This angel check valve is a one-way valve is installed on the oil suction and refueling pipeline at the top of thefuel tank to ensure that the oil does not fall back. When installed in a strong vibration area, the spring-loadedmain valve and the bottom valve with sealing nitrile rubber assist in closing the main valve to ensure that the odoes not fall back.
The one-way valve is one of the accessories that must be used to prevent the back flow of the liquid in thesuction line when the fuel dispenser is stopped.

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