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Mechanical seals according to applications
(mixers, agitators etc.) incl. special mechanical seals
     
     
  The main emphasis of our program is on mechanical seals in special design for applications with
   
  • mixers
  • agitators
  • autoclaves
  • kneaders
  • filters
  • homogenizers
  • driers
  • ball mills
  • and others
 
   to be applied in different branches of industry, such as pharmaceutics, chemical industry, food processing industry, pulp and paper industry etc.

The following applications are examples, representing a large number of further applications of CHETRA mechanical seals in process technology.
     
   
  Aniline (rotating filters)  
  This application requires a mechanical seal specifically adapted to and integrated into the aggregate (rotating filter) with special consideration given to the toxic medium aniline. For this application, CHETRA developed the "integral solution" as follows.
     
577
  • multiple-acting / 2 x double-acting
  • preassembled cartridge mechanical seal ready for installation
  • balanced
  • independent of direction of rotation
  • multiple springs (protected)
  • stationary design
Dimensions: 40-200 mm
pmax: 25 bar
tmax: 220C
vmax: 15 m/s
 
  Operation: with higher barrier pressure and auxiliary cooling

The tested, "integral" ready-for-installation unit contains two double-acting, stationary mechanical seals, shutdown- and intermediate seals as well as the integrated bearing.

- special high-tech design features like "self-aligning" hard alloy seal faces
- guided circulation flow, protection of the sealing elements most essential for function, esp. seal face finish and seal face geometry are applied

Result: long-term mechanical seal for difficult operating conditions
     

   
  Butadiene/ bottom agitator
  The medium butadiene cures permanently elasticly. This means high expenditure for cleaning in case of sealing problems.
For example, cleaning has to occur with water under 400 bar pressure. Typical agitator diameters of the applications described are 120 mm (resp. 4 ") and 150 mm (resp. 6").
Besides the usual criteria which make very high service life desirable, a service life of more than 3 years is required because of the size of the plants and the resulting cost-intensive handling.
     
541
  • double-acting
  • preassembled cartridge mechanical seal ready for installation
  • double balanced
  • independent of direction of rotation
  • with integrated bearing
Dimension: 40-200 mm
(also in inches)
pmax: 20 bar
tmax: 220C
vmax: 10 m/s
 
  Operation: with higher barrier pressure / auxiliary flushing

Mechanical seal style 541 is designed in structure and material to resist high load and to ensure long service life:
- double balance for increase safety
- optimized, guided barrier fluid flow for improved dissipation of heat
- "self-aligning" solid hard alloy seal faces - stationary design
- customized mechanical seal, which adapts itself to the existing aggregate
- simple installation / dismantling
     

   
  Filter drier mechanical seal - conversion from packing
  New filter driers are almost exclusively equipped with mechanical seals. Even so, many existing aggregates still run with (PTFE) stuffing box packings. That means high maintenance and often the vacuum required is difficult to obtain.

Therefore conversion from packing to mechanical seal is recommended, if the plant meets the required standards otherwise.

Mechanical seal style 577 (sterile) meets the requirements of such a conversion from packings and the corresponding demands of the mechanical seal.
   
     
577
in sterile design
  • preassembled cartridge mechanical seal ready for installation, with stroke bellows
  • balanced
  • independent of direction of rotation
  • with integrated bearing
  • multiple springs
Dimensions: 65-200 mm
pmax: 20 bar
tmax: 220C
vmax: 15 m/s
 
  Operation: with higher barrier pressure / neutral barrier medium, capable for CIP
  Data for this application:
p: vacuum - 3 bar
v: 0.1 m/s
axial elevation: 700 (neutral) +/-200 mm
vacuum capability
dead-spot free design/ CIP capability
Materials approved by FDA
Elevating bellows to take up axial movement
Adaption of mechanical seal to existing aggregate
simple conversion

Style 577G available as gas-lubricated design
 

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