The requirements of soft seal gate valves, the difference between elastic soft seal gate valves and

1. The manufacturing standard of soft seal gate valve should indicate the national standard number based on it, and if the soft seal gate valve is an enterprise standard, the enterprise documents should be attached to the procurement contract.

2. The model of the soft seal gate valve should indicate the national standard number requirements according to it. If it is an enterprise standard, the relevant description of the model should be indicated.

3. The specifications and categories of soft seal gate valves should meet the requirements of pipeline design documents.

4. The working pressure of the soft seal gate valve is required to be greater than the working pressure of the pipeline, and the working pressure that the valve can withstand should be greater than the actual working pressure of the pipeline without affecting the first grade; Under the closed condition of the soft seal gate valve, any side should be able to withstand the working pressure value of the valve without leakage; When the valve is opened, the valve body should be able to withstand twice the working pressure of the valve.

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.

1. In terms of planning mechanism: the hard seal is the seal between metal and metal, and the sealing ball and valve seat are metal. The machining accuracy and skills are relatively difficult, and it is generally used in high pressure, generally more than 35MPa.

A soft seal is a seal between metal and non-metal, such as nylon PTFE, and the standard of manufacture is the same.

2. Sealing material: elastic soft seal gate valve and hard seal gate valve are the sealing materials of the valve seat, and the hard seal is precision machining of the valve seat material to ensure the accuracy of cooperation with the valve core (ball), generally stainless steel and copper. Soft sealing means that the sealing material embedded in the valve seat is a non-metallic material, because the soft sealing material has a certain elasticity, so the processing accuracy needs to be relatively low than the hard seal.

3. Manufacturing skills: due to the chaotic working environment of many chemical and machinery industries, many of them are high temperature and high pressure, and the friction resistance of the medium is large and corrosive. Nowadays, the skills have improved, the use of various materials is better, and the processing and other aspects can keep up, so that the hard seal ball valve has been widely promoted.

In fact, the principle of hard seal ball valve is the same as that of soft seal, but because it is a seal between metals, it is necessary to consider the hardness contact between metals, as well as working conditions, what medium to go, etc. Generally, it needs to be hardened, and the ball and seat need to be continuously ground to reach the seal. The production cycle of the hard seal ball valve is long, the processing is messy, and it is not easy to do a good job of the hard seal ball valve.

4. In terms of application conditions: soft seals can generally reach high seals, while hard seals can be high or low according to needs. Soft seals need to be fireproof, because at high temperatures, the material of the soft seal will leak, while the hard seal has no such doubt.

Hard seals can generally be made with high pressures, but soft seals cannot. Soft seals cannot be used in some occasions due to the problem of the medium flowed (such as some corrosive media). Hard-seal valves are generally more expensive than soft-sealed.

As for the manufacturing, the two are not much different, the first is the difference between the valve seats, the soft seal is the wrong metal, and the hard seal is metal.