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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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Soft seal gate valves are usually used as industrial valves. The deformation compensation function is generated by the overall rubber coating of the gate, which achieves good sealing effect, overcomes the problems of poor sealing, water leakage and rust of general gate valves, saves installation space more effectively. Advantages of Soft Seal Gate Valve: (1) Low fluid resistance The medium c...
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Today, Dervos takes you to know which components of soft seal gate valve are prone to leakage and how to prevent and remedy it well. 1.Leakage at Gate Valve Connection First, we should check whether the connecting bolts between gate valves are tightened, ensure that the sealing gasket ring in it is fully combined with the flange sealing groove surface. Secondly, if leakage has occurred, please do ...
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Valves are control components in fluid transfer systems, with a variety of different functions such as stopping, regulating, diverting, preventing backflow, stabilizing pressure or overflowing pressure relief. Therefore, it can be used in many fields and has a wide range of uses. It can be used to control the flow of various types of fluids such as air, water, steam, various corrosive media, slurr...
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Gate valves are available with a variety of disks. Classification of gate valves is usually made by the type disk used:Wedge type single gate valve,Resilient gate valve,Double gate type gate valve, or Parallel gate valve. 1)Wedge type single gate valve ①Simpler structure than resilient gate valve. (ii) At higher temperatures, the sealing performance is not as good as that of resilient gate valves ...
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As we all know that the valve body like carbon steel (WCB, WCC, LCB, LF2, A105), stainless steel (SS304, SS316, F304L, F316L), hastelloy (Alloy 20) etc., or even in the trim material always use metallic materials. Most of the corrosion of metallic materials occurs in the atmosphere, which contains corrosive components and corrosive factors such as oxygen, humidity, temperature changes and pollutan...
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Notes before installation Before installation, check carefully whether the valve’s model, designed pressure and caliber meet the requirements. Make sure the arrowmark on the valve point at the flow direction of the pipe medium. Before installation, make sure the chamber and sealing surface are clean, check the sealing surface, bolt connection, packing compression, stem rotation, etc. The...
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Rubber seals are widely used in the valve sealing, for their excellent properties such as waterproof, flame retardant, high temperature resistance, electrical conductivity, wear resistance and oil resistance. Rubber seals, as indispensable fittings for seal valves such as forged bellow seal valves, also meet EU environmental protection standards. Four main reasons for the ...
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As winter approaches, the temperature gradually drops and the valves outsides are getting greater chance tobe froze. At this time, the pipeline will easily fail if not take some acts. And when it comes to some high-risk working conditions, accidents may also occur. Therefore, the anti-freezing treatment of valves is crucial to industrial equipment. Before th...
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What is valve corrosion? Corrosion of valves is usually understood as the damage to the metal materials of the valve caused by the chemical or electrochemical environment. Since the corrosion appears in the spontaneous interaction between the metal and the surrounding environment, the focus of corrosion prevention is how to isolate the metal from the surrounding environment or more use of non...
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