The Rotork BR range is a bronze worm gear operator made from cast aluminium bronze and stainless steel, designed for extended life operation of valves in corrosive manhole and vault steam distribution environments where road salts, standing water and elevated temperatures are common. Torque goes up to 7,000 Nm (5,163 lbf.ft).
| Type | Bronze worm gear operator |
| Material | Cast aluminium bronze and stainless steel |
| Torque Range | Up to 7,000 Nm (5,163 lbf.ft) |
| Ratios | 34:1 to 217:1 |
| Temperature Range | Up to +200 °C (+392 °F) |
| Environment | Corrosive manhole and vault steam distribution environments where road salts, standing water and elevated temperatures are common |