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Metal seal butterfly valve means that both sides of the seal pair are made of metal material or other hard materials. The sealing performance is poor, but it is resistant to high temperature, abrasion and good mechanical properties. Such as: steel + steel; steel + copper; steel + graphite; steel + alloy steel. The steel here may also be cast iron, cast steel, alloy steel or alloys for surfacing an...
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(1) Soft sealing material A. Nitrile rubber (NBR). Nitrile rubber has excellent oil resistance; heat resistance is superior to natural rubber and styrene-butadiene rubber; air tightness and water resistance are better. Nitrile rubber can be divided into butyronitrile-18, butyronitrile-26 and butyronitrile-40. Nitrile rubber is suitable for petroleum products with a temperature of -60 ° C ~ +120 ° ...
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Before we select an appropriate ball valve, there are many factors we need to take into consideration. Seat type is one of important perspectives. Soft Seated Ball Valve The seat ring in contact with the ball part is made of soft material, such as PTFE, RPTFE, Nylon, Devlon, Peek and so on. For floating ball valve, there is only one soft seat ring for one side seat. But for trunnion ball valve, th...
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Most of ball valves own the sealant injection system. In this article, we will explain why ball valve is installed with sealant injection fittings. Generally speaking, each ball valve has two sealant injection fittings. One is located at the stem area and the other seat area, like the picture shown below. The sealant injection system of ball valve plays a part as the emergency sealing or backup se...
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The blow-out proof stem is one of basic design features of ball valve. Ball valve stem is inserted from the valve body inside with integral T-type shoulder to provide blow-out proof effectively. It is internally inserted as a function of backseat to assure stem sealing safety. To describe it in details, the stem is sealed by o-rings & packing rings, and held in position by the stem housing whi...
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Anti-static device is another basic and mandatory design for ball valve. During the operation of valve, the constant friction between ball and soft seat will generate static electricity. The spark caused by static electricity may ignite the inflammable fluid inside the valve and cause a potential fire hazard. To get rid of the hidden danger, an anti-static device is invented for ball valve. Like t...
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