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Metal seated butterfly valve is that both sides of the seal are made of metal material or other hard materials. This seal has relatively poor sealing performance, but is resistant to high temperatures, abrasion and mechanical properties. Metal seated is often combined of such as: steel + steel, steel + copper, steel + graphite, steel + alloy steel. The steel here may also be cast iron, c...
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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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The plug valve is a quick opening and closing valve. Plug valves are suitable for multi-channel structures, so one valve can obtain two, three or even four different flow channels. This can simplify the design of the pipeline system, reduce the amount of valves and connecting fittings. Plug valves can be divided into soft seal and hard seal structures according to different sealing materials. 1. L...
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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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