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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, heat generators (wall-mounted boilers, solid fuel generators, heat pumps), white goods (washing machines). 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 chrome plated valve is the compactness that allows its installation even in little spaces and the installation without using any key.