Straight pipe pressure balanced expansion joint

Product Introduction

Straight pipe pressure balanced expansion joint is a key compensation device used in pipeline system. It is widely used in industrial fields by balancing internal pressure thrust and absorbing displacement. The following is a comprehensive product introduction:

I. Structure and composition

1. Core Components

• Working bellows(Both ends): Responsible for absorbing the axial displacement of the pipe due to thermal expansion and contraction.

• Balanced bellows(Middle): The area is usually twice that of a working bellows, connected by a tie rod and an end plate to balance the internal pressure thrust.

• Stress member: Such as a large tie rod or tongue tube, which transmits and offsets the pressure load and reduces the dependence on the fixed bracket.

• Welded connection or flanged connection to suit different pipe interface needs.

II. Functions and Features

1. Core Functions

• Axial displacement compensation: Absorb the axial expansion and contraction deformation of the pipeline to avoid stress concentration.

• Self-balancing internal pressure: Based on Pascal's static principle, the balanced bellows offsets the internal pressure thrust of the working bellows and avoids the transmission of thrust to the fixed bracket.

• Reduce pier load: Suitable for elevated or complex pipelines, reducing the design difficulty and cost of fixed brackets.

• High stability: The balance bellows is affected by external pressure, the instability wave number is higher, and the deformation resistance is stronger.

• Compact size: Standardized bellows design is adopted, which takes up small space and is flexible to install.

• Long life: Fatigue life is usually more than 1000 times, resistant to high temperatures (-40°C to 550°C) and corrosive environments.

Application Scenarios

1. Sector

• Energy & Electricity: Such as heat pipeline, power plant steam system.

• Petrochemical industry: Conveying high temperature, high pressure or corrosive media.

• Metallurgy & Shipbuilding: Compensate for complex displacements of pipes connecting equipment.

• Horizontal installation of overhead straight pipelines should avoid the occasion of large thrust transmission.

• Long-distance conveyance of the middle section of the pipeline, replacing the traditional high-cost fixed support.

IV. Technical parameters

Installation and maintenance

1. Installation Requirements

• Pre-adjustment: Before installation, it is necessary to pre-stretch or pre-compress through the pull rod to reduce the elastic reaction force.

• Horizontal installation: Suitable for overhead straight pipeline to ensure uniform force.

• Removing tie rod: The small tie rod needs to be removed after installation to avoid affecting the compensation function.

• Check bellows regularly for corrosion or deformation to ensure tightness.

• Avoid welding slag sputtering onto bellows surface to prevent local damage.

VI. Comparison with other types

        sum up: Straight pipe pressure balance type expansion joint achieves self-balancing of internal pressure through innovative structural design, which is an ideal compensation solution for long-distance and elevated pipelines. Its technology has high maturity and wide application range, and it will continue to iterate with the demand of industrial upgrading in the future.