Height adjustable inspection hydraulic manhole covers - C250 class - Seal in lands NBR
Seals in lands NBR
Technical design
| 0.5 | CCBR25BF-L |
| 0.7 | CCBR25AF-L |
| 0.7 | CCBR30BF-L |
| 0.7 | CCBR30AF-L |
| 1.1 | CCBR40BF-L |
Features
The seals of height adjustable inspection hydraulic manhole covers enable to obtain possibilities of height adjustment of the manhole covers while preventing the grounds from penetrating in the network. The height of adjustment is of 80 mm.
The rings, delivered with the manhole covers, are specific according to the diameter and to material of the extension.
The seals in elastomer are conditioned on pallets.
They are assembled on the extensions either by outside, or by the inside.
The rings are installed on the extensions without lubrication.
Except in the case of use of extensions PVC CR4, it is recommended to lubricate the surface of the ring in contact with the manhole cover.
| DN extension | Material | Position of the joint |
|---|---|---|
| 250 | PVC | External |
| 250 | Ductile iron | External |
| 300 | PVC | External |
| 300 | PVC (*) | Internal |
| 300 | Ductile iron | Internal |
| 400 | PVC | External |
(*) Ring of low hardness used for particularly thick PVC CR8
