DN2000 Double eccentric butterfly valve
Pressure Rating: PN16/PN25
Material: Ductile Iron
Design Standard: DIN3352 F4, LIGHT TYPE
Inspection Standard: EN12266
Application medium: Drinking water, sewage, seawater, irrigation or other neutral liquid
Application Temperature: -40°C～150°C
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Brief introduction of double eccentric butterfly valve:
D342X, D942X, D342Xs, and D942Xs type rubber sealed butterfly valve adopts double eccentric structure, absorbs the structure and characteristics of similar foreign products, overcomes the defects in the use of the original product, and makes its life more durable and more reliable sealing. Double eccentric butterfly valve is suitable for various pipelines, specially installed in the outlet of the circulating water pump, for cutting off or regulating the flow of the medium, and can inhibit the impact effect produced when the pump starts and stops, without being affected by the flow direction of the medium.
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Advantages of double eccentric butterfly valve:
Small valve opening and closing torque
Due to the existence of eccentricity, when the valve is closed, the sealing surface is a gradual entry and exit process, thus reducing the mechanical wear and extrusion between the sealing surfaces.
The sealing ratio pressure can be adjusted
When the valve is used for a period of time or loosened during transportation, it can be pressed to ensure the sealing requirements.
Sealing ring can be replaced on site
The rubber sealing ring is mounted on the butterfly plate and can be replaced in-line.
Long service life
The seal ring and the valve seat contact is anastomosis seal, there is no mechanical wear and extrusion, so the seal ring of double eccentric butterfly valve has a longer service life.
Suitable for large installations and pipelines in drainage, heating, and gas systems as well as chemical power generation and metallurgy industries.
Double eccentric design principle and features:
This butterfly valve is a double eccentric soft seal structure, i.e. the eccentric distance from the centre of rotation of the butterfly plate to the sealing section of the valve body a, and the distance from the centre of rotation of the butterfly plate to the centre line of the valve body b, (see figure below). This valve is decelerated by worm gear transmission (electric valve is decelerated by electric motor through worm gear transmission), and the butterfly plate is driven to rotate within 90℃ by the valve shaft, so that the butterfly plate is in the open or closed state to achieve the purpose of connecting or cutting off the medium.
As shown in the diagram, when the valve is closed, the sealing ring is extruded by the sealing surface of the valve body and the butterfly plate, resulting in deformation, so that the sealing force between the sealing surfaces of the valve gradually reaches its maximum value.
Features of double eccentric butterfly valve:
①With two-way sealing performance, especially suitable for media with both positive flow requirements and reverse flow requirements of the working conditions (need to be specified when ordering);
②Adopting double eccentric sealing structure, it has the function of getting tighter and tighter when closing, with reliable sealing performance;
③The butterfly plate adopts streamlined structure, high strength, large circulation area, and small flow resistance;
④Change the material of the valve body, the sealing ring is located on the butterfly plate, change the sealing ring material, which can be applied to different media;
⑤The worm wheel drive device is fully enclosed type, flexible operation;
⑥The electric device is an integrated product of the introduced type, which can be controlled locally or remotely, with safe and reliable control.
A double eccentric butterfly valve is a type of butterfly valve with a unique design that allows for a tighter seal and better performance in high-pressure and high-temperature applications. Some common applications of double eccentric butterfly valves include:
1. Oil and gas industry:
Double eccentric butterfly valves are commonly used in the oil and gas industry for regulating the flow of various fluids and gases, controlling pressure, and isolating different parts of the system.
2. Chemical processing:
Double eccentric butterfly valves are widely used in chemical processing industries for regulating the flow of various chemicals and fluids, controlling pressure, and isolating different parts of the system.
3. Power generation:
Double eccentric butterfly valves are used in power generation plants for regulating the flow of steam and gas, controlling pressure, and isolating different parts of the system.
4. Water treatment:
Double eccentric butterfly valves are used in water treatment plants for regulating the flow of water, controlling pressure, and isolating different parts of the system.
5. HVAC systems:
Double eccentric butterfly valves are also used in heating, ventilation, and air conditioning (HVAC) systems for regulating the flow of air and controlling temperature and humidity.
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