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| Item | Parts no. toDIN 24250 | Description |
|---|---|---|
| 1.1 | 472 | Sliding face |
| 1.2 | 412.1 | O-Ring |
| 1.3 | 474 | Thrust ring |
| 1.4 | 485 | Drive collar |
| 1.5 | 477 | Spring |
| 1.6 | 904 | Set screw |
| 2 | 475.1 | Seat |
| 3 | 412.3 | O-Ring |
1) d1 > 105: 2 mm x 30°
2) d1 > 105: 30°
3) d1 > 105: +0.1
4) d1 > 105: H7
5) 3 x 120°
CGSH-K
Features
- For stepped shafts
- Balanced
- Rotating spring
- Single or double seal available
- Standard version with U-grooves, V-grooves optional (dependent of direction of rotation)
- Gas-lubricated
- Does not open in the event of buffer pressure failure, self closing at pressure reversal
Advantages
- Contact-free operation, no friction
- No differential pressure required with hard/soft material combination
- Applicable as containment seal acc. to API 682
Operating range
Shaft diameter:
d1 = 28 ... 125 mm (1.10" ... 4.92")
Pressure: p1 = 25 bar (363 PSI)
Temperature:
t* = -20 °C ... +170 °C (-4 °F ... +338 °F)
Sliding velocity:
vg = 4 ... 25 m/s (13 ... 82 ft/s)
* Depending on resistance of O-Rings
Materials
Seal face: Carbon graphite antimony impregnated (A), Silicon carbide (Q2),
alternatively: Carbon graphite resin impregnated (B), Silicon carbide (Q1)
Seat: Silicon carbide (Q1, Q2),
Silicon carbide (Q19, Q29) with seal face in Q1 resp. Q2
Metal parts: CrNiMo steel (G)
Standards and approvals
- EN 12756
- API 682 / ISO 21049
- Compliant to TA Luft (German Clean Air Act)
Recommended applications
- Gases and liquids
(single seals only gas) - Gases and liquids which must not get into the atmosphere (dual seal)
- Gases not harmful to the environment (single seal)
- Chemical industry
- Refining technology
- CCUS
- Hydrogen
- Sustainable plastics production
- Fans
- Small steam turbines
- Blowers
- Roots compressors
- Pumps
Product variants
CGSH-KD
Double seal back-to-back, buffered with gas, according to API 682 configuration 3NC-BB, Plan 74. Items, descriptions and unspecified dimensions as for CGSH-K.
Pressure: p1 = ... 22 bar (319 PSI), p3 = ... 25 bar (363 PSI)
(over the whole nominal diameter range, higher values on request).
Differential pressure Δp = min. 3 bar (44 PSI)
Other operating limits as CGSH-K.
CGSH Tandem arrangement
acc. to API 682 3rd Edition.
Configuration: 2CW-CS, API Plan 72, API Plan 75, API Plan 76.
For media with a gaseous leakage. H75VN on the product side. In case of a failure, the CGSH on the atmosphere side works as a liquid seal.
