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What are the main differences between Shanghai gate valves and fluorine-lined butterfly valves?

Time: 2015-09-24Source : Shanghai Nuoyou Valve Industry Co., Ltd.

Among the types of sealing materials for valves, there are many types of pneumatic valve products, but there are many types of sealing materials in their products. Generally speaking, they can be divided into hard seals and soft seals. Divided into a variety of seals, such as alloy steel seals, copper alloy seals, etc. are hard seals, while fluorine-lined, rubber, rubber-lined, plastic, etc. are all in the soft seal category. The definition and type of two seals are introduced. Fluorine-lined butterfly valves are used to control non-corrosive or general corrosive and highly corrosive media. The inner surface of the valve body is not lined or covered with a variety of optional rubbers, which is suitable for various working temperatures and fluid pipelines.
  
Fluorine-lined butterfly valves, also known as fluoroplastic-lined corrosion-resistant valves, are processed by placing polytetrafluoroethylene resin or profiles on the inner wall of steel or iron valve pressure parts by molding or inlaying. The same method is suitable for various pressures. The inner surface of the container and pipeline accessories or the outer surface of the valve's internal parts are made of various types of valves by using their unique properties in anti-corrosive media. When the gate valve is closed, the sealing surface can be sealed only by the medium pressure, that is, the sealing surface of the gate is pressed against the valve seat on the other side only by the medium pressure to ensure the sealing of the sealing surface, which is self-sealing. Most gate valves are forcibly sealed, that is, when the valve is closed, the gate is forced to be pressed against the valve seat by external force to ensure the tightness of the sealing surface.

Working principle of manual gate valve: Turn the handwheel to advance or retreat the thread of the handwheel and the valve stem, and lift or lower the valve plate connected to the valve stem to achieve the function of opening and closing.
Gate valve has low flow resistance. The medium channel inside the valve body is straight through, the medium flows in a straight line, and the flow resistance is small. Gate valve saves effort when opening and closing. Compared with the shut-off valve, whether it is open or closed, the direction of movement of the shutter is perpendicular to the direction of medium flow.
(Responsible editor: ISF)
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