蝶阀是所有阀门中结构为简单、体积小、重量轻的品类之一。蝶阀的启闭件是一个圆盘形的蝶板（又称阀瓣），蝶板在阀体内绕自身轴线旋转（通常为90°），从而实现阀门的开启、关闭或流量调节。由于蝶板的形状类似蝴蝶翅膀，蝶阀又被称为“翻板阀”。

Butterfly valve is one of the categories of valves with simple structure, small volume, and light weight. The opening and closing component of a butterfly valve is a disc-shaped disc (also known as a valve disc), which rotates around its own axis within the valve body (usually 90 °) to achieve valve opening, closing, or flow regulation. Due to its shape resembling butterfly wings, butterfly valves are also known as "flap valves".

蝶阀的工作原理非常直观——驱动装置驱动阀杆旋转，阀杆带动蝶板同步转动。当蝶板旋转到与管道轴线平行时，阀门全开，介质流通面积大；当蝶板旋转90°与管道轴线垂直时，阀门全关，介质被截断。在0°到90°之间的任意角度，蝶板都可以对介质流量进行连续调节。因此，蝶阀不仅具备截断功能，还兼具良好的流量调节功能。

The working principle of butterfly valves is very intuitive - the driving device drives the valve stem to rotate, and the valve stem drives the butterfly plate to rotate synchronously. When the butterfly plate rotates parallel to the pipeline axis, the valve is fully opened and the medium flow area is large; When the butterfly plate rotates 90 ° perpendicular to the pipeline axis, the valve is fully closed and the medium is cut off. The butterfly plate can continuously adjust the medium flow rate at any angle between 0 ° and 90 °. Therefore, butterfly valves not only have shut-off functions, but also have good flow regulation functions.

蝶阀突出的优势在于其轻量化。以DN1000口径为例，蝶阀的重量约为2吨，而同口径的闸阀重约3.5吨——蝶阀比闸阀轻了40%以上。这种重量优势在大口径管道中尤为显著，大幅降低了安装成本和支撑结构的要求。此外，蝶阀结构简单、零部件少，仅由少数几个零件组成。安装尺寸小、操作力矩小，易于与各种驱动装置（电动、气动、液动）组合。

The outstanding advantage of butterfly valves lies in their lightweight design. Taking DN1000 caliber as an example, the weight of a butterfly valve is about 2 tons, while a gate valve of the same caliber weighs about 3.5 tons - butterfly valves are over 40% lighter than gate valves. This weight advantage is particularly significant in large-diameter pipelines, greatly reducing installation costs and support structure requirements. In addition, butterfly valves have a simple structure and few components, consisting only of a few parts. Small installation size, low operating torque, easy to combine with various driving devices (electric, pneumatic, hydraulic).

蝶阀按密封形式可分为软密封蝶阀和硬密封蝶阀两大类。软密封蝶阀的阀座采用橡胶、聚四氟乙烯等弹性材料，密封性能好、泄漏量低，但使用温度受限于密封材料（通常不超过150℃）。硬密封蝶阀的阀座和蝶板密封面均为金属材料（通常堆焊硬质合金），适用于高温（可达425℃以上）和腐蚀性介质。按连接方式可分为对夹式蝶阀（用双头螺栓将阀门连接在两管道法兰之间）和法兰式蝶阀（阀门自带法兰与管道法兰连接）。按结构特点还可分为中线蝶阀（阀杆轴线与蝶板中心线重合）、偏心蝶阀（阀杆轴线偏离蝶板中心）等。三偏心蝶阀通过精密的弹性密封圈和多层金属硬密封结构，实现了优异的密封性能和长使用寿命。

Butterfly valves can be divided into two categories based on their sealing form: soft sealed butterfly valves and hard sealed butterfly valves. The valve seat of the soft sealed butterfly valve is made of elastic materials such as rubber and polytetrafluoroethylene, which have good sealing performance and low leakage, but the operating temperature is limited by the sealing material (usually not exceeding 150 ℃). The valve seat and disc sealing surface of the hard sealed butterfly valve are both made of metal materials (usually welded with hard alloy), suitable for high temperatures (up to 425 ℃ or above) and corrosive media. According to the connection method, it can be divided into clamp butterfly valves (connected between two pipeline flanges with double headed bolts) and flange butterfly valves (connected to the pipeline flange with the valve's own flange). According to structural characteristics, it can also be divided into midline butterfly valves (valve stem axis coincides with the center line of the butterfly plate), eccentric butterfly valves (valve stem axis deviates from the center of the butterfly plate), etc. The three eccentric butterfly valve achieves excellent sealing performance and long service life through precise elastic sealing rings and multi-layer metal hard sealing structure.

良工阀门生产的蝶阀产品线出彩为丰富。对夹式蝶阀结构简单、体积小、重量轻，只需旋转90°即可快速启闭。法兰式蝶阀适用于标准法兰连接的管道系统。焊接蝶阀通过焊接方式与管道连接，适用于高温高压工况。硬密封蝶阀采用金属密封面，适用于高温和腐蚀性介质。双向压蝶阀、烟气脱硫蝶阀等特种产品则针对特定工况进行了专门设计。此外，还有电动蝶阀、气动蝶阀等自动化产品。良工阀门还可提供1200℃超高温蝶阀等出众产品。

The butterfly valve product line produced by Lianggong Valve is extremely rich. The clamp type butterfly valve has a simple structure, small volume, and light weight, and can be quickly opened and closed by simply rotating 90 °. Flange butterfly valves are suitable for piping systems with standard flange connections. Welded butterfly valves are connected to pipelines through welding and are suitable for high temperature and high pressure conditions. Hard sealed butterfly valves use metal sealing surfaces and are suitable for high temperature and corrosive media. Special products such as bidirectional pressure butterfly valves and flue gas desulfurization butterfly valves are specially designed for specific working conditions. In addition, there are automation products such as electric butterfly valves and pneumatic butterfly valves. Lianggong Valve can also provide high-end products such as 1200 ℃ ultra-high temperature butterfly valves.

蝶阀广泛应用于给排水、市政建设、电力、石油化工、冶金等行业的管道系统中。在大口径、低压力的水处理系统和通风除尘系统中，蝶阀几乎是无可替代的选择。蝶阀既可以作为截断阀使用，也可以作为调节阀使用，是一种兼具截断与调节双重功能的多用途阀门。

Butterfly valves are widely used in pipeline systems in industries such as water supply and drainage, municipal construction, power, petrochemicals, metallurgy, etc. Butterfly valves are almost an irreplaceable choice in large-diameter, low-pressure water treatment systems and ventilation and dust removal systems. Butterfly valve can be used as both a shut-off valve and a regulating valve, and is a multi-purpose valve that combines both shut-off and regulating functions.

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