Z50 series are monoblock directional control valves and manufactured with up to seven levers. There are grooves and notches on Z50 spools. These grooves and notches provide lubricating oil film, less internal leakage and smooth transaction between working ports.* Spool is open center “A†spool with spring return. Working port threads (A & B) are G 3/8″.* Max. Pressure P: 315 bar, T: 50 bar, A-B: 300 bar