Our advantage fully welded ball valve,automatic recirculation valve supplier - Edvc Valve

Aluminum Bronze Ball Valve

The safety and reliability of the valve is closely related to the material selected. The valve body, bonnet and gate (valve disc) are one of the main parts of the valve, which directly bear the medium pressure. The materials used must have the ability to withstand the specified medium temperature and pressure. Achieved mechanical properties and good cold and hot processing manufacturability.
The material of the valve operating in corrosive medium should be resistant to corrosion: the valve working under high temperature and high pressure should have high thermal strength, high toughness and low temper brittleness: in the coal gasification and synthesis complex equipment Valves and valves in ethylene complete devices should have excellent low temperature impact toughness, especially valves with low temperature and certain pressure, and must also have a certain ability to resist fracture and crack propagation.
Materials commonly used to manufacture valve bodies, bonnets and gates are as follows:
①Grey cast iron, suitable for water, steam, air, gas, oil and other media with nominal pressure ≤ PN10 and temperature of -10℃~200℃. Grey cast iron material can also be used for the nominal pressure of PN16 MPa for globe valves and lift check valves of ≤DN200. Common grades of gray cast iron are HT200, HT250, HT300, HT350.
② Malleable cast iron. Suitable for water, steam, air, oil and other media with nominal pressure ≤ PN25 and temperature of -29℃~300℃. Commonly used grades are KTH300-06, KTH330-08, KTH350-10.
③ Ductile iron, suitable for water, steam oil, air and oil with nominal pressure ≤ PN40 and temperature of -29℃~350℃. Commonly used grades are QT 400-18, QT400-15, QT 450-10, QT 500-7.
④Acid-resistant high-silicon ductile iron, suitable for corrosive media with nominal pressure ≤PN2.5 and temperature less than or equal to 120℃.
⑤Carbon steel, suitable for water, steam, air, hydrogen, ammonia, nitrogen and petroleum products with nominal pressure ≤ PN320 and temperature of -29℃~425℃, commonly used grades are WCA (ZG 205-415), WCB (ZG 250-485), WCC (ZG 275-485); high-quality carbon steel is 20, 25, 30, 35; low-alloy structural steel is 16Mn.
⑥Copper alloy, suitable for water, seawater, oxygen, air, oil and other media with nominal pressure ≤ PN25, and steam medium with temperature of -40℃~250℃. Commonly used grades are ZCuSn10Zn2 (tin bronze); H62, HPb59-1 (brass); QA19-2, QA19-4 (aluminum bronze)
⑦ High temperature steel, suitable for steam and petroleum products with nominal pressure ≤ PN160 and temperature less than or equal to 550 ℃ ), 12Cr1MolV, 12Cr1MoVA (chrome molybdenum vanadium steel), WC1, WC6, WC9.
⑧ Low temperature steel, suitable for ethylene, propylene, liquid natural gas, liquid nitrogen and other media with nominal pressure ≤ PN63 and temperature greater than or equal to -196℃. Commonly used grades are ZG0Cr18N9, ZG1Cr18N9, ZG0Cr18N9T, ZGICr18N9T (austenitic stainless cast steel); 06Cr19Ni10, 12Cr18Ni9, 06Cr19N10, 12Cr18Ni9T (austenitic stainless steel).
⑨Stainless acid-resistant steel, suitable for nitric acid with nominal pressure