Chesterton’s 222 Motion Seal is a dual cartridge mixer seal for mixers, double-ended pumps, vertical pumps, reactors, clarifiers, agitators and other rotating equipment subject to moderate shaft runout and end play.

Cartridge Mounting Makes Installation Fast and Easy

• No engineering, measurements or adjustments.
• No loose parts to damage or misplace.
• Mounting set screws are located outside the seal chamber for simple installation and inspection.

Long-Lasting Dual Sealing Protection

• Two seals in one control leaks, hold vacuum.
• Hydraulically Balanced Seal Faces safely accommodates higher fluid pressure on either the barrier fluid or process fluid side of the faces - low friction for less heat buildup, less power consumption and longer seal life.
• No Frets,No Grooves, No Scores
  • Unlike other seal designs that use a potentially damaging moving elastomer as a seal on the shaft, Chesterton seals use a static O-ring that won’t fret, groove or score the shaft or sleeve.
• Floating stationary and other design features provide multi-directional mobility, allowing the 222 Motion Seal to absorb two-way shaft motion that would make other seals fail.
• Universal Slotted Gland Comes In 4-Bolt Pattern
  • It contains two easily accessible barrier fluid ports for the introduction and return of fluid to and from a Chesterton convection tank or other pressurized system.

Chesterton’s 222 Motion Seal

• Floating Stationary Absorbs Two-Way Shaft Motion
  • Exclusive Floating Stationary and other design features provide multi-directional mobility, allowing 222 Motion Seal to absorb two-way shaft motion that would make other seals fail.
  • As a stationary seal, 222 can compensate for seal chamber misalignment that could readily cause rotary seals to fail.
• Hydraulically Balanced Seal Faces
  • A balanced seal utilizes only a calculated portion of fluid pressure to help the springs keep the faces closed. 222’s inboard face are double balanced to safely accommodate higher fluid pressure on either the barrier fluid or process fluid side of the faces. Result is low friction for less heat buildup, less power consumption and longer seal life. Confident sealing is maintained even if the barrier fluid pressure is lost completely. Conventional mixer seals will often fail under these conditions.
• Unlike other seal designs that use a potentially damaging moving elastomer as a seal on the shaft, Chesterton seals use a static O-ring that won’t fret, groove or score the shaft or sleeve.
• All springs are isolated from the process fluid to prevent corrosion or clogging.
  • Multiple-coil springs are contained in both of the dual seal’s stationaries so that axial movement doesn’t affect face loading
• Cartridge Mounting Makes Installation Fast and Easy
  • No engineering, measurements or adjustments. No loose parts to damage or misplace. Mounting set screws are located outside the seal chamber for simple installation and inspection.
• Universal Slotted Gland Comes In 4-Bolt Pattern
  • Slotted gland fits a wide range of seal chambers. It contains two easily accessible barrier fluid ports for the introduction and return of fluid to and from a Chesterton convection tank or other pressurized system.

Double seal arrangement
Barrier fluid pressure is higher than product pressure. Normally prevents leakage of hazardous, toxic or costly products into the atmosphere and provides lubrication to both sets of seal faces when the product doesn’t stay in contact with the seal.

Tandem seal arrangement
Barrier fluid pressure is lower than product pressure. Effective method of equalizing the pressure differential across seal faces to reduce frictional wear and extend seal life.

Spare seal arrangement
Barrier fluid pressure is just above atmospheric pressure. Provides lubrication to the outboard seal faces. The outboard seal is the installed spare, ready to be operational after the inboard faces wear out in normal use, thus avoiding an unscheduled shutdown during critical processes. Also reduces downtime on equipment that is hard to tear down or in an awkward position.