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The problem of valve standardization in my country still exists

by:Sino Valves     2021-11-07
my country's valve standardization work has made great progress since the reform and opening up. It has made certain achievements in terms of supplementing and improving product standards or adopting international standards (ISO/TC153) and foreign advanced standards. There has been a large increase in the number of valve standards and a certain improvement in the level. But there are also many problems in valve standardization.  1 Problems in current valve standards   1.1 Valve inspection and acceptance standards are not uniform    Valves, as a 'throat' product on the pipeline, should have a unified, high-level standard for inspection and acceptance, which is the standard that most valve users are most concerned about. In fact, the current provisions on valve acceptance inspection are not fully required in product standards, and as independent valve inspection and acceptance standards, they are not uniform. They are GB4981-85 'Pressure Test of Industrial Valves' and GB/T13927-92. General Valve Pressure TestHowever, the content of these three inspection and acceptance standards is not the same, and the descriptions of the inspection items, inspection methods, and quality indicators of the valve are not completely consistent. As a result, valve users are not sure which standard should be used as the basis for inspection and acceptance of purchased valves. Sometimes, it also caused unnecessary conflicts between users' internal functional departments in the valve inspection warehouse and requisition of products. The valve manufacturers also have different opinions. Some manufacturers say that the GB4981 standard has been invalidated and GB/T13927 should be adopted; some manufacturers say that the level of GB/T13927 is not high, but it is only a recommended standard, and they themselves use ZBJ16006; and Other manufacturers think that ZBJ16006 is the internal professional standard of the valve industry, and the national standard GB4981 should be adopted, which makes users confused. The author believes that the inspection and acceptance standard for industrial valves should be a unified, complete, and only interpretation standard, and its text should be based on the national standard GB to meet the needs of various industrial departments for supporting selection. It should not be a few standards like the current ones. Coexistence, each has its own standard number, and each has different content requirements, so as to avoid the phenomenon that manufacturers take what they need and how to explain how their products are beneficial.  1.2 Issues related to standard revisions   As we all know, it is normal to modify, improve, and improve the content of the standard. The author believes that the revised standard should continue to use the original standard number, and only need to change the year number of the standard. For example, GB4981-85 was revised to GB4981-90, GB4981-95, and there is no need to abolish GB4981 and use the new GB/T13927 number. This not only makes the original standard number empty, but also adds a new number.   Someone may explain that this is to absorb and adopt advanced foreign standards. However, the author believes that it is completely correct and appropriate to actively adopt international standards and foreign advanced standards when formulating and revising standards. The problem is to analyze and compare, learn from their strong points, and form their own system. Make their own standards diversified, chaotic routines, and become a mixture of foreign standards. The standards of foreign industrialized countries are often revised, but the system will not be messed up. For example, the API598 'Valve Test and Inspection' standard of the American Petroleum Institute has developed into the seventh edition of API598-96 after several revisions in 20 years, but the standard number is always API598, but the year number and version are changed accordingly. It's not like we made a new name after the revision, which made people unable to distinguish the development trajectory of the old and new standards. The German valve supply standard DIN3230 adopts the method of dividing the semicolon under the standard number. For example, DIN3230-Pt1 supply technical conditions, Pt2 supply general requirements, Pt3 test collection, Pt4 water supply valve test, Pt5 gas valve test, etc., this number gives people a clear sense of order and is worthy of our reference.  1.3 The valve standard does not match the flange standard   When purchasing a valve, the user not only cares about the quality of the valve itself, but also cares about the size matching of the valve and the pipeline connection installation. But at present there are various standards for valve flanges. The flange standards of the Machinery Department include JB78, JB79, JB/T791, JB/T80, JB/T81, etc.; the flange standards of other departments include HGJ44, SH3406, HG20592, etc.; there are also national standards. Steel and iron flange standards GB4216, GB9113, etc. The dimensions of these standards are not the same. The flanges of the same steel and the same pressure specification have either the outer circle size difference of 5mm, or the flange thickness difference of 1~2mm. The simplest and most commonly used raised face flanges (RF) have different raised face step diameters. Uniform, the difference is always 2~3mm, this situation brings great trouble to users. Often the selected valves are sent to the construction site and found that some of the flanges are a few millimeters larger and some are smaller; some stud holes are 1 to 2 millimeters larger, and some screw holes are as big as bolts, making it difficult to wear Go in, even the outer circle of the flange boss gasket that needs to cut the asbestos sheet is large or small, with a difference of 1~2mm. Valves of the same specification use different flange standards due to different manufacturers, and it is really unnecessary, unreasonable and non-advanced, to cause small dimensional changes in flanges.  1.4 Valve structure length is not uniform.     In addition to the chaotic size standards of the connecting flange itself, the size between the flange surfaces at both ends-the structure length is also divided into long, medium and short series.
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