Valve leakage and sealing technology

Valve leakage in life, the production is widespread, ranging from lead to waste, or dangerous to life, such as the water valve leakage, the case can lead to serious consequences from occurring, such as the chemical industry's toxic, hazardous, flammable, easy to mediated nature of the explosion and leakage of corrosive and so on, a serious threat to personal safety, property safety and environmental pollution accidents. External rotation on a drive to open and close the valve are designed to have a seal not only used in the Han-Zhong Zhuang fill a certain amount of filler on the seals, as well as achieve the sealing effect, but the situation on how to seal it? The valve is a valve packing leak and the most prone to leakage faults in the site of one, but the reason there are basically two reasons.

     1, packing reasons.

     Fill is now mainly used are:

     1. Asbestos, due to the existence of asbestos materials, corrosive chloride ions on the stem, while asbestos, carcinogenic substances harmful to human health, the state has taken on the part of products banned or less use;

     2. Synthetic resins and synthetic fibers category, and some in the use of such products is subject to restrictions, such as the use of pure PTFE temperature must be ≤ 150 ℃, filled PTFE ≤ 250 ℃, PTFE particles packing compensation performance worse, it only applies to low-pressure valves, PTFE fibers, carbon fiber, or both mixed filler, and the price is too high, the negative extension;

     3. Expanded graphite, the electrochemical corrosion will be severe.

     Second, the amount of a corrosion problem reasons.

     Corrosion are:

     1. Stem natural oxidation corrosion, due to valve stem packing at the table being oxidized to produce four oxidation of three iron (rust), after falling, resulting in stem thinning, caused by leakage;

     2. Asbestos packing leakage caused by corrosion of chloride ions;

     3. Graphite packing pairs of stainless steel corrosion;

     4. Media on the stem of the corrosion and so on. 

  

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