你是否也遇到过管道反流、倒灌等问题？止回阀，它像管道里的 “单向守门员”，只允许水、气等流体往前流，牢牢挡住反向倒流的隐患。今天带你快速搞懂止回阀的工作原理。

　　Have you also encountered problems such as pipeline backflow and backflow? A check valve, like a "one-way goalkeeper" in a pipeline, only allows fluids such as water and gas to flow forward, firmly blocking the hidden danger of reverse flow. Today, I will take you to quickly understand the working principle of check valves.

　　一、什么是止回阀止回阀（Check Valve）是一种自动阀门，依靠介质自身流动控制启闭，防止介质逆向流动。图：止回阀内部结构示意图止回阀内部组成结构包含：阀体、阀盖、阀瓣（密封元件）、弹簧（部分类型）等。

　　1、 What is a check valve? A check valve is an automatic valve that relies on the flow of the medium itself to control its opening and closing, preventing the medium from flowing in the opposite direction. Figure: Schematic diagram of the internal structure of the check valve. The internal components of the check valve include: valve body, valve cover, valve disc (sealing element), spring (some types), etc.

　　止回阀的核心部件是阀瓣，其形状通常为圆形。当介质从进口端流入时，介质压力推动阀瓣开启，使介质顺利通过；当介质停止流动或发生倒流时，阀瓣在自身重量和倒流介质压力的共同作用下关闭，从而阻断介质倒流。

　　The core component of a check valve is the valve disc, which is usually circular in shape. When the medium flows in from the inlet end, the pressure of the medium pushes the valve disc to open, allowing the medium to pass smoothly; When the medium stops flowing or experiences backflow, the valve disc closes under the combined action of its own weight and the pressure of the backflow medium, thereby blocking the backflow of the medium.

　　二、止回阀有哪些种类

　　2、 What are the types of check valves

　　1.旋启式止回阀旋启式止回阀一般指微阻止回阀。 微阻止回阀又称逆止阀，其作用是防止管路中的介质倒流。启闭件靠介质流动和力量自行开启或关闭，以防止介质倒流的阀门叫止回阀。止回阀属于自动阀类，主要用于介质单向流动的管道上，只允许介质向一个方向流动，以防止发生事故。

　　1. Swing check valve Swing check valve generally refers to a micro check valve. Micro stop valve, also known as check valve, is used to prevent the backflow of medium in the pipeline. A valve that opens or closes by the flow and force of the medium to prevent reverse flow of the medium is called a check valve. Check valves belong to the category of automatic valves and are mainly used in pipelines where the medium flows in one direction. They only allow the medium to flow in one direction to prevent accidents.

　　2.升降式止回阀    升降式止回阀是指依靠介质本身流动而自动开、闭阀瓣，用来防止介质倒流的阀门，又称逆止阀、单向阀、逆流阀、和背压阀。止回阀属于一种自动阀门，其主要作用是防止介质倒流、防止泵及驱动电动机反转，以及容器介质的泄放。止回阀还可用于给其中的压力可能升至超过系统压的辅助系统提供补给的管路上。止回阀主要可分为旋启式止回阀（依重心旋转）与升降式止回阀（沿轴线移动）。

　　2. Lift check valve Lift check valve refers to a valve that automatically opens and closes the valve disc based on the flow of the medium itself, used to prevent the backflow of the medium, also known as check valve, one-way valve, backflow valve, and back pressure valve. Check valve belongs to an automatic valve, whose main function is to prevent medium backflow, prevent pump and drive motor from reversing, and prevent the release of container medium. Check valves can also be used on pipelines to supply auxiliary systems where the pressure may rise above the system pressure. Check valves can be mainly divided into swing check valves (rotating according to the center of gravity) and lift check valves (moving along the axis).

　　3.对夹式止回阀对夹止回阀又称为逆流阀、逆止阀、背压阀、单向阀。这类阀门是靠管路中介质本身的流动产生的力而自动开启和关闭的，属于一种自动阀门。

　　3. Clamp on check valve, also known as reverse flow valve, check valve, back pressure valve, or one-way valve. This type of valve is automatically opened and closed by the force generated by the flow of the medium itself in the pipeline, and belongs to an automatic valve.

　　4.静音式止回阀静音式止回阀功能特点：采用弹簧辅助关闭，可减少流体倒流时的噪音及水击。“

　　4. Silent check valve. Silent check valve features: It uses spring assisted closing to reduce noise and water hammer during fluid backflow. “

　　三、调节阀有什么优势

　　3、 What are the advantages of regulating valves

　　1防止介质倒流止回阀最基本的功能是防止介质在管道中倒流。当介质流动方向发生变化时，止回阀会自动关闭，阻止介质反向流动，从而保护设备和系统不受损害。

　　The most basic function of a check valve to prevent medium backflow is to prevent the medium from flowing back in the pipeline. When the direction of medium flow changes, the check valve will automatically close to prevent the medium from flowing in the opposite direction, thereby protecting the equipment and system from damage.

　　2自动启闭止回阀依靠介质自身的压力和重量来实现自动开启和关闭，无需外部动力，这使其在各种工况下都能稳定工作。

　　The automatic opening and closing check valve relies on the pressure and weight of the medium itself to achieve automatic opening and closing, without the need for external power, which enables it to work stably under various working conditions.

　　3适用多种工况止回阀适用于各种高温、高压、腐蚀性介质等恶劣工况，能够长期稳定运行，确保系统的安全性和可靠性。

　　3. Suitable for various working conditions. Check valves are suitable for harsh working conditions such as high temperature, high pressure, and corrosive media, and can operate stably for a long time to ensure the safety and reliability of the system.

　　4结构多样止回阀有多种类型，如升降式、旋启式等，适用于不同的管道直径和流体条件。例如，旋启式止回阀适用于大口径管道，而升降式止回阀则适用于高压小口径管道。

　　There are various types of check valves with diverse structures, such as lift type, swing type, etc., suitable for different pipeline diameters and fluid conditions. For example, swing check valves are suitable for large-diameter pipelines, while lift check valves are suitable for high-pressure small-diameter pipelines.

　　5维护成本低由于止回阀结构简单，维护和检修相对方便，降低了长期运行的维护成本。“

　　5. Low maintenance cost: Due to the simple structure of the check valve, maintenance and repair are relatively convenient, reducing the maintenance cost of long-term operation. “

　　四、如何安装维护止回阀

　　4、 How to install and maintain check valves

　　安装要求

　　Installation requirements

　　1确认阀门方向与介质流向一致。

　　1. Confirm that the valve direction is consistent with the flow direction of the medium.

　　2避免安装在有振动的管道位置。

　　2. Avoid installing in vibrating pipeline locations.

　　维护要点

　　Maintenance points

　　1定期检查密封性，清理阀瓣异物。

　　Regularly check the sealing and clean any foreign objects from the valve disc.

　　2高压系统需检查弹簧或阀瓣磨损情况。

　　The high-pressure system needs to check the wear of the spring or valve disc.

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　　This article is a friendly contribution from the Jinan sales office of Shanghai Lianggong Valve 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.