Natural oxidation and corrosion of the valve stem

Natural oxidation and corrosion of the valve stem, because the surface of the valve stem packing is oxidized, and ferroferric oxide (rust) is formed, which will cause the valve stem to become thin and cause leakage; For example, the use temperature of pure PTFE must be 150℃, filled with PTFE250℃, and PTFE particle filler The compensation performance is poor, and it is only suitable for low-pressure valves, PTFE fiber, carbon fiber or the mixed filler of the two, and the price is too high to be unfavorable for promotion.

A valve that relies on exteal force to rotate and drive to open and close is designed with a sealing device that is used to install a certain number of packing seals in the packing culvert to achieve a sealing effect, but how about the sealing? Leakage at the PTFE fiberglass fabric high temperature cloth packing of the valve is one of the most prone to leakage failure in the valve, but there are roughly two reasons for it.

Synthetic resins and synthetic fibers, some of these products are restricted in the scope of use. Corrosion problems can also be caused by one aspect., serious threats to personal safety, property safety and environmental pollution accidents. Asbestos, because the asbestos material has chloride ions that corrode the valve stem, and the asbestos contains carcinogens, which are harmful to human health.

The country has banned or seldom used the parts of the product; 2. Expanded graphite will cause severe electrochemical corrosion. If the water valve leaks, it will lead to serious consequences, such as poisonous, harmful, flammable, explosive and Corrosive media leakage, etc. Reasons for fillers The main fillers currently used are:  Corrosion situations include: 1.Valve leakage is very common in life and production, and it will cause waste or danger to life at the slightest. Leakage caused by chloride ion corrosion of asbestos packing;