The Danfoss 003Z3159 6-way change-over valve, type RHQ, is engineered for efficient change-over between heating and cooling applications in 4-pipe fan coil units. This genuine Danfoss valve combines two 3-way valves within a single robust DZR brass housing. It features a DN 15 valve size with G 3/4 A external thread connections and a kvs value of 2.5 m³/h. Designed for media temperatures from 2 to 95 °C, it operates under a PN 16 pressure class with a maximum differential pressure of 100 kPa and a close-off pressure of 1600 kPa. The valve utilizes a stainless steel stem, PTFE seat, and EPDM O-rings for reliable performance. It is compatible with AMV(E) 13, AMV(E) 13SU, AMV(E) 23, and AMV(E) 23SU actuators.