Rectangular Metal Corrugated Bellows Expansion Joint

Short Description:

Product name: rectangular ripple compensator
Model: DN300-DN2500
Purpose: With axial, lateral, and angular compensation functions
Connection method: 1. Flange connection 2. Pipe connection
Material: Stainless Steel
Pressure: PN 10, PN 16, PN 25, PN 40
Acceptance: OEM/ODM, Trade, Wholesale, Regional Agency,
Payment: T/T, L/C, PayPal

Any inquiries we are happy to reply, please send your questions and orders.
Stock Sample is Free & Available

Product Detail





Product Tags

Product Data

Name Rectangular Metal Corrugated Bellows Expansion Joint
Nominal diameter: DN15mm to DN3600mm, special design available
Maximum working pressure 4.0 M pa
Vacuum KPa(mmHg) 44.9(350)
Operating temperature below 60ºC-280ºC
Corrosion resistance Excellent
Applicable media Sea water, drinking water, exhaust, industrial sewage.

Product Introduction

Bellows Joint (they are also called compensators) are compensating elements for thermal expansion and relative movement in pipelines, containers and machines. They consist of one or more metal bellows, 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 Joins are elastic vessels that can be compressed when pressure is applied to the outside of the vessel, or extended under vacuum. When the pressure or vacuum is released, the bellows will return to its original shape (provided the material has not been stressed past its yield strength).


1. Reasonable structure, good elasticity, large range of compensation pipeline and little counterforce to the brackets of pipeline.
2. Shock absorption and noise decrease, heat and dust insulation, environmental protection and simple structure bracket.
3. The displacement can be deflected to prevent damagment caused by subsidence of connected brackets and equipment base. It can adapt itself to the centrifugal difference of pipeline installation to provide convenience to installation and maintenance.
4. Good resistance to milling, heat, aging and corrosiveness and long service life.
5. Little resistance and little weight. Each performance is better than the compensation device of other materials.
6. The temperature range of media is wide: -40300oC


Welded Bellows Joint can be fabricated from a variety of exotic metals and alloys, whereas formed bellows are limited to alloys with good elongation brass being a prime example. Welded bellows are not fabricated from brass because of its fundamentally poor weldability. Other advantages to welded bellows include compactness (higher performance in a smaller package), ability to be compressed to solid height with no damage, resistance to nicks and dents, and dramatically greater flexibility.
The welding of metal bellows is a microscopic welding process, typically performed under laboratory conditions at high magnification.
Hydroformed bellows are produced by forcing a metal tube to expand under hydraulic pressure inside a bellows-shaped mold, and assume the convoluted shape of the mold.
Electroformed bellows are produced by plating metal onto a bellows-shaped model (mandrel), and the subsequent mandrel removal by chemical or physical means.


Bellows Joint -welded or convoluted (formed), are used in a large number of industrial applications:
Load cells; A load cell deforms if a certain load in the form of a pressure or a strain is imposed on it. This deformation is then detected by a strain gauge through which a low voltage direct current is flowing. The change in voltage is detected and made visible on a control panel. A bellows is mounted over the gauge to protect it from outside influences.
Vacuum interrupters; For the switching of very high voltages in transformer stations sparks should be avoided. To prevent any danger that the surrounding atmosphere will explode, oxygen has to be removed in the area where the sparks occur. This can be done by sealing the spark area completely. Bellows are used to seal such confined volumes and the inside of the bellows is evacuated or filled with an inert gas.
Mechanical Seals; These are mostly used to close the inside of a pump from the outside world to prevent leakage. For that purpose, a mechanical seal is mounted on the pump shaft. As the pump shaft is turning, there has to be a sealing element consisting of a stationary and a rotating ring. To enforce sufficient pressure on the two rings one is fitted with a spring. This spring can also have the form of a diaphragm (welded) bellow.

Square bellow expansion joint is composed of a rectangular corrugated pipe and two rectangular end nozzles. The end pipe can be directly welded to the pipeline, or welded with a flange before connecting to the pipeline. The pull rod on the compensator is mainly a rigid support during transportation, not a load-bearing component.

There are 98 specifications(300×400~2800×3000) of rectangular metal expansion joints by their different DN.

Rectangular corrugated compensator as a new material, which is used for marine fan, pipe fan, boiler fan, air conditioning fan, smoke exhaust fan and roof fan.

The rectangular ripple compensator has advantages such as durability, high temperature resistance, high pressure resistance, anti-corrosion, and environmental protection. It can effectively solve the problems of unsanitary, easy aging, unstable pressure resistance, easy delamination and tearing, and explosion caused by old-fashioned rubber expansion joint. In addition, it can effectively reduce host vibration, absorb pipeline noise, protect equipment, and extend equipment service life.

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    1.Professional manufactory.
    2.Trial orders are acceptable.
    3.Flexible and convenient logistic service.
    4.Competitive price.
    5.100% testing,ensuring the mechanical properties
    6.Professional testing.

    1.We can guarantee the best material according to related quotation.
    2.Testing is performed on each fitting before delivery.
    3.All packages are adapt for shipment .
    4. Material chemical composition is conformed with international standard and environment standard.

    A) How can I get more details about your products?
    You can send an email to our email address. We will provide catalogue and pictures of our products for your reference.We can also supply pipe fittings, bolt and nut, gaskets etc. We aim to be your piping system solution provider. 

    B) How can I get some samples?   
    If you need, we will offer you samples for free, but new customers are expected to pay express charge. 

    C) Do you provide customized parts? 
    Yes, you can give us drawings and we will manufacture accordingly. 

    D) To which country have you supplied your products?
    We have supplied to Thailand, China Taiwan, Vietnam, India, South Africa, Sudan, Peru , Brazil, Trinidad and Tobago, Kuwait, Qatar, Sri Lanka, Pakistan, Romania, France, Spain, Germany, Belgium, Ukraine etc. (Figures here only include our customers in latest 5 years.). 

    E) I can’t see the goods or touch the goods, how can I deal with the risk involved?  
    Our quality management system conforms to the requirement of ISO 9001:2015 verified by DNV. We are absolutely worth your trust. We can accept trial order to enhance mutual trust.

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