你是否也遇到過管道反流、倒灌等問題？止回閥，它像管道里的 “單向守門員”，只允許水、氣等流體往前流，牢牢擋住反向倒流的隱患。今天帶你快速搞懂止回閥的工作原理。

　　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、什么是止回閥止回閥（Check Valve）是一種自動閥門，依靠介質自身流動控制啟閉，防止介質逆向流動。圖：止回閥內部結構示意圖止回閥內部組成結構包含：閥體、閥蓋、閥瓣（密封元件）、彈簧（部分類型）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.

　　止回閥的核心部件是閥瓣，其形狀通常為圓形。當介質從進口端流入時，介質壓力推動閥瓣開啟，使介質順利通過；當介質停止流動或發生倒流時，閥瓣在自身重量和倒流介質壓力的共同作用下關閉，從而阻斷介質倒流。

　　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、止回閥有哪些種類

　　2、 What are the types of check valves

　　1.旋啟式止回閥旋啟式止回閥一般指微阻止回閥。 微阻止回閥又稱逆止閥，其作用是防止管路中的介質倒流。啟閉件靠介質流動和力量自行開啟或關閉，以防止介質倒流的閥門叫止回閥。止回閥屬于自動閥類，主要用于介質單向流動的管道上，只允許介質向一個方向流動，以防止發生事故。

　　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.升降式止回閥    升降式止回閥是指依靠介質本身流動而自動開、閉閥瓣，用來防止介質倒流的閥門，又稱逆止閥、單向閥、逆流閥、和背壓閥。止回閥屬于一種自動閥門，其主要作用是防止介質倒流、防止泵及驅動電動機反轉，以及容器介質的泄放。止回閥還可用于給其中的壓力可能升至超過系統壓的輔助系統提供補給的管路上。止回閥主要可分為旋啟式止回閥（依重心旋轉）與升降式止回閥（沿軸線移動）。

　　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.對夾式止回閥對夾止回閥又稱為逆流閥、逆止閥、背壓閥、單向閥。這類閥門是靠管路中介質本身的流動產生的力而自動開啟和關閉的，屬于一種自動閥門。

　　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.靜音式止回閥靜音式止回閥功能特點：采用彈簧輔助關閉，可減少流體倒流時的噪音及水擊。“

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

　　三、調節閥有什么優勢

　　3、 What are the advantages of regulating valves

　　1防止介質倒流止回閥最基本的功能是防止介質在管道中倒流。當介質流動方向發生變化時，止回閥會自動關閉，阻止介質反向流動，從而保護設備和系統不受損害。

　　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自動啟閉止回閥依靠介質自身的壓力和重量來實現自動開啟和關閉，無需外部動力，這使其在各種工況下都能穩定工作。

　　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適用多種工況止回閥適用于各種高溫、高壓、腐蝕性介質等惡劣工況，能夠長期穩定運行，確保系統的安全性和可靠性。

　　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結構多樣止回閥有多種類型，如升降式、旋啟式等，適用于不同的管道直徑和流體條件。例如，旋啟式止回閥適用于大口徑管道，而升降式止回閥則適用于高壓小口徑管道。

　　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維護成本低由于止回閥結構簡單，維護和檢修相對方便，降低了長期運行的維護成本。“

　　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、如何安裝維護止回閥

　　4、 How to install and maintain check valves

　　安裝要求

　　Installation requirements

　　1確認閥門方向與介質流向一致。

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

　　2避免安裝在有振動的管道位置。

　　2. Avoid installing in vibrating pipeline locations.

　　維護要點

　　Maintenance points

　　1定期檢查密封性，清理閥瓣異物。

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

　　2高壓系統需檢查彈簧或閥瓣磨損情況。

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

　　本文由  上海良工閥濟南銷售處 友情奉獻.更多有關的知識請點擊  http://www.xibanyayutongchuan.cn/   真誠的態度.為您提供為全面的服務.更多有關的知識我們將會陸續向大家奉獻.敬請期待.

　　This article is a friendly contribution from the Jinan sales office of Shanghai Lianggong Valve For more related knowledge, please click http://www.xibanyayutongchuan.cn/ Sincere attitude To provide you with comprehensive services We will gradually contribute more relevant knowledge to everyone Coming soon.