This double mechanical seal is a back-to-back cartridge-type design equipped with an independent barrier fluid system. It is engineered for demanding applications involving hazardous, toxic, or volatile media, especially where pressure fluctuations, vacuum conditions, or high safety requirements are present. The structure provides excellent reliability, high-pressure resistance, and stable sealing performance under extreme operating conditions.
Structural Characteristics
- Back-to-back dual seal face arrangement with independent barrier (isolation) fluid
- Capable of withstanding reverse pressure, pressure fluctuations, and vacuum conditions
- Dual-balanced sealing structure on the inner side for enhanced stability
- Multi-spring cartridge design ensures uniform load distribution
- Spring-rotating configuration for improved adaptability and sealing performance
- Convex lug drive transmission for reliable torque transfer
- Self-circulating barrier fluid system ensures continuous lubrication and cooling
Operating Parameters
- Temperature range: -40°C to 260°C (depending on material selection)
- Pressure range: -0.1 to 5.0 MPa
- Speed: up to 3600 RPM or 2.5 m/s
- Flushing plans: API Plan 53A / 53B / 53C
- Standard compliance: API 682, JB/T 4127.1
Product Description
- Back-to-back double seal design for hazardous and fluctuating pressure media
- Suitable for applications requiring vacuum resistance and high safety performance
- Complies with API 682 Arrangement 3CW-BB sealing configuration
- High-pressure resistant structure ensures stable operation under severe working conditions
- Reliable barrier fluid system enhances sealing safety and extends service life
Application Equipment
- Refining and hydrogenation unit hot oil circulation centrifugal pumps
- Hydrogenation feed pumps
- Amine circulation pumps in desulfurization units
- Other types of rotating equipment requiring high-reliability sealing solutions
