Chesterton’s 255 Dual Cartridge Seal is the best value in dual sealing today for plant wide applications. The advanced face technology offers a cool running, double balanced seal capable of running in double or tandem modes.

• Exclusive face design for superior emissions control capability.
• Stable, secure sealing under fluctuating conditions. 
• Universal gland fits most pumps.
• Patented Self-Centering Lock Ring ™ mechanism locks the 255 seal to the shaft and automatically aligns the seal faces. 
• Features an internal positive barrier fluid pumping system with wide flow channels for efficient removal of heat.
• Outboard and inboard face sets are identical for simple assembly and low replacement parts inventory.
• Complete barrier fluid systems are available.

Chesterton’s 255 Dual Cartridge Seal

• Every O-ring is either static or moves on a non-fretting, non-metallic surface.
• Precision seal ring shoulder maintains rotary alignment.
• Inboard rotary and stationary faces
• Dynamic stress-relieving seal rings, mated over a narrow cross-section for low heat generation.
• Profiled sleeve provides positive pumping of barrier fluid.
• Patented shuttle slides within gland to decouple faces from gland misalignment, channel barrier fluid, and provide anti-rotation for stationary seal rings.
• Large barrier fluid ports provide high capacity cooling.
• Universal gland fits majority of pumps. ANSI oversize and API glands available.
• Outboard stationary and rotary faces, identical to inboard set for simple assembly, lower replacement inventory.
• Inboard and outboard integral drive pads cannot loosen or fall out.
• Patented Self-Centering Lock Ring™ mechanism locks the 255 to the shaft, automatically aligning the faces with the shaft.
• 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.
• Built for the future of emissions control.
• Advanced technology for applications flexibility.
• Exclusive design enables the 255 to operate in double-mode (barrier fluid pressure higher than stuffing box pressure)or tandem-mode (barrier fluid pressure lower than stuffing box pressure). 
• Stays cool in operation and under pressure.
• Handles more pressure than typical seals, providing users with a margin of safety at start-up and shut-down when transient surges often occur.
• Features an internal positive barrier fluid pumping system with wide flow channels for efficient removal of heat.