Type 551 is a single-end, unbalanced mechanical seal with a conical spring and dependent rotation direction. The spring-driven design provides reliable axial compensation and stable sealing performance.
Its compact structure makes the Type 551 easy to install and suitable for various standard pump applications. The seal offers good compatibility with different operating conditions and supports stable operation in demanding services.
Type 551 is widely used as a water pump seal for water pumps, temperature control pumps, vacuum pumps, and heat-transfer oil pumps. It is commonly applied in leather processing, wastewater treatment, plastics processing, and food machinery.
This mechanical seal can be used as a direct replacement for equivalent John Crane Type 551 and EagleBurgmann BT-RN mechanical seals, subject to matching shaft size, operating conditions, and installation dimensions.
Key Features:
- Single-end and unbalanced design
- Conical spring with dependent rotation direction
- Spring-driven transmission
- Compact structure for easy installation
- Stable spring compensation
- Suitable for water, vacuum, temperature-control, and heat-transfer oil pump
- Replacement for John Crane Type 551 and EagleBurgmann BT-RN
