The function of the non-return valve is to allowflow in one direction while blocking it in theother.The valve incorporates a conical poppet design,which ensures sealing with a low viscositymedium such as water.The Water must be clean (according to the EUdrinking water directives 98/83/EC) and must befree from abrasive sediments.The valves are available for flows of 30 l/min,60 l/min, 120 l/min. and 150 l/min.