Gear Operated Lug Type Butterfly Valves
A gear-operated lug butterfly valve combines a threaded lug body with a handwheel worm gearbox. Because the body is bolted to each flange separately, the valve can keep holding pressure on one side while the other side of a large line is taken out for maintenance.
On large discs that are hard to turn with a lever, the handwheel turns the disc slowly through the gearbox. The valves in this group come with grey iron bodies and nickel-plated ductile iron, stainless steel or bronze discs from DN25 to DN600, in PN16 up to DN300 and PN10 above.
Main Applications
- Main isolation before and after pumps in pumping stations
- Maintenance isolation of large strainer and filter banks
- End-of-line isolation at water tank and basin outlets
- District isolation valves at mains connections
- Ends of main cooling water headers
- Seawater intake lines (bronze disc type)
Technical Data
| Connection | Lug; threaded lugs, separate bolts per flange |
|---|---|
| Size range | DN25–DN600, depending on model |
| Pressure class | PN16 (DN25–300) · PN10 (DN350–600) |
| Medium temperature | EPDM −10 / +130 °C · NBR −10 / +80 °C |
| Lug threads (PN16) | DN50: 4×M16 · DN80–DN125: 8×M16 |
| Gearbox | Quarter-turn worm gear, handwheel, ISO 5211 mounting |
| Gearbox output torque | DN200–250: 700 Nm · DN300–350: 1200 Nm · DN400–450: 2500 Nm · DN600: 4000 Nm |
| Handwheel diameter | 300 mm (DN200–350) · 400 mm (DN400–450) |
| Position indicator | On the gearbox, open-closed |
| Stroke adjustment | 5% |
| Gearbox body | Epoxy-coated ductile iron, −20 / +70 °C ambient |
| End-of-line use | Possible; permissible pressure depending on model |
Material Options
| Part | PN16 · GG25 body, nickel-plated disc | PN16 · GG25 body, stainless disc | PN16 / PN10 · ductile iron body, bronze disc |
|---|---|---|---|
| Valve body | Grey cast iron GG25, threaded lugs | Grey cast iron GG25, threaded lugs | Ductile iron GGG-40.3, threaded lugs |
| Disc | Nickel-plated ductile iron GGG-40.3 | Stainless steel AISI 316 | Aluminium bronze |
| Stem | SS420 (DN25–300) · SS431 (DN350–600) | SS420 (DN25–300) · SS431 (DN350–600) | SS420 (DN40–300) · SS431 (DN350–600) |
| Seat / liner | EPDM | EPDM | NBR |
| Gearbox body | Epoxy-coated ductile iron | Epoxy-coated ductile iron | Epoxy-coated ductile iron |
| Medium temperature | −10 / +130 °C | −10 / +130 °C | −10 / +80 °C |
The nickel-plated disc type is used in closed heating and cooling water, the stainless disc type in chlorinated and mildly corrosive water and the bronze disc type in seawater. Sizes DN350 and above are produced with gearbox only.
Advantages
Holds Pressure During Maintenance
- One flange can be opened while the other stays connected.
- Equipment is removed without draining the whole line.
Manual Operation on Large Sizes
- The gear ratio multiplies handwheel force.
- Operated by one person up to DN600.
Aligned Installation
- Lug holes keep the axis with the flange.
- Safer installation of large, heavy bodies.
Field Adjustment
- 5% end position adjustment and indicator.
- Closed position is fine-tuned to the liner.
Construction and Design Features
- Threaded-lug body into which each flange bolt is screwed separately, with elastomer liner
- Worm gearbox connected to the stem with ISO 5211 flange
- Handwheel, position indicator and end position adjustment screws
- Epoxy-coated ductile iron gearbox body
- Stainless steel stem
Request a quote for gear-operated lug butterfly valves by stating size, flange standard, disc material and whether the valve will be used at a line end.
How to Choose?
- Clarify the removal scenarioChoose the geared lug type if the pump or strainer on one side will be removed separately.
- Check gearbox torqueConfirm that the valve torque at maximum pressure does not exceed the gearbox output torque.
- Locate the handwheelOn large sizes the handwheel grows to 300–400 mm; leave enough clearance around it.
- Prepare bolt setsUse a separate stud or bolt set for each flange to match the lug thread size.
Complementary Products
Why ORFA?
Other Butterfly Valves
Double Acting Pneumatic Lug Butterfly Valves
Double acting pneumatic lug butterfly valves are lug body valves opened and closed automatically by an actuator driven by air in both directions.
Details →
Double Acting Pneumatic Wafer Butterfly Valves
Double acting pneumatic wafer butterfly valves are wafer body valves automatically controlled by an actuator driven by air in both directions.
Details →
Electric Actuated Lug Type Butterfly Valves
Electric actuated lug type butterfly valves are lug body valves opened and closed remotely by an electric actuator.
Details →
Electric Actuated Wafer Butterfly Valves
Electric actuated wafer butterfly valves are wafer body valves controlled remotely or automatically by an electric actuator.
Details →
Lug Type Butterfly Valves
Lug type butterfly valves have threaded lugs, so they can be used at line ends and one side can be dismantled.
Details →PVC-U and PPRC Butterfly Valves
PVC-U and PPRC butterfly valves have corrosion resistant plastic bodies and are used in water treatment and chemical lines.
Details →
Gear Operated Wafer Butterfly Valves
Gear operated wafer butterfly valves are wafer body valves with a handwheel and gearbox for easy operation in large sizes.
Details →
Single Acting Pneumatic Lug Butterfly Valves
Single acting pneumatic lug butterfly valves are lug body valves whose spring return actuator moves to a safe position when air fails.
Details →
Single Acting Pneumatic Wafer Butterfly Valves
Single acting pneumatic wafer butterfly valves are wafer body valves whose spring return actuator moves to a safe position when air fails.
Details →
Wafer Type Butterfly Valves
Wafer type butterfly valves are lightweight, compact butterfly valves clamped between two flanges.
Details →Our Gear Operated Lug Type Butterfly Valves
ORFA supplies gear operated lug type butterfly valves in a range of pressure classes, sizes and connection types to suit your application. Descriptions, technical specifications, materials and dimension tables are available on each detail page.
Get a quote for your project
Our sales team will prepare the best solution for your needs.