FESTO hose fittings Germany FESTO model FESTO price

FESTO hose fittings connect different hydraulic components to form a closed-loop hydraulic system, serving as a connecting accessory. They connect different hydraulic components (pumps, delivery lines, directional valves, shut-off valves, hydraulic motors, hydraulic cylinders, and some auxiliary components such as level gauges, thermometers, pressure gauges, etc.) to form a closed-loop hydraulic system, acting as a connecting accessory.

FESTO hose fitting selection

What is the material for hydraulic pipe fittings? Ordinary hydraulic oil is not corrosive to steel pipes and steel fittings, so carbon steel fittings are widely used in hydraulic systems. Carbon steel should not be used for pipelines carrying drinking water or pure water. Previously, brass pipes were specified for compressed air because compressed air carries moisture that accumulates inside the pipe; using carbon steel pipes would cause corrosion. Advanced air compressors no longer produce moisture, so this rule has lost its significance. Chemical equipment pipelines usually transport various corrosive fluids and require frequent flushing with solvents or water. Therefore, general chemical pipelines must be made of stainless steel. When considering the corrosiveness of the medium, the primary consideration should be the relationship between the pipeline seals and the medium. Nitrile rubber is widely used in hydraulic systems due to its compatibility with ordinary hydraulic oil. At certain temperatures, nitrile rubber is also compatible with synthetic acetaldehyde, glycol-based chemical liquids (HEPG), and plant-derived liquids. However, nitrile rubber (NBR) is not suitable for contact with acidic media, benzene, or synthetic oils at high temperatures; in these cases, fluorocarbon rubber (FKM) should be used. Conversely, methane and refrigerant ammonia are only compatible with nitrile rubber (NBR), so most chemical stainless steel pipelines use rigid seals. When selecting pipe fittings, it is necessary to know the nominal pressure of the fitting. Nominal pressure is a standard parameter numerically equal to the maximum working pressure of the system. The maximum working pressure must satisfy a static safety factor of 4 times and a dynamic safety factor of 1.33 times, i.e., the burst pressure determined by burst testing divided by 4, and the maximum pulse pressure divided by 1.33, taking the smaller of the two values as the defined maximum working pressure. When selecting pipe fittings, the maximum working pressure of each fitting must be at least equal to the maximum set working pressure of the entire hydraulic system. One must consider not only the pump outlet pressure but also the relief valve cracking pressure. Therefore, when designing complex hydraulic pipelines, it is best to determine actual pressures through on-site measurement. Once the system working pressure is determined, check the maximum working pressure of each selected pipe fitting. The maximum working pressure of a pipe fitting may vary depending on the sealing method or temperature changes: the same pipe fitting will achieve a higher working pressure with elastic sealing than with rigid sealing.

FESTO hose fitting functions

Whether pneumatic quick-connect fittings or manual quick-connect fittings, they are both tools for sealed connections, differing in whether they are driven by air pressure or manually. In different application projects, the roles and advantages of pneumatic quick-connect fittings vary. Stainless steel tubes have a smooth surface, high hardness, and resistance to high temperatures and pressures, making them commonly used as materials for precision equipment components. Qualified inspections of stainless steel tubes are required, including air tightness testing. According to feedback from test engineers, as shown in the figure above, one end of the stainless steel tube has been welded shut, and pressure needs to be applied from the other end to test the seal of the weld. In this case, pneumatic quick-connect fittings can be used with an external wrap-around sealed connection to ensure faster pressurization. After connecting the corresponding air hoses to the fittings, if used for automated or semi-automated operations, the mounting holes must also be connected to the corresponding cylinder fixtures. Here, the role of the pneumatic quick-connect fitting is to provide sealed connectivity for pipe components, assist in testing, improve test efficiency, and enhance test stability. Its advantages include more convenient pneumatic operation, sealing rings that clamp the tube wall without causing scratches, and stable sealing for more accurate test results. In practical applications, one end of a plastic pipe component is connected to the equipment, which pressurizes internally via other methods; here, the pneumatic quick-connect fitting serves to seal the pipe opening. Plastic pipe components generally have low hardness, are easily damaged, and are prone to scratching. Due to batch production and testing, pneumatic fittings are needed to integrate automated operations. Their advantages include being gentle on the test piece tube wall without causing scratches, suitability for various pipe materials and properties (including some hoses), and ease of integration into automated operations to improve efficiency.

FESTO hose fitting usage

The connection between hose fittings and hoses is generally completed using a hose crimping machine. First, cut the hose to the required length, then strip the outer cover of the hose to the measured dimensions, install the hose fitting, and finally crimp it using the hose crimping machine. The specific steps are as follows: 1. Select the appropriate hose and cut it to the specified length. 2. Strip the outer rubber cover from both ends of the hose. 3. Select the appropriate type of hose fitting. 4. Install the fitting insert (apply oil) and then install the hose fitting sleeve in sequence. 5. Crimp using the crimping machine, ensuring the appropriate crimp amount is selected. 6. After crimping is complete, clean rubber debris from the inner wall of the hose, then install the dust cap, sealing ring, and retaining ring.

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