FVF strainer is designed for heating, district heating and cooling systems. Strainer removes and retains foreign particles like welding beads, swarf, sand, etc. carried along by heating / cooling medium. Strainer is installed to protect sensitive equipment like meters, pumps, control valves against danger caused by foreign particles and in wide range of other applications. Furthermore, strainer is available with a plug, magnetic insert or ball valve. Combination with ball valve allowing a quick and efficient cleaning.