BORELLI hose fittings Germany BORELLI model BORELLI price

BORELLI hose fittings: In piping systems, elbows are fittings that change the direction of the pipeline. Classified by angle, the three most common types are 45° and 90°180°. Additionally, depending on engineering requirements, other non-standard angle elbows such as 60° are included. Elbow materials include cast iron, stainless steel, alloy steel, malleable cast iron, carbon steel, non-ferrous metals, and plastics. Connection methods to pipes include: direct welding (the most common method), flange connection, hot melt connection, electrofusion connection, threaded connection, and socket connection. According to production processes, they can be divided into: welded elbows, stamped elbows, push-formed elbows, cast elbows, butt-welded elbows, etc. Other names: 90 degree elbow, right-angle elbow, etc.

BORELLI hose fitting selection

Chemical equipment pipelines usually transport various corrosive fluids and require frequent flushing with solvents or water. 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 because it is compatible with standard hydraulic oils. At certain temperatures, nitrile rubber is also compatible with synthetic acetaldehyde, glycol-based chemical liquids, and plant-derived liquids. However, nitrile rubber is not suitable for contact with acidic media, benzene, or synthetic oils at high temperatures; in these cases, fluorocarbon rubber should be used. Conversely, methane and refrigerant ammonia are only compatible with nitrile rubber. Therefore, most chemical stainless steel pipelines use rigid seals. 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. It is necessary to consider not only the pump outlet pressure but also the relief valve cracking pressure. The maximum working pressure of hydraulic pipe fittings may vary due to different sealing methods or temperature changes: similarly, selecting elastic seals for pipe fittings will yield higher working pressures than rigid seals.

BORELLI hose fitting applications

Quick-connect fittings, also known as self-locking fittings or quick-insert sealed fittings, allow securing pipes and fittings through simple operation without tightening nuts or using clamps. They can withstand high pressures, 70Bar or even higher. Flanged ports or straight round pipes in cooling water channels typically require clamps for ordinary fittings, which involves multiple steps and offers poor pressure resistance. With technological advancement, besides self-locking quick-connect fittings, pneumatic quick-connect fittings (automated quick-connect fittings) are more suitable for industrial automation production, utilizing pneumatic drive. The purpose of using quick-connect fittings is speed; modern mechanized production emphasizes efficiency and reducing operator workload. Their speed is reflected in: easy handling, fewer operational steps, simple operation, automatic locking, and sealing/disconnection requiring only one insert and one pull, making them much more convenient than ordinary fittings.

BORELLI hose fitting working principle

1, the basic structure of this type of fitting is relatively simple, consisting of only three basic parts: the fitting body, the ferrule, and the nut. The main component is the ferrule, which is a metal ring with a cutting edge at the front. International standard GB3764-83 recommends a unified I type shape for the cutting edge. 2, the ferrule, which plays the main sealing role, moves axially along the inner conical hole of the fitting body under the axial force of the tightening nut R. Simultaneously, the cutting edge end undergoes radial contraction under the radial reaction force R', eliminating the gap between the ferrule and the pipe, causing the cutting edge to contact the pipe surface. At this point, the pipe no longer rotates; continuing to rotate the nut causes the ferrule cutting edge to firmly bite into the pipe to ensure sealing. Another sealing element is the tight contact between the intersection line (edge) of the 13° chamfer at the ferrule cutting edge end and the outer circle, and the annular conical surface of the fitting body, forming a sealing band, which is the main sealing area of the ferrule-type seal. The rear 86° conical surface of the ferrule undergoes radial contraction under the force of F, tightly gripping the connected pipe, while the middle part bulges slightly. Thus, the ferrule has axial elastic deformation, which plays a beneficial role in ferrule sealing and preventing the tightening nut from loosening.

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