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、截止阀、节流阀：截止阀(Globe Valve)，是使用更广泛的一种阀。它的闭合原理是，依靠发绀压力，使阀瓣密封面与阀座密封面紧密贴合，阻止介质流通。节流阀(Throttle Valve)也称针型阀，外形与截止阀并无区别，但阀瓣形状不同，用途也不同。它以改变通道面积的形式来调节流量和压力，有直角式和直通式两种，都是手动的。

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、球阀：球阀(Ball Valve)，通过旋转阀芯来使阀门打开或关闭，球阀的阀芯是一个带孔的球，当该孔的轴线与阀门的进出口的轴线重合时，阀门打开；当两者垂直时，阀门关闭。

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、蝶阀：蝶阀(Betterfly Valve)，它的阀瓣是圆盘，围绕阀座内的一个轴旋转。旋角的大小，便是阀门的开闭度。

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、止回阀：止回阀（reflux valve），止回阀是指启闭件为圆形阀瓣并靠自身重量及介质压力产生动作来阻断介质倒流的一种阀门。属自动阀类，又称逆止阀、单向阀、回流阀或隔离阀。阀瓣运动方式分为升降式和旋启式。升降式止回阀与截止阀结构类似，仅缺少带动阀瓣的阀杆。介质从进口端(下侧）流入，从出口端（上侧）流出。当进口压力大于阀瓣重量及其流动阻力之和时，阀门被开启，当介质倒流时阀门则关闭。

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.

阀门的用途是很广的，无论是电力、石油石化、煤化工、航天航空、交通运输、以及城建农业、人民生活等方面都需要大量各种类型的阀门。在国民经济中阀门是不可或缺的配件之一，无论是工厂还是矿山都需要用各种各样的管道来输送不同的介质。从钢铁厂、炼油厂、发电厂、化工厂、油田、气田，都设有许多水、蒸汽、空气、油品、天然气、煤粉和其他腐蚀性介质的管道；煤矿的水力采煤、油田的采油和天然气的采气亦同样；新发展起来的核电、乙烯、PTA 、合成橡胶、合成塑料、合成纤维等更离不开阀门。

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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