The valve body, valve cover and disc material type is introduced

Many different kinds of valves, used in different medium, material selection of the valve is different also, body, cover and disc are main parts, the valve directly under medium pressure, materials used must meet & other; The valve of pressure and temperature rating & throughout; The provisions of the. Commonly used materials have the following kinds: 1, the carbon steel is suitable for the nominal pressure PN≤ 32. 0 mpa, the temperature was minus 30 ~ 425 ℃ water, steam, air, hydrogen, ammonia, nitrogen and oil products such as medium. Commonly used brand: WC1, WCB, ZG25 and high-quality steel 20, 25, 30, and low alloy structural steel, 16 mn. 2, copper alloy is suitable for PN≤ 2. 5 mpa air, water, oxygen, water, oil and other medium, as well as steam medium temperature - 40 ~ 250 ℃. Commonly used brand: ZGnSn10Zn2 ( Tin bronze) 、H62 Hpb59— 1 ( Brass) QAZ19— 2、QA19— 4 ( Aluminum bronze) 。 3, high temperature copper is suitable for the nominal pressure PN≤ 17. 0 mpa, temperature & le; 570 ℃ steam and oil products. Commonly used brand: ZGCr5Mo, 1 cr5m0 ZG20CrMoV, ZG15Gr1Mo1V, 12 crmov WC6, WC9, etc. 4, low temperature steel is suitable for the nominal pressure PN≤ 6. 4 mpa, temperature & ge; — 196 ℃ ethylene, propylene, liquefied natural gas, liquid nitrogen, etc. Commonly used brand: ZG1Cr18Ni9; 0Cr18Ni9； 1Cr18Ni9Ti； ZG0Cr18Ni95, acid-proof stainless steel is suitable for the nominal pressure PN≤ 6. 4 mpa, temperature & le; 200 ℃ nitric acid, acetic acid, etc. Commonly used brand: ZG0Cr18Ni9Ti ZG0Cr18Ni10 & lt; Nitric acid resistant & gt; ; ZG0Cr18Ni12Mo2Ti ZG1Cr18Ni12Mo2Ti < Acid and urea & gt; 6, gray cast iron, gray cast iron is suitable for the nominal pressure PN≤ 1. 0 mpa, the temperature was minus 10 ℃ ~ 200 ℃ water, steam, air, gas, oil medium, etc. Gray cast iron used brand: HT200, HT250, HT300 and HT350. 7, malleable cast iron used for nominal pressure PN≤ 2. 5 mpa, the temperature was minus 30 ~ 300 ℃ water, steam, air and oil medium. Commonly used brand: KTH300 & ndash; 06年,KTH330— 08年,KTH350— 10. 8, ductile cast iron is suitable for PN≤ 4. 0 mpa, the temperature was minus 30 ~ 350 ℃ water, steam, air, oil medium, etc. Commonly used brand: QT400 & ndash; 15日,QT450— 10、QT500— 7. 9, acid of high silicon ductile iron is suitable for the nominal pressure PN≤ 0. 25 mpa, corrosion medium temperature below 120 ℃.