Language
As a key device for realizing fluid on-off control in a pipeline system, a gate valve plays an important role in the fluid delivery system of multiple industries due to its low flow resistance and reliable sealing when fully open. Its uses cover a wide range of scenarios from daily water supply to industrial production.
In municipal infrastructure, gate valves are the "switch center" of urban water supply and drainage networks. Large-diameter gate valves (DN300-DN2000) on the main water pipes can realize the overall regulation of regional water supply, and can quickly cut off the water flow during sudden pipeline maintenance to reduce the scope of water outage. The sludge delivery pipelines of sewage treatment plants use corrosion-resistant gate valves, and the wear-resistant design of their gate plates can adapt to fluids containing impurities and ensure the stable operation of sewage treatment systems.
The reliance on gate valves in the industrial production field is particularly significant. In the petrochemical industry, gate valves are used in pipelines for the delivery of crude oil, refined oil and chemical media. High-pressure gate valves (pressure level 16-42MPa) can withstand high temperature and high pressure environments to ensure the safe delivery of flammable and explosive media. Steam pipes in the power industry mostly use cast steel gate valves, whose high temperature resistance (applicable temperature ≤ 540℃) can meet the control requirements of the steam circulation system of thermal power plants and prevent high-temperature steam leakage from causing safety accidents.
In construction and civil engineering, the application of gate valves focuses on system zoning control. The fire water pipe network of high-rise buildings uses signal gate valves, which are linked to the fire alarm system and automatically open to ensure fire water in case of fire; the branch pipelines of the central air-conditioning water circulation system use gate valves to adjust the flow rate to achieve precise temperature control in each area. In addition, the household gate valves of the community heating pipe network are convenient for controlling the heating of each household individually, and there is no need to shut down the heat source of the entire building during maintenance.
In water conservancy and agricultural irrigation scenarios, the large flow characteristics of gate valves are fully utilized. The gate valves on the reservoir flood discharge pipes and irrigation channels can be opened quickly to achieve large-area water supply. The cast iron gate valves are resistant to mud and sand wear and can adapt to impurities in farmland irrigation water. In seawater desalination projects, corrosion-resistant gate valves (such as rubber-lined gate valves) can resist the strong corrosiveness of seawater and ensure the long-term stability of the desalination water delivery system.
The application of gate valves in the transportation field focuses on reliability. The ballast water system of ships uses bronze gate valves, and its anti-rust performance is suitable for the marine environment; the bottom unloading valve of the railway tank car adopts a gate valve structure, which has no throttling resistance when fully opened, and can quickly complete the loading and unloading of oil. These scenarios require gate valves not only to have on-off control, but also to have anti-vibration and impact resistance to ensure no leakage in a bumpy environment.
The core value of the gate valve lies in the efficient control of "full open and full closed". Its flow resistance coefficient is only 1/5-1/10 of that of the stop valve, which can reduce pipeline energy consumption and is especially suitable for large-caliber and large-flow fluid transportation systems. Gate valves of different materials (cast iron, cast steel, stainless steel) and structures (rising stem, dark stem) can adapt to a variety of fluids such as water, oil, steam, corrosive media, etc., and have become a common equipment for cross-industry fluid control. Reasonable selection and installation of gate valves are the key to ensuring the safe operation of pipeline systems and reducing maintenance costs, and are also an indispensable and important component in fluid transportation projects in various industries.
-
