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Anonymous users2024-02-07Here 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 are the top ten domestic first-line valve brand manufacturers in 2022-2023, but for reference only: Suzhou Neway Valve Co., Ltd., Shanghai Guanlong Valve Machinery, Shanghai Qizhong Valve Manufacturing, 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.
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Anonymous users2024-02-06The function is to prevent the liquid from backing up.
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Anonymous users2024-02-05Answer]: C analysis] Compared with the gate valve and the globe valve, the gate valve is labor-saving when opening and closing, the water flow resistance is smaller, the valve body is relatively short, and when the gate valve is fully opened, its valve plate is not subject to the erosion and wear of the flowing medium. However, the disadvantage of the brake is that the tightness is poor, especially when the opening and closing are frequent, the sealing surface between the gate plate and the valve seat is easy to be worn; When it is not fully turned on, the resistance to the flow of water is still greater.
Therefore, the gate valve is generally only used as a cut-off device, that is, it is used in the pipeline that is fully opened or completely closed, and should not be used in the pipeline that needs to be adjusted in size and opened and closed frequently. Envy.
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Anonymous users2024-02-04Answer]: c, d
Textbook P46-47 globe valve is mainly used in hot water** and high-pressure steam pipelines, with high tightness. When installing, it is necessary to pay attention to the "low in and high out" of the fluid, and the direction cannot be reversed. Selection features:
The structure is simpler than that of the gate valve, easy to manufacture and maintain, and the flow rate can be adjusted, but the flow resistance is large, and it is not suitable for media with particles and large viscosity. Gate valves are widely used in hot and cold water piping systems. Compared with the globe valve, the gate valve has less effort to open and close, and the water flow resistance is smaller.
The sealing surface between the ram and the valve seat is susceptible to wear and tightness; When it is not fully opened, the water flow resistance is greater. Gate valves are generally only used as a shut-off device, and should not be used on pipelines that need to be adjusted in size and open and close frequently. There is no installation direction for the gate valve.
The selection characteristics of gate valves: good sealing performance, small fluid resistance, small opening and closing force holes, and the effect of adjusting the flow rate, and the opening size of the valve can be seen from the lifting height of the valve stem, which is mainly used in some large-diameter pipelines. Qi Mu.
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Anonymous users2024-02-03Answer]: a, d
The tightness of the gate valve is poor, there is no installation direction, the resistance of the water flow is small, and the opening and closing of the gate valve save the force of the shed, so the gate valve can only be used as a cut-off device.
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