The Importance of Hydraulic Valve Block

The hydraulic valve block (referred hydraulic manifold block) is a crucial component of a hydraulic system, ensuring the system’s optimal functionality. Research on the rational design and manufacturing of hydraulic valve blocks has identified several key areas of focus, including:

1. Improve the operating efficiency of equipment
2. Achieve the standardization and integration of hydraulic systems, 
3. Reduce expenditure on raw materials
4. Save industrial costs
5. Enhance precision and accuracy

The objective of this article is to ensure the quality standard of hydraulic valve blocks, simplify the manufacturing process, reduce costs, and provide guidance on maintaining quality throughout the three phases of design, manufacturing, and testing. By doing so, we aim to make the optimal performance and reliability of the hydraulic system.

Design of Hydraulic Block

The design of hydraulic valve blocks often contains some unreasonable factors, which in turn affect the quality of the hydraulic valve blocks. This article first analyzes the causes of the unreasonable design of hydraulic valve blocks, comprehensively grasps the design and manufacturing process of hydraulic valve blocks, and thereby effectively controls the overall rationality of hydraulic valve blocks.

The causes of unreasonable design ：

1. The arrangement of the pores does not comply with the principles of fluid transmission.
2. The design includes too many angled holes, making machining difficult.
3. The hydraulic valve block involves too much integration, leading to difficulties in machining.
4. The design of the hydraulic valve block is considered in isolation, without regard to the process requirements of the matching components.
5. The design of the hydraulic valve block is not conducive to maintenance, which affects the overall service life of the product.
6. The space of the valve block is not fully utilized, resulting in material waste.

During the design process of hydraulic valve blocks, try to minimize the occurrence of angled holes and deep holes. In the design stage of the hydraulic block diagram pay attention to the direction and position of the oil inlet and outlet, and fully consider the convenience of use to enhance practicality.

Several requirements to avoid bad valve block:

1. The arrangement of the pores in the hydraulic valve block should conform to the principles of fluid transmission. Based on actual conditions, the number of integrated valves should be reasonably determined.
2. Deep holes and angled holes should be minimized in the design of the valve block to ensure that the oil paths within the hydraulic valve block are simple and clear, and the reliability of fluid transmission is high.
3. According to the predetermined design requirements, attention should be paid to the direction of the oil inlet and outlet, as well as their location.
4. When designing the hydraulic valve block, the installation requirements of the components within the valve block should be considered.
5. Components within the valve block should be regularly inspected, and their placement should facilitate easy maintenance.
6. The valve components should be compact but without interference.

To address the issues appearing in the design process of hydraulic valve blocks, in order to control the quality of the valve blocks, it is necessary to adopt certain control methods and measures. Only by fully understanding the potentially unreasonable design factors that may arise during the design process of hydraulic valve blocks, and by preparing for quality control, can subsequent work be carried out smoothly. Additionally, for heavier valve blocks, lifting threaded holes should be designed to facilitate lifting and installation.

Manufacturing of hydraulic block

Once the overall design plan for the hydraulic valve block has been finalized, the manufacturing process begins.

 Six stages of the manufacturing process 

1. Material selection: Choose materials based on design requirements, such as aluminum alloy, stainless steel, or cast iron.
2. Preprocessing: Use a lathe or milling machine to roughly machine the material into the basic shape of the valve block.
3. Machining: Use precision machine tools to finely machine the valve block, ensuring that all dimensions and tolerances meet the design requirements. This includes processes such as drilling, tapping, milling, and grinding.
4. Deburring: Thoroughly remove burrs from the valve block surface and intersections of flow paths, using machines such as a drill press, milling machine, or deburring machine.
5. Cleaning: Use a steam cleaner, high-pressure water gun, high-pressure air stream, or ultrasonic cleaning machine to clean the surface of oil stains, rust, dust, etc.
6. Surface treatment: Apply surface treatments to the valve block, such as sandblasting, anodizing, or plating, to improve corrosion resistance and wear resistance.

