Filtering element of the “spin-on” type filter is put inside metal can type housing.

Thanks to such construction the housing of filter is steady to the mechanical damages. It is also not difficult to replace used filters.

1. Anti-drain back valve.

The anti-drain back valve is made of oil-resistant rubber and looks like membrane. It serves for prevention of oil outlet from filter back to oil pump after the engine stops.

At the expenses of it the dry friction between moving elements is eliminated, because filter is always filled in with oil and oil reaches moving parts quickly. Anti-drain back valve is very important when filter is screwed into the engine on top or from the side. If filter works in “cover up” position, then the function of the valve is successfully taken by the gravity.

2. By-pass valve.

The by-pass valve is always installed in oil systems. Usually it is build-in to filter, sometimes it is placed into the engine body. Regardless of the place of this valve installation, its only task is to pass oil to lubrication system if the oil cannot go thought filtering element. There could be two reasons causing such situation: excessively contaminated filtering partition or too high viscosity of oil (for example during “winter start”). Depending on the place of by-pass valves installation there are two types applied in oil filters. First type is placed under cover and is called “top”. Second valve is “bottom” and is fixed to the bottom of filter cartridge.

3. ECO valve (“anti-siphon valve”).

ECO valve prevents oil drain from filter to engine. Application of oil filter with both anti-drain back valve and ECO valve allows noticeably reduce time of dry friction between moving elements of the engine. Moreover ECO valve efficiently prevents oil outlet during replacement. Hence protect environment.