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How to choose pneumatic valve chemical material
by：AIRWOLF
2020-10-15
How to choose pneumatic valve chemical material?
for a long time, the corrosion is one of the serious problems in chemical equipment, light damage to the equipment, or lead to the accident, and even cause disaster. According to statistics, about 60% of the damage is caused by corrosion of chemical equipment, so in the chemical industry, in the selection of pneumatic valves must first pay attention to scientific choice. Here for some commonly used chemical media selected points discussed:
1. Sulfuric acid is a kind of strong corrosive medium, sulfuric acid is a kind of important industrial material, widely used. Different concentration and temperature of sulfuric acid corrosion differences of material is different, the concentration of more than 80%, less than 80 ℃ temperature of sulfuric acid, carbon steel and cast iron has good corrosion resistance, but it is not suitable for high-speed flow of sulfuric acid, is not used as a pump pneumatic valve materials; Ordinary stainless steel such as 304 ( 0CR18NI9) , 316 ( 0Cr18Ni12Mo2Ti) Used in sulphuric acid medium effect is limited. Therefore, transport of sulfuric acid pump pneumatic valve by the high silicon cast iron (usually Casting and machining is difficult) , high alloy stainless steel, 20th alloy) Is made. Fluorine plastic has good resistance to sulfur acid, the fluorine liner pneumatic valve is a kind of more economical choice.
2。 Acetic acid is one of the corrosive substance in organic acids, ordinary steel in all acetate concentration and temperature are subject to severe corrosion, stainless steel is a kind of good resistance to acetic acid and molybdenum 316 stainless steel can also be used to dilute acetic acid of high temperature steam. High temperature and high concentration of acetic acid and other corrosive medium, such as strict requirements, can choose high alloy stainless steel pneumatic valves or fluorine plastic air valve.
3。 Most metal materials don't resist the corrosion of hydrochloric acid (hydrochloric acid Including stainless steel) And high molybdenum ferrosilicon can only be used in 50 ℃, the concentration less than 30% of hydrochloric acid. In contrast to the metal materials, the vast majority of non-metallic materials of hydrochloric acid have good corrosion resistance, so the rubber lining pneumatic valve and plastic air valve ( Such as polypropylene, fluorine plastic, etc. ) Is the choice of transportation hydrochloride.
4。 General in nitric acid, nitric acid and corrosion damage, stainless steel is more commonly used nitric acid resistant material, nitric acid at room temperature with good corrosion resistance, it is worth mentioning that molybdenum stainless steel ( Such as 316, 316 l) Corrosion resistance of nitrate than ordinary stainless steel ( Such as 304, 321) Even worse, sometimes. For high-temperature nitric acid, usually use of titanium and titanium alloy materials.
chemical pneumatic valve materials exactly how to choose? Through the above introduction, you should know what chemical pneumatic valve materials to choose!
for a long time, the corrosion is one of the serious problems in chemical equipment, light damage to the equipment, or lead to the accident, and even cause disaster. According to statistics, about 60% of the damage is caused by corrosion of chemical equipment, so in the chemical industry, in the selection of pneumatic valves must first pay attention to scientific choice. Here for some commonly used chemical media selected points discussed:
1. Sulfuric acid is a kind of strong corrosive medium, sulfuric acid is a kind of important industrial material, widely used. Different concentration and temperature of sulfuric acid corrosion differences of material is different, the concentration of more than 80%, less than 80 ℃ temperature of sulfuric acid, carbon steel and cast iron has good corrosion resistance, but it is not suitable for high-speed flow of sulfuric acid, is not used as a pump pneumatic valve materials; Ordinary stainless steel such as 304 ( 0CR18NI9) , 316 ( 0Cr18Ni12Mo2Ti) Used in sulphuric acid medium effect is limited. Therefore, transport of sulfuric acid pump pneumatic valve by the high silicon cast iron (usually Casting and machining is difficult) , high alloy stainless steel, 20th alloy) Is made. Fluorine plastic has good resistance to sulfur acid, the fluorine liner pneumatic valve is a kind of more economical choice.
2。 Acetic acid is one of the corrosive substance in organic acids, ordinary steel in all acetate concentration and temperature are subject to severe corrosion, stainless steel is a kind of good resistance to acetic acid and molybdenum 316 stainless steel can also be used to dilute acetic acid of high temperature steam. High temperature and high concentration of acetic acid and other corrosive medium, such as strict requirements, can choose high alloy stainless steel pneumatic valves or fluorine plastic air valve.
3。 Most metal materials don't resist the corrosion of hydrochloric acid (hydrochloric acid Including stainless steel) And high molybdenum ferrosilicon can only be used in 50 ℃, the concentration less than 30% of hydrochloric acid. In contrast to the metal materials, the vast majority of non-metallic materials of hydrochloric acid have good corrosion resistance, so the rubber lining pneumatic valve and plastic air valve ( Such as polypropylene, fluorine plastic, etc. ) Is the choice of transportation hydrochloride.
4。 General in nitric acid, nitric acid and corrosion damage, stainless steel is more commonly used nitric acid resistant material, nitric acid at room temperature with good corrosion resistance, it is worth mentioning that molybdenum stainless steel ( Such as 316, 316 l) Corrosion resistance of nitrate than ordinary stainless steel ( Such as 304, 321) Even worse, sometimes. For high-temperature nitric acid, usually use of titanium and titanium alloy materials.
chemical pneumatic valve materials exactly how to choose? Through the above introduction, you should know what chemical pneumatic valve materials to choose!
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