Hydraulic valve block H

Manufacture of hydraulic valve block:

1. 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.

2. All the screw holes on the valve block shall have machining accuracy requirements, generally 7h. The machining accuracy of the mounting hole of the threaded Manifold shall meet the requirements of the product sample. The roughness of the mounting hole of the Manifold is Ra0.8. In addition, there are also dimensional tolerance and geometric tolerance requirements. The surface roughness of 0-ring groove is ra3.2, and that of general runner is Ra12.5.

3. The high pressure valve block shall be made of 35 forged steel as far as possible, and the general valve block shall be made of A3 steel or ductile iron. When cutting the valve block material from the plate by gas cutting, sufficient machining allowance shall be left, and the blank of the valve block shall be forged before processing. The material for processing valve block shall be compact in internal structure, free from interlayer, trachoma and other defects, and the blank shall be detected if necessary. Cast iron blocks and larger steel blocks should be aged and pretreated before processing.