If domestic regulator design level, production level has certain gap compared with advanced foreign country are real, but if have the very big difference, it is not conform to the actual. Why, then, the use effect of domestic regulator and time far less than the introduction of the product? As long as the compare our country's regulator selection table with foreign calculation selection table, it is not hard to find, our content is too simple. Such as listed in the instrument society of America standard format content 49 serial number, form less than 20 number in China, many are not included in the content, inevitably improper selection, not comprehensive, cause 'congenitally deficient'; And domestic valve standardization degree is high, with one change should change, rather than 'suit the remedy to the case', be treated differently. Only in valve leakage, for example, the user reflect more strongly. It not only involves the structure of the selected. Also involves the unbalanced force is calculated. Who is going to careful consideration? No. Since no, closed tightly, can't open, large leakage, the reliability of the seal ( How long can start, with less than not) Such as use problem. To solve it, must be careful consideration, it includes: ( 1) According to the closing of the valve pressure difference, calculation of unbalanced force, to determine the structure and the actuator size, first ensure that shut up need enough output force. ( 2) To determine the best flow for the seal. ( 3) The structure of the Industrial Valves, for large differential pressure, large diameter valves ( As the DN100 valve, delta P = 20 mpa, the imbalance thrust up to Ft = 0. 25个π×102×20 = 15。 7t) , the careful consideration of the structure is very important, including the force balance and cavitation and erosion resistant. ( 4) Not clean medium, scaling stammer medium to collect performance considerations, blocked, stuck, how can seal? ( 5) Throttling the strong corrosive medium, the corrosion resistance of consideration, and will be reliable, run many valve leakage soon, because corrosion on the throttle. ( 6) Considering the sealed type. 一个。 Hard seal or soft seal; b。 Whether to need to welding wear-resistant alloy, improve reliability; c。 Soft seal and soft seal material. ( 7) Leakage level, test method, test pressure difference and acceptance method and so on. Thus, rough, must obtain the use effect of the rough: most of the products can be commonly, so consider owe when and special occasions, slightly bad valve must be used. Sum up, the main problems of the application of domestic regulator is: calculation and selection is not comprehensive, cause 'congenitally deficient'; The manufacturer of the product is too single, cannot satisfy the various needs. The solution is: first, grasp the quality of the first level ( And factories do not take off) Sign a contract, review the selected valve can effectively meet the real working conditions and use requirement, overcome 'congenitally deficient'; Followed by the factory production of various products, especially the special products, variant products to adapt to the demand of special occasions. To do these two points, regardless of the selection of personnel and the manufacturer must be proficient in application of regulating valve.
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