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    Home > Active Ingredient News > Drugs Articles > Analysis and treatment of leakage of control valve

    Analysis and treatment of leakage of control valve

    • Last Update: 2014-10-22
    • Source: Internet
    • Author: User
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    Causes and Countermeasures of valve body leakage the valve body itself of the control valve is mostly cast, which is easy to produce sand holes in the casting process These sand holes may cause the medium leakage of the control valve Such leakage can be found out by hydraulic test By optimizing the design and manufacturing process of the control valve, the problem of valve body leakage can be effectively solved The reasons and Countermeasures of stem leakage are mostly caused by the lack of material strength, which makes the stem easy to get stuck in some place, and then the valve is not closed tightly, so the medium can leak from it In order to solve the valve stem leakage, the material with better toughness and corrosion resistance and wear resistance should be selected Therefore, the AUSTENITIC FERRITIC duplex stainless steel with strong crack corrosion resistance can be selected The reasons and Countermeasures of stuffing box leakage the stuffing box mainly consists of the following parts: stuffing box, packing and packing pad The stuffing box is used to fill the packing and is usually placed on the valve body Packing pads are used to support the packing and are usually placed at the bottom of the stuffing box The traditional packing mostly uses soft packing, and its sealing stress mainly depends on the axial force of the gland, which undoubtedly increases the friction between the stem and the packing, and over time, it is easy to reduce the sealing effect In order to effectively solve the problem of stuffing box leakage, the formed packing can be replaced by soft packing, which has better elasticity and compact structure, so it has better sealing performance At present, the widely used formed packing is flexible graphite ring packing Causes and Countermeasures of leakage at the valve body connection: the valve body connection mainly refers to the part between the valve body and the valve cover, and its sealing is mainly realized through the flange The leakage at the valve body connection is mainly caused by the flange sealing surface does not meet the standard, the gasket size or material does not meet the requirements, the connecting bolts are not tightened and other reasons In order to effectively solve the problem of leakage at the connection part of valve body, birch groove flat gasket, O-ring or concave convex flat gasket can be used for sealing The Zen groove type refers to placing the flat gasket in the closed groove, which has high specific pressure and is generally used for medium and high pressure regulating valves The "O" ring can produce larger radial pressure without axial loading It is mostly used for sealing flange connection, which can effectively reduce the flange size, and then reduce the self weight of regulating valve Concave convex type means that the flat gasket is placed on the concave convex flange, because the sealing groove is stepped, it is helpful for the disassembly and assembly of the regulating valve As an important factor affecting the performance of the control valve, whether the leakage can meet the application standards is particularly important Therefore, it is necessary for the relevant personnel in the industry to have a certain grasp of the determination method of the leakage amount of the control valve And for the regulator manufacturers, if we can analyze the leakage reasons of the regulator on the basis of the test, and put forward the corresponding countermeasures, it is very helpful to improve the performance of their own products  
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