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The valve body, bonnet and wedge (disc) are the main parts of the valve, which directly bear the medium pressure. The materials used must comply with the provisions of "pressure and temperature rating of the valve". Common materials are as follows: 1. Grey Cast Iron Grey cast iron is suitable for water, steam, air, gas and oil media with nominal pressure PN ≤ 1.0MPa and temperature between -...
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After selecting a suitable valve, it is necessary to install, maintain and operate it correctly, so as to give full play to its efficiency. The quality of valve installation directly affects its use, so it must be paid attention to carefully. 1. Direction Many valves have directionality, such as globe valve, throttle valve, pressure relief valve, check valve, etc. If installed reversely, it will a...
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In the process of using the valve, we will encounter various working conditions, such as high temperature and low temperature. In this case, how should we choose the valve? 1. High Temperature Conditions When selecting valves, it is necessary to consider using shell materials and internals materials with high temperature strength, such as austenitic stainless steel valve and bidirectional sta...
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The working principle of the forged steel ball valve is to make the valve unblocked or blocked by rotating the valve stem. The ball valve is easy to switch, small in size, can be made into a large diameter, reliable in sealing, simple in structure, convenient in maintenance, and the sealing surface and spherical surface are often in a closed state, which is not easy to be eroded by the medium, and...
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The opening and closing part of the bellows seal globe valve is a plug-shaped disc, the sealing surface is flat or conical, and the disc moves linearly along the center line of the fluid. The movement form of the valve stem includes a lifting rod type and a lifting rotating rod type. The bellows seal globe valve is only suitable for full opening and full closing, and adjustment and throttling are ...
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With the rapid development of the economy and the increase of large-scale petrochemical engineering projects, more and more high-temperature hard-sealed ball valves are widely used in the fields of petroleum, chemical industry, steel, metallurgy and hydropower. Compared with soft-sealed ball valves, the sealing material and design structure of hard-sealed ball valves are better suitable for high-t...
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