Double eccentric butterfly valve is mainly composed of valve body, valve seat, butterfly plate, transmission device and other parts. The valve body is usually composed of two half shells, separated by the valve seat in the middle. The butterfly plate is placed in the middle of the valve seat and connected to the valve stem with the help of the transmission device.
Due to the double eccentric structure, the butterfly plate can achieve a larger opening angle within a smaller angle range. As the opening angle of the butterfly plate increases, the valve channel gradually expands, allowing the fluid to flow through the valve.
In this process, the double eccentric structure minimizes the friction between the butterfly plate and the valve seat, and the resistance of the fluid passing through this type valve is also reduced accordingly.
By replacing the materials of valve plate sealing ring, butterfly plate, rotating shaft, etc., it can be applied to a variety of media and different temperature environments, enhancing the versatility and adaptability of the valve.
Standards:
▪ 100% tested to EN 12266-1
▪ Confirm to EN593 resilient seated
▪ Flanges to EN-1092/2, BS4504
▪ EPDM disc seat ring to EN 681-1
▪ Face to face: EN558-1, series 13/14
▪The general butterfly valve has the disadvantage of lax sealing. In order to make up for this shortcoming, With the development of technology, the double eccentric butterfly valve came into being. The stem axis of the double eccentric butterfly valve is deviated from both the center of the butterfly plate and the center of the body.
After the valve is opened, the butterfly plate can quickly separate from the valve seat, greatly eliminating unnecessary excessive extrusion between the butterfly plate and the valve seat, reducing the Increases opening resistance, reduces wear, and increases valve seat life.
▪The double eccentric butterfly valve adopts metal to metal seal, which further improves its high temperature resistance, high pressure resistance and corrosion resistance. It has a wide range of applications,
such as petroleum, steam, paper pulp, chemicals, oxygen, ethylene, etc.
▪Low maintenance. Double eccentric butterfly valve require minimal maintenance due to their durable construction and metal-to-metal seal, resulting in lower maintenance costs and reduced downtime.
▪Easy to operate and long service life. The control components such as the handle, gear and electric device of the double eccentric butterfly valve are all on the top of the valve, making it convenient for the operator to operate. In addition, the valve stem is connected to control components such as handles, gears and electric devices. This integrated structure can increase the service life of the valve and reduce maintenance costs.
