使用場合：

　　Usage scenario:

　　閥門廣泛應用于流體輸送系統中，用于控制空氣、水、蒸汽、各種腐蝕性介質、泥漿、油品、液態金屬和放射性介質等各種類型流體的流動。

　　Valves are widely used in fluid transportation systems to control the flow of various types of fluids such as air, water, steam, various corrosive media, mud, oil, liquid metals, and radioactive media.

　　具體應用包括但不限于截斷類（如閘閥、截止閥等）、止回類（用于阻止介質倒流）、調節類（調節介質的壓力和流量）、類（在介質壓力超過規定值時排放多余的介質）以及分配類（改變介質流向）等。

　　Specific applications include but are not limited to shut-off valves (such as gate valves, globe valves, etc.), check valves (used to prevent medium backflow), regulating valves (regulating the pressure and flow rate of the medium), safety valves (discharging excess medium when the medium pressure exceeds the specified value), and distribution valves (changing the flow direction of the medium).

　　高壓閥廣泛適用于石油、化工、電力、冶金、航空等各個領域的高壓設備中，如鍋爐、壓縮機、管道、容器等，保護設備免受過壓，防止發生爆炸等危險事故。

　　High pressure safety valves are widely used in high-pressure equipment in various fields such as petroleum, chemical, power, metallurgy, aviation, etc., such as boilers, compressors, pipelines, containers, etc., to protect equipment from overpressure and prevent dangerous accidents such as explosions.

　　閥門的選擇不僅基于其壓力范圍，還考慮工作溫度、介質特性以及特定的工業應用要求。例如，高溫閥工作溫度≥450℃，中溫閥120℃≤工作溫度<450℃，常溫閥-40℃≤工作溫度<120℃，低溫閥-100℃≤工作溫度<40℃，超低溫閥工作溫度<-100℃。此外，閥門的材質也是選擇的關鍵因素，包括鑄鐵、鑄鋼、不銹鋼（201、304、316等）、鉻鉬鋼、鉻鉬釩鋼、雙相鋼、塑料等。

　　The selection of valves is not only based on their pressure range, but also takes into account working temperature, medium characteristics, and specific industrial application requirements. For example, high-temperature valves have a working temperature of ≥ 450 ℃, medium temperature valves have a working temperature of 120 ℃ ≤<450 ℃, normal temperature valves have a working temperature of -40 ℃ ≤<120 ℃, low-temperature valves have a working temperature of -100 ℃ ≤<40 ℃, and ultra-low temperature valves have a working temperature of<-100 ℃. In addition, the material of the valve is also a key factor in the selection, including cast iron, cast steel, stainless steel (201, 304, 316, etc.), chromium molybdenum steel, chromium molybdenum vanadium steel, duplex steel, plastic, etc.