Abstract: A single handle mixer valve with hard material plates, wherein a fixed member forming a delivery connection for mixed water projects up to the level of the movable plate of the valve, whose cavity forming the duct for water passage encircles the delivery connection by engaging the same, in order to offer a guide for the swinging displacements of the movable plate, while the delivery connection acts as a fulcrum therefor. The cavity of the plate may be blind or it may tranverse right through the plate, which in this latter case sealingly cooperates with a control head which closes the cavity. Preferably the delivery connection is a part of a supporting member for the fixed plate of the valve; a member of a wear resistant material having a low friction coefficient is inserted within the cavity of the movable plate; and some portions of this latter member, the control head or the movable plate itself are shaped so as to exert a preclosure action.