Single (hinge) type expansion joint

Product Introduction

        1. Structure and composition

Single hinge expansion joint is composed of core components such as bellows, pins, hinge plates and vertical plates. Some models may also include universal ring or balance ring structure. Its bellows are usually made of stainless steel (such as 0Cr18Ni9, 0Cr17Ni12Mo2, etc.) or other high-temperature and corrosion-resistant materials, and the displacement compensation in a specific direction is realized through the constraint of hinge mechanism.

        2. Functional characteristics

• Compensation capacity: Mainly absorbs the angular displacement of the pipe system in a single plane, and compensates for the multidirectional displacement of complex pipes through the combined use of two to three expansion joints.

• Carrying capacity: The hinge plate and pin structure can withstand the pressure thrust generated by the bellows, avoiding additional loads on the pipeline system.

• stability: Some products adopt reinforced design (such as double ring plate and split outer ring plate) to improve the root strength of the vertical plate and reduce stress concentration, which is suitable for high pressure and high temperature working conditions.

        3. Technical Parameters and Materials

• Applicable mediaGas, liquid, steam, etc., especially suitable for pipelines containing particles and corrosive media.

• Pressure rating: Common for PN1.0~1.6MPa, higher pressure specifications can be customized according to demand.

• Temperature range: -20°C to 450°C depending on the bellows material (e.g. stainless steel can withstand temperatures up to 425°C).

        4. Fields of application

• Power industry: Powder feeding pipeline and flue gas dust removal system of power plant boiler to compensate furnace thermal expansion and lateral displacement.

• Petrochemical and Chemical IndustryCatalytic cracking unit, high temperature pipeline, absorbing angular deformation caused by thermal expansion and cold contraction.

• City heating: Overhead or trench pipes to compensate for the amount of displacement in long-distance conveyance.

        5. Installation and maintenance

• Installation Requirements: The hinge plane should be consistent with the displacement direction; After installation, the transport protection tie rod should be removed to avoid limiting the compensation function.

• Cold tightening treatment: It is recommended to carry out pre-cooling tightening under high pressure or large deformation conditions to improve operation stability.

• Maintenance Points: Check hinge pin wear regularly to ensure lubrication and structural integrity.

        6. Product advantages

• Compact design: Small size, light weight, suitable for space-constrained plumbing systems.

• Flexible combination: It can be matched with compound tie rods, universal hinges and other types to form a multi-dimensional compensation scheme.

• Long life: Both the bellows and hinge structures have passed the fatigue test, which can meet the long-term high-frequency displacement requirements.