1. Gate valve: Gate valve, also known as gate valve or gate valve, is a widely used type of valve. Its closing principle is that the sealing surface of the gate and the sealing surface of the valve seat are highly smooth, flat, and consistent, combined with each other to prevent the flow of media, and rely on the top wedge, spring, or wedge shape of the gate to enhance the sealing effect.

2、截止閥、節流閥：截止閥(Globe Valve)，是使用更廣泛的一種閥。它的閉合原理是，依靠發紺壓力，使閥瓣密封面與閥座密封面緊密貼合，阻止介質流通。節流閥(Throttle Valve)也稱針型閥，外形與截止閥并無區別，但閥瓣形狀不同，用途也不同。它以改變通道面積的形式來調節流量和壓力，有直角式和直通式兩種，都是手動的。

2. Globe Valve is the most widely used type of valve. Its closing principle is to rely on cyanogenic pressure to tightly fit the sealing surface of the valve disc and the sealing surface of the valve seat, preventing medium flow. A throttle valve, also known as a needle valve, has no difference in appearance from a globe valve, but its disc shape and purpose are also different. It adjusts flow and pressure by changing the channel area, and there are two types: right angle and straight through, both of which are manual.

3、球閥：球閥(Ball Valve)，通過旋轉閥芯來使閥門打開或關閉，球閥的閥芯是一個帶孔的球，當該孔的軸線與閥門的進出口的軸線重合時，閥門打開；當兩者垂直時，閥門關閉。

3. Ball valve: Ball valve, which opens or closes the valve by rotating the valve core. The valve core is a ball with a hole, and when the central axis of the hole coincides with the central axis of the inlet and outlet of the valve, the valve opens; When the two are perpendicular, the valve closes.

4、蝶閥：蝶閥(Betterfly Valve)，它的閥瓣是圓盤，圍繞閥座內的一個軸旋轉。旋角的大小，便是閥門的開閉度。

4. Butterfly valve: A butterfly valve, whose disc is a disc that rotates around an axis inside the valve seat. The size of the rotation angle is the opening and closing degree of the valve.

5、止回閥：止回閥（reflux valve），止回閥是指啟閉件為圓形閥瓣并靠自身重量及介質壓力產生動作來阻斷介質倒流的一種閥門。屬自動閥類，又稱逆止閥、單向閥、回流閥或隔離閥。閥瓣運動方式分為升降式和旋啟式。升降式止回閥與截止閥結構類似，僅缺少帶動閥瓣的閥桿。介質從進口端(下側）流入，從出口端（上側）流出。當進口壓力大于閥瓣重量及其流動阻力之和時，閥門被開啟，當介質倒流時閥門則關閉。

5. Check valve: a check valve, which refers to a valve with a circular disc as the opening and closing part and acts by its own weight and medium pressure to block medium backflow. It belongs to the category of automatic valves, also known as check valves, one-way valves, return valves, or isolation valves. The movement mode of the valve disc is divided into lifting type and swing type. The lifting check valve is similar in structure to a globe valve, except for the lack of a stem that drives the valve disc. The medium flows in from the inlet end (lower side) and out from the outlet end (upper side). When the inlet pressure is greater than the sum of the weight of the valve disc and its flow resistance, the valve is opened, and when the medium flows back, the valve is closed.

閥門的用途是很廣的，無論是電力、石油石化、煤化工、航天航空、交通運輸、以及城建農業、人民生活等方面都需要大量各種類型的閥門。在國民經濟中閥門是不可或缺的配件之一，無論是工廠還是礦山都需要用各種各樣的管道來輸送不同的介質。從鋼鐵廠、煉油廠、發電廠、化工廠、油田、氣田，都設有許多水、蒸汽、空氣、油品、天然氣、煤粉和其他腐蝕性介質的管道；煤礦的水力采煤、油田的采油和天然氣的采氣亦同樣；新發展起來的核電、乙烯、PTA 、合成橡膠、合成塑料、合成纖維等更離不開閥門。

Valves have a wide range of applications, including electricity, petroleum and petrochemical, coal chemical, aerospace, transportation, urban construction, agriculture, and people's daily life, which require a large number of various types of valves. Valves are one of the indispensable accessories in the national economy, and both factories and mines require various pipelines to transport different media. From steel mills, refineries, power plants, chemical plants, oil fields, gas fields, there are many pipelines for water, steam, air, oil products, natural gas, coal powder, and other corrosive media; The hydraulic coal mining in coal mines, oil extraction in oil fields, and natural gas extraction are also the same; The newly developed nuclear power, ethylene, PTA, synthetic rubber, synthetic plastics, Synthetic fiber, etc. are even more inseparable from valves.

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