Introduction to hydraulic system filters（2）

There are four kinds of coarse filter, ordinary filter, precision filter and special fine filter, which can filter out more than 100μm, 10 ~ 100μm, 5, respectively, according to their filtering accuracy (filter impurity particle size) To 10 m and an impurity of 1 to 5 m in size.
When using the oil filter, consider the following points:
(1) Filtration accuracy should meet the requirements.
(2) in a long time to maintain adequate flow capacity.
(3) filter has sufficient strength, not the role of hydraulic damage.
(4) filter corrosion resistance, and can work at the specified temperature lasting.
(5) filter cleaning or replacement is simple.
Therefore, the oil filter should be based on the technical requirements of the hydraulic system, according to filtration accuracy, flow capacity, working pressure, oil viscosity, temperature and other conditions selected its model.
2. Install the oil filter in the hydraulic system is usually installed in the following locations:
(1) to be installed in the pump suction port:
Pump oil suction road are generally installed on the surface type oil filter, the purpose is to filter out the larger impurities to protect the hydraulic pump particles, in addition to the filter oil filter capacity should be more than twice the pump flow rate, pressure loss is less than 0.02MPa.
(2) installed in the export of oil on the pump:
The purpose of installing the oil filter here is to filter out contaminants that may enter the valve and other components. The filtering accuracy should be 10 ~ 15μm, and can withstand the working pressure on the oil pressure and impact pressure, pressure drop should be less than 0.35MPa. At the same time should be installed
Safety valve to prevent oil filter blockage.
(3) installed in the system to the oil return: This installation from the indirect filtering effect. General and the filter and even installed a back pressure valve, when the filter plug to a certain pressure value, the back pressure valve open.
(4) installed in the system branch of the oil.
(5) separate filter system: a large hydraulic system can be set up a separate hydraulic pump and oil filter filter circuit.
In addition to the hydraulic system in the oil filter system, but also often in some important components (such as servo valves, precision throttle valve, etc.) in front of a separate installation of a dedicated precision oil filter to ensure their normal work.