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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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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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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 biggest difference between the ball valve and the butterfly valve is that the opening and closing parts of the butterfly valve are a plate, while the ball valve is a ball. Characteristics of Butterfly Valve: 1. Simple structure, low consumption and low cost, but poor tightness and bearing capacity; 2. Quick opening and closing, small flow resistance; 3. It is suitable for making large diameter...
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At present, the gate valves on the market have a general sealing performance, and the phenomenon of water leakage and rust is common. The soft seal gate valve overcomes this disadvantage. The soft seal gate valve achieves a good sealing effect by making use of the compensation function of the elastic wedge to produce a small amount of elastic deformation. Common Sense of Installation and Maintenan...
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