1. Medium Characteristics
Petroleum media composition is complex, potentially containing crude oil, natural gas, water, and corrosive substances.
Weakly corrosive media: Carbon steel valves offer cost-effectiveness with high strength and machinability.
Highly corrosive media (e.g., H₂S/CO₂-rich): Stainless steel (e.g., 316L) provides superior corrosion resistance to prolong service life.
2. Temperature & Pressure Conditions
High-T/High-P environments: Alloy steels (e.g., chromium-molybdenum alloy) maintain strength/ductility under extreme conditions (common in steam/petroleum pipelines).
Cryogenic environments: Low-temperature carbon steel prevents brittle fracture.
3. Cost Considerations
Non-critical applications: Standard materials suffice.
Critical systems: High-performance materials (despite higher costs) ensure reliability.
4. Valve Type & Operational Frequency
Material selection must account for:
Valve type-specific requirements
Wear/fatigue resistance for high-cycle applications.
