Short Description
A butterfly valve is a type of valve used to regulate, open, or close the flow of fluids (liquids or gases) in a pipeline. It consists of a thin disc (disk) shaped like a butterfly’s wing that rotates on its axis. When the disc is turned parallel to the flow direction, the fluid can pass freely. Conversely, when the disc is turned perpendicular, the flow is shut off.
Key Features
- Absorbs thermal expansion and contraction in pipelines
- Reduces vibration and noise transmission from pumps or equipment
- Compensates for misalignment during installation or operation
- Protects piping, valves, and equipment from excessive stress
- Available in rubber, metallic, or PTFE construction
- Wide range of sizes and pressure ratings
- Easy installation and maintenance
Material Components
- Rubber Type Expansion Joint
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- Body/Bellow : EPDM, NBR, Neoprene, Natural Rubber
- Reinforcement : Nylon cord, Steel wire
- Flanges : Carbon Steel, Stainless Steel, Ductile Iron
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- Metallic Expansion Joint
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- Bellows : Stainless Steel (SS304, SS316, SS321)
- End Connections : Carbon Steel, Stainless Steel (Flanged, Welded)
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- PTFE Expansion Joint
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- Body : PTFE (lined or full body)
- Flanges : Carbon Steel or Stainless Steel
Specifications
- Size Range : DN25 – DN3000 (1” – 120”)
- Pressure Rating : PN6 – PN40 (ANSI Class 150 – 300, higher available for metallic type)
- Temperature Range :
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- Rubber : -20°C to +120°C (depending on material)
- PTFE : -20°C to +180°C
- Metal : -80°C to +600°C
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- Movement Capability : Axial compression/elongation, lateral deflection, angular movement
- End Connections : Flanged, Threaded, Welded
- Applications :
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- HVAC systems
- Water supply & wastewater
- Chemical & petrochemical industries
- Power plants & boilers
- Marine & offshore pipelines
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- Standards :
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- Rubber: EJMA / DIN 4809 / ISO 4633
- Metal: EJMA / ASME VIII
- Testing: Hydraulic & pneumatic test per standard