Rotork Gears Completes Contract With Chinese Subsea Valve Industry

November 2013, Vol. 240 No. 11

Rotork Gears, the valve gearbox and valve accessory division of Rotork, has completed an important contract in China, working closely with Chinese valvemakers involved with subsea valve production.

Through its factory in China, Rotork Gears received and completed an order from the Shanghai Pudong Hanwei Valve Company that involved two WGS Series subsea gearboxes fitted to a double block and bleed valve for a natural gas pipeline in the Bohai Sea.

The 8-inch Class 600 valve is being installed a depth of 100 feet (30 meters) on a pipeline serving the Suizhong SZ36-1 oilfield, which is 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 tapered 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 368,800 lbs./ft. (500,000 Nm). They are self-locking and available with many gear ratios. For information visit

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