Tyco has announced that its specialist Dewrance valves are providing steam control for the new generation of commercial solar power plants in southern Europe and the USA. The Dewrance range of extraction check valves have been specifically designed for installation in bled steam lines between steam turbines and feed water heaters. The design prevents the reverse flow of stored steam and any water from the heater, or its bled steam pipe, to the turbine. The Dewrance extraction check valve has unique geometry comprising a conical seat and disc for a tight seal without scuffing. The combination of disc geometry and body shape produces a seat angle which delivers short disc travel, keeping the valve fully open over a wide range of flows. This design is suitable for conditions from sub-atmospheric bled steam up to ANSI 2500 class for steam and water. The check valve can be fitted with a direct mounted, quick closing pneumatic actuator which acts directly on the disc. Each actuator is specifically designed for its particular application.