コベルコ建機 SK200-3 Control Valve

Negative Flow Control (NFC): The control valve regulates the variable displacement pump using a return pressure signal. When the control lever is in the neutral position, feedback pressure is high, causing the pump displacement to drop to a minimum; this significantly reduces the engine load during idling. Pressure Compensation Logic: The valve assembly features a sophisticated internal pressure-balancing design. This ensures that when multiple functions are performed simultaneously (combined operations), the speed of each function remains proportionally balanced, preventing any single function from monopolizing the hydraulic flow. Durability and Craftsmanship: Although this model is older, the valve body casting and spool grinding techniques employed by Kobelco at the time were exceptional. This explains why many SK200-3 units remain operational in mines and at construction sites to this day. Guangzhou Jianming Machinery Equipment Co., Ltd. With 20 years of solid practical experience, we are experts in the field of machinery power systems and components. We began as a small machinery repair shop. Over the past two decades, we have accumulated a wealth of successful global case studies and maintenance expertise. Drawing on our frontline experience in resolving complex mechanical issues, we have earned widespread acclaim and grown into a comprehensive enterprise employing over 200 professionals. We deeply understand the challenges equipment faces under extreme conditions and possess extensive practical experience and expertise in the following areas: Heavy Machinery Power Upgrades and Retrofitting: We provide customized engine replacement and overhaul solutions for various types of construction machinery, with particular expertise in the restoration and tuning of Yanmar 4TNV series power platforms. Mining and Industrial Equipment Maintenance: We offer professional power optimization and fault diagnosis strategies to ensure equipment remains operational under heavy-load conditions. Agricultural and Irrigation Power Systems: We provide power unit upgrades and comprehensive troubleshooting services for various small agricultural machines and irrigation/drainage equipment. Leveraging our extensive technical experience, we are also a robust supplier of spare parts: Comprehensive Machinery Parts Supply: We offer a wide, carefully selected range of construction machinery parts—including fuel injectors, piston and connecting rod kits, precision cylinder heads, engine overhaul gasket sets, and durable crankshafts—to fully meet your one-stop procurement needs. Our extensive practical experience and robust supply chain system are our most valuable assets. Whether you are facing complex mechanical challenges or need reliable spare parts, Jianming Machinery has the expertise to help you succeed! Please contact our sales representative, Mr. Zhan. WeChat/WhatsApp: +86 180 2712 4770