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Double-Acting Mechanical Seals

Mechanical Seals for Zero-Leakage and Challenging Requirements

Double-acting liquid-lubricated mechanical seals are the most common type for mixing applications. These seals can be used under nearly all operating conditions in a mixing vessel. They can also be designed as a gas-lubricated version in which a continuous supply of gas into the seal chamber maintains a marginal gap, thus preventing wear of the seal rings.

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Product Details

Function and application:

  • Double-acting liquid lubricated mechanical seal for low pressure applications up to 7 bar (abs.)
  • Two identical pairs of seal rings in a back-to-back arrangement
  • Deliverable with short heat trap for cooling
  • Deliverable with water jacket on storage vessel for cooling

 

Advantages:

  • Wear parts standardized by modular design
  • Double acting, even in low pressure range
  • Compact dimensions, suitable for small installation spaces
  • Ideal replacement for stuffing boxes
  • Design for cost saving

 

Working limits:

  • Operating pressure: vacuum ... 7 bar (abs.)
  • Vessel temperature: -50...+400°C
  • Shaft size: 40...220 mm
  • Sliding speed: 0...5 m/s

The EKATO ESD34N is most suitable for:

  • Bulk chemicals
  • Polymers
  • Pharmaceutical products and cosmetics
  • Specialty chemicals
  • Formulated consumer products
  • Biofuels and bio refineries
  • Storage tanks

 

 

 

 

Function and application:

  • Double-acting mechanical seal liquid lubricated
  • Two identical pairs of seal rings in a back-to-back arrangement
  • Ideal mechanical seal for applications in the medium pressure range up to 40 bar (abs.)
  • Use of the modular design opens up many different extension options
  • Mechanical seal most commonly used in agitators worldwide
  • Deliverable with short heat trap for cooling
  • Deliverable with water jacket for cooling

 

Advantages:

  • Life cycle cost savings due to extremely solid construction
  • Use of FEA ensures optimized stress distribution in every seal ring
  • Special spring designs ensure uniform pre-tensioned conditions even in cases of significant agitator shaft displacements
  • Almost zero-leakage under the roughest conditions

 

Working limits:

  • Operating pressure: vacuum ... 40 bar (abs.)
  • Vessel temperature: -50...+400°C
  • Shaft size: 40...220 mm
  • Sliding speed: 0...5 m/s 

The EKATO ESD34G is most suitable for:

  • Bulk chemicals
  • Polymers
  • Specialty chemicals
  • Formulated consumer products
  • Pharmaceutical products and cosmetics
  • Biofuels and bio refineries
  • Hydrometallurgy

Function and application:

  • Double-acting mechanical seal liquid lubricated for high pressure applications
  • Robust high pressure seal with four geometrically identical seal rings arranged back-to-back
  • Position of the seal rings remains unchanged, even when the pressure is reversed
  • Application in high pressure processes including supply systems - Maximum requirements for reliability
  • Suitable for frequent changes in pressure, extremely high temperatures and significant agitator shaft displacements

 

Advantages:

  • Resistant to pressure changes 
  • Resistant to agitator shaft displacements
  • No deformation of the mechanical seal under pressure
  • High temperatures possible / better heat dissipation
  • Minimal leakage
  • Extended life time

 

Working limits:

  • Operating pressure: vacuum ... 100 bar (abs.)
  • Vessel temperature: -50...+400°C
  • Shaft size: 40...220 mm
  • Sliding speed: 0...3 m/s

The EKATO ESD64H is most suitable for:

  • Bulk chemicals
  • Specialty chemicals
  • Hydrometallurgy

Function and application:

  • Double-acting mechanical seal liquid lubricated for slurry applications
  • Pair of product side seal rings extends into the vessel space
  • Surfaces are smooth and the design minimizes gaps to prevent dirty corners - thorough cleaning is possible
  • Sealing abrasive suspensions and sticky or crusty media (below liquid level, side entry installation)
  • Sterile seal construction (ESD44S) also available - any orientation possible

Advantages:

  • No dirty corners, thorough cleaning possible
  • Can be sterilized
  • Solid design

Working limits:

  • Operating pressure: vacuum ... 16 bar (abs.)
  • Vessel temperature: -50...+230°C
  • Shaft size: 40...300 mm
  • Sliding speed: 0...5 m/s

The EKATO ESD 44 is most suitable for:

 

 

 

Function and Application:

  • Ideal for sterile processes
  • Delivered in a complete sterile system including sterile installation
  • Seal liquid condensate cooled by a plate heat exchanger
  • Continous sterilisation of the condensate by fresh steam

Advantages:

  • Complete sterile system, mechanical seals and sterile installation from a single source
  • Ready-to-install cartridge unit
  • No gaps: ideal for sterile processes
  • ESD sterile installation operates virtually maintenance-free and consumes very little energy 

Working limits:

  • Operating pressure: vacuum ... 4.5 bar (abs.)
  • Steam temperature: 130°...150°C
  • Shaft size: 40...300 mm
  • Sliding speed: 0... 5 m/s

The EKATO ESD ESD34/44S is most suitable for:

  • Specialty chemicals
  • Pharmaceutical products and cosmetics
  • Biofuels and bio refineries

Function and application:

  • Double acting mechanical seal liquid lubricated
  • Used for products with a high solids content and sterile processes
  • Perfect for high-speed shafts

Advantages:

  • Easy to clean and sterilize
  • Extended life time, even on high-speed machines

Working limits:

  • Operating pressure:vacuum ... 6 bar (abs.)
  • Vessel temperature: -20...+200°C
  • Shaft size: 40...220 mm
  • Sliding speed: 0...20 m/s

The EKATO ESD ESD114  is most suitable for:

  • Formulated consumer products
  • Pharmaceutical products and cosmetics

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