Drive Unit with Bellow Seal

Drive Unit with Bellow Seal

The Drive Unit with Bellow Seal is engineered for leak-tight agitation in glass reactors and vessels, where flexibility, chemical resistance, and glass protection are essential. The bellow seal compensates for axial shaft movement, thermal expansion, and minor misalignment, preventing direct mechanical stress on the glass flange and vessel neck.

This drive unit is ideally suited for laboratory, pilot-scale, and small industrial process systems operating under low to moderate pressure conditions.

The assembly consists of a drive shaft, flexible bellow seal, and mounting flange, forming a compact and reliable sealing system. The bellow element acts as a dynamic barrier, ensuring vapour-tight and liquid-tight containment while allowing smooth shaft movement during continuous stirring operations.

Key Features

• Flexible bellow seal construction
• Absorbs axial movement and vibration
• Prevents stress transfer to glass components
• Suitable for low to moderate pressure duties
• Compatible with glass, PTFE, and stainless steel assemblies
• Low maintenance and easy installation

Technical Specifications

• Seal Type: Bellow seal
• Operating Pressure: Low to moderate
• Operating Temperature: Process-dependent
• Shaft Alignment Tolerance: High
• Material Compatibility: Borosilicate Glass 3.3, PTFE, SS 304 / SS 316
• Mounting: Standard glass reactor flange

Applications

• Glass reactors
• Laboratory and pilot plants
• Batch chemical processing systems
• Low-viscosity liquid agitation
• Corrosive and solvent-based processes

Advantages

• Minimizes mechanical stress on glass equipment
• Ensures leak-tight and safe operation
• Simple design with high operational reliability
• Economical solution for standard stirring applications

Selection Guidelines

Choose the Drive Unit with Bellow Seal when:

• Process pressure is low to moderate
• Media is chemically aggressive but non-abrasive
• Thermal expansion or shaft movement is expected
• Glass equipment protection is a priority