Kim Ho used excavators, used Hitachi excavators for sale, Beijing used Hitachi excavator provided by Shanghai Jin Hao Used Construction Machinery Co., Ltd .. Shanghai Jin Hao Used Construction Machinery Co., Ltd. (www.jinhaosh.cn) is a professional, "Komatsu excavators, Used Hitachi excavator, used Caterpillar excavators, Used Kobelco Mining" company. Since its inception, we adhere to the "honesty, sound management" approach, the courage to participate in healthy competition in the market, so that the "Shanghai Jin Hao" brand has a good reputation. We adhere to the "service first, customers first" principle, so Kim Ho Excavators digging machinery to win the trust of customers congregation, establish a good corporate image. Special Note: This information is for reference pictures and information, please contact us to obtain the most accurate information, thank you! Excavators economic development is one of the main means of production, is the inevitable outcome of economic development. Excavators used as a model for the conservation of resources to support the development of nation-building! China's second-hand excavator industry, in the late nineties has been the rapid development. Both for the country save a lot of natural and human resources, but also for national economic development has played an indelible role. The main source of domestic Excavators are: import equipment from abroad, domestic joint assembly, domestic excavator naturally use other ways. Excavators price is mainly based on market price fluctuations by mechanical couplers time buyers and sellers, a free consultation. Excavators why orifice blockage affects so big? This is a common fault, but also a great influence on the hydraulic system failure. To clarify the truth, the principle should be introduced on a pilot-operated relief valve. P pressure oil through existing orifices used Hitachi excavator sale, enter C chamber used Hitachi excavators for sale, then the pressure chamber is equal to the system's C P pressure. Because of a small spring action, the piston has been pressed to the right seat. When the oil pressure chamber C up to a certain value. That is up to the individual cone valve regulator value of used Hitachi excavators, cone valve open, the oil chamber C through the cone valve back to the tank. In this case, C chamber pressure plummeted, due to the damping effect of orifice, C chamber and system pressure loss of balance, so the small piston back to the left, the system pressure through a small piston overflow tank. When the system pressure falls below a certain value, the cone valve is reset, followed by a small piston has the right to reset. So repeatedly performed to adjust the system pressure. If the small piston in the middle of the damping holes are blocked, lack of oil pressure, C chamber pressure chamber C is much lower than the system pressure, so the smaller piston has been in the left position. System pressure regardless of level, are also in the overflow state. So when the tiny orifice once blocked, the impact will be great.