How to tell whether the vacuum oil filter is second-hand?

During the oil filtering process of the vacuum oil filter, when the water content of the turbine oil is too high, a large amount of oil foam will be generated in the vacuum tank. At this time, open the check valve, reduce the vacuum, and lower the oil level in the observation hole below the oil volume during normal operation. 

When the vacuum operation can be adjusted, it should be noted that the oil level in the vacuum tank is lower than the middle hole. The operating temperature of the vacuum pump shall not exceed 75 degrees, and the motor temperature shall not exceed 60 degrees. Observe the fine filter on the pressure gauge. If the gauge pressure is 0.4MPa, it is necessary to stop cleaning the filter.

The surrounding filter material has many holes in the plastic or metal cylindrical frame and is wrapped in one or two layers of copper wire mesh. The filter depends on the accuracy of the copper mesh layer and the size of the mesh. The vacuum oil filter has a simple structure,a large flow rate, and is easy to clean, but the filtration accuracy is low. It is generally used for the suction port of the hydraulic pump. Clean oil filter.

So how to identify its new and old? 

First of all, we can identify it based on the appearance inspection of the oil filter, and judge by observing the paint and appearance of the equipment. The refurbished machine is generally repainted, so the color is relatively dark in appearance. 

Secondly, it can be identified by electrical testing to see if the circuit inside has been replaced or modified. Of course, we can also identify it through the filter. Generally speaking, the vacuum oil filter system is related to the cleanliness of the oil. Once you buy a second-hand oil filter chip, the problem is big. 

Therefore, we can check whether the chip is brand new based on the disassembly of each relevant part. The blade manufacturer found that we can identify the oil pump of the oil filter, and we can judge whether it is normal by listening to the sound of the oil pump.