Common Problems and Solutions in Manufacturing Process

Throughout the manufacturing process, the following issues often arise and must be closely monitored to ensure the quality of the hydraulic valve blocks:

Valve Block Deformation

Reasons: During the manufacturing process of hydraulic valve blocks, deformation of the valve block may occur, typically due to material distortion, mainly caused by improper heat treatment. When the cutting tool comes into contact with the valve block, it can easily lead to deformation of the hydraulic valve block. 

Solution: To ensure the quality of the manufacturing process, appropriate control measures, and methods must be adopted: reasonably estimate the heat processing technique, ensure sufficient machining allowance, select the appropriate cutting tools, and avoid contact deformation operations.

Surface Damage

It is common to encounter issues such as surface damage. This type of damage can affect the proper functioning of the entire hydraulic system, leading to problems such as oil leakage.

Reasons:

1. There may be some debris, chips, and other foreign objects that get carried along with the cutting tool into the hydraulic valve block, causing severe surface damage.
2. The cutting tool is not appropriate, and the blade becomes dull after a period of machining, resulting in errors during the shearing process.
3. The operator’s operational error of equipment is the main cause of surface damage.
4. During the later stages of assembly, packaging, and cleaning of hydraulic valve blocks, it is inevitable that collisions may occur, causing surface damage.

Solutions：

1.  It is essential to replace old and dull cutting tools in a timely manner to ensure the rigidity of the material being processed and its good performance. 
2. At the same time, it is necessary to provide strict technical training to the process operators to guarantee a reduction in work errors. 
3. During the cleaning and assembly processes of hydraulic valve blocks, collisions must be avoided to ensure the accuracy and stability of the components.

Pore Damages

In general, damage to the pores can lead to a decline in the valve block’s directional control performance, resulting in oil leakage and affecting the stable operation of the hydraulic system. The size of the pores must be controlled strictly to prevent wear on the valve.

Reasons:

1. The machining tool’s poor cutting performance results in damage to the pores. 
2. During the hot working process, the block deforms. 
3. In the installation process of other components, operations such as drilling and leading holes may still encounter unreasonable construction and inadequate implementation of processing procedures, leading to damage to the pores.

Solutions:

1. Examine and exchange of new tools to ensure tool quality
2. Provide technical training to the personnel, strictly follow the procedures and process for operation, and ensure the quality of the hydraulic valve block.

Testing Stage of Hydraulic Valve Block

After the construction of the hydraulic valve block is completed, its performance must be debugged. The debugging process is mainly divided into two parts: pressure resistance test and function test. 

Pressure Resistance Test

Table 1 is the pressure comparison table selected for the pressure resistance test, which shows that to ensure that the components are not damaged, the test pressure should not exceed 31.5 MPa.

During the pressure resistance test, there may be leakage phenomena. It is important to analyze the causes and solve them promptly to ensure the rationality of the design of the entire hydraulic valve block component. 

Function Test

Each valve in the hydraulic valve block should undergo a function test to ensure that valves such as the overflow valve and the unloading valve can work properly. The speed ratio of the valves should be adjusted to meet the needs of the actual operation. If a fault occurs during the debugging process, a professional is required to analyze the operation based on principles, find the key factors causing the fault, and then solve the fault promptly.

Conclusion：

This article provides a quite detailed analysis of the manufacturing process of hydraulic valve blocks, which have become an essential component in many large industrial equipment. Therefore, ensuring the quality of hydraulic valve blocks is crucial for the proper operation of hydraulic systems. Starting from the design process of hydraulic valve blocks, the article analyzes potential issues that may arise and offers reasonable suggestions for solutions. It then introduces quality control measures during the manufacturing and debugging processes of hydraulic valve blocks to ensure that the entire process takes into account possible quality issues with the valve blocks.

If you want to know any other issues or information about the hydraulic valve blocks that I didn’t mention above, Welcome to contact us by phone or letter to discuss. 

We are a Chinese hydraulic valve block manufacturer, Plz check more details on www.hydraflu.com.