Gear Operated Lug Butterfly Valve
A Gear Operated lug butterfly valve is a lug-type butterfly valve whose disc is rotated by a handwheel-operated gearbox and fastened separately to flanges using threaded lugs; it can also be used as an end valve. The gearbox reduces the high opening torque required for large bore sizes when manual lever operation is difficult; it enables slow and controlled opening and closing, reducing the risk of water hammer and allowing the disc to be held at a desired position to throttle flow.
The gearbox body is epoxy-coated ductile iron with ISO 5211 connection; a position indicator on it shows the valve opening. Available in sizes DN25–DN600 with stainless steel, nickel-plated or bronze disc and EPDM, NBR, Viton or PTFE seat options. Up to DN300, rated for PN16; larger sizes rated for PN10; compliant with TS EN 593.
Benefits
- Easy operation on large bore sizes with low control force
- Reduced water hammer risk through slow closing
- Ability to throttle flow by holding at intermediate position
- Mechanical position indicator
- Various disc and seat options
Applications
- Large bore water transmission and distribution lines
- Pump stations
- Heating, cooling and HVAC main lines
- Treatment plants
Technical Specifications
| Nominal diameter | DN25–DN600 |
|---|---|
| Working pressure | PN16 (up to DN300); PN10 (DN350–DN600) |
| Actuation | Handwheel-operated gearbox |
| Gearbox body | Epoxy-coated ductile iron, ISO 5211 |
| Ambient temperature (gearbox) | -20 °C … +70 °C |
| Connection | Lug (threaded ear) |
| Standard | TS EN 593 |
Materials
| Body | GG-25 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 |
| Seal | EPDM, NBR, Viton (FKM) or PTFE |
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