As the primary control valve for HC25 Hydraulic Rock Drills, the Valve 86600632 regulates oil flow to adjust impact frequency and rotation speed, directly influencing drill efficiency. Generic control valves suffer from rapid  wear—often within 1500-1800 hours—due to low-hardness materials and imprecise machining. This OEM valve features a hardened  (HRC 50-55) with a mirror-polished sealing surface (Ra≤0.2μm), minimizing friction and wear. Its internal oil channels are precision-bored to reduce flow resistance, ensuring consistent performance until replacement is needed for blockage or leakage.