Marine diesel engine parts introduction diesel engine oil return valve principle is what

Also called relief valve, the function is to maintain a constant pressure in the oil circuit, there are two kinds of installed in the oil pump and the filter, is the hollow screw with spring and ball. It is generally installed on the injection pump and connected with the return pipe. When the diesel oil pressure in the injection pump reaches the opening pressure of the return valve, the diesel oil can flow back to the tank, so as to ensure that the diesel oil pressure in the injection pump is not too high and damage the oil pump and diesel pipe.

The function of the oil return valve of the oil pump is to automatically maintain the fuel pressure of the whole oil pressure system to a certain value, so that the difference between the oil pressure in the oil supply pipe and the pressure in the inlet pipe is a certain constant value (generally 250 ~ 300kPa).

Oil return valve of oil pump:

1. Concept: The oil pressure regulator, referred to as the oil return valve, is the fuel pressure regulating part inside the fuel system, which is controlled by the system oil pressure and the inlet pipe pressure (negative pressure).

2, importance: if there is a problem with the fuel pressure regulator, it will directly affect the accuracy of the injection amount. Fuel pressure is too low, it will cause low idle speed of the vehicle, high speed when there is no fuel for the feeling, serious will cause starting difficulties or even unable to start. In summer, the air conditioning is weak. Fuel pressure is too high, can cause vehicle idle speed is high, accelerate pedal reaction is too sensitive.