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What are the methods to control hydraulic oil pollution?
Author : admin Time : 20-02-14 AllPageView : 598

1) Set the target cleanliness level

Manufacturing gaps in hydraulic components can be divided into two basic ranges, namely a minimum of 5 μm for high-pressure components and a maximum of 25 μm for lower pressure components. The actual working gap of a component is determined by the type of component and the conditions of the working process it undergoes. These gaps help determine the required fluid cleanliness of the component. According to the engineering data and field experience, you can refer to the relevant design manuals and select the recommended pollution level for the pump, motor, directional valve, pressure control valve, and flow control valve.

The hydraulic system should clearly indicate the target cleanliness level in its engineering documents. Various factors affecting the system should be considered including oil, operating temperature and starting temperature, temporary load rate, service life of the components required by the system, and safety issues. To set this goal. Because the actual cleanliness level of the oil varies with the sampling point (ie, tank, pressure pipe, return pipe, etc.) in the system, unless otherwise stated, the target cleanliness level is assumed to be for the return pipe and the return pipe upstream of the filter And set.

2) Shut off well

The most critical time for the life of the hydraulic system or lubrication system is the initial running-in period. During this time, the components produced many debris and were mixed with debris during the assembly process, being washed by the oil through the system. While the system is running at no load, this contaminant is quickly captured and removed from the system. The rinsing process has three steps. First, the pollutants are driven out of the den and transported to the filter; second, the machine is operated to allow the oil to flow through all the pipes and components; third, the high-efficiency filter is used to capture the pollution. Driving out and transporting contaminants is best accomplished by using low viscosity fluids that flow at high speeds. Special flushing fluids can be used or system hydraulic fluids can be used at high temperatures. In order to flow through all lines, all valves should be operated several times. In some cases, the element connection line must be bypassed in order to allow a large flow of oil to flow through the line. The debris is captured fairly quickly and the system is flushed to the required degree of contamination. The target cleanliness level for washing should be two ISO codes lower than the target cleanliness level for system operation. When new oil is introduced into a properly flushed system, it will take less time to reach system equilibrium.


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