According to the different filtration accuracy (the size of the particles that filter out impurities), the hydraulic filter oil filter has four types: coarse filter, ordinary filter, precision filter and special fine filter, which can filter out more than 100μm, 10～100μm respectively. , 5 ~ 10μm and 1 ~ 5μm size impurities.
When choosing a Hydraulic filter element oil filter, consider the following points:
(1) The filtering accuracy should meet the predetermined requirements.
(2) It can maintain sufficient circulation capacity for a long time.
(3) The filter core has sufficient strength and will not be damaged by the action of hydraulic pressure.
(4) The filter core has good corrosion resistance and can work for a long time at the specified temperature.
(5) The filter core is easy to clean or replace.
There are usually the following positions for installing hydraulic filter element oil filter in a hydraulic system:
(1) It should be installed at the suction port of the pump：
Generally, a surface oil filter is installed on the suction road of the pump to filter out large impurity particles to protect the hydraulic pump. In addition, the filtering capacity of the oil filter should be more than twice the flow rate of the pump, and the pressure loss should be less than 0.02MPa.
(2)Installed on the outlet oil road of the pump:
The purpose of installing the oil filter here is to filter out the contaminants that may invade the valve and other components. Its filtration precision should be 10 ~ 15μm, and it can withstand the working pressure and impact pressure on the oil circuit, and the pressure drop should be less than 0.35MPa. At the same time, a safety valve should be installed to prevent the oil filter from being blocked.
(3)Installed on the oil return road of the system: This installation acts as an indirect filter. Generally, a back pressure valve is installed in parallel with the filter. When the filter is blocked and reaches a certain pressure value, the back pressure valve opens.
(4)Installed on the branch oil circuit of the system.
(5) Separate filtration system: A hydraulic pump and an oil filter can be specially set up for a large hydraulic system to form an independent filtration circuit.
In addition to the oil filter required for the entire system in the hydraulic system, a special oil filter is often installed separately in front of some important components (such as servo valves, precision throttle valves, etc.) to ensure their normal operation.
Post time: Nov-10-2022
