Elastomer Bellow - NES type 25-1, 25-2, 25-3

NES type 25-1

NES 25-1, 25-2, 25-3 Mechanical Elastomer Bellow Seal - equivalent to John Crane 2100
= John Crane 2100

Operating Conditions:

Pressure: Up to 12 kg/cm2
Temperature: -20 C ~ 180 C
Speed: Up to 10 m/s

Materials:

Face: Carbon, SiC
Seat: Ceramic, SiC, TC
Elastomer: NBR, EPDM, Viton
Metal: 304SS, 316SS

Cross Specification Chart

Cross Specification Chart for NES 25-1, 25-2, 25-3 mechanical seal equivalent to John Crane 2100Cross Specification Chart for NES 25-1, 25-2, 25-3 mechanical seal equivalent to John Crane 2100
 

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Additional Notes:

Impact Elastomer bellows seal.

Standard Seat Compatibility:

NES R mechanical seal seat is equivalent to John Crane M

NES R is John Crane M

specification chart in Metric

Alternative Seat Compatibility:

NES Q mechanical seal seat is equivalent to John Crane BS

NES Q is equivalent to John Crane BS

specification chart in Metric

NES S mechanical seal seat is equivalent to John Crane NG

NES S is equivalent to John Crane NG

specification chart in Inches

  
 
"Non-Pusher" Elastomer Bellows Seal

An elastomer bellows seals is a non-pusher seal design in which a single spring coil fits over the shaft and bellows. The elastomer bellows requires a concentric spring; the metal bellows does not because the bellows itself provides the pressure necessary to hold the seal faces in contact.

Fits equipment with confined space requirements and limited seal chamber depths.

An elastomer bellows seal combines the best features of a bellows seal and a pusher seal, such as the absence of a dynamic gasket which eliminates the possibility of 'hang-up.'

The elastomer bellows is tolerant to abrasive particals or contamination. This is due to the features of the open shape and the 'self-cleaning action,' disposing of particles through centrifugal force.

One major benefit is the simplicity of the design and subseqent lower cost.

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