The correct matching and connection of hydraulic pipeline and joints is the key link to ensure the stable operation of hydraulic system. This process involves many details from model selection to installation operation. Each step needs to follow the corresponding technical specifications to avoid leakage, pressure loss or system failure caused by improper matching. The matching connection between the two is not a simple combination of components, but requires comprehensive consideration of system working conditions, medium characteristics and structural design and other factors, and reliable physical connection and fluid transmission are achieved through scientific methods.
The first prerequisite for matching hydraulic pipeline and joints is to clarify the basic parameters and usage requirements of the system. Different hydraulic systems have different requirements for pressure, flow and medium type, and the model specifications of pipelines and joints must match them. For example, high-pressure systems need to select joints and pipelines with higher pressure resistance grades, while when transmitting special media (such as fire-resistant hydraulic oil or water-based media), the corrosion resistance and compatibility of the material need to be considered. At the same time, the pipe diameter and wall thickness of the pipeline must correspond to the diameter and interface form of the joint. Common interface forms such as threaded, flanged, quick-change, etc. have their specific application scenarios. Only by selecting the appropriate type according to the actual working conditions can the foundation be laid for subsequent connections.
Preparation before connection is an important part of ensuring installation quality. First, it is necessary to inspect the appearance of the pipes and joints to see if there are defects such as deformation, cracks, burrs or thread damage. Any slight damage may cause leakage when the system is running. Secondly, it is very important to thoroughly clean the surface of the components. Residual oil, metal debris or dust will not only affect the sealing effect, but may also enter the system with the medium, causing wear or jamming of hydraulic components. Special cleaning agents and dust-free cloths are usually used for cleaning to ensure that there are no impurities attached to the inner wall of the pipe and the sealing surface of the joint. For newly purchased parts, the protective grease and packaging residues at the factory must also be removed to create conditions for subsequent precise installation.
In the actual connection process, it is necessary to follow the standardized operating procedures to ensure the reliability of the connection. For threaded pipes and joints, an appropriate amount of sealant or raw tape should be applied to the threads first, but care should be taken to avoid the sealing material from entering the interior of the pipe and causing blockage. When connecting, it is necessary to ensure that the axis of the joint is aligned with the pipeline, and to avoid forced twisting or eccentric installation to avoid additional stress that may cause the joint to loosen or the pipeline to deform. The tightening force should be uniform and moderate. Too loose will lead to poor sealing, and too tight may damage the threads or seals. Usually, it is necessary to use a torque wrench to operate within the recommended force range. Although the specific value is not mentioned, the force is controlled by experience or standard process to ensure that the connection is stable without damaging the parts.
The guarantee of sealing performance is the core point of the connection process. Different types of joints use different sealing methods, such as O-ring sealing, metal face sealing or combined sealing, etc., and the installation needs to be carried out according to the characteristics of the sealing form. For example, when using O-ring sealing, it is necessary to check whether the model and material of the sealing ring are correct, whether the installation position is in place, and avoid distortion or scratches; metal face sealing requires the sealing surface to be flat and smooth, and a tight sealing surface is formed by uniform compression during connection. Under high pressure or high vibration conditions, it is also necessary to consider the use of anti-loosening devices, such as locking nuts, stop washers, etc., to prevent the joint from loosening due to vibration and ensure the durability of the sealing effect.
Different types of joints have different precautions when connecting. For threaded joints, attention should be paid to the direction of rotation (left-hand or right-hand) and pitch of the thread to avoid mis-installation; for flange joints, the flange surfaces should be parallel and the bolts should be tightened evenly to prevent flange deformation due to uneven force; for quick joints, the interfaces of the male and female joints should be fully aligned, inserted in place and locked to avoid falling off under pressure due to inadequate connection. For the connection between the hose and the joint, the bending radius and length of the hose should also be considered to avoid excessive bending or stretching to avoid affecting the service life and connection stability of the hose. At the same time, the crimping process of the hose and the joint should also meet the standards to ensure that the crimping amount is moderate to avoid loosening or cracking.
Inspection after the connection is completed is the last step to ensure the safe operation of the system. First, perform an appearance inspection to check whether the connection between the joint and the pipeline is flat, whether there is obvious skew or damage, and whether the seal is exposed or deformed. Then perform a pressure test during the system trial operation phase to observe whether there is leakage at the connection by gradually increasing the pressure. Slight oil leakage may indicate a poor seal and needs to be stopped for inspection in time. During long-term operation, it is also necessary to regularly check the tightness of the joints, especially after experiencing vibration or temperature changes, to prevent loosening due to thermal expansion and contraction or vibration of components. Through continuous maintenance, ensure that the connection between the hydraulic pipeline and the joint is always in a reliable state, providing guarantee for the stable operation of the entire hydraulic system.
