In fact, the working principle of the oil filter element is not complicated. During the operation of the engine, with the operation of the oil pump, the oil with impurities continuously enters the oil filter from the oil inlet on the base plate assembly of the oil filter, and then passes through the check valve to the outside of the filter paper for filtering.

Under pressure, the oil continuously passes through the filter paper, leaving a large amount of impurities in the oil on the filter paper, and clean oil enters the central tube. The oil entering the central pipe enters the engine lubrication system from the oil outlet in the middle of the oil filter base plate for lubrication. There are two key components in automobile oil filter - bypass valve and check valve. How do they work?

The working principle of the bypass valve:
Normally, the bypass valve is in a closed state, but in special circumstances, the bypass valve will open to ensure the normal supply of oil inside the engine.

Under what conditions will the bypass valve open:
1. When the car oil filter exceeds the replacement cycle and the filter element is seriously blocked.
2. When the oil is very viscous (cold start, external low temperature).

Although the oil flowing through the engine at this time is not filtered, the damage caused by not lubricating the engine with oil is much lighter. The oil filter bypass valve adopts Baosteel Q/BQB series standard metal plates, which can ensure stability and effectiveness when opening/closing under precise size calculation, prevent more serious dry wear caused by clogged filter elements or high oil viscosity when the engine does not have lubricating oil supply, and thus protect the engine.

The working principle of the check valve:
When the vehicle stops running, the oil inlet check valve is closed to ensure that the oil in the vehicle oil filter and subsequent lubrication system is not drained, and to ensure that the required oil pressure is established as soon as possible when the engine is restarted to avoid dry friction.