Valves play an important role in the chemical industry. They are the main components of flow control systems and are widely used in material transportation, pressure control, safety and other aspects. Due to the high temperature, high pressure, corrosivity, flammability, and explosiveness of chemical media, the selection and use of valves must strictly meet the working conditions. The following are the main applications and key considerations for valves in the chemical industry:
Main Factors for Choosing Chemical Valves
1. Characteristics of the environment
Corrosive: Choose valves made of stainless steel (316L), nickel-based alloy (Hastelloy C276) or fluorinated lining.
Solids: Use wear-resistant ceramic coated valves or knife gate valves.
2. Temperature and Pressure
High temperature (>500°C): Requires a metal solid seal heat dissipation design (such as an extended valve cover).
Ultra-high pressure (such as hydrogenation reactor): Choose forged valve body self-tightening seal.
3. Safety Standards
Explosion Protection Certification: ATEX (EU), IECEx (International).
Leakage Rate: API 598 (Zero Leakage Requires Strict Operating Conditions).
4. Special needs
Sterile environment (e.g., biochemical industry): Sanitary valve (polished Ra≤0.8 μm).
Low temperature (e.g. CNG): Cryogenic valve (austenitic stainless steel at -196°C).
Maintenance and prevention
Regular inspection: sealing surface wear, valve stem corrosion (especially in chlorinated environments).
Cleaning Strategy: Avoid cleaning polytetrafluoroethylene (PTFE) valves with organic solvents.
Spare parts management: inventory of vulnerable parts (such as valve seats, gaskets).
Chemical valves are key equipment to ensure the safety and efficiency of production. When choosing, it is necessary to comprehensively consider factors such as environment, pressure, temperature, and corrosivity, and follow international standards (such as API, ASME). In the future, with the development of intelligence and new material technologies, valves will evolve towards higher reliability and lower energy consumption.
