1. Pressure Rating
Follow ASME B16.34, common class 150~2500. Class 800 is an intermediate level, dedicated to instrument root valves and pressure pipe connection valves.
2. Valve Body Structure
Fully Welded Valve Body: used for buried pipelines, resistant to geological disasters (such as earthquakes, landslides), life of up to 30 years.
Split Valve Body: easy to maintain, bolted connection, but need to prevent pipeline stress from causing seal failure
3. End Connection
| Type |
Application |
Limited |
| BW |
High temperature and high pressure, highly toxic media (such as hydrogen sulfide working conditions) |
High cost, professional welding required |
| SW |
DN≤40 instrument valve |
Crevice corrosion media prohibited |
| NPT |
Low pressure non-hazardous substances |
DN≤20, seal welding is required to prevent leakage |
| RF/FF |
Easy to disassemble and assemble, Class150/300 commonly used RF |
FF is only used for cast iron valves |
Application of API Valves
API Valve Pressure Rating and Structural Design
Introduction to API Globe Valve
API 623 Standard
API valve maintenance points
API Butterfly Valve Sealing Form
What are the technical requirements of API valves?