质邦阀门-专业生产加工、定做各种船用阀门和附件

1, China's valve ship standard analysis, since 1965, China promulgated the first batch of national standards for marine valves, after several generations of efforts, China has ships, pipelines, valves, ship standards 171. Among them, the national standard GB/T37, shipbuilding industry standards CB, CB, CB/T99, ship foreign trade standard CBM35. The number of valves is 2713. These standard valves have basically covered all kinds of ship's piping systems and made great contribution to the development of shipbuilding industry in china. However, the technology is always evolving, China's valve standards should also be continuous innovation and development. Valve standards for innovation and development, not only do we need to try to understand more about the world trend of valve development, developed new varieties of valves, we also need to update the old product transformation efforts. The rapid development of shipbuilding situation shows the serious lag of the development speed of the main supporting products of the ship. The foregoing specifications of nearly 2000 varieties of valves, if coupled with the national shipyards, valve manufacturers to draw their own dedicated maps, factory general plans and enterprise standards, China's ship valve specifications to reach more than 3000 species. Specification is marine valve characteristics but also hinder marine valve technology to improve the key reason. Draw the organization of specialized production control valves, marine valves to improve product quality in domestic shipbuilding market share has brought a series of difficulties the varieties and specifications of large preparation, for the valve standard construction drawings. If we focus only on the development of new products,

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 it will be difficult to adapt to the rapid development of the shipbuilding situation without the renovation of the old standard products. Over the years, the technical committee of standardization of ship machinery was attached to the technical committee, and members of the technical committee of the sub Commission made many revisions to the old standards. But most of the amendment is limited to "piecemeal" did not fundamentally solve the problem of China's marine valve varieties, specifications of the complex problem. China is currently engaged in the production of marine valves professional manufacturers have more than 50. Among the 300 employees, there are 45 small factories with more than 3040 others. Under the market economy lever manipulation, the product variety is miscellaneous, the basic shape is not batch. The vast majority of valve factory in the "keep going by painstaking effort". Due to the rising prices of raw materials in the shipyards are finding ways to reduce costs of the valve market in a "go" situation of the valve products in the increasingly high quality requirements the sales price is not up. Many valve factory are trying to find ways to reduce costs, coupled with the production of valve equipment, tooling backward, making the quality of marine valves is very unstable. I have personally seen a valve factory will know that the casting defects of the valve embryo processing into finished products, but also in some valve manufacturers to see low-cost materials instead of high cost materials phenomenon. The present situation of shipbuilding industry is that the tonnage, variety and quantity of shipbuilding in our country are increasing rapidly, but the quality of marine valves is worrying. The quality problems of ship valves affect the speed of ship delivery. Navy has commissioned the Hefei General Machinery Research Institute has made a "ship general valve research" research reports. The report says that "valve product standards have restricted marine valve technology and the level of progress and improvement of domestic marine valve in 60s is still the product structure there are different degrees of leakage phenomenon". Although its conclusion is arbitrary, the cut point is somewhat farfetched, but the quality of marine valves is unstable, which is an indisputable fact. 2 powerful means to improve marine valve quality is to expand marine valve parts general what range of steadily improving marine valve quality in 1970s authorities had adopted by region will be many varieties of valves are classified by the sentinel professional factory production of the valve factory deployed experienced inspectors inspection method is then used to grading the quality of the valve quality control.

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This approach is out of the question now. Quality is the life of enterprises, most of the marine valve factory know this truth. But the product shape is not batch, but it restricts the development of valve production technology. In the industrial product which is not because of the mass production of CNC automation can do I think the best measures for improving the quality of the valve and the economic benefit is the expansion of marine valve valve parts, general varieties range compression ship imagine. To expand the scope of marine valve parts and components, compressed marine valve varieties, it is necessary to ship valves standard major operations. For example, some domestic shipyards in the layout of the ship piping, the pressure level is not greater than 1.0MPa flanges, including 0.25MPa, 0.6MPa, 1.0MPa pressure level, unified use of 1.0MPa pressure level flange. It looks like some waste actually 1.0MPa stage pressure ratio 0.25MPa, 0.6MPa grade pressure flange flange size was large, but some heavier flanges in the whole ship by weight ratio is very little. The economic benefits are enormous. From the piping design, equipment ordering, organization production, warehousing, pipe welding, installation benefits, greatly improve the quality of shipbuilding and construction speed. Which extends to the valve we think there are some marine valves can be the merger of similar items. For example GB/T584-1999 "marine flanged cast steel globe valve" this standard provides 1.0MPa, 1.6MPa, 2.5MPa, 4.0MPa, 6.4MPa five pressure level caliber series for DN20DN300 plus divided into two types with the same caliber might have 56 sizes. On a ship, GB/T584 is the most widely used of a valve, but a model, caliber valves on a ship, at most only a few