazards
1. casualties
Valve flash explosion generated by the powerful shock waves and flying debris may cause serious injury to nearby operators, and even life-threatening. For example, the fragments
generated by the explosion may hit the human body, resulting in cutting injuries, puncture wounds, etc.; shock waves may cause personnel to be thrown up, hit the surrounding
objects, resulting in fractures, craniocerebral injuries, etc..
2. Equipment damage
Flash explosion will cause serious damage to the valve and the surrounding pipelines and equipment. Valves may be blown up, damaged, resulting in pipeline rupture, leakage,
further triggering a larger accident. For example, the flash explosion may cause damage to the sealing structure of the valve, so that the pipeline fluid leakage, pollution of the
environment, or even cause a fire or explosion.
3. Production interruption
Valve flash explosion often leads to the interruption of the production system, bringing huge economic losses to the enterprise. Repair of damaged equipment and pipelines
require time and money, at the same time, production interruption may also affect the upstream and downstream production links, resulting in a chain reaction.

Some relevant defensive measures
1. Prevent combustible gas leakage
Ensure that valves have good sealing performance, conduct regular inspections and maintenance, and replace damaged seals in a timely manner.
Carry out pressure test and leakage detection on piping system, and find and repair the leakage point in time.
2. Static electricity protection
In the piping system for transporting flammable and explosive fluids, install static grounding devices to ensure that static electricity can be conducted away in time.
Control the flow rate of the fluid to reduce the generation of static electricity.
3. Eliminate ignition sources
Strictly control the ignition sources around the valve, prohibit smoking, use of open flames or operations that may produce sparks in the flammable and explosive areas.
Explosion-proof design and installation of electrical equipment to prevent electrical sparks caused by flash explosions.
4. Good ventilation
Ensure that the space where the valve is located is well ventilated, remove the leakage of combustible gases in a timely manner to reduce the concentration of combustible gases.
In places where combutible gas may accumulate, install combustible gas detection and alarm devices to detect dangerous situations and take measures in time.
5.Training and Emergency Management
Conduct safety training for operators to improve their safety awareness and emergency handling ability.
Formulate a perfect emergency plan and conduct regular drils to ensure that emergency response can be carried out quickly and effectively in the event of a flash explosion
accident.