Purification is widely used in petroleum, chemical, metallurgy, electric power, aviation, electronics, pharmaceutical, environmental protection, nuclear energy, nuclear industry, natural gas, refractory material, fire equipment and other fields.

According to the installation position in the hydraulic system, hydraulic oil filter element into the suction line filter, pressure filter and oil return line filter.

The suction line filter: oil pipeline (oil tank -- hydraulic pump inlet) or directly in the tank mounted oil filter is a necessary measure to protect the hydraulic pump, its accuracy is generally 100 ~ 180 μ m, depending on the pump self-priming ability were determined, the flow resistance is too large resulting in cavitation in hydraulic pump.

Pressure: pressure pipeline pipeline filter oil filter, is not only to protect the downstream element, as the main oil system oil contamination degree of the filter, through its own on the oil's high efficient purification, also play a very good protective effect on the hydraulic pump, filtering accuracy of 5 - 10 μ m, the large pressure filter also very interested, vibration, pressure oil filter differential pressure pipeline license, according to the different level of pressure, in the range of 0.3 ~ 0.7MPa. As a ground equipment for pressure pipeline oil filter, considering the cost, the installation space, can be large then the big.

Oil return line filter: all kinds of elements generated in the working process of the abrasive, all kinds of dirt can set the oil return line filter and be intercepted, avoid returning to the oil tank, again by the hydraulic pump suction. The oil return pipeline oil filter differential pressure of the license, according to the different pressure levels, range from 0.3 to 0.5MPa. Precision according to the oil pollution degree requirements to determine the specific. Need more oil return pipeline oil filter setting the factors to consider, one important factor is the hydraulic impact, especially the upper hydraulic cylinder and proportional valve case, suddenly fell under high pressure hydraulic reversing and the ratio of cylinder valve electric, will produce instant flow impact, will cause great damage to the filter, oil filter, in the design and selection of oil return pipeline oil filter should have a full understanding, to strengthen the structure.