Introduction of extended stem butterfly valve-Belo Valve

The extended stem butterfly valve is a common switch and adjusting valve on water conservancy engineering pipeline. It is mainly composed of (soft sealing butterfly valve, metal hard sealing butterfly valve), extended stem, bolts and gasket. The structure of extended stem butterfly valve is divided into concentric structure and eccentric structure. Its end connect includes flange type end connect and wafer type end connect. And extended stem butterfly valve has reliable sealing performance. 

Extended stem butterfly valve can be used in some special occasions, like installed on several meters deep underground pipelines, as well as deep wells, high towers, it can be installed without the affect of the environment. The sealing material and structure type of extended stem butterfly valve can be decided according to the real working conditions.the working principle of extended stem butterfly valve is to use the rotation of the top operating device(clockwise, counterclockwise) to push the valve stem to drive the disc to tightly close to the sealing surface to realize the sealing effect of the butterfly valve. 

Technical parameters of extended stem butterfly valve: 

Nominal diameter: DN50mm-DN1400mm

Sealing types: soft sealing and metal hard sealing

Applicable working temperature: -29℃-425℃

Applicable working mediums: waste water, clean water, air

Extended stem length: customized 

End connect types: flange, wafer, welded

End connect standard: GB/T9115-1988

Face to face standard: GB/T12221-1989 

Pressure testing standard: GB/T13927-1992 

Applications of extended stem butterfly valve: 

Extended stem butterfly valve is mainly used in water plants, hydro-power plants, chemical plants, environmental protection, sewage, drainage, drinking water and other pipeline systems. The opening and closing of the valve plate is driven by the driving device on the top to complete the opening and closing of the butterfly valve. 

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