We've just finished some 1600mm diameter butterfly valves for Cemex.
They're custom designed and machined to a close tolerance finish to isolate ductwork in the main Cemex cement plant at Rugby.
The valves have stainless braced vanes and fabricated steel bodies with our simple yet very effective sealing sytem on both vane and shafts. The ultra-reliable Kinetrol pneumatic actuator powers the valve and it's fitted with a 4-20mA positioner to control the vane position.
It's also ATEX rated to zone 22.