Description
Elastomer Mechanical seals E21R
| ITEM | PART NO. TO DIN 24250 | DESCRIPTION |
| 1.1 | 472 | Seal face |
| 1.2 | 481 | Bellows |
| 1.3 | 484.2 | L-ring (spring collar) |
| 1.4 | 484.1 | L-ring (spring collar) |
| 1.5 | 477 | Spring |
| 2 | 475 | Seat |
| 3 | 412 | O-Ring or cup rubber |
Features
- For plain shafts
- Single and dual seal
- Elastomer bellows rotating
- Unbalanced
- Independent of direction of rotation
- No torsion on bellows
Advantages
- Shaft protection over entire seal length
- Protection of seal face during installation due to special bellows design
- Insensitive to shaft deflections due to large axial movement ability
- Universal application opportunities
- Important material certifications available
- High flexibility due to wide offer on materials
- Suitable for low-end sterile applications
- Dimension adaptions and additional seats available
Operating range
Shaft diameter: d1 = 10 … 100 mm (0.39″ … 3.94″)
Pressure: p1 = 16 bar (230 PSI), vacuum … 0.5 bar (7.25 PSI), up to 1 bar (14.5 PSI) with seat locking
Temperature: t = -20 °C … +140 °C (-4 °F … +284 °F)
Sliding velocity: vg = 10 m/s (33 ft/s)
Admissible axial movement: ±2.0 mm (±0,08″)
Pressure: p1 = 16 bar (230 PSI), vacuum … 0.5 bar (7.25 PSI), up to 1 bar (14.5 PSI) with seat locking
Temperature: t = -20 °C … +140 °C (-4 °F … +284 °F)
Sliding velocity: vg = 10 m/s (33 ft/s)
Admissible axial movement: ±2.0 mm (±0,08″)
Materials
Seal face: Carbon graphite antimony impregnated (A), Carbon graphite resin impregnated (B), Silicon carbide (Q1, eSiC-Q7)
Seat: Silicon carbide (Q1, eSic-Q7), Tungsten carbide (U3)
Elastomer: NBR (P), EPDM (E), FKM (V),
HNBR (X4)
Metal parts: CrNiMo steel (G), Hastelloy® (M)Further materials upon request.
Seat: Silicon carbide (Q1, eSic-Q7), Tungsten carbide (U3)
Elastomer: NBR (P), EPDM (E), FKM (V),
HNBR (X4)
Metal parts: CrNiMo steel (G), Hastelloy® (M)Further materials upon request.
Standards and approvals
- FDA
- WRAS
- KTW
- ACS
- W270
- NSF
Recommended applications
- Fresh water supply
- Building services engineering
- Waste water technology
- Food technology
- Sugar production
- Pulp and paper industry
- Oil industry
- Petrochemical industry
- Chemical industry
- Water, waste water, slurries
(solids up to 5 % by weight) - Pulp (up to 4 % otro)
- Latex
- Dairies, beverages
- Sulfide slurries
- Chemicals
- Oils
- Chemical standard pumps
- Helical screw pumps
- Stock pumps
- Circulating pumps
- Submersible pumps
- Water and waste water pumps
- Oil applications
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