止回阀和球阀在功能、结构及适用场景上存在显著差异，具体区别如下：

　　There are significant differences in function, structure, and applicable scenarios between check valves and ball valves, as follows:

　　一、核心功能差异

　　1、 Core functional differences

　　止回阀

　　check valve

　　主要作用 ：防止管道内介质逆向流动，避免倒流引起的污染、温升或机械损坏。

　　Main function: To prevent the reverse flow of medium in the pipeline, avoid pollution, temperature rise, or mechanical damage caused by backflow.

　　适用场景 ：适用于需要单向流体控制的场景，如给水系统、污水处理等。

　　Applicable scenarios: Suitable for scenarios that require unidirectional fluid control, such as water supply systems, sewage treatment, etc.

　　球阀

　　ball valve

　　主要作用 ：用于切断、分配和改变介质流动方向，同时具备调节功能。

　　Main function: Used to cut off, distribute, and change the direction of medium flow, while also having regulating function.

　　适用场景 ：适用于需要快速启闭、流量调节或自动化控制的管道系统。

　　Applicable scenarios: Suitable for pipeline systems that require rapid opening and closing, flow regulation, or automated control.

　　二、结构特点对比

　　2、 Comparison of structural characteristics

　　止回阀

　　check valve

　　结构类型 ：包括旋启式、升降式、球式等，密封面多为铁基合金或钴基硬质合金，耐磨耐腐蚀。

　　Structural types: including swing type, lift type, ball type, etc. The sealing surface is mostly made of iron-based alloy or cobalt based hard alloy, which is wear-resistant and corrosion-resistant.

　　工作原理 ：通过阀瓣沿通路中心线垂直移动实现开闭，部分类型（如旋启式）需水平安装。

　　Working principle: Opening and closing are achieved by vertically moving the valve disc along the centerline of the passage, and some types (such as rotary opening) require horizontal installation.

　　球阀

　　ball valve

　　结构特点 ：启闭件为球体，由阀杆带动旋转90°开启或关闭，结构简单、体积小。

　　Structural features: The opening and closing components are spherical, driven by the valve stem to rotate 90 ° to open or close, with a simple structure and small volume.

　　工作原理 ：通过球体与阀座的旋转运动控制介质流通，适用于高压力管道。

　　Working principle: Control the flow of medium through the rotational motion of the sphere and valve seat, suitable for high-pressure pipelines.

　　三、性能与适用介质

　　3、 Performance and Applicable Media

　　止回阀 ：密封性能依赖阀瓣与阀座的摩擦，耐磨性较好，但密封面易受介质冲蚀。

　　Check valve: The sealing performance depends on the friction between the valve disc and the valve seat, with good wear resistance, but the sealing surface is easily eroded by the medium.

　　球阀 ：流阻低（接近零），启闭速度快（0.05-0.1秒），适用于高压力、高流量的管道系统。

　　Ball valve: low flow resistance (close to zero), fast opening and closing speed (0.05-0.1 seconds), suitable for high-pressure and high flow pipeline systems.

　　适用介质 ：止回阀多用于水、油品、蒸汽等普通介质，部分特殊材质可耐化学腐蚀；球阀适用范围更广，包括腐蚀性液体。

　　Applicable media: Check valves are mostly used for ordinary media such as water, oil, steam, etc. Some special materials are resistant to chemical corrosion; Ball valves have a wider range of applications, including corrosive liquids.

　　四、安装要求

　　4、 Installation requirements

　　止回阀 ：需注意介质流向与阀体箭头一致，旋启式需水平安装，升降式和球式多用于水平管道。

　　Check valve: It should be noted that the flow direction of the medium should be consistent with the arrow on the valve body. The swing type should be installed horizontally, while the lift type and ball type are mostly used for horizontal pipelines.

　　球阀 ：对安装方向要求较低，但需确保口径、压力与介质匹配。

　　Ball valve: The installation direction requirements are relatively low, but it is necessary to ensure that the diameter, pressure, and medium match.

　　总结 ：止回阀侧重流体单向控制，球阀侧重快速启闭与流量调节，两者在管道系统中常配合使用以满足不同需求。选型时需根据具体工况（如压力、介质、安装条件）综合考量。

　　Summary: Check valves focus on one-way fluid control, while ball valves focus on quick opening and closing and flow regulation. The two are often used in conjunction in pipeline systems to meet different needs. When selecting, it is necessary to consider the specific working conditions (such as pressure, medium, installation conditions) comprehensively.

　　本文由  良工阀门山东销售处  友情奉献.更多有关的知识请点击  http://www.jnlgvf.com/   真诚的态度.为您提供为全面的服务.更多有关的知识我们将会陆续向大家奉献.敬请期待.

　　This article is a friendly contribution from Lianggong Valve Shandong Sales Office For more related knowledge, please click http://www.jnlgvf.com/ Sincere attitude To provide you with comprehensive services We will gradually contribute more relevant knowledge to everyone Coming soon.