Power Pack valve VPH 15 E is multifunction unitwhich reduces the costs of connections andhoses/tubes by incorporating the functions of apressure relief valve and a directional controlvalve to provide a bypass function.The pressure relief function is designed to limitthe system pressure by draining surplus waterflow from the pressure side, and to protectsystem components against overload as a result of pressure peaks.The valves are electrically-activated ON/OFFvalves (closed (NC) or open (NO) when the coil is de-energized).The VPH 15 E valve is designed for use withdrinking water, i.e. water containing no additives of any kind. (See EU drinking water directive EU98/83/EC).