Item Description
1 Seal face, stationary
2 Seat, rotating
3 Sleeve
4 Metal bellows cartridge unit
5 Shaft sleeve
6 Housing (size matched to installation space)
7 Clamping ring

TDGS

Features

  • Gas-lubricated
  • Uni-directional or bi-directional
  • Elastomer-free, no dynamic O-ring
  • Ready-to-fit cartridge unit
  • Single seal available

Advantages

  • Wear-free and contact-free operation
  • Self-cleaning 3D gas grooves
  • High gas film stiffness
  • Extremely low steam leakage
  • Bearing oil not contaminated with condensed steam

Operating range

Shaft diameter:
ds = 40 ... 140 mm (1.57" ... 5.51")
Pressure:
p = 0 … 10 bar (0 … 145 PSI)
Temperature:
t = -50 °C … +450 °C
(-58 °F … +842 °F)
Sliding velocity:
vg = 130 m/s (427 ft/s)

Materials

Seal face: Carbon graphite
Seat: Silicon carbide

Standards and approvals

  • NACE

Notes

The gas seal for single-stage steam turbines. A metal bellows allows it to work reliably even at high temperatures. Any steam leakage that does occur will be just a fraction of the leakage from carbon ring seals. This both saves energy and improves the performance of the turbine. The bearing oil is no longer contaminated by condensed steam, extending the bearing life and reducing maintenance costs accordingly.

Dimensions on request.