John Crane Type 21
The Type 21 is an all purpose seal which rotates with the shaft against a stationary mating face. The Type 21 features mechanically crimped components eliminating the use of adhesives. We have many sizes and material configurations for engineers to choose from.
Materials configuration:
- Stationary Ring (Alumina 99%/Alumina 99.5%/SiC/SSiC/TC)
- Rotary Ring (Carbon/SiC/SSiC/TC)
- Secondary Seal (NBR/EPDM/Viton)
- Spring and Punched Parts (SS304/SS316)
Working conditions:
- Mediums: Water, oil, and chemical mediums with weak corrosion
- Temperature: -20°C~150°C
- Pressure: ≤0.8MPa
- Speed: ≤ 10 m/Sec
