Aerzener hose fittings Germany Aerzener model Aerzener price

Aerzener hose fitting compression fittings are connection tools between pipes, serving as detachable connection points between components and pipelines. Main pipe fittings come in a wide variety; commonly used pipe fittings are generally classified into hard pipe fittings and hose fittings. Hard pipe fittings include flared, compression, and welded types, while hose fittings are primarily crimped rubber hose fittings. A compression pipe fitting consists of three parts: the fitting body, the ferrule, and the nut. When the ferrule and nut are placed on the steel pipe and inserted into the fitting body, tightening the nut causes the outer side of the ferrule's front end to seat against the conical surface of the fitting body, while the inner cutting edge uniformly bites into the seamless steel pipe, forming an effective seal. It is a sealed pipe fitting suitable for non-corrosive or corrosive media such as oil, water, and gas. The specification requirements for use with aluminum-plastic pipes are relatively flexible. After connection to the pipeline, it features reliable connection and good sealing performance.

Aerzener hose fitting functions

Insert the steel pipe into the ferrule and tighten using the ferrule nut, which presses against the ferrule, causing it to cut into the pipe to create a seal. No welding is required when connecting to steel pipes, which aids in fire prevention, explosion protection, and high-altitude operations, while eliminating drawbacks associated with improper welding. The mechanical advantages and geometric shape of the fitting make this mechanical device a sealing component capable of preventing leaks. This mechanical thrust pushes the rear ferrule against the conical back of the front ferrule, while simultaneously pushing the front ferrule into the tapered recess of the fitting body. The ferrule is compressed onto the conduit by an inward radial force; at this point, withdrawing the front ferrule forms a full-face seal on the tapered recess surface of the fitting body. When hand-tightening feels secure, rotate the ferrule nut further from this manually tightened position to ensure uniform thrust on the seal. This ensures effective sealing even in high-pressure and ultra-high vacuum environments. Therefore, it is a relatively advanced connector used in piping systems for automatic control devices in industries such as oil refining, chemical processing, petroleum, natural gas, food, pharmaceuticals, and instrumentation.

Aerzener hose fitting installation

Installation is the most critical step, directly affecting sealing reliability. Specialized pre-assembly tools are generally required. Fittings with small pipe diameters can be pre-assembled on a vise. The specific method involves using a fitting body as the master, pressing the nut and ferrule onto the pipe. The main types include compression straight-through pipe fittings, compression end-straight pipe fittings, and compression tee pipe fittings. The depth of the conical hole in these fitting bodies often varies, which can result in loose spherical contact between the ferrule and the inner conical surface of the fitting body when a pipe pre-assembled for a straight-through fitting is used for a tee fitting connection, leading to leaks—a problem that is often overlooked. The correct approach is to pre-assemble the corresponding connection end with the same type of fitting as used on the other end of the pipe, maximizing the avoidance of leakage issues. Maintain coaxiality between the pipe and the fitting body as much as possible; excessive pipe deviation will also cause seal failure. Pre-assembly force should not be too high. The inner cutting edge of the ferrule should just embed into the outer wall of the pipe, and the ferrule should not show significant deformation. If the ferrule deforms severely during pre-assembly, it will lose its sealing function.

Aerzener hose fitting precautions

Avoid impact and dropping during handling and storage to prevent damage to interfaces and internal components. When installing on high-temperature fans, ensure concentric mounting as much as possible to ensure proper operation of the rotary joint. The connection between the compression fitting and the pipeline must use a hose; rigid connections are strictly prohibited. Connect the inlet and outlet of the compression fitting directly to the hose whenever possible to reduce the auxiliary weight on the compression fitting and extend service life. For the assembly of the inner pipe within the compression fitting, pay attention to dimensional fit and weight support. For the fit between the inner pipe of an internal-rotation rotary joint and the joint, a tolerance fit of H8/e7 is recommended. Support and anti-rotation for the compression fitting should be appropriate; generally, the rod diameter should be 2mm smaller than the anti-rotation hole to avoid affecting the free adjustment and compensation of the rotary joint. The perpendicularity of the pipe end face to the axis should be less than 0.50. Remove burrs from the end face and chamfer 0.2×450. Apply an appropriate amount of grease to the threaded part and the contact conical surface. Install the compression fitting and nut, paying attention to direction. Hold the pipe fitting and press the end face against the shoulder of the fitting body. Mark the compression fitting and tighten the nut. Ensure the pipe fitting does not rotate, tightening 1.3~1.5 turns. Remove the nut and inspect the ferrule insertion.

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