Centrifugal speed governor is carried out in accordance with the spring force and the centrifugal force balanced work, the spring force will always move the lever to the circulating oil lubrication amount increasing direction; and centrifugal force always to cycle fuel racks fuel supply amount reducing direction. When the engine load is reduced engineering machinery manufacturers, speed increases, centrifugal force greater than the spring force of construction machinery moving engines, fuel rod to reduce the amount of oil to the circulation direction, reduce the amount of circulating oil engineering machinery engine brand, speed is reduced the centrifugal force which is less than the spring force, the amount of oil fuel racks ED increases circulation direction, increase the amount of oil circulation speed increased again until the centrifugal force and the spring force balance, fuel rod was unchanged. So basically stable at speed within a small range. Type: Vehicle diesel engine fuel injection pump according to their works can be divided into a plunger-type injection pump, fuel pump - injector and injection pump piston pump rotor distribution pumping principle has cut cylindrical surface of the plunger head chute, and through radial holes, and the top axial bore communicating with the aim of changing the amount of circulating oil; plunger has put into the system, back to the hole, all communication with the low pressure oil pump body cavity, the plunger suit After the pump upper body, use screw positioning. Plunger head chute different location, change the amount of oil by different methods. The oil valve and the oil valve seat is also a pair of precision coupling, paired grinding are not interchangeable, the oil valve is a one-way valve, the spring pressure, the upper conical valve seat surface and tight fit, and its role is When the stop for the upper end of the high pressure tubing and the plunger cavity isolated to prevent the oil from flowing back into the high-pressure tubing inside the fuel pump. Engine manufacturer of construction machinery, engineering machinery engines, Weifang Huadong by Weifang Huadong Engine Co., Ltd. Weifang Huadong Engine Co., Ltd. (www.hdchai.com) strong, credible, in Shandong Weifang engine industry has accumulated a large number of loyal customers. The company better work attitude and constantly improve Weifang Huadong innovative ideas will lead into the brilliant and you work for a better future!