What is the principle of the internal return oil structure of a rotary cylinder?

[VanIvan]

The internal return oil structure of a rotary cylinder, also known as the oil pump return valve, functions to automatically maintain the fuel pressure of the entire hydraulic system at a constant value, ensuring that the difference between the oil pressure in the main fuel supply line and the intake manifold pressure remains constant (typically 250–300 kPa). Below is a detailed introduction to the oil pump return valve: 1. Concept: The oil pressure regulator, commonly referred to as the return valve, is the fuel pressure regulation component within the fuel system, controlled by the system oil pressure and the intake manifold pressure (negative pressure). 2. Importance: If the fuel pressure regulator malfunctions, it will directly affect the accuracy of fuel injection. Low fuel pressure can result in low idle speed, a sensation of insufficient fuel supply at high speeds, and in severe cases, difficulty starting or failure to start. In summer, it may also lead to inadequate power for operating the air conditioning. Conversely, excessively high fuel pressure can cause high idle speed and overly sensitive accelerator pedal response.