Design requirements for block valve hydraulic
1. High reliability, ensure that the oil between the orifices does not run off;
2. Compact structure, taking up little space;
3. Simple oil circuit, small pressure loss;
4. Easy processing, less auxiliary process holes;
5. Convenient for piping;
6. Easy to adjust and operate the control valves.
Design step for block valve hydraulic
1. Based on the valve block’s system layout and piping layout, make a preliminary determination of the relative position of each external oil port on the valve block. Additionally, determine the connector specifications according to the flow rate. This approach will ensure proper alignment and functionality.
2. initially determine the installation position of each control valve on the valve block according to the working principle of the valve block, the system layout, the characteristics of each valve itself and the maintenance performance;
3. design and repeatedly optimise the flow paths between the external ports and the valve parts, so that the flow paths achieve correct and reasonable communication according to the designed principle.
Design points of block valve hydraulic
1. When designing the valve block, consider the system pipeline and account for the spanner operating space. For oil ports that are close to each other and prone to incorrect connections, design or select different pipe joints and hoses with varying diameters to facilitate differentiation.
2. The valve block’s oil port should be marked next to the oil port designation (for example: P, A, T, B, A1, A2, B1, B2, M1, M2). Specifically, the oil port markings on the valve mounting surface are only represented in the drawings. Additionally, these markings are crucial for connecting with the hose (or steel) pipe external oil port and the pressure port next to the body of the valve. Therefore, the corresponding steel mark must be clearly displayed to ensure proper installation. Furthermore, to avoid covering the markings after the pipe connector (or flange) installation, the distance between the steel mark and the edge of the corresponding port should be more than 7mm, as can be specified in the technical requirements.
3. Design the external oil port and pressure port on the valve block according to the connection size of the pipe joint. Leave suitable allowances for the outside diameter and depth of the countersunk hole, as well as the depth of the thread, to avoid interference during installation.
4. Choose a reasonable structure for the control valve form and avoid excessive integration of the valve block. In particular, avoid integrating too many threaded cartridge valves into the same valve block. Doing so will double the process holes, create zigzagging oil circuits, and increase pressure loss, while also complicating processing, inspection, and troubleshooting. However, integrate the plate valve for relevant functions and parallel oil circuits as much as possible to simplify the system piping.
5. The mounting surface of the plate-type hydraulic control valve on the valve block should be designed according to the dimensions provided by the manufacturer’s samples. Additionally, you can refer to the quality of its surface processing based on the standard ‘ISO 4401 Hydraulic Fluid Power – Four-Port Directional Control Valves – Mounting Surfaces’ or ‘GB/T 2514 Hydraulic Transmission Four-Port Directional Control Valves Mounting Surfaces.’ These standards offer relevant provisions for ensuring proper surface quality.
6. Design the threaded cartridge valve mounting holes on the block according to the dimensions provided by the manufacturer’s samples. Additionally, try to use models from other brands that have strong generality and existing machining tool inserts. This approach will help ensure compatibility and ease of machining.
7. Design the valve block body orifice to minimize flow resistance loss and simplify processing as much as possible. General working pipeline recommended flow rate of 8m/s, return pipeline recommended flow rate of 4m/s. 8.
8. Calculate the value of the hole depth of the valve block from the view surface where the hole is located. Include the drill tip in the calculation.
9. To facilitate deburring and avoid pollutant deposition, design the intersecting holes with a T-shaped structure. Specifically, ensure that one of the holes extends from the hole end face to the axis of the channel. This design choice will help prevent complications and maintain efficient processing. On the other hand, avoid using a cross-shaped structure, as it may complicate the process.
10. Avoid using inclined orifices. If you must use inclined orifices, ensure that their angle of inclination does not exceed 35°. Also, make sure to seal the orifices well.
11 In order to prevent the system from being punctured, the minimum wall thickness between two adjacent (intersecting or parallel) orifices in the middle of the valve block (including mounting threaded holes) should be not less than 4mm, but in the case of layout and structural constraints, and the pressure of the orifices is less than 6.3MPa, the minimum wall thickness between the orifices may not be less than 3mm.
12. Considering that the oil holes on the integrated valve block are thin and long, they may become misshapen during drilling. Increase the actual wall thickness appropriately based on the calculation.
13. In order to avoid damage to the drill bit, the depth of the hole should not exceed 25 times the diameter of the hole.
14. Seal the process holes with screw plugs, flanges, and other removable means to facilitate cleaning, washing, and inspection of the holes. In the position does not allow, the diameter of the hole is not more than 12mm, allowing the use of ball up type plug blocking, ball up type plug installation size should be in line with the ‘JB/T 9157-1999 hydraulic and pneumatic use of ball up type plug installation dimensions’ provisions.
15. It is recommended that the block’s process orifice plug does not protrude from the surface of the mounting surface.
16. The surface of the valve block is nickel-plated, and the thickness of the nickel-plated layer is 0.008-0.015mm. 17.
17. For complex valve blocks, sectional views may not clearly show the intersection condition of internal holes. Therefore, indicate the intersection condition of each hole in the hole system table. Doing so will facilitate the inspection of the valve block. At the same time, attach the working principle diagram and three-dimensional axonometric drawing of the valve block to the engineering drawings.
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