Oil return filter

Oil return filter

It is located in the return line of the system and is used to capture contaminants generated or intruded in the system before returning to the tank. It is therefore the most effective and important filter for controlling system contamination concentrations.

Product introduction

The oil return filter is mainly installed on the oil return line of the hydraulic system. Various kinds of dirt such as abrasive grains generated by various hydraulic components during the working process can be intercepted by setting the oil filter of the return oil line to avoid returning to the fuel tank again. It is again sucked by the hydraulic pump. The allowable pressure difference of the oil filter in the return line is in the range of 0.3 to 0.5 MPa depending on the pressure level. The accuracy is determined according to the requirements of the degree of oil contamination.
There are more factors to be considered in the setting of the return filter. One of the important factors is the hydraulic shock. Especially in the case of hydraulic cylinders and proportional valves upstream, the commutation of the hydraulic cylinder and the sudden drop of the proportional valve under high pressure. Electricity, there will be a large instantaneous flow impact, which will cause great damage to the filter element of the oil filter. When designing the oil filter for the return line, it must be fully recognized and strengthened in structure.

Performance feature editing

The oil return filter is divided into four types: paper type, mesh type and line gap type. The chemical fiber type has better filtering effect than the paper type, and the precision is high. It is difficult to clean the chemical fiber type and the paper type filter element after clogging, so the filter element must be replaced. The oil return filter is equipped with a differential pressure signaling device. When the filter element is caused by contamination and the pressure difference between the inlet and outlet ports is 0.35 MPa, a switching signal is issued, and the filter element should be cleaned or replaced at this time. The filter element adopts a new chemical fiber filter material, which has the advantages of high filtration precision, large oil passage capacity, low original pressure loss, large amount of dirt absorption, etc. The filtration precision is calibrated with absolute filtration precision, and the filtration ratio is p3, 5, 10, 20 >100, filtration efficiency n≥99%, in line with ISO standards.

Application scope editing

1. Metallurgy: used for filtration of hydraulic systems of rolling mills and continuous casting machines and filtration of various lubrication equipment.
2. Petrochemical: Separation and recovery of products and intermediate products in refining and chemical production processes, and oilfield injection of well water and natural gas in addition to particle filtration.
3. Textile: Purification and uniform filtration of polyester melt in the drawing process, protection and filtration of air compressor, degreasing and dehydration of compressed gas.
4, electronics and pharmaceuticals: reverse osmosis water, deionized water pretreatment filtration, washing liquid and glucose pretreatment filtration.
5, thermal power and nuclear power: gas turbine, boiler lubrication system, speed control system, bypass control system oil purification, feed water pump, fan and dust removal system purification.
6, mechanical processing equipment: paper machinery, mining machinery, injection molding machines and large-scale precision machinery lubrication system and compressed air purification, tobacco processing equipment and spraying equipment filtration.