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how to identify hydraulic fitting size


A hydraulic fitting is a device used to connect pipes, which is used to connect pipes together and transport liquids or gases. When selecting the size of hydraulic fittings, we need to consider many factors, including pipeline diameter, working pressure, flow rate, etc. In addition, we should also consider the special requirements of the usage environment, such as temperature, corrosiveness, and seismic resistance. Choose different types and sizes of hydraulic fittings according to different needs.

Step 1: Confirm the diameter of the pipeline

Before selecting the size of the hydraulic fitting, we need to determine the diameter of the pipeline. Normally, the size of hydraulic fittings should match the diameter of the pipeline. If the size of the hydraulic fitting is too small, it may cause oil leakage at the connection or even lead to pipeline rupture. If the size of the hydraulic fitting is too large, in addition to increasing cost, it may also affect its normal use. Therefore, before selecting the appropriate hydraulic fitting size, it is important and crucial to confirm the diameter of the pipeline.

Step 2: Choose the appropriate work pressure

An important factor we also need to consider is the working pressure of the hydraulic fitting. When selecting the appropriate size for this item, it is necessary to determine the maximum working pressure it needs to withstand in the application scenario. If the working pressure of the hydraulic fitting is insufficient, there is a risk of pipeline damage due to the inability to withstand the high pressure intensity generated in the application. If the working pressure of the hydraulic fitting is too high, it will increase the weight of the connecting part and cause waste.

Step 3: Consider traffic

When selecting the size of hydraulic fittings, in addition to considering working pressure and connection method, flow rate is also a crucial factor. Flow rate refers to the flow rate of liquid or gas in pipelines, which directly affects the efficiency and performance of hydraulic systems.

If the selected hydraulic fitting size is too small, it will cause excessive concentration of liquid or gas in the pipeline, leading to problems such as throat flow. Throat flow refers to the accelerated flow phenomenon formed in a pipeline due to sudden narrowing of the cross-section. When a fluid passes through a narrow throat, it experiences an increase in velocity and a decrease in pressure. This phenomenon can lead to energy loss and severe fluid oscillation, thereby reducing the efficiency of the system and even causing serious consequences such as oscillation noise and pipeline rupture. Therefore, it is necessary to choose the appropriate size based on the traffic requirements in the work scenario.

Step 4: Consider materials and shapes

The selection of materials is also very important. Hydraulic fittings are usually made of metal materials, such as steel, copper, or aluminum. These materials have good strength and corrosion resistance, and can work under high pressure while maintaining stability. In addition, the material of the hydraulic fitting also needs to be compatible with the liquid used in the system to avoid chemical reactions causing fitting failure. The shape also has a significant impact on the performance and operation of hydraulic fittings. Common hydraulic fitting shapes include right angle, T-shaped, Y-shaped, and cross shaped. Choosing the appropriate shape depends on the layout and operational requirements of the hydraulic system. For example, in compact pipeline installations, right angle fitttings can save space and simplify pipeline connections. Y-shaped and cross shaped fittings are suitable for the diversion and convergence of multiple pipelines.


In addition to the four main considerations mentioned above, there are also other secondary factors that need to be considered. For example, operating environmental conditions such as temperature, humidity, etc. can also have an impact on the size selection of hydraulic fittings. In high temperature or humid environments, hydraulic fittings may be corroded or oxidized, so it is necessary to choose materials that are resistant to high temperature and corrosion, and appropriately increase the size to improve stability and reliability. In addition, service life is also a factor that needs to be considered. Choosing the appropriate hydraulic fitting size can extend its service life and reduce the frequency of maintenance and replacement. Hydraulic fittings that are too small in size are prone to excessive stress, making them prone to breakage or damage; Hydraulic fittings that are too large in size may increase the system's load and affect overall efficiency. Therefore, when selecting the size of hydraulic fittings, the above factors must be comprehensively considered to ensure that the fitting function is not affected and can operate stably and reliably for a long time.

In summary, when selecting the size of hydraulic fittings, it is necessary to comprehensively consider factors such as application working pressure, pipeline diameter, flow rate, and operating environment. By analyzing these requirements, it can be ensured that the function of hydraulic fittings is not affected, while also making performance more stable and reliable, and extending their service life. Only by selecting the right size can a solid foundation be provided for the normal operation of hydraulic systems and better services be provided for hydraulic applications in various industries.

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