The concentric butterfly valve is a mainstream general-purpose valve applied for fluid cut-off and flow adjustment across industrial and municipal piping systems, consisting of five indispensable core parts including valve body, butterfly disc, valve stem, flexible sealing base and supporting driving accessories. With concentric symmetrical mechanical layout, the round butterfly disc rotates around the central axis of the valve stem to realize full opening, complete shutoff and precise flow adjustment. Compared with eccentric butterfly valves with complicated production processes, the concentric butterfly valve features simplified machining steps and lower overall production cost, which fits most conventional working environments involving normal pressure and common media.

Its prominent advantage lies in soft sealing performance. Sealing bases made of elastic rubber and high-molecular composite materials offer reliable elastic compensation after valve closure, achieving bidirectional bubble-tight sealing to stop leakage of clean water, wastewater, compressed air and other conventional fluids. The valve supplies wafer and flanged connection forms. The straight-through flow channel reduces flow resistance, and lightweight construction eases pipeline layout and installation work. Manufacturers provide diversified material choices; users select cast iron, ductile iron, carbon steel or stainless steel for valve bodies and discs according to corrosion levels. Multiple sealing rubber types such as EPDM, NBR, FKM and silicone rubber can be matched to adapt to different temperatures and chemical media. Customers may choose manual handwheel, worm gear, pneumatic, electric or hydraulic drivers to fulfill local manual operation and remote intelligent automatic control.

Uniform abrasion on sealing parts during rotation reduces operating torque, allowing low-power driving parts to finish valve switch actions. The whole structure has few components. Operators can replace worn sealing seats without detaching the whole valve from pipelines, cutting routine maintenance costs. This valve is widely deployed in municipal water supply and drainage, building HVAC, chemical production, power generation, metallurgy as well as food and pharmaceutical pipelines. Operators must ensure parallel pipeline flanges, clear pipeline internal debris before installation, and conduct regular inspections on sealing status and driving operation to keep stable sealing capacity and extend total service life.

Parameter Item	Parameter Range	Remarks
Nominal Diameter	DN40~DN2000	Extra-large sizes available upon customization
Nominal Pressure	PN1.0~PN1.6 MPa	PN2.5 MPa high-pressure version customizable
Operating Temperature	-20℃ ~ +120℃	EPDM max 120℃; FKM max 200℃
End Connection	Wafer, Flanged	Wafer for small/medium bore; flanged for large bore and high pressure
Sealing Performance	Bubble-tight (air & hydrostatic test qualified)	Conforms to GB/T 13927, API 598
Actuation Mode	Handwheel, worm gear, pneumatic/electric actuator	Modulating actuators optional for remote control

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Concentric Butterfly Valve