CEJN hose fittings Germany CEJN models CEJN prices

CEJN hose fittings are widely used in high-pressure piping applications in industrial fields, such as ships, offshore oil, metal processing, and mining. Flared tube fittings are suitable for hydraulic, lubrication, high-pressure water jetting, and high-pressure air pipelines. Flared tube fittings have been certified by many auditing bodies; they offer high reliability, inherent cleanliness, and strong flexibility, with faster and simpler pre-processing assembly and installation. Flared connections require no welding, saving subsequent processes such as pickling and flaw detection. Flared tube fittings are a type of quick-connect fitting suitable for various pipe fittings and pipes with a nominal pressure not exceeding 32MPa. According to the manufacturer, flared connections are widely used in industries such as oil refining, chemical, light industry, textile, national defense, metallurgy, aviation, automotive, pharmaceutical, machinery, shipbuilding, natural gas, and CNG refueling stations.

CEJN hose fitting selection

Metal hose assemblies consist of a metal hose body, a stainless steel wire mesh braid, and fittings. They can compensate for certain relative displacements and provide vibration damping and noise reduction effects. However, improper selection may not only fail to achieve vibration isolation and noise reduction but also cause pipeline leaks or even equipment failure due to damage to the metal hose. The selection of metal hoses mainly involves the correct choice of parameters such as nominal diameter, connection type, working pressure, temperature correction, minimum bending radius, and hose length. Nominal diameter, connection type, and working pressure are directly determined by the pipeline system requirements and generally pose no issues. It is worth noting that when selecting the design pressure of the hose (which should be greater than the system working pressure), it should not be excessively high, because as the pressure-bearing capacity of the hose increases, its bending capability decreases significantly. Temperature correction and minimum bending radius are fixed for the product and provided by the manufacturer. Problems often arise in the selection of the metal hose length; an excessively long hose can cause instability, increase flow resistance, and lead to additional mechanical damage and vibration issues, while an excessively short hose may fail to achieve compensation, vibration damping, and noise elimination, and may also cause excessive bending stress, affecting service life.

CEJN hose fitting differences

The difference between internal threads and external threads is as follows: internal threads are female threads, with the threads located inside the hole; external threads are male threads, with the threads located on the outer surface of the cylinder. Internal and external threads are industry terms referring to the thread mating process used in screw and nut connections. Screw and nut mating allows for easy disassembly and convenient installation, making it one of the commonly used connection and fixation processes in the installation of mechanical equipment, pipelines, and metal structures. For different names of the same type of pipe fitting, remember this simple rule: internal connectors have external threads; external connectors have internal threads. Threaded fittings are generally used in pipelines for connection purposes. External threads refer to threaded ports on the outside of pipelines, which can usually be touched directly; internal threads refer to threaded ports inside pipelines, which generally require reaching inside to touch. In industry, you may also encounter right-hand threads and left-hand threads. Right-hand threads tighten in the direction of 'left loose, right tight'; this type of thread is common in daily life, with screws being the most typical example. Left-hand threads must be tightened in the reverse direction; this type of thread is less common in daily life but is frequently seen in specialized fields such as ventilation.

CEJN hose fitting applications

Pipe fittings are connection tools between pipes and serve as detachable connection points between components and pipes. They play an indispensable role in pipe assemblies and are one of the two main components of hydraulic piping. Pipe fittings are used for straight-line connections, such as for instruments, with connection types including socket weld or threaded connections. They are mainly used for small-diameter, low-pressure pipelines, particularly at locations requiring frequent assembly and disassembly, or for final adjustments in pipelines using threaded fittings. The structural design should preferably adopt a metal-to-metal contact seal. Gasket-sealed structures are typically used in general pipelines transporting water, oil, air, etc., and are manufactured from malleable cast iron. Additionally, usage requirements and price are factors considered during selection. Pipe fittings come in many varieties; commonly used fittings can generally be categorized into hard-pipe fittings and hose fittings. Based on the connection method between the fitting and the pipe, hard-pipe fittings include flare-type, compression-type, and welded types, while hose fittings are primarily crimped hose fittings. In hydraulic systems, the connection methods between pipes and fittings also vary; the pipe end inserted into the fitting uses a connection thread. Tapered threads rely on their conical shape for tightening and use materials such as polytetrafluoroethylene (PTFE) for sealing, mainly applied in medium- and low-pressure hydraulic systems. Fine-thread threads offer excellent sealing performance and are frequently used in high-pressure systems, but they require combination washers or O rings to seal the end face. Copper washers are sometimes used, which are more suitable for pipes with thicker walls. Its main components include the fitting body, tube stub, and nut. During use, the fitting body is inserted into the target, and the aforementioned washers are used to seal the end face. Rubber seals are used between the fitting body and the tube stub, and spherical sealing methods are sometimes employed. As pipe fittings are detachable connection elements, in addition to meeting requirements for stable connection, strong sealing, reasonable dimensions, low pressure loss, and good manufacturability, they must also meet the requirement for convenient assembly and disassembly. Therefore, do not underestimate these small pipe fittings, as their existence supports the entire hydraulic system.

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