1. The working face of the test bench shall be kept clean and clean. The flange and the sealing disc of the tested valve shall not be allowed to have its own contaminants. Always check the O-shaped country for damage.

2, the activities of the various parts of the test bench, often refueling, keep the use of clean lubrication.

3, hydraulic oil to regularly check, replace the newly used equipment, so that 3 months to clean the tank, replace the new oil, after every other year to clean and replace once, the oil can not be lower than the lower limit of the oil level meter, The temperature of the oil in the tank must not exceed 55~C.