在流體管道系統中，閥門是控制元件，其主要作用是隔離設備和管道系統、調節流量、防止回流、調節和排泄壓力。

　　In fluid pipeline systems, valves are control components whose main functions are to isolate equipment and pipeline systems, regulate flow, prevent backflow, and regulate and discharge pressure.

　　閥門可用于控制空氣、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。由于管道系統選擇適合的閥門顯得非常重要，所以，了解閥門的特性及選擇閥門的步驟和依據也變得關重要起來。一、閥門的分類閥門總的可分兩大類：1、自動閥門依靠介質（液體、氣體）本身的能力而自行動作的閥門。

　　Valves can be used to control the flow of various types of fluids such as air, water, steam, various corrosive media, mud, oil, liquid metals, and radioactive media. Due to the importance of selecting the most suitable valve for pipeline systems, understanding the characteristics of valves and the steps and criteria for selecting valves have become crucial. 1、 The classification of valves can generally be divided into two categories: 1. Automatic valves that rely on the ability of the medium (liquid, gas) to operate on their own.

　　如止回閥、閥、調節閥、疏水閥、減壓閥等。2、驅動閥門借助手動、電動、液動、氣動來操縱動作的閥門。

　　Such as check valves, safety valves, regulating valves, drain valves, pressure reducing valves, etc. 2. A valve that is operated manually, electrically, hydraulically, or pneumatically to control its movement.

　　如閘閥，截止閥、節流閥、蝶閥、球閥、旋塞閥等。按結構特征，根據關閉件相對于閥座移動的方向可分為：

　　Such as gate valves, globe valves, throttle valves, butterfly valves, ball valves, plug valves, etc. According to the structural characteristics, it can be divided into:

　　（1）截門形：關閉件沿著閥座中心移動；（2）閘門形：關閉件沿著垂直閥座中心移動；（3）旋塞和球形：關閉件是柱塞或球，圍繞本身的中心線旋轉；（4）旋啟形：關閉件圍繞閥座外的軸旋轉；（5）碟形：關閉件的圓盤，圍繞閥座內的軸旋轉；（6）滑閥形：關閉件在垂直于通道的方向滑動。按用途，根據閥門的不同用途可分為：

　　(1) Truncated gate shape: the closing element moves along the center of the valve seat; (2) Gate shaped: The closing component moves along the center of the vertical valve seat; (3) Cock and ball: The closing component is a plunger or ball that rotates around its own centerline; (4) Spiral opening shape: the closing element rotates around the axis outside the valve seat; (5) Disc shape: a circular disk of a closure that rotates around an axis inside the valve seat; (6) Slide valve shape: The closing element slides in a direction perpendicular to the channel. According to their different uses, valves can be divided into:

　　（1）開斷用：用來接通或切斷管路介質，如截止閥、閘閥、球閥、蝶閥等。（2）止回用：用來防止介質倒流，如止回閥。（3）調節用：用來調節介質的壓力和流量，如調節閥、減壓閥。（4）分配用：用來改變介質流向、分配介質，如三通旋塞、分配閥、滑閥等。（5）閥：在介質壓力超過規定值時，用來排放多余的介質，保證管路系統及設備，如閥、事故閥。（6）其它特殊用途：如疏水閥、放空閥、排污閥等。按驅動方式，根據不同的驅動方式可分為：（1）手動：借助手輪、手柄、杠桿或鏈輪等，有人力驅動，傳動較大力矩時裝有蝸輪、齒輪等減速裝置。（2）電動：借助電機或其他電氣裝置來驅動。（3）液動：借助（水、油）來驅動。（4）氣動：借助壓縮空氣來驅動。

　　(1) Disconnecting function: used to connect or disconnect pipeline media, such as globe valves, gate valves, ball valves, butterfly valves, etc. (2) Check valve: used to prevent medium backflow, such as a check valve. (3) Regulating: Used to regulate the pressure and flow rate of a medium, such as regulating valves and pressure reducing valves. (4) Distribution purpose: Used to change the flow direction and distribute media, such as three-way plugs, distribution valves, slide valves, etc. (5) Safety valve: Used to discharge excess medium when the medium pressure exceeds the specified value, ensuring the safety of pipeline systems and equipment, such as safety valves and emergency valves. (6) Other special purposes: such as drain valves, vent valves, drain valves, etc. According to the driving method, it can be divided into: (1) manual: with the help of handwheels, handles, levers, or sprockets, there is manual driving, and when transmitting large torque, there are reduction devices such as worm gears and gears. (2) Electric: driven by an electric motor or other electrical device. (3) Hydraulic: driven by (water, oil). (4) Pneumatic: driven by compressed air.

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