Valves are instruments used to transport and control gases and liquids that have been around for at least a thousand years.
At present, in the liquid piping system, the control valve is the control element, and its main function is to isolate the equipment and piping system, adjust the flow rate, prevent backflow, regulate and relieve pressure. Since it is very important to select the most suitable control valve for the piping system, it is also very important to understand the characteristics of the valve and the steps and basis for valve selection.
The pressure rating of a valve refers to the calculated set pressure associated with the mechanical strength of the piping components, i.e. it is the allowable operating pressure of the valve at a specified temperature, which is related to the material of the valve. , The operating pressure is not the same, so the nominal pressure is a parameter that depends on the material of the valve and is related to the allowable operating temperature and operating pressure of the material.
A valve is a device in a fluid circulation or pressure system that is used to control the flow or pressure of a fluid. Other functions include closing or opening media, flow control, media flow redirection, media backflow prevention, and pressure control or relief.
These functions are realized by adjusting the closed position of the valve. This adjustment can be done manually or automatically. Manual control also includes manual operation of the actuator. Valves with manual control are called manual valves. Valves that prevent backflow are called check valves and those that control the relief pressure are called safety valves or safety valves.
Today, the valve industry can produce a full range of gate valves, ball valves, butterfly valves, plug valves, ball valves, electric valves, diaphragm control valves, check valves, safety valves, pressure reducing valves, steam traps and emergency shutoff valves. 12 categories, more than 3000 models and more than 4000 specifications of valve products; maximum working pressure 600MPa, maximum nominal diameter 5350mm, maximum working temperature 1200℃, minimum working temperature -196℃, applicable medium – water, steam and oil, natural gas, strong corrosive media (such as concentrated nitric acid, medium sulfuric acid concentration, etc.).
1. To reduce the depth of the soil coating of the pipeline, butterfly valves are usually used for larger diameter pipelines, the main disadvantage of butterfly valves is that the butterfly valve occupies a certain area of water, which increases certain pressure losses;
2. Traditional fittings include butterfly valves, gate valves, ball valves, plug valves. When choosing fittings, one should take into account the scope of fittings in the water supply network.
3. The casting process of ball valves and plug valves is complicated and expensive, and generally suitable for small and medium size pipes. Ball valves and plug valves retain the advantages of single gate valves with low water flow resistance, reliable sealing, flexible movements, and convenient operation and maintenance. A plug valve also has similar benefits, but the water cross section is not a perfect circle.
4. If there is little effect on the depth of the soil, try to choose the valve, the height of the electric valve, large diameter vertical valve affects the depth of the pipeline, and the length of the large-diameter horizontal valve increases the occupied horizontal area of the pipeline, which affects the layout of other pipelines;
5. In recent years, with the improvement of casting technology, the use of resin sand casting can avoid or reduce machining, thereby reducing costs, so it is worth exploring the use of ball valves in large diameter pipelines. With regard to the dividing line of the size of the caliber, it should be considered and divided depending on the specific situation.
Original source: https://www.tws-valve.com/news/valve-as-a-tool-has-been-born-for-thousands-of-years/
Media Contact Company Name: Tianjin Tanggu Water Seal Valve Co., Ltd. Email: Send Email Address: No. 105, No. 6 Road, Industrial Park, Xiaozhan Town, Jinnan District City: Tianjin Country: China Website: https://www.tws-valve.com/
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Post time: Nov-17-2022
