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Barberi® check valves are monodirectional devices, allowing the backflow prevention of fluid under pressure. According to the model, they are normally used in domestic water installations, booster pump systems, heating systems, central heating systems, heat generators (wall-mounted boilers, solid fuel generators, heat pumps), thermal solar systems, generic industrial and agricultural water systems. Sealing is permitted through forces exerted by a spring and by the fluid pressure against a gasket which guarantees the seal even at very low back pressures. Moreover, the force of the spring allows the valve to have a universal characteristics concerning the installation position. The peculiarity of this valve is the presence of a pump connection and a side connection. The side connection can be used as by-pass, as pipe drain downstream of the valve or simply as a connection. The valve is normally installed downstream of a pump or circulator to avoid draining of the piping when the pump is off (booster pump systems), to allow pump maintenance without draining the system, to work as anti-thermosiphon device (heating systems).