Resilient-seated, centric butterfly valve with triple shaft bearing and replaceable rubber liner — available as wafer-type (300-W) for installation between pipe flanges, or lug-type (300-L) for bolted flange connection to pipelines and end-of-line service. DN 50–600, PN 10/16. Stable full shaft, self-lubricating bearing bushes, vacuum tight to 0.1 bar absolute. The disk is available in ductile iron (wastewater) or stainless steel (water). Compatible with electric, pneumatic, or manual actuators.
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▸ Key Features
- Centric disk mounted in three maintenance-free, self-lubricating bearing bushes (triple shaft bearing)
- Replaceable rubber sleeve (liner) with integrated seal, mounted on vulcanised seal carrier ring
- Stable sealing seat due to collar with vulcanised support ring
- Functionally reliable use with flared flanges, welding flanges, PE flanges, and loose flanges with V-collar
- Vacuum tight up to 0.1 bar absolute
- Tight in both flow directions
- Blow-out proof shaft, sealed with O-ring
- Premium epoxy coating (min. 250 µm) for maximum corrosion protection
- Lug-type (300-L) suitable for end-of-line service with counter-flange
▸ Technical Specifications
| Parameter | CEREX® 300-W (wafer) | CEREX® 300-L (lug) |
|---|---|---|
| Valve type | Centric, resilient-seated, wafer-type | Centric, resilient-seated, lug-type |
| Nominal diameters | DN 50 – 600 | DN 50 – 600 |
| Nominal pressure | PN 10 / 16 | PN 10 / 16 |
| End-of-line pressure rating | — | DN 50–300: 16 bar; DN 350–400: 14 bar; DN 450–600: 10 bar |
| Face-to-face length | EN 558, series 20 (DIN 3202 / K1) | EN 558, series 20 (DIN 3202 / K1) |
| Flanges | Between pipe flanges acc. to EN 1092-2 | Flange mounting to pipelines acc. to EN 1092-2 |
| Bearing | Triple bearing — three maintenance-free, self-lubricating bushes | |
| Vacuum tightness | Up to 0.1 bar absolute | |
| Leak-tightness | Tight in both flow directions | |
▸ Materials
| Component | Water Version | Wastewater Version |
|---|---|---|
| Body | Ductile iron EN-GJS-400-15 (GGG-40) | Ductile iron EN-GJS-400-15 (GGG-40) |
| Disk | Stainless steel 1.4408 | Ductile iron EN-GJS-400-15 (GGG-40), epoxy coated |
| Shaft end | Stainless steel 1.4021 | |
| Collar (liner) | EPDM | NBR |
| Coating | Body internally and externally epoxy coated (min. 250 µm) | |
▸ Available Variants
▸ Applications
- Water treatment (stainless steel disk, EPDM collar)
- Water distribution (stainless steel disk, EPDM collar)
- Wastewater (ductile iron disk, NBR collar)
- Dams
- Power plants
- Industry — facility construction, indoor plant installations