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Combined stuffing-box sealing ring USmd (substitute 621)

  • Item 1: USm modified sealing ring (sealing part – material: thermoplastic polyurethane TPU, hardness 90±2 ShA)
  • Item 2: PPW anti-extrusion ring (material: polyacetal POM)

Conditions of use​

Operating pressure [MPa] 16 25 50
Continuous exposure temperature [°C] 80 50
Smax. W=8.5 [mm] 0.5 0.3
W=14.5 1.0 0.5
W=16.5    W=18 1.0 0.5
  • Hydraulic medium:
    • mineral oils
    • oil-water emulsions HFA and HFB classes (up to 50 °C)
  • Maximum operating speed [m/s]:
    • continuous: 0.2
    • intermittent: 0.5

Ordering example​​​​​​​

  • USmd Ring 110 × 125 × 12
    (d × D × W)

Comments

  1. Special versions of seals are available:
    • for continuous operation (in oil) at temperatures up to 100 °C.
    • with nominal dimensions other than those specified in the standard range.
Type sizedxdxW Inside diameterd Outside diameterD Groove widthL Assembly chamfera
40x52x8.540529.65.0
50x62x8.550629.65.0
60x72x8.560729.65.0
63x77x8.563779.65.5
70x82x8.570829.65.5
80x95x14.5809516.06.0
90x105x14.59010516.06.0
100x115x14.510011516.08.5
110x125x14.511012516.08.5
120x135x14.512013516.08.5
125x140x14.512514016.08.5
140x155x14.514015516.09.5
150x165x14.515016516.010.5
160x175x14.516017516.010.5
180x195x14.518019516.010.5
190x205x14.519020516.010.5
195x210x14.519521016.010.5
200x220x14.520022016.010.5
210x230x14.521023016.010.5
220x240x14.522024016.010.5
230x250x14.523025016.010.5
240x260x14.524026016.012.5
260x280x16.526028018.012.5
285x310x1828531020.012.5
290x310x16.529031018.012.5
305x325x16.530532518.012.5
325x355x1832535520.012.5
335x355x16.533535518.012.5
350x375x1835037520.012.5
355x380x1835538020.012.5
370x395x1837039520.012.5
380x405x1838040520.012.5