What is the hydraulic system requirement for the filter
Return pipe pass through filter, its purpose is to system oil tank before, back to filter out the dirt in the system and guarantee of oil in the tank clean. Filtration precision is in commonly 10-50 mu m. in the way of filtering, the filter may be blocked, thus blocking system hydraulic components. With a bypass valve is a suggested alternative oil return filter. The other suddenly under high pressure through oil return will impact, so want to choose the filter. Heavy traffic, if the pressure is too big, should add back pressure valve, filter.
Bypass the filter, the filter is a filter of small pump and filter unit, independently of the hydraulic system, not influenced by system. The main system of variable pump, using this filtering method can make up for the filtering ability under low flow rate is reduced. The bypass filter generally choose their traffic is given priority to flow pump system (Max) 20%, at the same time, the filter precision is higher
Pressure oil filter, its purpose is to protect the pump other hydraulic parts, high pressure due to the installation position, should first consider resistance to high pressure. If used to protect poor ability to resist pollution components (such as servo valves), you need to consider the filtering flow ability, precision and recommend choose shell with high pressure filter, such as domestic ZU - H63X3.
Oil suction filter is used to protect system hydraulic components, from the damage of pollution particles. But it also increases the pump oil absorption resistance, therefore, should choose large flow capacity, high filtration efficiency, large capacity, small pressure loss nurgle. Such as network type and line clearance type filter. Filtration precision and efficiency is a pair of contradiction, the precision of the filter generally choose 80-200 microns, satisfy the need. If it is a plunger pump can even consider not apply filters.
