Importance of application of hydraulic valve block

2021-07-03 16:59:09

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 valve block processing shall be compact in internal structure, free of 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.

Precautions for processing and design of hydraulic valve block:

1. In the design of hydraulic valve block, the oil circuit should be as simple as possible, and the deep hole, inclined hole and process hole should be reduced as much as possible. The hole diameter in the valve block should match with the flow rate, especially the through hole must have enough flow area, the direction and position of the oil inlet and outlet should match with the general layout of the system and the connection form of the pipeline, and the process of installation operation should be considered. The components with vertical or horizontal installation requirements must meet the requirements after installation.

2. For the elements that need to be adjusted in the work, the convenience of operation and observation should be considered in the design, such as the relief valve, speed control valve and other adjustable elements should be set at the position where the adjusting handle is easy to operate.

3. Components and key components that need frequent maintenance, such as proportional valve and servo valve, shall be located above or outside the valve block for easy disassembly. In addition, a sufficient number of pressure measuring points should be set in the valve block design for the valve block adjustment. For the valve block with a weight of more than 30kg, the lifting screw hole should be set, but on the premise of meeting the use requirements, the volume of the valve block should be as small as possible.