This seal withstands -45℃-200℃ temperature, over 2.0Mpa pressure, in 15m/s speed or over. The series V1,Q1,Q2,U2,U1 are stationary, A,B,Q1,Q2,U2 are rotary and V,P and E are secondary seal. It has a standard G9 and G6, G4, and G50 alternative seat types and is ideal for petroleum, chemical and oil refinery fields.