Although Rotolok manufactures a stock range of square outlet valves 165, 215, 265, 320, 370 and 420mm, mainly to match Screw Conveyor outlets, a full range of standard and heavy duty valves are made in versions: manual, rack and pinion, single and double pneumatic and motorised in sizes up to 1.8 x 1.4 m.

The Rotolok industrial range of slide valves are simple, but robustly designed to handle powders, pellets and granules over a wide field of applications. They may be operated manually, or by pneumatic means or electric motors, and offer reliable, continuous service with the minimum of attention and maintenance.

The standard range covers most needs, but the basic designs are capable of fabrication to any specified sizes and construction.