Vahn-Tech Series DOBF is a cost-effective butterfly valve solution for isolation valve applications. Providing lighter weight, smaller face-to-face, and simple quarter-turn rotary movement, a double-offset butterfly valve design is a great solution for zero-leakage isolation relative to ball valves for large sizes. With the eccentric disc designed to reduce the rubbing of the seat it drastically reduces torque requirements for actuation while extending seat life expectancy.
Additional information
| Valve Size | 2" to 72" |
|---|---|
| Pressure Class Standard | ASME B16.34 |
| Pressure Class Range | 150, 300, 600 |
| Body | Wafer, Double Flange |
| End Connections | Lugged, Integral Flange, Flangeless |
| Face-to-Face Standard | API 609 |
| Bonnet | Body Integral |
| Packing | Stuffing Box, Fugitive Emissions (ISO 15848), Live-Loaded, Fire-Safe |
| Configuration | Double-Offset |
| Trim | Eccentric Disc |
| Trim Characteristics | Quick-Opening |
| Seating | Soft & Metal-to-Metal |
| Shut-Off Classification | API 598 |
Features & Benefits
- Contact free sealing between seat and disc during open / close or interim positions
- No abrasion point either on the upper or lower parts of seat as well
- Lower Torque Values resulting in low torque gear operators or actuators
- Seat shape specially designed with unique dynamic load PTFE seal providing good elasticity and high reliability
- Sealing can be maintained without the need of adding O-Ring or metal backing ring
- The lip type sealing structure can compensate for the changes of temperature and pressure during operation
- Bi-directional bubble-tight leakage to API 598 or ISO 5208
- Superior flow characteristic in throttling applications with linear flow characteristic curve
- Stem shaft is designed with anti-blowout structure to prevent stem injection in case of pressure surge
Standards & Certifications
| Certifications | Canadian Registration Number (CRN) |
|---|---|
| Fire-Safe to API 607 | |
| Design Standards | API 609 – Butterfly Valves: Double-Flanged, Lug and Wafer |
| ASME B16.10 – Face to Face & End Dimenions of Valves | |
| ASME B16.5 – Pipe Flanges & Flanged Fittings | |
| ASME B16.47 – Large Diameter Steel Flanges | |
| ASME B16.34 – Valve Flanged, Threaded, and Welding End | |
| ASME SA Materials | |
| ASTM A Materials | |
| Quality | IS0 9001:2015 |
