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Single-Spring Elastomer Bellow Seals R18 John Crane Type 21

Elastomer Bellow Seals R18
Replacement for:
  • John crane type 21

Features:
  • Single-Spring
  • SS316 metal available
  • Oversize available

Operating Limits of Elastomer Bellow Seals R18

  • Temperature: -20℃ to 150℃, dependent on the elastomer
  • Pressure: Up to 8 bar
  • Speed: Up to 10 m/s
  • End play/axial float allowance ±0.1mm

Sizes of Elastomer Bellow Seals R18

1/2” to 3”

Materials Combination of Elastomer Bellow Seals R18

  • Face: Carbon, SiC, TC
  • Seat: Ceramic, SiC, TC
  • Bellow: NBR, EPDM, VITON etc.
  • Spring: SS304, SS316
  • Metal parts: SS304, SS316

Specification of Elastomer Bellow Seals R18

Elastomer Bellow Seals By Size  d D D1 L1 L2
R18-1/2" 12.7 23.88 25.4 7.92 20.82
R18-5/8" 15.875 26.7 31.75 10.29 22.43
R18-3/4" 19.05 31.09 34.93 10.29 22.43
R18-7/8" 22.225 33.4 38.1 10.29 24
R18-1" 25.4 43.18 41.28 11.1 25.6
R18-1 1/8" 28.575 46.28 44.45 11.1 27.17
R18-1 1/4" 31.75 49.4 47.63 11.1 27.17
R18-1 3/8" 34.925 52.58 50.8 11.1 28.78
R18-1 1/2" 38.1 55.8 53.98 11.1 28.78
R18-1 5/8" 41.275 62.2 60.33 12.7 35.15
R18-1 3/4" 44.45 66 63.5 12.7 35.15
R18-1 7/8" 47.625 66.6 66.68 12.7 38.3
R18-2" 50.8 73 69.85 12.7 38.3
R18-2 1/8" 53.9 73.3 76.2 14.27 43.05
R18-2 1/4" 57.1 78.41 79.38 14.27 43.05
R18-2 3/8" 60.3 82 82.55 14.27 46.25
R18-2 1/2" 63.5 84.87 85.73 14.27 46.25
R18-2 5/8" 66.6 88.4 85.73 15.9 49.4
R18-2 3/4" 69.8 92.58 88.9 15.9 49.4
R18-2 7/8" 73 94.85 95.25 15.9 52.57
R18-3" 76.2 101.9 98.43 15.9 52.57

Design Drawing of Elastomer Bellow Mechanical Seals R18

Elastomer Bellow Seals R18
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