Hastelloy Opt SS304 Coated Multi Spring Mechanical Seal

A multi-spring CTFE (chlorotrifluoroethylene) bellows mechanical seal combines the robustness of multiple coil springs with a CTFE bellows that ensures reliable sealing under corrosive and variable-pressure conditions. The multi-spring arrangement distributes axial load evenly across the seal faces, while the CTFE bellows functions both as a secondary seal and a dynamic spring, eliminating O-ring friction and improving responsiveness

Operating Principle

Springs exert uniform axial pressure to bring the rotating and stationary faces together, while the CTFE bellows compensate for wear and misalignment. As the shaft turns, a thin fluid film (<10 µm) forms between faces, minimizing friction and wear. Balanced design allows use in moderate pressures; the metal-supported bellows further assist with pressure balancing .

Advantages

• Chemical Resistance: CTFE bellows excel in corrosive fluids—strong acids, alkalis, solvents—making these seals ideal for chemical, petrochemical, and wastewater applications .
• Axial Compensation & Self-Alignment: The bellows’ flexibility accommodates misalignment, shaft movement, and wear without O-ring drag.
• Redundancy & Reliability: Multi-spring setup ensures sealing even if one spring fails, offering robustness in dynamic or vibration-prone environments .
• Low Friction & Long Life: Combination of CTFE dynamic sealing and balanced face load results in lower heat and wear.