General characteristics

Bellows expansion joints are installed in circuits through which liquid or superheated steam circulates under high pressure. They are used in chemical production, power engineering, gas, and oil refining industries. They successfully dampen vibration and thermal expansion of the circulation system. Such expansion joints successfully resist cyclic deformations, dampen pressure drops, are heat-resistant, and can operate in vacuum conditions or in an aggressive environment. They can be installed anywhere in the pipeline, dampen cyclic and static loads, are quite compact, inexpensive, do not require maintenance during operation, and reduce the cost of repair and maintenance of pipelines.

Design Features

The basis of the compensator is one or more bellows, with limiting, connecting and protective fittings. The bellows is a single-layer elastic or multi-layer corrugated shell for separating media and maintaining axial stability, strength and tightness under cyclic transverse, longitudinal angular and bending loads under the action of differences in operating pressure, temperature or mechanical forces.

The compensator is equipped with protective and connecting fittings that optimize the load on the bellows. Compensators can be of any design, for example: hinged, cardan or angular.

Usage

Oil, chemical industry, power engineering, gas supply, automobile manufacturing, automatic machinery, motor engineering, shipbuilding, heating networks and mains, space and nuclear complex, as well as heating systems of multi-story buildings. Such compensators are suitable for pipelines of various technological systems. They can connect pipes of different types, seal the pipeline, remove and absorb exhaust gases.

Advantages of bellows expansion joints:

Designation	Type	Description
	before the stuffing box	no problems due to leaks and wet thermal insulation; no leaks; significantly cheaper to maintain.
	in front of U-, L- and Z-shaped	possibility of installation in hard-to-reach places; small geometric dimensions; low compression rigidity, which significantly reduces the load on fixed supports; hydraulic low resistance; significantly shorter installation times and costs.
	before the lens	providing much greater axial movement; bellows expansion joints can be manufactured and designed for specific tasks; more durable.

Products

Bellows expansion joints have the following qualities:

Bellows axial compensator KSO

This type of compensators is used to compensate for temperature changes in straight sections of heating networks with any installation methods. On a straight section, when the temperature regime of the heating network changes between fixed supports, the pipeline receives an insignificant increase in length due to temperature elongation. In this case, the resulting compression or tension stresses, as a rule, lead to bending and destruction of pipes. The bellows corrugations of the axial bellows compensator KSO installed on this section, deforming elastically, perceive the elongation of the pipeline section within their compensating capacity. It is used on pipelines of water heating, pumping units, consumer heating networks and other heating structures, devices and mechanisms, electric stations.

Bellows shear expansion joints

Capable of perceiving and compensating transverse movements, as well as shifts in relation to their own axis. The design includes guide and limiting rods, support flanges, cables, and protective special casings and internal guide screens can also be mounted, which are attached to the pipeline using various types of connecting fittings. Manufactured in two modifications: single-bellows or double-bellows. Working environments: oil products, steam, gas, water, etc.

Corner bellows expansion joints

Corner bellows expansion joints have a large bending angle with relatively small dimensions. They are mainly used in the chemical industry, as well as in heat supply networks. Corner bellows expansion joints are mounted in non-straight pipelines that have elbows in several or one plane. During thermal expansion of straight sections of pipes, the sections adjacent to them and located at an angle to the first ones can experience bending moments, which lead to bending of the pipes. Pipeline anchor fastenings can experience significant loads, which can lead to destruction of the anchor fastenings. Bellows angular expansion joints are used to compensate for such deformations. They are also used during pipeline laying, in cases of changes in the direction of the pipeline route (insignificant angles between sections).

Compensating bellows device SKU.PPU.

This device, consisting of a single-section or two-section bellows compensator, which is made of stainless steel, is enclosed in a protective steel casing (in order to maintain the coaxiality of the compensator and protect the bellows from mechanical damage).

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