Bellows Movements
BELLOWS MOVEMENTS
There are four basic movements that can be applied to a bellows. These are Axial, Lateral, Angular, and Torsional. The below figures illustrate these movements. Bellows behave like springs in a piping system. When they are compressed, the bellows resist the movement the same as a spring would. The spring rate of a bellows is entirely dependant on bellows geometry and material properties. We are able to vary bellows geometry such as convolution height, pitch, thickness, and the number of plies to provide a bellows to satisfy any customer’s needs.
Axial Movement
Axial movement is the change in dimensional length of the bellows from its free length in a direction parallel to its longitudinal axis. Compression is always expressed as negative (-) and extension as positive (+). The units for axial spring rates displayed in N/mm.
 |
| ▲ Axial Movement (+/- In) |
 |
| ▲ Single Tied Expansion Joint for Axial Movement |
Angular Movement
Angular movement is the rotational displacement of the longitudinal axis of the bellows toward a point of rotation. The convolutions at the inner most point are in compression (-) while those furthest away are in extension (+). The angular capability of a bellows is most often used with a second bellows. The units for angular spring rates displayed in Nm/deg.
 |
| ▲ Angular Movement (+/- Degrees) |
 |
| ▲ Single Hinged Expansion Joint for Angular Movement |
Lateral Movement
Lateral movement is the relative displacement of one end of the bellows to the other end in a direction perpendicular to its longitudinal axis (shear).
Lateral movement can be imposed on a single bellows as depicted below but to a limited degree. A better solution is to incorporate two bellows in a universal arrangement as shown. This results in greater offset movements and much lower offset forces. The units for lateral spring rates displayed in N/mm.
 |
| ▲ Lateral Movement (+/- Degrees) |
 |
| ▲ Tied Universal Expansion Joint for Lateral Movement |
 |
| ▲ Double Hinge Expansion Joint for Lateral Movement |
Torsional Movement
Torsional movement is the rotation about the axis through the center of a bellows (twisting). MEGAFLEXON expansion joints discourage any torsional rotation of metal bellows expansion joints. Torsion destabilizes an expansion joint reducing its ability to contain pressure and absorb movement. If torsion is present in a piping system, hinges, slotted hinges or gimbals are recommended not to have any impact on bellows.
 |
| ▲ Torsional Movement (+/- Degrees) |
We have extensive experience in manufacturing and exporting Expansion Joints.
For more information, please visit our website.
For more information, please visit our website.
#78-12, Seungga-ro 76beon-gil, Gimpo-si, Gyeonggi-do, Korea
Tel:82-31-981-2381~3 / Fax:82-31-981-2384
E-mail: sales@megaflexon.com (for Domestic) / info@megaflexon.com (for International)
Tel:82-31-981-2381~3 / Fax:82-31-981-2384
E-mail: sales@megaflexon.com (for Domestic) / info@megaflexon.com (for International)
Copyright 2020. MEGAFLEXON Co., Ltd. All rights reserved.
#megaflexon, #expansionjoints, #expansionjoint #metalexpansionjoints, #rubberexpansionjoints, #metalexpansionjoint, #rubberexpansionjoint, #bellows #petrochemical, #refinery, #industries, #universaltype, #koreaindustries, #메가플랙슨 #신축이음관, #발전소, #석유화학플랜트, #원자력발전소, #열병합발전소, #산업용호스, #플랜트엔지니어링 #벨로우즈
댓글
댓글 쓰기