Grundfos Multi-Stage Pump Slow Wire Mechanical Seal for SPK2/4/8/16 CRK-12mm
Product Overview
Mechanical seal designed for GF pumps with standard sizes of 12mm and 16mm. Standard material configuration features Tungsten carbide/Tungsten carbide/FKM elastomer.
Application Models
For Shaft Size 12mm Pumps: CRK2, CRK4 (CRK2/4AUUV)
For Shaft Size 16mm Pumps: CRK8, CRK16 (CRK8/16AUUV, CRK8/16, CRN8/16)
Technical Parameters
| Parameter |
Specification |
| Temperature |
-30℃ to +180℃ (dependent on elastomer) |
| Pressure |
≤ 2 MPa |
| Speed |
≤ 12 m/s |
| Medium |
Chemical raw materials |
Material Composition
| Component |
Material |
| Rotary Ring |
SIC CAR CE TC |
| Stationary Ring |
SIC CAR CE TC |
| Spring |
SUS304/SUS316 |
| Stationary Seat |
SUS304/SUS316 |
| Secondary Seal |
FKM/EPDM |
| Rotary Ring Holder |
SUS304/SUS316 |
Installation Preparation
- Shaft Outside Diameter tolerance: ±0.05mm
- Shaft run out: < 0.1mm
- Shaft end float: < 0.13mm
- No sharp edges on the shaft over the O-ring
Note: During installation, avoid scratching or damaging the O-ring. If any damage occurs, contact us for replacement.
Installation Instructions
The complete cartridge seal set is cleaned and passes leakage examination before sale. To avoid damage, do not disassemble and clean parts again before installation.
- The fitting allowance between seal and shaft is dl h6 0.8. Provide a leading edge at the shaft end.
- The shaft outside diameter at screw position should be 0.1-0.2mm smaller to resist screw over-tightening.
- Lubricate the shaft with oil before installation.
- Place the cartridge seal into the pump chamber, then:
- Tighten four screw bolts of flanges, ensuring medium leading in hole "G" is at the top position
- Tighten four set screws to position the shaft sleeve on the shaft
- Remove four gauge plates (keep for future installation and disassembly)
- Connect the medium lead-in pipe with hole "G" to flush away friction heat and flush the seal chamber during pump operation
Important: After complete installation, turn the shaft by hand to check rotation. If the shaft does not rotate smoothly, the seal has been improperly installed.
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