The product
Dembla High Performance Butterfly Valves are available in Wafer and Lug type designs conforming to API 609 standard. The Disc construction is Double Offset providing excellent controllability, bubble tight shut off, greater seat life and smooth operation.
Well supported shaft with heavy duty bearings ensure perfect alignment of seat and disc for smooth and trouble free operations. Valves have been rigorously tested to ensure industry performance requirements.
Size & Rating
| PN6 | 128 Inch | DN 3200 |
| PN10 | 80 Inch | DN 2000 |
| #150 | 60 Inch | DN 1500 |
| #300 | 36 Inch | DN 900 |
Features
- Valves designed to achieve bi-directional tight shut-off for sizes up to 3000 NB ( with Elastomer soft seat)
- Wide choice of various seat moe: EPDM I VITON I PTFE I RPTFE (GFT) I SS316
- Anti Blow-out stem design
- Wafer, Lugged and Double Flanged design
- Positioners
Standards
| Design | F/F | Testing | Fire Safe | End Connection |
| API-609/ASME-B-16.34 | API-609/EN 558 | API-598/EN-12266, FCI 702 | API-607 | FLANGE/WAFER/ LUG-B16.5, B16.47, EN1092-1 BUTTWELD-B16.2 |
Specifications
| Valve Sizes | 2″ (50mm) to 120″ (3000mm) |
| Ratings | Class 150, Class 300, Equivalent to DIN PN2.5, PN6, PN10, PN16, PN25, PN40 |
| Body Style | Flanged ( 2″ to 128″ Only) & Lugged & Wafer ( 2″ to 80″ Only) |
| Seat Leakage Option | Class VI for PTFE, EPDM, Viton Soft Seats, Class IV for Flexible Metal Seats |
| Flow Direction | Bi-Directional |
Conformity To Codes
| Design & Manufacturing | API 609 Category B BS 5155 API 607 (Fire Safe) |
| Face to Face Dimensions | API 609 BS 5155 BS EN 558-1 ISO 5752 |
| Flange Dimensions | ANSI B 16.5 (DN 50 to DN 600) ANSI B 16.47 (DN 650 to DN 1500) |
| Pressure Temperature Rating | ANSI B 16.34 |
| Valve Inspection | API 598 FCI 70-2 |
Application Industries
- Mining
- Ship Building
- Power Plants
- Paper and Pulp
- Water
- Pharmaceuticals
- Petrochemicals
- Oil and gas
- Food & Beverage
- Piping Systems
- Sugar Mills
- FPSO
- Chemicals & Natural Gas
- Gas Process
- Metal & Steel
