What does DIN 0 7043 GGG 40 3 mean about butterfly valves? What is EN 12226 1?

Here are some of the well-known brands recognized in the valve industry, which are widely recognized and have a high reputation. While rankings may vary depending on time and market conditions, the following brands are generally considered to be among the top brands in the valve industry:

The following influential first-line brands of water system valves and industrial valves can be used as a reference, but for reference only: Suzhou Neway Valve, Shanghai Guanlong Valve, Shanghai Qizhong Valve, Sanhua, Su Yan, Shentong, Su Valve, Nanfang, Jiang.

First, the word Yao. The above manufacturers are only estimates and references, and the specific situation may vary or fluctuate at any time due to changes in a series of factors such as changes in the market, the size of the competition pattern, and the stability of product quality. As an indispensable key device in industrial production and civil facilities, the quality and reputation of the valve brand directly affect the satisfaction and trust of users.

These brands are known in the valve industry for their innovative technology, high-quality products and reliability. It is important to note that the market and industry are evolving rapidly, and different rankings may vary depending on time and region. For the most up-to-date ranking information, it is recommended to refer to industry reports, professional organizations or market research data for more detailed and accurate information.

First of all, these three codes are all German national standards, DIN is a standard formulated by Germany itself, and no standards of other associations are adopted, DIN EN adopts the European standard (EN), and DIN EN ISO adopts the European standard and the International Organization for Standardization (ISO) at the same time.

No. Added:

din en means that this standard was originally a German national standard, and en means that this en standard is based on the British national standard.

One is an international standards organization, and the other is a regional and urban standards organization (some countries in Zhengzhou). Just like China's national standards and local standards, one is implemented by the enterprise and the other is implemented within the province.

It's just that the impact of IEC and EN is relatively large. Many countries will consider the adoption of preferential or even equivalent when formulating standards and exports. However, IEC and EN are both recommended standards, not tensile standards.

International practice, mandatory 4 regulations, directives, etc. (generally product standards, or related to health 4, safety, health, etc.).Foreign standards are all for the regulations, directives to serve, support. Unlike China, the regulations are administrative, and there are few technical regulations, and the technical regulations are based on mandatory standards.

The reason why the two give people a similar impression is that they, including ISOs, often refer to each other and transform each other. As we say, the ancient is for the present, and the foreign is for the Chinese.

In fact, international and regional standards organizations will adopt it if they think that other countries will promote it well. For example, the 1s09000 of the famous hot ding is deeper than the military product protection standard Ya MIL-Q-9858

The reason why international standards and regional standards are often adopted by each other is that as cross-cutting standards, they must fully consider their usefulness and the interests of Indian member states (which are also the requirements of the WTO) when formulating standards.

Therefore, the inter-governmental standard is not necessarily the most advanced. The two directives of the European type, which are in the limelight near the city, have formulated a schedule in order to ensure that the system is accurate and fully consider the interests of the member states. However, many Member States were also unable to implement it on time.

DIN EN means that this standard was originally a German national standard, and there is also a BS EN that says that this EN standard adopts the British national standard... There is no difference in content, just a brand, showing the ** of this standard.

It's the same standard.,Don't look at the prefix in front.,Just look at the en287-1 in the back.,But the original one is English and the other is German.。 is the same standard, and the EC often shares a standard

Nodular cast iron.

DIN German Label No.

It is equivalent to the domestic QT400-15

Ductile iron DIN German grade is equivalent to QT400-15 in China

With its excellent performance, it can sometimes replace expensive cast steel and forged steel in use, and is widely used in the machinery manufacturing industry. The international metallurgical industry used to believe that ductile iron was invented by the British in 1947. Some Western scholars even claim that without modern scientific and technological means, the invention of ductile iron is unthinkable.

In 1981, China's ductile iron experts used modern scientific means to study 513 pieces of ancient Han and Wei iron artifacts unearthed, and concluded that spherical graphite cast iron appeared in China in the Han Dynasty through a large number of data. The relevant ** was read at the 18th World Congress on the History of Science and Technology, which caused a sensation in the international foundry community and the history of science and technology. In 1987, international experts in the history of metallurgy verified this and concluded that:

Ancient China has explored the law of using cast iron softening to make ductile iron, which is of great significance for the re-periodization of the world's metallurgical history.

In 1959, the four major automobile manufacturers of France, including Chrysler, Citroen, Peugeot and Renault, reached an agreement on the standardization of equipment and machine tools (referred to as the CNOMO standard), which specified the size of the connection interface between cylinders and valves.

This is now known as the ISO 15218 (CNOMO) standard.

Just a criterion.

MD, Machinery Directive (2006 42 EC) applies to machinery, mobile machinery, mechanical installations, machines used to lift transport and transport people, and safety accessories. The basic health and safety requirements (EHSR) set out in the regulations cover the entire field of mechanical engineering and are an extremely important aspect of industrial society.

Applicable products. 1. Mechanical.

Machinery refers to a device that is driven by non-human or other animal forces, is equipped or is designed to be equipped with a drive system, consists of several parts, and at least one part can move, and is designed to accomplish a specific purpose; (99% of the production and processing equipment used in the factory belongs to the machinery defined here).

2. Replaceable equipment.

Replaceable equipment refers to a device that can be installed on mechanical equipment to change or increase mechanical functions. The tool is not inferior to the replaceable equipment defined here;

3. Safety element Safety element refers to the element that is purely used to realize the safety function, the element does not affect the function of the machine, if the element fails will greatly threaten the safety of the operator, this element can be circulated separately in the market;

4. Lifting equipment accessories Lifting equipment accessories refer to independent equipment installed between lifting equipment and lifted equipment, and the sling and its components belong to lifting equipment accessories;

5. Chains, ropes, wire mesh Chains, ropes, and wire mesh refer to the elements that are mainly used for lifting installed on the lifting equipment or its accessories;

6. Detachable mechanical transmission device Detachable mechanical transmission device refers to the transmission device installed between the power source and the driven equipment, if the equipment is equipped with a protective device, the protective device and the device should be regarded as one and cannot be separated;

7. Semi-finished machinery Semi-finished machinery refers to the equipment that is about to be assembled into a complete machine, but the equipment itself cannot achieve any function. The independent drive system is a semi-finished machine.

There is only an English version, so if you don't find any other Chinese ones, just make do with it.

German time 1403-1998.

PS: DIN stands for Germany EN stands for European Union and in many cases EN replaces DIN

It should be a worm gear box and a gearbox, and the transmission mode of this valve is a worm gear.