Material selection: different materials determine different pressure levels. First of all, reasonable material selection should be made according to the use pressure. Generally speaking, the following principles should be followed: when the working pressure P < 6.3MPa, cast iron HT20-40 can be used for hydraulic valve block.

The hydraulic valve block is a small circuit in the process of operation. In the process of use, all kinds of used valves are connected together through the oil holes on the valve block. For example, we now use a balance valve block, which contains balance valve, pressure reducing valve, one-way valve, directional valve and shuttle valve.

The surface roughness of the valve and flange installed on the hydraulic valve block shall reach Ra0.4, and the surface roughness of the sealing surface of the end pipe joint shall reach ra3.2. In addition, the tolerance of perpendicularity between the screw hole of pipe joint and its outer joint surface shall be at least Grade 8.

Deburring and cleaning: in order to ensure the cleanliness of the hydraulic system, the valve block must be deburred. At present, many manufacturers still use brush for manual deburring, but also use methane blasting method for deburring.