When air enters the system air and enters the low-pressure pipeline, cavitation will occur, making the oil discontinuous and affecting normal operation. When the air enters the high pressure pipeline, it is compressed rapidly under the impact of pressure oil, causing the hydraulic system to generate noise; and when the gas is suddenly compressed, it will emit a large amount of heat, causing local overheating, accelerating the temperature rise of the hydraulic fluid, and damaging the hydraulic components or oil. The liquid quickly deteriorates, which reduces the service life of the oil. In addition, due to the large air compressibility, the oil is discontinuous, the hydraulic system is unstable, the fuel tank is slowly lifted, or the vibrations occur during the lift, and even the implements cannot be raised. The main measures to prevent air from entering the hydraulic system are the following: 1. Except for the vent pipe, both the suction pipe and the return pipe should be inserted below the oil level and keep enough concentration to avoid air entering when the system stops working. 2. Always maintain the height of the oil level in the tank to ensure that the oil pump suction pipe is completely intruded into the oil. Each part of the system should also maintain the fullness of the oil. In the oil pump, a one-way valve can be installed at the outlet of the oil pump and a back pressure valve can be installed on the return oil line. 3. Keep a good seal of the fitting, especially the suction line. If the seal is not good and the oil pressure is lower than atmospheric pressure, the air will enter the hydraulic system from the defective seal. 4. The strainer or filter at the fuel tank outlet should be kept clean and cannot be blocked. Otherwise, under the effect of the oil suction of the oil pump, vacuum will be formed in the filter and the pipeline, so that a large amount of air is sucked from the filter and the pipe joint. 5. Before the hydraulic system works or after changing the oil, exhaust should be performed. Great Northern Wildlife Network
Return oil filters
Describe:
The return oil filters are located on the return pipeline of the system, the function is to capture the contaminants produced or intruded in the system before returning to the tank. So it's the most effective and important filter for controlling the concentration of pollution in the system.
The return oil filter is mainly installed on the return pipe road of the hydraulic system. Various kinds of dirt such as abrasive particles produced by various hydraulic components in the working process can be intercepted by setting the oil filter of the return oil pipeline to avoid returning to the fuel tank again. Inhaled again by a hydraulic pump. The allowable pressure difference of the oil filter in the return pipeline is 0.3 ~ 0.5mpa. according to the different pressure level. The accuracy is determined according to the requirement of oil contamination.
Characteristics:
The material of the filter elements are the chemical fiber, filter paper, wire mesh and line-gap types. The chemical fiber filter is more effective than paper filter, and the precision is high. It is difficult to clean the chemical fiber filter and paper filter element after blocking, so it is necessary to replace the filter element. The return oil filter is equipped with a differential pressure signaling device. When the pressure difference between the inlet and outlet of the filter due to the clogging of the filter element is up to 0.35mpa, the switch signal should be issued, and the filter element should be cleaned or replaced at this time. The filter core adopts a new type of
chemical fiber Filter Material, which has the advantages of high filtration accuracy, large oil flow capacity, low original pressure loss, large amount of sewage absorption and so on. The filter accuracy is calibrated with absolute filtration accuracy. The filtration ratio 3, 5, 10, 20 > 100, the filtration efficiency ≥ 99 ~ (99), is in accordance with the ISO standard.
The return oil filters types:
XNL series box return filter
QYL series oil return filter
YLH series oil return filter
RF series direct return oil filter
RFA series micro direct return oil return filter
HU series oil return filter
SZU-A, SQU-A, SWA-A and SXU-A series: double cylinder oil return filter
SRLF series: double cylinder return pipeline filter
SRFB series: double cylinder straight return oil return filter
SRFA series: double cylinder micro straight return oil return filter
SDRLF series large flow double cylinder oil return filter Filter
LXZS series: self-sealing magnetic oil filter
RFB series : direct self-sealing magnetic return filter
CHL series: self-sealing magnetic return filter
GP wy series: magnetic return filter
Metal Filters,Rutern Filters,Stainless Steel Sintered Fiber Meduim,Rutern Oil Filters Henan Sinofiltec Technology Co.,Ltd , https://www.airfilters.pl
