The function of the rubber flap check valve is that when the oil filter is set above the engine, after the engine is turned off, it can effectively prevent the oil loss in the oil filter, so as to avoid short-term low oil pressure when restarting, causing engine wear. The reason why some models of filter do not have a rubber flap check valve is that the matching main engine oil filter is installed at the bottom, so even if the engine is turned off, the oil in the oil filter will not be lost. At this moment, the check valve will disappear.
How to determine the installation position of the rubber flap check valve? What is the difference between the front installation of the pump and the installation of the rubber flap check valve after the pump, and where does the installation before the pump apply?
Check valve, also called rubber flap check valve, is an automatic valve. It relies on the pressure of the flowing medium in the pipeline to push the valve flap to close and open the valve. When the medium stops flowing, the rubber flap check valve flap closes. It can effectively prevent the medium in the pipeline from flowing back, which plays a role in ensuring the safety of the pipeline. Great effect.
The rubber flap check valve must be installed at the outlet of the pump and before the outlet control valve in order to check the check valve. Generally, the first outlet of the pump is the soft connection (shock absorber), the next is the check valve, and then the isolation valve (such as butterfly valve, gate valve, stop valve, etc.)