Lee Products has introduced a range of Chek valves for use in purge air, water injection and liquid fuel applications, specifically for industrial gas turbines. The valves are available with or without a removable, washable Hi-Bar safety screen, the with-screen version being capable of handling differential pressures up to 518bar without collapse. Chek valves, which can operate at temperatures up to 230ºC, feature a stainless steel poppet design, which, in combination with a Vespel seat, allows high flow at low leakage.