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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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Soft seal gate valve is a common industrial valve. The opening and closing part of soft seal gate valve is a wedge. The direction of movement of the wedge is perpendicular to the direction of the fluid. The gate valve can only be fully opened and fully closed, and cannot be adjusted or throttled. When manufacturing soft seal gate valves in batch, the following performance tests should be carried o...
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The opening and closing part of the gate valve is the wedge, and the movement direction of the wedge is perpendicular to the direction of the fluid. The gate valve can only be fully opened and fully closed, and is not suitable for adjustment and throttling. Most gate valves are forcibly sealed, that is, when the valve is closed, the wedge must be forced against the valve seat by external force to ...
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The flat gate valve is characterized by small flow resistance. Since the wedge slides on two valve seat surfaces, the flat gate valve is also suitable for fluids with suspended particles. Double block discharge function: When the valve is opened or closed, the medium from upstream and downstream will not leak from the valve cavity, which is convenient for the cavity discharge and leak detection. F...
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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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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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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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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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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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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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