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To ensure the cleanliness of the hydraulic system, the valve block must be burred. After the burr, pass the endoscope test to ensure that the burr is cleared. Finally, clean the valve block. Remove various particulate contaminants, corrosion, grease, etc. attached to the surface of the valve block. Surface rust prevention treatment. In order to ensure that the valve block will not rust prematurely in use, the rust prevention treatment must be applied. The internal oil channel of the valve block can be phosphate by pickling, and the anti-rust treatment process of the external surface mainly includes blue, cadmium plating, galvanizing, nickel plating and other surface treatment. Pressure retaining test Carry out the pressure retaining test on the valve block according to the design requirements. The safety factor of the valve block is different: the working pressure is less than 16MPa, the test pressure is 1.5 times; the working pressure is less than 25MPa, the test pressure is 1.25 times; the working pressure is less than 31MPa, the test pressure is 1.15 times. The test pressure retention time is 5~10min, and no leakage at each sealing surface and joint.