Rotork Gears, the valve gearbox and valve accessory division in the Rotork group of flow control businesses, has successfully completed the Chinese subsea valve contract.
Through its factory in China, Rotork Gears has been working closely with the Chinese valve-makers involved with subsea valve production to provide technical and engineering support, drawing on over 30 years’ experience of subsea gearbox design and manufacture. In early 2013, Rotork Gears secured an order from the Shanghai Pudong Hanwei Valve Company. The contract involves two WGS Series subsea gearboxes fitted to a double block and bleed valve for a natural gas pipeline in the Bohai Sea. The 8” Class 600 valve is being installed a depth of 30m on a pipeline serving the Suizhong SZ36-1 oilfield and operated by the China National Offshore Oil Corporation (CNOOC).
Designed for heavy-duty subsea applications, the Rotork WGS quarter-turn gearbox features a worm shaft supported on taper roller bearings, a high-strength alloy steel worm screw and a membrane or piston-type pressure compensator to enable operation at any depth. Gearboxes can be equipped with a high-visibility position indicator, vertical or horizontal ROV inputs and a handwheel for diver operation. WGS gearboxes are permanently lubricated and designed for output torques of up to 500,000 Nm.