R-BED cartridge double seal for process centrifugal pumps and mixers operating with abrasive, viscous and explosive liquids. Independent of the direction of shaft rotation, balanced, multi-spring. Requires the use of a barrier fluid system (according to API 52, API 55, API 53a, API 53b, API 53c, API 54 schemes). Application range - pressure up to 1.6 MPa (maximum buffer fluid pressure 2.0 MPa). Temperature - up to 200°C, sliding speed - up to 12.5 m/s.