A check valve is a device that allows fluid to flow in only one direction. They have two ports, one as the media inlet and the other as the media output. Because they only allow one-way flow of medium, they are usually called "one-way valves" or "check valves". Xiaobian tells you that the main purpose of the check valve is to prevent backflow of the system.

止回閥依靠壓差工作。它們需要閥門輸入側的壓力高于輸出側的壓力才能打開閥門。當出口側壓力較高（或輸入側壓力不夠高）時，閥門將關閉。上閥閥門廠告訴你根據閥門類型，關閉機制是不同的。與其他閥門不同，它們不需要手柄、杠桿、執行器或人工即可正常工作。它們通常安裝在回流會導致問題的應用程序中。但是，由于它們是止回閥，因此它們是潛在問題的廉價、有效且簡單的方案。如果回流被污染，回流可能會導致問題，因此會污染上游介質。

The check valve works by pressure difference. They require the pressure on the input side of the valve to be higher than the pressure on the output side to open the valve. When the outlet side pressure is high (or the input side pressure is not high enough), the valve will close. The valve factory tells you that the closing mechanism is different according to the valve type. Unlike other valves, they do not require handles, levers, actuators, or labor to function properly. They are usually installed in applications where reflow can cause problems. However, since they are non-return valves, they are inexpensive, effective and simple solutions to potential problems. If the backflow is contaminated, the backflow may cause problems and thus contaminate the upstream medium.

下水道將有一個止回閥，以確保廢物可以離開但不會重新進入系統。如果回流會對上游設備造成損壞，并且只能允許介質沿一個方向流動，則也可以使用它們。上閥閥門廠告訴你反滲透過濾器只能讓水從一個方向通過，因此在下游安裝了一個單向閥來防止這種情況。有各種尺寸、設計和材料，以確保每個應用都有一個止回閥。

The sewer will have a check valve to ensure that waste can leave but not re-enter the system. They can also be used if backflow can damage the upstream equipment and only allow the media to flow in one direction. The valve manufacturer told you that the reverse osmosis filter can only allow water to pass in one direction, so a one-way valve is installed at the downstream to prevent this situation. There are various sizes, designs and materials to ensure that each application has a check valve.

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