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Seals

T21

MOSTLY USE:  WATER, OIL AND OTHER LOW CORROSION LIQUIDS


The T21 seals are part if the diaphragm rubber bellow seals and are interchangeable with various other makes including John Crane Type 1, 2 and 21.  The Bellow rotates with the shaft and can accommodate some end float, eccentricity and misalignment.  These seals come in Metric and Imperial sizes.


Benefits

Positive Drive:              Reduces Bellow Stress

Self Adjusting:             Bellow takes care of wear & shaft float

Long Life:                    Due to minimum face loading

Non clogging:              Open Spring Design

Non Fretting:               No moving O-rings

Bi-directional:              Due to positive drive


Service Capability

 

Max. Speed: 15 m/sec

 

Max. Pressure: 14 bar

 

Temp.:  -40⁰C to 200⁰C

 

Media: Dependant on Materials

 

  

* See P.V. Curves for max.

  Speed/pressure

  combination

 

Note

P.V. Curves for water @ 20⁰C


Materials

Rotary Face:         Car, Sil, TC

Stat Face:             Cer, Sil, TC

Spring:                  304 Stainless Steel

Elastomer:             Nitrile / Viton / EPDM

Metal Parts:           316 Stainless Steel


BELLOWS SEAL TYPE 21

SHAFT DIAMETER (mm)

Car/Sil  


Car/Tc  


Tc/Sil  


Car/Cer & Sil/Sil


Tc/Tc  


Car/S-steel  


T21 Metric

L2 = T21 MET  

L1 = T21 MET LONG  


T21 Imperial

L2 = T21 IMP

L1 = T21 IMP LONG