Standard Johncrane Type 21 Mechanical Seal

Elastomer bellow mechanical seal SRS-E21, can be replaced of Johncrane 21. Suggested operating limits Temperature: -20 - 120℃ Speed: ≤15m/s Pressure≤1.0Mpa Combined material Rotary face: Carbon/Sic/TC Stat Ring: Ceramic/Sic/TC Seat Type: Standard SRS-S11, Alternative SRS-S20/S21. Features The...

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Elastomer bellow mechanical seal SRS-E21, can be replaced of Johncrane 21.


Suggested operating limits

Temperature: -20 - 120℃

Speed: ≤15m/s

Pressure≤1.0Mpa


Combined material 

Rotary face: Carbon/Sic/TC

Stat Ring: Ceramic/Sic/TC

Seat Type: Standard SRS-S11, Alternative SRS-S20/S21.


Features

The drive band's "dent and groove" design eliminates overstressing of the elastomer bellows to prevent bellows slip and protect the shaft and sleeve from wear.

Non-clogging, single-coil spring provides greater dependability than multiple spring designs and will not foul due to fluid contact.

Flexible elastomer bellows automatically compensates for abnormal shaft-end play, run-out, primary ring wear and equipment tolerances.

The Type 21 is ideal for use in centrifugal, rotary and turbine pumps, compressors, chillers and other rotary shaft equipment. It is also commonly used by the waste water and water systems industries for applications such as waste treatment, potable water and HVAC.


Also we could manufacture seals according to your drawing, and design as your request.

SIZE/INCHdD3D31D6D7L3L4
0.500 12.7 24.0 22.8 19.05 25.40 20.62 7.95 
0.625 15.8 26.7 26.7 23.80 31.75 22.23 10.31 
0.750 19.0 31.2 30.4 26.97 34.93 22.23 10.31 
0.875 22.2 33.6 33.4 30.15 38.10 23.80 10.31 
1.000 25.4 43.2 39.3 33.32 41.28 25.40 11.10 
1.125 28.5 46.5 42.0 36.50 44.45 26.97 11.10 
1.250 31.7 49.5 45.8 39.70 47.63 26.97 11.10 
1.375 34.9 52.7 49.3 42.85 50.80 28.58 11.10 
1.500 38.1 56.0 52.8 46.05 53.98 28.58 11.10 
1.625 41.2 62.2 55.5 50.80 60.33 34.93 12.70 
1.750 44.4 66.0 61.0 53.97 63.50 34.93 12.70 
1.875 47.6 66.0 64.0 57.15 66.68 38.10 12.70 
2.000 50.8 73.0 66.0 60.33 69.85 38.10 12.70 
2.125 53.9 73.5 71.5 60.33 76.20 42.85 14.27 
2.250 57.1 79.6 79.6 61.90 79.38 42.85 14.27 
2.375 60.3 82.0 79.6 65.10 82.55 46.05 14.27 
2.500 63.5 85.0 81.5 68.25 85.73 46.05 14.27 
2.625 66.6 88.5 84.6 71.42 85.73 49.20 15.88 
2.750 69.8 92.7 90.0 74.60 88.90 49.20 15.88 
3.000 76.2 102.0 96.8 80.95 98.43 52.37 15.88 

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