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The parts for the directional control valve in the hydraulic directional control system, the application in the field of all hydraulic directional control, in great demand.

Technical conditions: oil hole surface flatness, 0.002 to 0.003; Oil hole Rmax6.3 joint surface roughness; Valve core hole size 12 – Φ Φ 14; Valve core hole with two face runout of 0.10-0.20; The valve core hole roughness: Ra0.3; Valve core hole cylindricity: 0.002-0.003.