- pneumatic butterfly valve Chemical pneumatic valve material selection

for a long time, corruption is the top killer of chemical equipment, often damage the equipment, and even cause serious accident. According to statistics, about sixty percent of the chemical equipment damage is caused by a corrupt, so in choosing a chemical pneumatic valves should first pay attention to the applicability of the pneumatic valve materials. Below is a list of some common used to deal with corrupt media material.
and strong sulfuric acid as a corrupt one of medium, sulfuric acid is a major industry raw material use is very widespread. Differences of sulphuric acid concentration and temperature of data corruption and differences, for concentration in % above, temperature less than ℃ concentrated sulfuric acid, carbon steel and cast iron has good corrosion resistance, but it does not fit the activities of sulfuric acid, not practical for pump pneumatic valve data; The material of popular stainless steel such as chemical pneumatic valve selection ( CrNi） 、（ CrNiMoTi） Also has limited usefulness for sulphuric acid medium. Based on pneumatic conveying of sulfuric acid pump valve all adopt high silicon cast iron ( Forging and machining is difficult) , high alloy stainless steel, Alloy) Production. Function of fluorine plastic has good resistance to sulfate, adopt pneumatic valve fluorine-butterfly is a more economical choice ( zé。
organic acid, acetic acid, it is the one of the strongest material decay resistance, popular steel city in all of acetic acid concentration and temperature, Hui, serious corruption, excellent resistance to acetic acid is stainless steel materials, stainless steel containing molybdenum can also practical in high docile dilute acetic acid steam. For high temperature and high concentration of acetic acid or contain other corruption medium such as mean request, can choose high alloy stainless steel pneumatic valves or fluorine plastic air valve.
should greatly, hydrochloric acid are metal materials are not resistant to decay (hydrochloric acid Includes data on all kinds of stainless steel) And high molybdenum silicon also can only be used for ℃, % the following hydrochloric acid. And metal materials contrary, most of the non-metallic materials of hydrochloric acid has excellent resistance to decay, so lined with rubber pneumatic valves and plastic air valve ( Such as polypropylene ( CH, fluorine plastic, etc. ) Is the best choice of transportation hydrochloride.
and general metal nitrate most damaged by the agile corrupt in nitric acid, the stainless steel is the most widely used nitric acid resistant material, all to room temperature the concentration of nitric acid has excellent corrosion resistance, it is worth mentioning the molybdenum stainless steel ( Such as, L) For nitric acid corrosion resistance not only is better than that of common stainless steel ( Such as, And sometimes not. For the high-temperature nitric acid, who take the titanium and titanium alloy materials.
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