The Industrial Valves body, Industrial Valves cover, and ram ( The disc) Is one of the main parts, valve directly under medium pressure, the material must comply with the 'Industrial Valves of the pressure and temperature rating'. Commonly used material has the following several: a, gray cast iron, grey cast iron is suitable for the nominal pressure PN 1 or less. 0 mpa, the temperature was minus 10 ℃ ~ 200 ℃ water, steam, air, gas, oil medium, etc. Gray cast iron used brand for HT200, HT250, HT300 and HT350. Second, malleable iron: suitable for nominal pressure PN 2 or less. 5 mpa, the temperature was minus 30 ~ 300 ℃ water, steam, air and oil medium, commonly used brand have: KTH300 - 06年,KTH330 - 08年,KTH350 - 10. Three, nodular cast iron: applicable to PN 4 or less. 0 mpa, the temperature was minus 30 ~ 350 ℃ water, steam, air, oil medium, etc. Commonly used brand have: QT400 - 15、QT450— 10、QT500 - 7. ( In view of the current domestic technology level, different GeChang, users are not easy to test. According to the experience, it is suggested that the PN 2 or less. 5 mpa, valves or steel valves for safety. ) Four, acid of high silicon ductile iron: suitable for nominal pressure PN 0 or less. 25 mpa, corrosion medium temperature below 120 ℃. Five, the carbon steel: suitable for nominal pressure PN acuities were 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. Six, copper alloy: suitable for PN 2 or less. 5 mpa air, water, oxygen, water, oil and other medium, as well as the temperature - 40 ~ 250 ℃ steam medium, commonly used brand for ZGnSn10Zn2 ( Tin bronze) 、H62 Hpb59 - 1 ( Brass) 、QAZ19— 2、QA19— 4 ( Aluminum bronze) 。 Seven, high temperature copper: suitable for nominal pressure PN 17 or less. 0 mpa, of the steam temperature of 570 ℃ or less and petroleum products. Commonly used brand ZGCr5Mo, 1 cr5m0. ZG20CrMoV ZG15Gr1Mo1V, 12 crmov WC6, WC9, etc. The body must be in accordance with the specific selection pressure and temperature of the norms. Eight, low temperature steel, is suitable for the nominal pressure PN 6 or less. 4 mpa, temperature or higher - 196 ℃ ethylene, propylene, liquid gas, liquid nitrogen, such as medium, commonly used brand) Have ZG1Cr18Ni9, 1 cr18ni9ti, ZG0Cr18Ni9 9, 0 cr18ni9, acid-proof stainless steel, is suitable for the nominal pressure PN 6 or less. 4 mpa, temperature of 200 ℃ or less nitric acid, acetic acid medium, such as common brands have ZG0Cr18Ni9Ti, ZG0Cr18Ni10, ZG0Cr18Ni12Mo2Ti, ZG1Cr18Ni12Mo2Ti
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os&y valve gate valve are used largely for resilient seated valve such as os&y gate valve.
There are different types of , mainly cast iron gate valve and resilient valve.