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.


This system 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

Evolution Defibrator series

EVO models with segments ranging in diameter from 46 to 74”.

Defibrator systems - extended performance

Products and services that are currently available for Defibrator systems.

Defibrator system - Process and automation upgrades

High capacity water booster pump

A new pump with the same motor and connections in order to increase the flow from 91 l/h to 164 l/h.

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.

Preheater Upgrade

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

Retention-time control in preheater

The position of the carriage in combination with the feed-through rate in the preheater automatically controls the retention time of the raw material.

High Performance Gear Box

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

Feeding Technology

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

Feed Screw LL

The geometry in combination with low friction in the long lasting material contributes to a lower energy consumption.

Tandem blow-back damper

Creates increased load on the blow-back damper for increased dewatering.

Dewatering Plug Pipe

A plug pipe that dewaters the raw material even more before it enters the preheater.

Mechanical Seals for Defibrator system

Highly specialized seals, custom made for optimum sealing performance.

Mechanical Seal for L42 - L46 Defibrators

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

Bearing Unit Upgrade

Introducing a 4th bearing in the bearing unit reduces the load on all bearings significantly

Steam Cone

Even steam distribution and reduced bridging.

Refiner Hydraulic Unit

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

Water Purifier

Less costs for maintenance and repair of the seal

Automation products for Defibrator system

Take control of your Defibrator

Refiner Control System Upgrade

Process Automation – Improvement products

Refiner Adjustment Device

This is an upgrade device that is more reliable and demands less maintenance.

Disc Gap Control

Safely control the refiner/ Defibrator from a remote control room.

TVD - Touch point vibration detector

Replaces the old SPM/TPM system.

CMS – Upgrade kit to electric stepping motor

Optimize your energy consumption and fiber quality.

Refiner Position Monitoring

Gives information about the axial position of the rotor or a stator on a refiner/Defibrator.


Defibrator system - Spare parts and components

Refiner Exchange Service

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

Exchange Agreement

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

Valmet Refiner Upgrade

For longer service lifetime for the M/P-series Defibrator

Spare part service kits for Fiberboard

Further value to the Shutdown planning


Defibrator system - Maintenance and shutdown services

Valmet Refiner Reconditioning

Modular maintenance solutions for flexible service offering.

Recond. of drop-in units – RG(P), L

A profitable investment for maximum service life, availability and performance.

Plug Screw Reconditioning

Reconditioning packages ensures uniform chip feeding.

Segment holders

Maintenance program for refiner segment holders improves refiner operation.

Bearing Unit Upgrade

Introducing a 4th bearing in the bearing unit reduces the load on all bearings significantly


Defibrator system - Process support and optimization

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.





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