Constant Pressure Delivery Valve 090140-2590 Diesel Engine Fuel Pump Equal Pressure Delivery Valve Assembly

1. Isolate the plunger cavity and the high-pressure oil pipe: When the diesel engine is not supplied with fuel, the delivery valve can isolate the plunger cavity and the high-pressure oil pipe from each other to prevent the plunger from sucking the fuel in the high-pressure oil pipe back to the oil pump cavity when it is moving downward. This is an important prerequisite for ensuring the normal operation of the engine fuel system.

2. Control the residual pressure in the high-pressure oil pipe: The delivery valve can also control the high-pressure oil pipe to maintain a certain residual pressure. The advantage of this is that the fuel pressure in the high-pressure oil pipe can be quickly increased during the next injection, shortening the time difference between fuel supply and injection, making the fuel supply more agile.

3. Rapidly reduce the oil pressure: When the fuel injection pump finishes supplying fuel, the delivery valve can quickly reduce the oil pressure in the high-pressure oil pipe. The purpose of this is to ensure that the oil is cut off cleanly, avoid oil dripping from the injector, and improve the working efficiency of the engine.

In specific operation, the delivery valve controls the oil flow in the pipeline to achieve the purpose of controlling the diesel engine's fuel supply. When the engine needs fuel, the delivery valve will adjust its opening degree according to the engine's load and speed to match the fuel pressure and flow with the engine's needs. When the engine does not need fuel, the delivery valve will close quickly to prevent fuel backflow and maintain the stability of the system.

In short, the delivery valve is an indispensable and important component in the diesel engine fuel system. It ensures the stable operation of the engine and improves the working efficiency and reliability of the engine by accurately controlling the flow and pressure of the fuel.