Directly buried corrugated expansion joint

型号：

dn

规格：

dn25-3500

材质：

碳钢，不锈钢

Directly buried corrugated expansion joint > < < Directly buried corrugated expansion joint
The bellows works in a sealed chamber formed by itself, and is guaranteed by its own structure. The bellows always expands and contracts axially, eliminating the need for guide brackets. No maintenance is required after the inspection well and brackets are installed, speeding up the project progress and reducing the project cost.
> Directly buried corrugated expansion joint is also called direct-buried compensator, direct-buried expansion joint, and directly-buried expansion joint. Directly buried corrugated expansion joints are mainly used for axial compensation of directly buried pipelines. Directly buried corrugated expansion joints have bending resistance, so the impact of pipeline sinking can be ignored. Directly buried corrugated expansion joints have the characteristics of large compensation and long life.
> The directly buried corrugated expansion joint can achieve free expansion and contraction compensation under the protection of the shell and guide sleeve. Other properties are the same as those of ordinary corrugated compensators, including its axial compensation amount.
> Directly buried corrugated expansion joint model The compensator produced by our company has a caliber between 1 and 2 pressure levels. If customers have special needs, they can be customized for processing.
Precautions for the use of two parts
> The lining cylinder is used to reduce the mutual contact between the inner wall of the bellows of the expansion joint and the flowing medium passing through it, and plays the role of reducing fluid resistance and protecting the inner surface of the bellows. Also called inner sleeve or guide tube. The material of the inner liner can be the same as the bellows or different from the bellows.
> The limit rod is set on the expansion joint assembly. It is generally a part made of rods or rods. It is mainly used to limit the range of movement of the bellows in normal working conditions in the axial, transverse and angular directions. When the main fixed bracket occurs In the event of failure, this part prevents excessive stretching and compression of the bellows while also controlling all internal pressure loads and dynamic loads resulting from bracket failure.
> The outer cover is a device that provides certain protection to the outer surface of the bellows of the corrugated expansion joint from foreign matter contact or mechanical damage. Sometimes also called protective cover. The main features are fire resistance, tensile resistance and high temperature resistance.
Three installation points
>Directly buried corrugated expansion joints are expansion components used on directly buried pipelines
>The model, specification and pipeline configuration of the directly buried compensator should be checked before installation. conditions and must meet the design requirements
>After the hydraulic pressure test, the accumulated water in the wave shell should be drained as soon as possible, and the inner surface of the wave shell should be dried quickly
>All movable components of the directly buried corrugated expansion joint It must not be stuck by external components or limit its range of movement, and the normal movement of each moving part should be ensured
< Installation and installation precautions for three-way metal corrugated expansion joints
Bellows expansion joints and Foreign matter in the pipe ensures normal movement of the bellows. The direction of the lining tube should be consistent with the flow direction of the medium, and the expansion joint should be equipped with a flow direction mark.
The bellows used in stainless steel bellows expansion joints are formed from thin-walled stainless steel plates. Therefore, during transportation, hoisting and welding, care should be taken not to damage the bellows due to knocking, scratches, arc welding spatter, etc.
Install tie rods or limit tie rods on the expansion joint for lifting.
Precautions for installation of three-way metal corrugated compensator for pulverized coal
Metal corrugated expansion joints have been pre-stretched before leaving the factory. Pre-stretching is not necessary when installing non-metallic expansion joints.
After the metal corrugated expansion joint is installed, all fixed screw roof fans must be removed before the centrifugal fan system is operated.
In order to keep the bellows expansion joint in good working condition, the deformation of the expansion joint, including axial and transverse twisting, etc. cannot be used to correct the installation error of the pipe system position during installation.
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