Mechanical Seals

Our aim is Customer Satisfaction, Through Quality Products & Prompt Services
Fluid Sealing Products
The difference is obvious

Chesterton, the world leader in split seal technology, has the largest installed base globally. Our broad experience in split sealing enables a wide array of users to improve plant efficiencies. Today, with years of proven performance, Chesterton split seals are used in more types of equipment, sealing more types of process materials.



  • Broad range of sizes — to diameters of 24 inches (610 mm) and beyond
  • Easy to install / simple field repair—no glued or bonded components
  • Superior performance, high pressure, and vacuum sealing
  • Compact design fits most rotating equipment
Chesterton patented innovation drives performance

The 442’s unique, patented adjustable gland, with captured fasteners, and automatic centering deliver unsurpassed ease of use.

Proven Design, Superior Performance

Chesterton split seals are installed in all types of equipment and deliver years of reliable service.

Applications include:

  • Cooling tower pumps
  • Raw water pumps
  • Side entry mixers
  • Blenders
  • Processing tanks
  • Fermentors
  • Condensate pumps
  • Process pumps
  • Top entry mixers
  • Bottom entry mixers
  • Vacuum pumps
  • Boiler feed pumps
  • Stern tubes
  • Conveyors
  • Fans
  • Dryers
  • Cookers
  • Water turbines
Easy to install

"P" shaped spacer positions the 442 seal for easy installation.

Ball-and-socket o-rings are leak-free, without the use of adhesives. Installation video is available to demonstrate easy installation.

280 Mixer Seals
The Challenge :

Chesterton was challenged by one of the world's largest refineries to improve the MTBR for mixer seals used in their Alkylation Reactor Units. Ideally, the service life of the seal would run in parallel with their 5-year turnaround cycle. Secondary issues included reducing repair costs, lowering acquisition costs and offering local seal repair. Previously a combination of Durametallic and older Chesterton seal designs were used. The Dura MX-201 cartridge seals lasted from 2-3 years causing unscheduled interruptions and impacting overall production.

Mixer Challenges:
  • Excessive vibration
  • Unscheduled interruptions
  • Excessive axial motion & runout
  • Vessel contamination
  • Controlling emissions
280M Heavy Duty Mixer Seal
  • Extended radial motion capabilities
  • Self-centering, self-aligning dual seal
  • Vibration isolated faces
  • Zero emissions capability
  • High torque capability
  • Field repairable
  • Pre-planned configuration
  • Economical, high performance sealing
170 Slurry Cartridge Seals
Simple with Low Operating Cost

The 170 Slurry Seal is engineered to Operrate in severe slurry environments, eliminating costly external seal flushes. Plant efficiency improvements are achieved with the 170 seal by reducing product dilution and increasing production rates while meeting environmental concerns. The abrasive slurry operating environment along with low water dilution requirements creates an aggressive sealing challenge. The 170 meets this challenge by integrating multiple high performance slurry design features. These features combined with Chesterton’s local service will deliver unparalleled slurry handling performance levels.

Slurry seal performance features:
  • Non-clog pressure plate design
  • Micro-polished O-ring surfaces
  • Line-to-line hydraulically balanced seal faces
  • Optimal spring rate
  • Simple durable design
Features and Benefits
  • Simplified, robust design
  • External pressure plate design
  • Micro-polished surfaces
  • Optimized spring rate
  • Slurry handling faces
  • Enhanced drive mechanisms
155 Cartridge Single Seal
Engineered to prevent common Failure modes

Self Centering Lock Ring Ensures Reliability

The Patented Prcise for correct face mating and sustainable sealing. Cloverleaf 3 point Contact ensures concentricity to the shft. Faces start out square and stay square to prevent the instrusion of contaminats of abrasives. also, consistant face squareness reduces opportunities for fluid leakage and uneven wear

Dynamic Stress relief keeps faces Closed

Many Common conditions create dynamically chnaging stresses on the seal faces. Consider changes in tempratures of pressure, Fluid phase changes, or water hammer. commnface geometries distortat the mating surface stresses in the body of the seal ring, away from the critical face mating surfaces. faces stay flat, preventing intrusion of contaiminants or fluid leakage for long term reliability

The Most Flexible, reliable, general service seal

Highly Effective emissions control

The advanced design of the 155 and ability to keep faces square and flat ensures superior emissions control capability. the 155 has proven in independent tests to be able to meet or exceed the most stringent USA emissions standarts. of course for total emissions control or hazardous fluids, use Chesterton ne generation dual seals

891 Rotary Seals
Extends capabilities and reliability of general service sealing for plant - wide usage.

  • Metal holder is support bushing in the event of shaft bending at start-up. The face is not disturbed if there is contact.
  • Non-fretting design will not destroy shaft, sleeve or any metal part.
  • Balanced O-ring design with anti-clog features.
    • Springs out of fluid.
    • Dynamic O-ring moves to a clean surface.
    • Centrifugal force works to clean the seal faces and rotary element.
  • Computer profiled face design
  • Ability to withstand large changes in operating temperature while keeping face flat.
  • Ability to operate at pressures up to 42 BAR (600 psi) because heat generation does not greatly affect seal face flatness.
  • Dynamic O-ring slides on smooth, non-metallic surface to prevent fretting and hang-up.
  • Metal holder is never subjected to fretting or wear.
  • CHESTERTON Patented Self-Aligning : CHESTERTON 891 Rotary Seal may be run against conventional stationaries, however, as shown with CHESTERTON Self-Aligning Stationary (SAS) , stuffing box face alignment is automatic. Start -up leakage is controlled.

All wearing parts, seal faces, O-rings, screws and springs are replaceable at low cost, making in-plant rebuilding simple and economical. Parts being replaced can be crushed and bagged for environmentally safe disposals