What materials are butterfly valves made of?
Release time:
2025-07-17 08:59
The commonly used materials for butterfly valves include the following:
Gray cast iron
Gray cast iron is suitable for media such as water, steam, air, gas, and oil products with a nominal pressure PN ≤ 1.0 MPa and temperatures ranging from -10℃ to 200℃.
Common grades of gray cast iron: HT200, HT250, HT300, HT350.
Malleable cast iron
Suitable for media such as water, steam, air, and oil products with a nominal pressure PN ≤ 2.5 MPa and temperatures ranging from -30 to 300℃.
Common grades: KTH300—06, KTH330—08, KTH350—10.
Acid-resistant high-silicon ductile iron
Suitable for corrosive media with a nominal pressure PN ≤ 0.25 MPa and temperatures below 120℃.
Carbon steel
Suitable for media such as water, steam, air, hydrogen, ammonia, nitrogen, and petroleum products, with a nominal pressure PN ≤ 32.0 MPa and temperatures ranging from -30 to 425℃.
Common grades: WC1, WCB, ZG25, and high-quality steels 20, 25, 30, as well as low-alloy structural steel 16Mn.
Copper alloy
Suitable for media such as water, seawater, oxygen, air, and oil products with PN ≤ 2.5 MPa, as well as steam media with temperatures ranging from -40°C to 250°C.
Common grades: ZGnSn10Zn2 (tin bronze), H62, Hpb59—1 (brass), QAZ19—2, QA19—4 (aluminum bronze).
High-temperature copper
Suitable for steam and petroleum products with a nominal pressure PN ≤ 17.0 MPa and a temperature ≤ 570℃.
Common grades: ZGCr5Mo, 1Cr5Mo, ZG20CrMoV, ZG15Gr1Mo1V, 12CrMoV, WC6, WC9, and others.
Low-temperature steel
Suitable for media such as ethylene, propylene, liquefied natural gas, liquid nitrogen, and others with a nominal pressure PN ≤ 6.4 MPa and a temperature ≥ -196℃.
Common grades: ZG1Cr18Ni9, 0Cr18Ni9, 1Cr18Ni9Ti, ZG0Cr18Ni9.
Stainless acid-resistant steel
Suitable for media such as nitric acid and acetic acid with a nominal pressure PN ≤ 6.4 MPa and a temperature ≤ 200℃.
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