Recommended applications
Centrifugal pumps, screw pumps and other special pumps. Toxic, harmful, flammable medium. 
Product features
● API 682 Category 2 and 3, Type A, Arrangement 2 seal
● Face to back, multiple springs, balanced, cartridge seal
● Inboard seal as primary seal, outboard seal as safety seal
● Outboard seal gas-lubricated, non-contacting, wear-free operation, long life, self-adjusting
● Inboard seal double balanced designs for reverse pressure
● Inert gas or gas compatible with the medium as buffer gas between inboard and outboard seals
● Zero leakage, zero emissons, no environmental pollution
● Cartridge designs to allow easy installation and maintenace
● Modular designs allowing easy part replacement, low maintenance cost
Operating limits
● Pressure: 0~40bar
● Temperature: -40~176℃（260℃）
● Sliding velocity: ≤25m/s
● Shaft diameter: 20~110mm