I. Valve expansion joint

Valve expansion joints, commonly known as metal expansion joints or compensators, are mainly made of metals such as stainless steel or carbon steel.

1. Core functions:
Mainly used to compensate for linear (axial) displacement caused by thermal expansion and contraction of pipelines. When the temperature of the medium inside the pipeline or the ambient temperature changes, the pipeline will expand or contract. If no compensation measures are taken, significant thermal stress may damage pipeline supports or equipment connection points.

2. Other important functions:

Compensate for installation errors: Allow for a certain degree of axial adjustment during the installation of valves or equipment connections to facilitate alignment.

Absorption of vibration: It can absorb slight mechanical vibrations generated by equipment such as pumps and compressors to a certain extent.

Protecting valves and equipment: By absorbing displacement and vibration, it reduces the stress transmitted to sensitive equipment such as valves and pumps, extending their service life.

Easy to maintain: When the valve needs to be replaced or repaired, the expansion joint can be compressed or stretched to provide operating space without requiring significant movement of the pipeline.

3. Main features:

High temperature and pressure resistance: Due to their metal structure, they can withstand high temperatures and pressures.

Corrosion resistance: Different materials (such as 304 and 316 stainless steel) can be selected according to the medium to resist corrosion.

Long service life: Under correct operating conditions, they have a longer fatigue life.

Multiple forms of compensation: In addition to basic axial compensation, there are various other forms such as lateral and angular compensation (such as hinge type and universal joint compensator).

4. Typical application scenarios:

Thermal pipeline: a system with significant temperature changes, such as steam pipelines and hot water heating pipelines.

Industrial pipelines: high-temperature and high-pressure pipelines in industries such as petroleum, chemical, and power generation.

Long distance transportation pipeline: It is required to set compensation points in sections to absorb accumulated thermal displacement.

2、 Rubber joint

Rubber joints, also known as rubber flexible connectors or shock-absorbing joints, are mainly made of natural or synthetic rubber (such as chloroprene rubber, nitrile rubber, EPDM), reinforced internally with nylon ropes or steel wires.

1. Core functions:
Mainly used for vibration reduction, noise reduction, and compensating for multi-directional displacement. Rubber materials themselves have excellent elasticity.

2. Other important functions:

Compensating for multi-directional displacement: It can simultaneously compensate for axial, lateral, and angular displacement, providing greater capability in this regard compared to standard valve expansion joints.

Reduce noise: effectively isolate and reduce structural noise generated by water flow and pump operation.

Corrosion resistance: It has good resistance to various acidic and alkaline media (suitable rubber types need to be selected according to the media).

Good sealing performance: Provides excellent sealing performance.

3. Main features:

Excellent elasticity and damping performance: This is its most prominent advantage.

Adapt to multi-directional displacement: A single component can solve displacement problems in multiple directions.

Limited temperature and pressure resistance: Compared with metal expansion joints, rubber joints have lower temperature and pressure ratings.

Aging issue: Rubber materials will age over time and require regular inspection and replacement.

4. Typical application scenarios:

Pump inlet and outlet: This is the most classic application, used to absorb pump vibration and noise, and protect pipeline systems.

HVAC water system: chilled water and cooling water pipelines used for vibration reduction and displacement compensation.

Water supply and drainage system: municipal water supply and building water supply and drainage pipelines, used to reduce water hammer effects and pipeline displacement.

Corrosive medium pipeline: a pipeline for transporting chemical reagents (special corrosion-resistant rubber type needs to be selected).


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