Rotork IB Bevel and IS Spur gearboxes

The IB Bevel and IS Spur gearboxes are now available to suit aggressive environment service including: buried, submersible, marinised and raw sewage duty. To achieve these ratings, the specifications include: stainless steel fasteners, stainless steel input shaft, two-pack polyamide epoxy surface coatings and an IP68 enclosure rating.

Other gearboxes with fewer specifications can fail in these highly corrosive environments, causing additional cost and downtime for the end user. Rotork gearboxes use careful material selections and design features to provide service in critical and hostile applications.

The IB and IS gearboxes are typically used with gate, knife gate, sluice gates, penstock and globe valves. Gearboxes are used to reduce the effort required to open and close valves manually and mitigate the OHS issues associated with the high effort required by a single person operating large valves with high torques.

Rotork gearboxes are available in 19 models with various torques, thrusts and ISO 5211 flange interfaces for easy mounting to a wide range of valves. They can also accommodate the high thrust required for rising stem applications. They can operate in any position.

They are available with a wide range of ratios by means of additional spur input reduction attachment to suit most valve applications. The option of a twin inputs shaft creates a high ratio to break open the valve and a low ratio for the travel to reduce the number of turns.

Another feature of the design is a splined ‘knock out’ drive sleeve that can be removed for machining the stem thread, without needing the gearbox to be split. This has the benefit of saving time during fitting, without contamination of the sealed gearbox lubricant.

A range of modular accessories to suit the gearboxes is available including: hand wheels, chain wheels, stem covers, locking devices, torque limiting input devices, pedestal, stem extensions and various position indicators. The IB and IS ranges have the advantage of being suitable for motorisation at a later date if required.