Profile: Ningbo Best Industrial Co.,Ltd specializes in designing and manufacturing hydraulic components. We are an ISO 9001:2008 certified company. Our products include hydraulic power units, cartridge valves, hydraulic gear pumps, and hydraulic directional valves. Our products are widely applied for machinery industry, automation industry and hydraulic engineering applications. Cartridge hand pumps are provided with any mechanical hydraulic actuator (piston rods and rotating pump shaft). The shaft will become coated with a minute amount of oil from the internal high pressure system. The rod protruding from the hydraulic cartridge hand pumps may feel damp with oil after use.