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Defibrator system

The key features of the Evolution Defibrator system include a high-capacity screw-feeder system with a dewatering plug pipe and advanced helical discharge from the refiner housing.

Defibrator system

This refiner segment technology includes a bearing system with no axial play, an exterior design that contributes to operating stability and facilitates access for easier maintenance.

Since launch, the EVO series has been expanded to include an EVO 46, EVO 50, EVO 56, EVO 64, EVO 70, EVO 74. Since its launch on Ligna 2005, the EVO series has been a great sales success and is operational on all of the world’s continents.

  • Low operating cost
  • Low electric energy consumption
  • Excellent dewatering capacity
  • Saves energy in the dryer
  • Low steam consumption
  • Minimal water consumption
  • Uniform fiber flow
  • Saves resin
  • Easy to operate and maintain
  • Short time to production
  • Global service network
  • Continuous development


Process and automation upgrades for defibrator systems

Diverter Valve

The most price competitive diverter valve in the market

Blow Valve ET

Wear resistant blow valve, increases service life and provides stable operation.

Feeding Technology

Screw feeder technology that provides uniform feeding, optimized dewatering and reduced energy consumption.

Disc Gap Control

Safely control the refiner/ Defibrator from a remote control room as well as protecting the segments from clashes.

Preheater Upgrade

Upgrade kit that raises the preheater’s capacity by up to 30%.

Refiner Hydraulic Unit

A complete unit that fits on existing refiners without any modifications.

Feed Screw LL

The geometry in combination with low friction in the long lasting material contributes to a lower energy consumption. In some cases the needed power for the plug screw feeder drive has been reduced with as much as 40%.

Dewatering Plug Pipe

A plug pipe that dewaters the raw material even more before it enters the preheater. This saves energy in the drying process.

Mechanical Seal for Defibrator system

Highly specialized seals, custom made for optimum sealing performance.

Steam Cone

Even steam distribution and reduced bridging.

Mechanical Seal for L42 - L46 Defibrators

Kit for conversion to a mechanical seal and an accessory sealing water system.

High Performance Gear Box

Valmet offers an upgrade kit to replace existing agitator drives for preheaters.


Spare parts and components for Fiberboard

Refiner Exchange Service

A completely reconditioned drop-in unit, upgraded to the latest design.

Mechanical Seal for Defibrator system

Highly specialized seals, custom made for optimum sealing performance.

Exchange Agreement

Alternative to purchasing spare parts in connection with a new investment.


Maintenance and shutdown services for fiberboard

Drop-in units

Reconditioning of drop-in units is a profitable investment.

Plugscrew Reconditioning

Reconditioning packages ensures uniform chip feeding.

Segment holders

Maintenance program for refiner segment holders improves refiner operation.

Water Purifier

Less costs for maintenance and repair of the seal


Process support and optimization for Fiberboard

Process optimizer for fiberboard

Your process can do even better!

Process Optimizer Agreement

To helps customers to reduce mat density deviation and specific energy costs.