The WB2 （Type 152 ）PTFE bellows mechanical seal is a single-end, balanced external mechanical seal designed for acid proof pumps, plastic pumps, alkali pumps, and vacuum equipment and other rotating equipment. It is also available as a replacement for John Crane WB2 mechanical seals.
The seal uses a PTFE bellows for reliable pressure compensation at the sealing faces. Its bellows transmission design helps reduce the influence of shaft radial runout. This improves the adaptability and floating performance of the rotating ring during operation.
WB2 Mechanical Seal Structural Features
The WB2 mechanical seal features a simple and reliable structure for easy installation and maintenance.
- Single-end and balanced mechanical seal design
- PTFE bellows for chemical resistance
- External-mounted seal construction
- Independent direction of rotation
- Bellows transmission
- Pressure compensation through the PTFE bellows
- Improved rotating ring adaptability
- Reduced influence of shaft radial runout
- Simple installation and maintenance
The balanced design helps reduce the hydraulic load on the seal faces. The PTFE bellows also provides flexible compensation during operation.
Applications of PTFE Bellows Mechanical Seal
The WB2 pump seal is suitable for equipment handling corrosive liquids and chemically aggressive media. Typical applications include:
- Acid-proof pumps
- Plastic pumps
- Alkali pumps
- Chemical process pumps
- Vacuum equipment
- Other rotary equipment
Its PTFE bellows construction makes the seal suitable for applications where chemical resistance is important.
John Crane WB2 Mechanical Seal Replacement
The WB2 （Type 152） PTFE bellows mechanical seal can be used as a replacement for the John Crane WB2 in suitable pump applications. The replacement should be confirmed according to shaft size, seal chamber dimensions, operating pressure, temperature, speed, and process medium.
