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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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What is a ball valve? Ball Valve is the quarter-turn valve of which the opening and closing member (ball) is driven by the valve stem and rotates around the axis of the ball valve. What are the ball valve types? In terms of valve structure, we have floating ball valve and trunnion-mounted ball valve. The ball inside the floating ball valve is free to float. In contrast, the trunnion ball is fixed ...
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In terms of valve structure, we could divide ball valve into floating ball valve and trunnion-mounted ball valve. The working principle for floating ball valve: The ball inside the valve body is floating, since it does not have lower stem to fix and support the ball. Under medium pressure, the medium pushes the ball, and the ball can generate a certain displacement and press on the sealing surface...
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In terms of types of bores, ball valves could be divided into full port ball valves and reduced port ball valve. In this article, we will discuss the main differences between them. Full Port Ball Valve A full port ball valve, also known as a full bore ball valve, has the same internal bore size as the nominal pipe size. For example, a 2-inch full port ball valve has a 2-inch valve opening inside t...
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We have many ways to classify ball valves. When it comes to the body style, ball valves can often be divided into side entry ball valve, top entry ball valve and fully welded ball valve. In this article, we will discuss about the differences among these three types. Side entry ball valves are the most common type we use in different industries. The valve is assembled from sides through bolts and n...
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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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