Sempell Raisteam 3 Way Valves (Feed Water Heater Protection System)

These valves are designed to bypass high pressure feedwater around a group of heaters in the event of high-water level in the shell caused by a defective tube, weld or drain system.;Protection is achieved in the system by installing fast closing tee and changeover valves in the pipework around a heater or group of heaters.;One-piece body designed for temperature up to 648 °C;Extensive range (ASTM, DIN) of forged steel body and bonnet material;Internal passages designed for minimum pressure drop;Split stem (with separate coupling) to allow hand operation for commissioning and maintenance without having any effect on normal operation.; The motive power employed is the feedwater pressure and the system is designed to ‘fail safe’ in that the heaters will be by-passed if either electric or pneumatic supplies fail.