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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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1. Hazards (1) Damage to the valve itself The strength of valve shell, bonnet and stem parts is generally designed according to the nominal pressure of the valve. In case of abnormal pressure rise, the opening pressure will be doubled, resulting in the service stress of relevant parts to be doubled. When the actual stress of the material exceeds the allowable stress, the high stress part wil...
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According to the structure of the valve stem, the gate valve can be divided into Rising Stem Gate Valve and Non Rising Stem Gate Valve. 1. Rising Stem Gate Valve: The valve stem nut is on the bonnet or bracket. When opening and closing the wedge, you can rotate the valve rod nut to realize the lifting and lowering of the valve rod. This structure is beneficial to the lubrication of the valve rod, ...
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Soft seal and hard seal are judged according to the sealing material of the valve seat. Soft seal: one side of the sealing pair is made of metal material, and the other side is made of elastic non-metallic material. This seal has good sealing performance, but it is not resistant to high temperature and abrasion, and has poor mechanical property. Hard seal: both sides of the sealing pair ...
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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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