Findmall Hydraulic Valve Hydraulic Directional Control Valve Double Acting Valve Double Acting – Hydraulic control valve for operating double acting cylinders. Durable Quality – This hydraulic directional control valve comes with 4 spool, with cast iron construction for long-time use. Spring Return – All spools are standard double acting with spring return to the neutral position which is ideal for double-acting cylinders. High-Efficiency – The relief valve range is up to 3600 PSI and the maximum flow is up to 21 GPM. Wide Application – Fit for small tractors, tractors loaders, log splitters, and etc.