Chesterton’s 280 Mixer Seal puts high reliability in motion.  All of the high reliability features that make the standard 280 Seal such a strong performer under adverse conditions are augmented by extended motion handling capability.

• The 280M Cartridge Dual Seal is designed for total containment of product and emissions.
• Uses a compatible liquid barrier fluid that can be at higher or lower pressure than process.
• Provides zero emission capability.
• Multiple patented features ensure reliability.
• Available with force circulated barrier fluid system for the most demanding applications.

• Every O-ring is located on the OD of the seal rings to prevent compression hang-up under elevated temperatures.
• All O-rings move on a clean micro-polished surface to reduce hysteresis.
• Inboard shroud provides physical protection to the seal ring and a smooth surface for O-ring travel.
• Dynamic stress-relieving inboard seal rings with rotating narrow face designed to prevent contaminant intrusion.
• Barrier fluid channel with built-in cutwaters for enhanced pumping action and fluid exchange.
• Large bore barrier fluid ports provide high capacity cooling.
• Increased radial clearances provide efficient barrier fluid flow and heat removal.
• Outboard stationary and rotary faces, identical to inboard set for simple assembly, low replacement inventory.
• Corrugated graphite cushioned drive prevents face damage from high torque start-ups and viscous shearing forces.
• Revolutionary Unified Seal Alignment™ requires only one set of springs to provide constant loading of all four faces. Springs are isolated from process and barrier fluids.
• Centering clips locate the stationary seal rings directly to the shaft for a truly centered seal.
  • No risk of sleeve contact with stationary seal parts.
• Patented Self-Centering Lock Ring™ mechanism locks the 280 to the shaft, automatically alligning the faces with the shaft.
• The revolutionary Unified Seal Face Alignment then allows all 4 faces to maintain perpendicularity to the shaft centerline and minimize the effects of stuffing box face misalignment.
• Instantaneous pressure shift capability of the double balanced 280 eliminates mixer and pressure vessel sealing worries even under jarring purge and pressure cycles.