Telescopic butterfly valve is quite special among the many types of butterfly valves. It is mainly composed of butterfly valve body, expansion joint and operating device. The main feature of the telescopic butterfly valve is that its expansion joint can axially telescopic within a certain range. It can also somehow overcome the offset caused by the different axes of the pipes butting within a certain angle range. And also telescopic butterfly valve can effectively improve the installation, replacement and disassemble of the valve pipelines. Telescopic butterfly valve is suitable for water conservancy projects of large diameter pipelines, such as drinking water, pure water, water treatment, water supply and drainage pipelines and industrial environmental protection system pipelines as a connecting, switching and adjusting device.
Technical parameters of telescopic butterfly valve:
Common Model Nos: soft sealing types-SD341X, SD343X,SD641X, SD643X, SD941X, SD943X
Metal hard sealing types: SD341H, SD343H, SD641H, SD643H, SD941H, SD943H
Nominal diameter: DN50-DN4000MM
Nominal pressure: 1.6Mpa-4.0Mpa
Applicable working temperature: -29℃-425℃.
Applicable mediums: fresh water, clean water, waste water
Body material: ductile cast iron, cast steel, stainless steel
Operating device: manual, electric actuator, pneumatic actuator;
Flange standard: GB/T4216.4-1984
Face to face standard: GB/T12221-1989
Pressure test: GB/T13927-1992
How to select a telescopic butterfly valve:
Telescopic butterfly valve can be divided into two types in structure: concentric type telescopic butterfly valve and eccentric type telescopic butterfly valve. With different operating device used, It is also divided into worm gear box operated telescopic butterfly valve, pneumatic actuated telescopic butterfly valve, electric actuated telescopic butterfly valve. With different sealing material used, there are soft sealing telescopic butterfly valve and metal hard sealing telescopic butterfly valve. Soft sealing telescopic butterfly valves are generally used in clean water with temperature T≥80℃, and pipelines without corrosion. Hard sealed telescopic butterfly valves are usually used on steam heat conduction pipes with temperature T≥425℃. Therefore, when selecting a telescopic butterfly valve,it is necessary to clarify the medium, temperature, pressure,etc, so that a proper selection can be made.
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