軟密封閘閥是一種經常用于管道水的閥門，由于閥門內的水流會流經該產品閥的管道，所以閥門材質的不同也會影響到內部流水的水質，那具體有什么影響呢？

Soft seal gate valve is a valve often used for pipeline water. Since the water in the valve will flow through the pipeline of the product valve, the different material of the valve will also affect the quality of internal water. What is the specific impact?

我國現有軟密封閘閥給水管網的管材一般采用鋼管、鑄鐵管，當出廠水具有腐蝕性時或管道使用年限過長時，管道內壁就會腐蝕結垢，另外微生物的繁殖也會導致管道內壁結垢。銹蝕物中含有大量的鐵、鉛、鋅和各種藻類，當管道內水流速度、方向或水壓發生突變時，就會造成短時間的水質惡化，出現鐵、錳、色度、濁度和指標值的大幅度上升。有研究表明，對于未作防腐處理的金屬管道，當年限超過5~10年時，污垢就已達到了惡化水質的程度，對于防腐處理較差的金屬管道，3~5年就開始出現腐蝕現象，管道使用年限越長，腐蝕越嚴重，水質情況越糟糕。

The pipes of the existing soft seal gate valve water supply network in China are generally steel pipes and cast iron pipes. When the factory water is corrosive or the service life of the pipeline is too long, the inner wall of the pipeline will corrode and scale, and the reproduction of microorganisms will also lead to the scaling of the inner wall of the pipeline. The rust contains a large amount of iron, lead, zinc and various algae. When the water flow velocity, direction or water pressure in the pipeline changes suddenly, it will cause the deterioration of water quality in a short time and the sharp rise of iron, manganese, chromaticity, turbidity and index value. Studies have shown that for metal pipelines without anti-corrosion treatment, when the service life exceeds 5 ~ 10 years, the dirt has reached the degree of deterioration of water quality. For metal pipelines with poor anti-corrosion treatment, corrosion begins to appear in 3 ~ 5 years. The longer the service life of the pipeline, the more serious the corrosion is, and the worse the water quality is.

使用金屬作為給水管材料會對水質構成二次污染。一般來講，供水水質在進入城市管網管道之前，都能達到   標準。但因其不是純凈水，普遍含有某些金屬元素、化合物以及微生物。當水在管道中流動的時候，由于化學物的分，軟密封閘閥管道涂層材料的脫落，余氯衰減等原因，使得水和管內壁的材質發生化學作用。

Using metal as water supply pipe material will cause secondary pollution to water quality. Generally speaking, the water quality can meet the standard before entering the urban pipe network. However, because it is not pure water, it generally contains some metal elements, compounds and microorganisms. When water flows in the pipeline, due to the separation of chemicals, the falling off of the coating material of the soft seal gate valve pipeline, the attenuation of residual chlorine and other reasons, the water and the material of the inner wall of the pipe have a chemical effect.

對于軟密封閘閥的漏氣方式，常見的有以下幾種：

For the air leakage mode of soft seal gate valve, the following are common:

1、汽缸上的電磁閥漏氣，可能是由于減壓閥中的氣壓過高。

1. The air leakage of the solenoid valve on the cylinder may be due to the high air pressure in the pressure reducing valve.

2、汽缸的排氣孔漏氣，這是因為汽缸內部的兩個活動部件與缸體的密封處的密封圈出現老化現象。

2. The exhaust hole of the cylinder leaks because the two moving parts inside the cylinder and the sealing ring at the sealing part of the cylinder block are aging.

3、汽缸的上下部漏氣，這是由于執行機構與氣缸的密封處的密封圈由于其執行機構的頻繁活動而沒有達到密封的效果。

3. The upper and lower parts of the cylinder leak, which is because the sealing ring at the seal between the actuator and the cylinder does not achieve the sealing effect due to the frequent activities of the actuator.

4、除上面的3種情況以外，還有另外一種情況也可能使汽缸漏氣，即汽缸中的彈簧損壞，由于力到不到位造成的，這也可能造成關不到位。

4. In addition to the above three cases, there is another case that may also cause air leakage of the cylinder, that is, the spring in the cylinder is damaged, which is caused by the force not in place, which may also cause the closing not in place.

解決汽缸漏氣問題時相應要在根據實際的情況來考慮，比如說軟密封閘閥是氣開的，還是氣關的。對于氣開的閥，我們首先可以關閉其兩端的手閥，然后讓中控將此閥打開，先將連接處的連接片拆開，然后將氣源切斷，此時將減壓閥處的氣體放掉，注意這時的執行機構將轉動90℃，之后換好以后相應要注意將執行機構的搬回到原來的位置。

When solving the problem of cylinder air leakage, it should be considered according to the actual situation. For example, whether the soft seal gate valve is gas open or gas closed. For the air open valve, we can first close the hand valves at both ends, and then let the central control open the valve. First disassemble the connecting piece at the connection, and then cut off the air source. At this time, release the gas at the pressure reducing valve. Note that the actuator will rotate 90 ℃, and then change it. After that, pay attention to moving the actuator back to the original position.

軟密封閘閥小于等于DN500時，啟閉循環次數不少于500次，電動閥不少于2500次。大于DN500時，啟閉循環次數酌減。軟密封閘閥的操作性能和密封試驗，都應在規定的操作扭矩或操作力下進行。除常規的強度、密封、操作功能、尺寸、材料、低壓試驗等檢測項目外，還須檢測防護性的環氧涂層。當軟密封閘閥用于飲用水時，還須進行衛生評價或第三方認證。

When the soft seal gate valve is less than or equal to DN500, the number of opening and closing cycles shall not be less than 500, and that of electric valve shall not be less than 2500. When it is greater than DN500, the number of opening and closing cycles shall be reduced. The operating performance and sealing test of soft seal gate valve shall be carried out under the specified operating torque or force. In addition to the conventional test items such as strength, sealing, operation function, size, material and low pressure test, the protective epoxy coating must also be tested. When the soft seal gate valve is used for drinking water, it must also be subject to sanitary evaluation or third-party certification.