Leakage of valves under different conditions

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Sandhole leakage 1. Casting defects, including pores, inclusions, and loose structure. Strictly adhere to process and operational protocols, and add anti-aging agents on time, in the correct quantities, and of proper quality. It has a complete quality assurance system, and the products leaving the factory meet quality standards. 2. There are forging defects such as inclusions and folds. Valves should be selected based on the operating conditions, taking into account the interrelationships between pressure, temperature, and the medium, while leaving some margin. 3. Injection molding defects include porosity, slag inclusions, cold shuts, and lack of material in certain areas. Depending on the various properties of plastic and rubber valves, measures must be taken to protect them from heat, freezing, sunlight, and dust. 4. Welding defects include porosity, slag inclusions, under-welding, etc. Valves should be maintained on a periodic basis; those that show signs of aging or have reached the end of their useful life should be replaced promptly. Reasons for aging and leakage include poor manufacturing quality, as well as inadequate durability of plastics and rubbers. It is essential to adhere strictly to manufacturing processes and operating procedures, and to add anti-aging agents in the correct quantities and at the right times. 1. A complete quality assurance system is lacking; the products leaving the factory do not meet quality standards. 2. Improper selection of valves that do not suit the operating conditions – valves should be chosen based on those conditions, taking into account the interactions between pressure, temperature, and the medium involved, and leaving some margin for flexibility. 3. Inadequate measures to prevent aging – depending on the properties of plastic and rubber valves, it is necessary to take measures to protect them from heat, freezing, sunlight, and dust. 4. Inadequate maintenance and delayed replacements – valves should be maintained on a regular basis; those that show signs of aging or have reached the end of their useful life should be replaced promptly. Corrosion and leakage: 1. Poor manufacturing quality, with issues such as slag inclusion, uneven structure, or material that does not meet design requirements – it is essential to adhere strictly to manufacturing and operational procedures, and to have a comprehensive quality assurance system to ensure that products meet quality standards. Spectral analysis and testing of valves may be necessary when required. 2. Welding defects, including slag inclusion, structural damage, or a weld material that does not match the base material, resulting in poor resistance to the medium – welding procedures must be followed strictly, and there should be quality assurance measures along with a proper quality inspection system. Samples of the welds on important valves should be taken for testing, and information regarding the welders who performed the welding work should be kept on record for easy reference. 3. Improper selection of valves – Valves must be selected based on their resistance to corrosion by the medium in question, as well as other conditions such as temperature related to corrosion. 4. Inadequate corrosion protection – Various corrosion prevention measures should be employed, taking into account the corrosive properties of the medium and the relevant operating conditions. Such as valve coatings, platings, penetration layers, electrode protection, and the addition of corrosion inhibitors to the medium. 5. Inadequate maintenance: Maintenance should be carried out on a regular basis and in accordance with technical requirements; valves that are severely corroded or have reached their service life should be replaced promptly