Hydraulic valve manifolds are made of 45 steel or aluminum (grade 6082 - T4 in oil Manifold, 6061), by six -sided machining processing, milling, grinders grinding, CNC machining, drilling machine processing, inspection, surface phosphate (or plated every product of nickel) processing, final inspection of the quality inspection department and a series of processes to ensure the factory's quality standards, in line with the requirements of the oil pressure.