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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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There are many ways to classify plug valves. In this article, we will introduce four main type of plug valves. 1. Lubricated Plug Valve A lubricated plug valve functions with the help of a lubricant (a base oil and viscosity improver) which is injected between the plug and body seat facing to reduce the frictions between them. The lubricated plug valve must be resealed after a few cycles. Due to i...
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An axial flow silent check valve’s disc is held in place by a spring. This upgraded structure design brings about many advantages. First, as its name indicates, the streamlined axial flow path through full-port expanded body prevent turbulence, erosion and vibration, which eliminate the process downtime and maintenance cost. Second, the full port passage and high-pressure recovery of the venturi-s...
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1. What is the difference between Cast iron and Cast steel? The difference between Cast iron and Cast steel is their carbon content. Cast Iron with carbon content greater than 2.06% is iron; steel with carbon content between 0.02% and 2.06% is steel. 2. What is carbon steel? How many categories does it fall into? An alloy of carbon and iron (when the carbon content is between 0.02% and 2.06%) is c...
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If the medium remained in the cavity after the cryogenic gate valve is closed, the residue will gradually absorb the heat in the air and re-gasify. After the gasification, it will expand violently up to 600 times and generate extremely high pressure on the valve, which is called 'abnormal boost'. When the unusual occurrence happens, the wedge will be pressed firmly onto the seat and can’t be opene...
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Bronze and brass are two of the most common materials used to produce valves. This preference comes because both metals are quite malleable. They both are artificially made from natural metallurgical elements: brass is made from copper and zinc, while another is made primarily from copper and tin. Each metal offers valves numerous and various advantages...
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