–Used for open center systems (Pump to Tank Flow) – closed center option available. Package Including 1 x Hydraulic Directional Control Valve This monoblock valve is a hydraulic directional control valve. These valves are used to start and stop fluid flow into hydraulic cylinders or hydraulic motors. 2 Spool with Joystick Control, 21GPM flow, 3625 max PSI. Precision ground and hard chrome-plated spools assure a long life. High-tensile strength cast iron monoblock construction. Used for small tractors, tractors loaders, log splitters and other mobile. All spools are standard double acting with spring return to neutral position which are ideal for double acting cylinders.