Airochem makes rotary airlock valves are available in a standard range of 150mm to 750mm dia. Models as per are 12059-1987 suitably designed for applications like handling lumps, chips, fibres, hard granules powder, cement etc. The body is made of closed grain cast iron up to sizes of 450 mm & thereafter fabricated either from carbon steel plate or erosion-resistant material & are closely machined.