Selection and application of eccentric butterfly valve

Eccentric butterfly valve and other butterfly valves have outstanding advantages, so they are widely used in all aspects of life and work to meet various requirements. And with the continuous development of eccentric sealing butterfly valve technology, it is used more and more widely.

Application of double eccentric sealing butterfly valve

The double eccentric sealing butterfly valve adopts the eccentric structure design. The main structure of the valve is composed of valve body, butterfly plate, valve seat, valve rod and transmission mechanism. The valve seat adopts the detachable structure. According to the physical and chemical media characteristics of different media, the corresponding corrosion-resistant, light resistant and aging resistant materials can be selected. It can be widely used in water supply and drainage, sewage, construction, air conditioning, oil, chemical industry Industrial, food, medicine, textile, paper, hydropower, ship, metallurgy, energy system and other fluid pipelines are used as regulating and intercepting devices. The double eccentric butterfly valve usually uses tetrafluoroethylene as its sealing valve seat, and can also use metal sealing valve seat to expand its application in high temperature field. However, the sealing of the double eccentric butterfly valve with metal sealing seat still belongs to the position sealing structure, that is, the sealing surface of the butterfly plate and the valve seat is in line contact, so it can not withstand high pressure, which will inevitably lead to a large amount of leakage when applied in the high-pressure system, so the double eccentric butterfly valve with metal sealing seat should be avoided as far as possible in the high-pressure system or the system requiring strict cut-off.

Application of triple eccentric sealing butterfly valve

As the crystallization of the latest technology of the valve, the three eccentric butterfly valve has attracted more and more attention of users and designers. The maximum pressure rating can reach 2500 pounds, and the standard caliber can reach 48 inches. Moreover, the length of clamps, lugs, flanges, ring joints, butt welding, jackets, and various structures can be matched. Due to the wide choice of materials, the corrosive media such as high and low temperature, acid and alkali can also be matched freely. Especially in the aspect of large caliber, with the advantage of zero leakage, in the shut-off valve, it is constantly replacing the coarse gate valve and ball valve. Similarly, with its excellent control function, it is also constantly replacing the bulky stop valve in the control valve. Up to now, the three eccentric butterfly valve has been used in various important pipelines including China’s oil and gas exploitation, offshore platforms, petroleum refining, petrochemical, inorganic chemical, energy power generation and other industrial fields. In the actual project, if the working pressure of the system is not less than 1.0 MPa or in the important parts that need to be opened frequently, triple eccentric butterfly valve can be selected.

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