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Product Introduction
The pressure-balanced bellows compensator is a key component used in pipeline systems, mainly to absorb the displacement of pipelines caused by thermal expansion and contraction or vibration, and at the same time balance the thrust generated by internal pressure, thereby reducing the load on fixed supports and connected equipment. The following is a summary of its main types, structural features and working principles:
1. Main types
Pressure-balanced bellows compensators can be classified into the following types based on their structures and application scenarios:
Straight pipe pressure balanced bellows compensator: Composed of two working bellows and one balancing bellows, the effective area of the balancing bellows is twice that of the working bellows, and the internal pressure thrust is balanced by the pull rod.
Bypass pressure balanced bellows compensator: Composed of an internal pressure working bellows and an external pressure balanced bellows, it is suitable for axial and lateral displacement compensation and has good stability. 210
Curved pipe pressure balanced bellows compensator: Installed at the pipe bend, it can absorb axial and lateral displacements and is suitable for pipeline systems such as pumps and compressors that are sensitive to thrust. 46
Internal and external pressure balanced bellows compensator: Composed of internal pressure and external pressure compensators, it is suitable for high-level pipelines where fixed supports are not appropriate.
Compound tie rod type bellows compensator: It can simultaneously absorb axial and lateral displacements and is suitable for pipeline systems with limited space.
2. Structural features
Straight pipe pressure balanced type: Composed of working bellows, balance bellows, tie rods (threaded or welded), end plates, etc. The area of the balance bellows is twice that of the working bellows, ensuring self-balancing of the internal pressure thrust.
Bypass type: It adopts a double bellows linkage diversion structure to balance the bellows under the effect of external pressure, ensuring higher stability.
Compound pull rod type: It includes spherical washers and conical washers, allowing the pull rod to rotate during lateral displacement and preventing unbalanced forces from damaging the corrugated pipe.
3. How it works
The core principle of the pressure-balanced bellows compensator is to balance the internal pressure thrust through structural design and prevent it from being transmitted to the pipeline or equipment. For example:
Straight pipe type: The internal pressure thrust of the working bellows is transmitted to the balance bellows through the pull rod. Due to the larger area of the balance bellows, the reverse thrust generated counterbalances it.
Bypass type: The working bellows is subjected to internal pressure, while the balancing bellows is subjected to external pressure. Thrust balance is achieved through a linkage structure.
Curved pipe type: Utilizing a curved pipe structure to balance thrust, it is suitable for space pipelines and pump and compressor systems.
4. Application scenarios
Power industry: Used for overhead pipelines in power plants to reduce the number of fixed supports.
Chemical Engineering and petrochemical industry: Suitable for high-temperature, high-pressure, and corrosive medium pipelines.
Water treatment and municipal engineering: For instance, Nantong Chonghai Water Plant adopts bypass compensators to enhance pipeline stability.
Wind tunnels and large industrial equipment: Extra-large compensators are used to balance thermal deformation and reduce the load on supports.
5. Installation and Maintenance Precautions
Straight pipe type: It needs to be installed horizontally. After installation, remove the small tie rod to pre-deform and reduce the elastic reaction force.
Curved pipe type: It needs to be installed at the bend of the pipeline to ensure the correct compensation direction.
Bypass type: It is suitable for occasions where no fixed support is required, and the fatigue state of the corrugated pipe needs to be checked regularly.
Summary
The pressure-balanced bellows compensator, through ingenious structural design, achieves self-balancing of pipeline displacement compensation and internal pressure thrust, and is widely used in various industrial pipeline systems. The selection of the appropriate type should take into account the pipeline layout, medium characteristics and thrust requirements.
1. Main types
Pressure-balanced bellows compensators can be classified into the following types based on their structures and application scenarios:
Straight pipe pressure balanced bellows compensator: Composed of two working bellows and one balancing bellows, the effective area of the balancing bellows is twice that of the working bellows, and the internal pressure thrust is balanced by the pull rod.
Bypass pressure balanced bellows compensator: Composed of an internal pressure working bellows and an external pressure balanced bellows, it is suitable for axial and lateral displacement compensation and has good stability. 210
Curved pipe pressure balanced bellows compensator: Installed at the pipe bend, it can absorb axial and lateral displacements and is suitable for pipeline systems such as pumps and compressors that are sensitive to thrust. 46
Internal and external pressure balanced bellows compensator: Composed of internal pressure and external pressure compensators, it is suitable for high-level pipelines where fixed supports are not appropriate.
Compound tie rod type bellows compensator: It can simultaneously absorb axial and lateral displacements and is suitable for pipeline systems with limited space.
2. Structural features
Straight pipe pressure balanced type: Composed of working bellows, balance bellows, tie rods (threaded or welded), end plates, etc. The area of the balance bellows is twice that of the working bellows, ensuring self-balancing of the internal pressure thrust.
Bypass type: It adopts a double bellows linkage diversion structure to balance the bellows under the effect of external pressure, ensuring higher stability.
Compound pull rod type: It includes spherical washers and conical washers, allowing the pull rod to rotate during lateral displacement and preventing unbalanced forces from damaging the corrugated pipe.
3. How it works
The core principle of the pressure-balanced bellows compensator is to balance the internal pressure thrust through structural design and prevent it from being transmitted to the pipeline or equipment. For example:
Straight pipe type: The internal pressure thrust of the working bellows is transmitted to the balance bellows through the pull rod. Due to the larger area of the balance bellows, the reverse thrust generated counterbalances it.
Bypass type: The working bellows is subjected to internal pressure, while the balancing bellows is subjected to external pressure. Thrust balance is achieved through a linkage structure.
Curved pipe type: Utilizing a curved pipe structure to balance thrust, it is suitable for space pipelines and pump and compressor systems.
4. Application scenarios
Power industry: Used for overhead pipelines in power plants to reduce the number of fixed supports.
Chemical Engineering and petrochemical industry: Suitable for high-temperature, high-pressure, and corrosive medium pipelines.
Water treatment and municipal engineering: For instance, Nantong Chonghai Water Plant adopts bypass compensators to enhance pipeline stability.
Wind tunnels and large industrial equipment: Extra-large compensators are used to balance thermal deformation and reduce the load on supports.
5. Installation and Maintenance Precautions
Straight pipe type: It needs to be installed horizontally. After installation, remove the small tie rod to pre-deform and reduce the elastic reaction force.
Curved pipe type: It needs to be installed at the bend of the pipeline to ensure the correct compensation direction.
Bypass type: It is suitable for occasions where no fixed support is required, and the fatigue state of the corrugated pipe needs to be checked regularly.
Summary
The pressure-balanced bellows compensator, through ingenious structural design, achieves self-balancing of pipeline displacement compensation and internal pressure thrust, and is widely used in various industrial pipeline systems. The selection of the appropriate type should take into account the pipeline layout, medium characteristics and thrust requirements.
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