Compound straight pipe bypass pressure balanced expansion joint

Product Introduction

        1. Product definition and structural composition

Compound straight pipe bypass pressure balanced expansion joint (also known as compound bypass pressure balanced corrugated expansion joint) is a compensation element used in pipeline system, which is composed ofThree sets of bellows(two groups of working bellows and one group of balanced bellows), tie rod, end pipe, head and other structural parts. Its design counteracts the thrust generated by the internal pressure of the pipe by balancing the bellows, enabling stable operation without the need for additional fixed brackets.

        2. Working Principle

• Axial displacement compensation: Through the elastic deformation of the working bellows, the axial displacement of the pipe due to temperature change, vibration and other factors is absorbed.

• Pressure self-balancing: The effective area of the balanced bellows and the working bellows are equal, and the internal pressure thrust cancels each other through the tie rod system to avoid additional load on the fixed bracket.

        3. Core Features

• Compact structure: The design of corrugated pipe with the same specification is adopted, which is small in size and light in weight, and reduces the demand of installation space.

• High stability: The tie rod guide system enhances the compression stability and is suitable for high pressure and high temperature (-20℃ ~450℃) working conditions.

• Economy: Reduce the dependence on fixed brackets and reduce the construction cost of pipeline system.

• Corrosion resistance: The material can be selected stainless steel (such as 304, 316L), carbon steel, etc., to adapt to the corrosive medium environment.

        4. Application Scenario

• Complex pipeline system: Suitable for straight pipelines where fixed brackets cannot be set, such as long-distance conveying pipelines and thermal pipe networks.

• Industrial sector: It is widely used in steam, gas and liquid medium pipelines in electric power, petrochemical industry, metallurgy, shipbuilding and other industries.

        5. Installation and Use Specification

• Pre-deformation treatment: It is necessary to pre-stretch or pre-compress according to the design requirements, and it is prohibited to forcibly adjust the pipeline deviation through bellows deformation.

• Water quality requirements: The water used for pressure test should be clean and non-corrosive, with chloride ion content ≤25ppm, and the condensed water should be discharged from the steam pipe network.

• Operation and maintenance: The valve should be opened and closed slowly to avoid sudden pressure change; Check the hydrophobic device regularly.

        6. Model Examples and Technical Parameters

• Model label: such as1.6TPP600*5+5JRepresents the design pressure of 1.6MPa, the diameter of 600mm, the number of 5+5 corrugated layers, and the welded connection.

• Parameter Range：

• Diameter: DN80~ DN2000mm

• Design Pressure: 1.0~2.5MPa

• Fatigue life: ≥1000 times.

7. Criteria

• Customized Services: Support non-standard design and provide flange/welding connection options to meet the needs of special working conditions.