Gear-Operated Wafer Butterfly Valve
A gear-operated wafer butterfly valve is a wafer-type butterfly valve with its disc rotated by a handwheel gear box (reducer), clamped between two flanges with studs. The reducer lowers the high operating torque required for large sizes, allowing controlled and gradual opening and closing to reduce water hammer risk, and enables the disc to be held at a desired position to restrict flow.
The reducer body is epoxy-coated ductile iron with ISO 5211 connection; the position indicator shows the valve opening. Available from DN25 to DN600 with stainless steel, nickel-plated or bronze disc and EPDM, NBR, Viton or PTFE seat options. Operating pressure PN16 up to DN300, PN10 for larger sizes; compliant with TS EN 593 standard.
Benefits
- Easy operation on large sizes with low control force
- Gradual closing reduces water hammer risk
- Flow throttling capability at intermediate positions
- Mechanical position indicator
- Various disc and seat material options
Applications
- Large-capacity water transmission and distribution pipelines
- Pump stations
- Heating, cooling and HVAC main lines
- Treatment plants
Technical Specifications
| Nominal size | DN25 – DN600 |
|---|---|
| Operating pressure | PN16 (up to DN300); PN10 (DN350–DN600) |
| Actuation | Handwheel gear box (reducer) |
| Reducer body | Epoxy-coated ductile iron, ISO 5211 |
| Ambient temperature (reducer) | -20 °C … +70 °C |
| Connection | Wafer (between flanges) |
| Standard | TS EN 593 |
Materials
| Body | GG-25 grey cast iron or GGG40 ductile iron, epoxy-painted |
|---|---|
| Disc | AISI 316 stainless steel, nickel-plated ductile iron or aluminium bronze |
| Stem | AISI 420 stainless steel |
| Seat | EPDM, NBR, Viton (FKM) or PTFE |
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