6. Metal surface treatment Metal surface treatment processes include plating, surface penetration, surface oxidation passivation, and the like. Its purpose is to improve the corrosion resistance of metals and improve the mechanical energy of metals. Surface treatments are widely used in the valve field. The valve connection screw is usually galvanized, chrome-plated, and oxidized (blue) to improve the resistance to atmospheric and medium corrosion. In addition to the above methods, other fasteners...
The corrosion prevention of metal valves - part two Read
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Electrochemical corrosion corrodes metals in various forms. It acts between the two metals. Moreover, due to the different solubility of the solution, the different solubility of oxygen, and the slight difference in the internal structure of the metal, a potential difference is also generated, which will increase the corrosion. Some metals are not corrosion-resistant, but they can produce a very good protective film, that is, a passivation film, which can prevent the corrosion of the medium. It...
The corrosion prevention of metal valves - part one Read
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Fully welded ball valve performance 1. No need for maintenance, adjustment and lubrication, easy to install, long-term reliable operation under low operating costs. The surface is spray-treated, and the gloss is beautiful. It is already at the leading level in China. There will be no external leakage. The valve body is welded, so the valve is light and easy to insulate. Installation of the adjustment mechanism is very simple; the operating handle can be removed and installed reversely. 2. Since...
Fully welded ball valve performance and its application range Read
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An all-welded ball valve is used in a wide variety of applications. It has superior quality and high performance stability that general cast steel ball valves cannot achieve. Its service life is far longer than cast steel ball valves. An all-welded ball valve is widely used in urban gas, urban heat supply, petrochemical industry, shipbuilding, steel, pressure regulating stations, power plants and other types of pipeline equipment. The all-welded ball valve can be used for reliable long-term operation,...
The structural features of an all-welded ball valve Read
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With Chinese long-term high-speed economic growth demand for energy, the people's requirements for the quality of life and the ecological environment are also increasing. Century projects such as the West-East Gas Transmission, Sichuan-to-East Gas Transmission, and the introduction of Russian natural gas show that natural gas, an important energy source with high quality, cleanness and environmental protection, is receiving unprecedented attention from the Chinese government. China Gas has established...
The difference between natural gas pipeline valve & ordinary valve Read
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At present, butterfly valves, as parts that control flow and pipe system, have been widely used in petroleum, chemical engineering, metallurgy, hydroelectricity, and other fields. Hermetic seal is the most-used known technique of butterfly valve seals, whose materials include rubber, PTFE, etc. But it is not suitable for processes that require corrosive, abrasive media, high temperature and pressure due to the restriction of its structure. Recently, there is a more advanced type of butterfly valves...
Butterfly valves are widely used in numerous fields Read
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Valve selection and setting parts ◆◆◆ Valves used for water supply pipes are generally selected according to the following principles. When the diameter of the pipe is smaller than 50mm, the globe valve should be used. When the pipe's diameter is larger than 50mm, the gate valve and butterfly valve should be adopted. When the flow and water pressure need to be adjusted, the regulating valve and globe valve should be selected. It is recommended using a gate valve for parts with low water flow...
Valves for drainage pipes Read
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A gate valve is one of the most common types of valves in isolation valves. A gate valve can be found in every refinery, chemical plant, power station and industrial enterprise production facility, and its sizes range from DN6 to 4200. The main purpose of selecting the gate valve is to cut off the fluid. It is for this reason that gate valves are often referred to as "cutoff" valves or "block" valves. Gate valves are generally used in fully open or fully closed operation. When...
The overview of a gate valve Read
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Magnetic valve A magnetic valve adopts the structure with the electrified magnetic coil. The magnetic valve can produce the magnetic force to overcome the pressure of the spring and let the valve core move. This kind of valve adopts the very simple structure. The magnetic valve is cheap but can only be fully opened and closed. The magnetic valve can be opened and closed to control the flow of the liquid or gas in the liquid and gas pipeline and operated with the dissolved oxygen control system....
The Differences between Electric Valves and Magnetic Valves Read
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Working principles of forged steel floating ball valves A floating ball valve adopts the structure with the floating ball supported by the valve seat. The valve ball can move by the pressure of media and then the outlet of the valve seat's sealing ring is sealed by the valve ball. A ball valve, according to the valve structure, can be classified as the one-piece ball valve and the split ball valve. When a floating ball valve is made of forged steel, it is called the forging steel...
Hard Sealed Forged Steel Floating Ball Valves Read
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