national standard swing check valve
I. Structural Features of National Standard Swing Check Valves
1. The product is designed and manufactured in accordance with the national standard GB/T 12236, featuring a reasonable structure, reliable sealing and excellent performance.
2. The sealing surfaces of the disc and seat are surfaced with iron-based alloy or stellite cobalt-based hard alloy, which are wear-resistant, high-temperature resistant, corrosion-resistant, have good scratch resistance and long service life.
3. Various piping flange standards and flange sealing surface types can be adopted to meet various engineering needs and user requirements.
4. The valve body materials are available in various types, and the gaskets can be reasonably selected according to the actual working conditions or user requirements, making it applicable to various pressure, temperature and medium working conditions.
5. The disc rotates around the pin outside the seat, reducing violent impact during closing.
6. The pin shaft is connected to the disc with an internal structure, eliminating external leakage points and ensuring more reliable operation.
II. Standards and Specifications of National Standard Swing Check Valves
Nominal Pressure PN (MPa): 1.6~16
Shell Strength Test Pressure: 1.5 times the nominal pressure at normal temperature
High Pressure Seal Test Pressure (MPa): 1.1 times the nominal pressure at normal temperature
Working Pressure at Normal Temperature (MPa): ≤1.6~≤16
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