Material Combinations (Optional)
Seal Faces:
Carbon Graphite / Silicon Carbide (SiC)
Silicon Carbide (SiC) / Silicon Carbide (SiC)
Tungsten Carbide (TC) / Tungsten Carbide (TC)
Secondary Seals (Bellows):
NBR (general purpose)
EPDM (high temperature & chemical resistance)
FKM (Viton, excellent chemical & heat resistance)
PTFE (for highly corrosive fluids)
Metal Components: 304 / 316L Stainless Steel
The 204B is a single‑end, balanced, rubber bellow mechanical seal specifically designed for vertical reactors, agitators, mixers, and fermentation tanks. It features a compact multi‑spring structure and a robust flange mounting system, making it ideal for medium‑pressure, medium‑temperature applications in chemical, pharmaceutical, food, and wastewater industries. This seal is widely recognized as a standard solution for sealing process fluids in top‑mounted mixing equipment.
Features
Balanced Single‑End Structure
Optimized face load design reduces friction and heat generation, enabling stable operation under medium pressure conditions and extending seal life.
Rubber Bellow & Multi‑Spring Compensation
The rotating unit uses a rubber bellow as the secondary seal, paired with small multi‑springs to provide uniform axial compensation. This design accommodates shaft runout, misalignment, and thermal expansion effectively.
Flange Mounting System
Comes with a pre‑machined stainless steel flange for direct installation to the reactor vessel, ensuring precise alignment and easy maintenance.
Positive Drive Mechanism
A claw‑type or keyed drive system ensures reliable torque transmission between the shaft and seal, with no risk of slippage during operation.
Bidirectional Rotation
Compatible with both clockwise and counterclockwise shaft rotation, making it suitable for a wide range of mixing equipment.
Advantages
Versatile Performance: Balanced design for medium‑pressure, wide‑temperature services
Reliable Sealing: Multi‑spring system ensures consistent face loading and minimal leakage
Easy Installation: Flange‑mounted design simplifies alignment and reduces downtime
Corrosion Resistance: Wide material selection adapts to aggressive chemical environments
Cost‑Effective: Simple structure, low maintenance, and long service life
Applications
Vertical Reactors & Agitators: Chemical synthesis, polymerization, and neutralization processes
Fermentation Tanks: Pharmaceutical and food & beverage production
Mixing Vessels: Wastewater treatment, pulp & paper, and mineral processing
General Industrial Equipment: Top‑mounted pumps and mixers handling clean or mildly abrasive fluids
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