PP – D Dual Seals (Pulp & Paper)
Product Description
- Dual seal configuration
- Balanced design
- Independent of direction of rotation
- Semi-Cartridge construction
- Double pressure balanced design
- Designed with provision for internal
barrier fluid circulation - No dynamic O-Ring on the shaft
- Robust construction with shrink-fitted
seal faces - Seal faces have a large clearance to
the shaft - Static springs on both the sides
- PP – D Dual Seals (Pulp & Paper)
Details | |
---|---|
Item No. | Description |
1 | Seal face |
5 | Seat |
13 | Sleeve |
16 | Housing |
18 | Pin |
37 | Assembly fixture |
2, 12, 15, 22, 23, 24, 25 | O-Ring |
43 | Plug |


- Seals can be operated with pressurized buffer fluid or with quench
- O-rings are dynamically loaded to prevent shaft damage
- Easy and trouble-free installation
- Due to large radial clearance, the damage to the seal faces are avoided, in addition to the seal faces being protected by strong steel parts
- Misalignment during installation and operations is reduced due to the static springs on both the faces
- Dual seal can also be used as a single seal by removing the atmospheric seal parts
- Pulp and paper industry
- Chemical industry
- Clean, abrasive or corrosive liquids
- Stocks of various kind
- Applications where crystallization is a problem
- Ahlstar UP A MS21 range of pumps
- Sulzer A, APP/APT pumps
- Sulzer SL mixers
- Metso conical refiners
- Stock pumps
- Seal face: Silicon carbide (Q12), Carbon (A)
- Secondary seals: FKM (V), EPDM (E), FFKM (K)
- Metal parts: CrNiMo steel (G), Grade 5A (4T), SMO 654 (4U)
- Temperature: t = -20 °C ... +140 °C (-4 °F ... +284 °F) (180 °C (356 °F) with FFKM elastomers)
- Pressure: p1 ... 25 bar (363 PSI), p3
- Speed= 20 m/s(66ft/s)
- Non-flow operation: Temperature: t = +5 °C ... +100 °C (+41 °F ... +212 °F)
- Pressure: p1 max. 10 bar (145 PSI), p3 > p1
- Sliding velocity: vg ... 20m/s (66 ft/s)