The differences between national standard gate valves and American standard gate valves mainly lie in the following aspects:
1. Different execution standards: The national standard gate valve follows the GB/T12234 standard, while the American standard gate valve mainly follows the API standard.
2. Different structural designs: National standard gate valves generally use bolt connections, while most American standard gate valves use flange connections. The sealing surface of the national standard gate valve is an iron gasket, while that of the American standard gate valve is a stainless steel gasket.
3. Different size standards: The nominal pressure range of national standard gate valves is relatively small, generally ranging from PN16 to PN64, while that of American standard gate valves is larger, typically from Class150 to Class2500. Meanwhile, the size of American standard gate valves is also relatively large, generally over 2 inches, while the size range of Chinese standard gate valves is wider.
4. Different market demands: As the international market pays more attention to the standards of the United States and Europe, the demand for American standard gate valves in the international market is relatively large, while Chinese standard gate valves are mainly applied in the domestic market.
