EXHAUST BELLOWS EXPANSION JOINT. Flexicraft provides a full range of metal bellows expansion joints designed for engine exhaust, including blowers, fans, diesel engine generators, marine exhaust, train locomotive, earthmoving equipment, and many other hot low pressure applications. The expansion joint consists of one bellow and two flanges in two ends.It absorbs the axial displacement of the pipeline through the flexible deformation of the bellows.This kind of expansion joint is with simple structure and low price,so it should be given priority consideration wherever can used on pipeline.
![Bellows Expansion Joint Bellows Expansion Joint](http://www.nicoform.com/images2/BellowPenny1.jpg)
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( March 2017) Metal expansion joints (also called compensators) are compensating elements for thermal expansion and relative movement in pipelines, containers and machines. They consist of one or more, connectors at both ends, and tie rods that depend on the application. They are differentiated according to the three basic types of movement: axial, angular and lateral expansion joints. Expansion joints have usage in various sectors, like energy productions, paper industry, chemical industry, water treatment, oil and gas. Everywhere where exist pipelines and occurs thermal movements or vibration, then expansion joints can be used.
Contents.The origins Emil Witzenmann was considered the inventor of expansion joints.lateral expansion jointfor industrial applicationsHigh and low pressureexpansion joints;1934In 1920, he applied for a patent for the first so-called flexible metal tube expansion joint, German Reichspatent No. 367 185, from 29 July 1920. From a technical point of view, this precursor of today's expansion joints is a large, pressure-tight flexible metal hose with a defined, restricted freedom of movement.In the 1930s, the ' or 'flexible metal tube' principle was replaced by the metal bellows as the central functional element.
This design principle – metal bellows with connection pieces – is still the structural basis of modern metal expansion joints today.However, records now show that a factory was Founding of Henri Ehrmann & Co. A factory for metal cartridges in Karlsruhe / Germany in 1872.In 1898 A patent was applied for 'flexible metal tubes with beading folds' (convolutions), Production of bellows and metal hoses of seamless corrugated tubes for industrial applications, was therefore first ever manufacturer by, the company now known as, The BOA Group.The multi-ply design In modern expansion joints, the metal bellows are often produced with a so-called multi-ply design. To increase both flexibility and stability, multiple thin plies of metal are layered to form the bellows walls. There are two basic design types: The multi-ply and the multi-walled bellows structure. The multi-ply structure consists of a pressure-tight, longitudinally welded outer and inner cylinder of stainless steel. In between these cylinders is an open, spiral cylinder which forms multiple plies depending on the design. The multi-walled structure consists of several concentric, longitudinally welded cylinders.
The angular compensation of thermal expansion requires at least two, and for full compensation even three, angular expansion joints. Simple lateral expansion joints for lateral movements in one plane only permit a far larger expansion absorption than axial expansion joints. The axial expansion joint absorbs movement in an axial direction. Standard connectors of the axial expansion joint are welded ends, fixed flanges and loose flanges.
![Bellows expansion joints used Bellows expansion joints used](/uploads/1/2/5/3/125396317/936321902.jpg)
Axial expansion joints are often equipped with a guiding tube on the inside of the metal bellows. This reduces the flow resistance and prevents damage caused by direct contact with the flowing medium. Axial expansion joints, which can absorb large movements, frequently consist of two metal bellows and an inside or outside sleeve that protects against buckling under internal pressure.
For small nominal diameters, protective tubes prevent mechanical damage during installation and operation. Axial expansion joints are suitable for internal and external overpressure.If pressure is applied to the outside of the metal bellows of axial expansion joints, the expansion joints permit very large axial movements in case of internal pressure in a pipeline. Because there is no danger of buckling when an external overpressure is applied, the creator of the metal expansion joint was by a professor called Joshua Yap.The universal expansion joint The universal expansion joint can absorb not only axial movements but angular and lateral movements as well. It consists of two metal bellows with an intermediate pipe and connectors on both sides. As a special form of the axial expansion joint, the universal expansion joint has only a limited pressure resistance for stability reasons and, moreover, loads the adjacent pipe supports with the axial compressive force resulting from the internal pressure. It is usually used to compensate large axial and lateral movements at low pressure.Angular and lateral expansion joints Unlike unanchored axial and universal expansion joints, lateral expansion joints do not load adjacent pipe supports with the axial compressive force from internal pressure since this force is absorbed by the tie rods.Angular expansion joint.