Fuel-water separator is a device for separating water from diesel fuel, it permits water to be drained from the water sump of the fuel water separator without shutting off fuel flow to the fuel water separator filter. A check valve is installed between the water sump and the filter element. When the fuel water separator filter is under vacuum, the check valve can be closed to allow water to drain from the sump. The check valve can close automatically by floating on accumulated water in the sump until the water rises to a level where the check valve is closed. The check valve can also close by opening the drain valve of the fuel water separator filter, which causes a differential pressure between the sump and the vacuum created in the filter element chamber, which forces the check valve to close.
The fuel water separtor filters we produced can widely match different international famous brands as below: