软密封闸阀是一种经常用于管道水的阀门，由于阀门内的水流会流经该产品阀的管道，所以阀门材质的不同也会影响到内部流水的水质，那具体有什么影响呢？

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?

我国现有软密封闸阀给水管网的管材一般采用钢管、铸铁管，当出厂水具有腐蚀性时或管道使用年限过长时，管道内壁就会腐蚀结垢，另外微生物的繁殖也会导致管道内壁结垢。锈蚀物中含有大量的铁、铅、锌和各种藻类，当管道内水流速度、方向或水压发生突变时，就会造成短时间的水质恶化，出现铁、锰、色度、浊度和指标值的大幅度上升。有研究表明，对于未作防腐处理的金属管道，当年限超过5~10年时，污垢就已达到了恶化水质的程度，对于防腐处理较差的金属管道，3~5年就开始出现腐蚀现象，管道使用年限越长，腐蚀越严重，水质情况越糟糕。

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.

使用金属作为给水管材料会对水质构成二次污染。一般来讲，供水水质在进入城市管网管道之前，都能达到   标准。但因其不是纯净水，普遍含有某些金属元素、化合物以及微生物。当水在管道中流动的时候，由于化学物的分，软密封闸阀管道涂层材料的脱落，余氯衰减等原因，使得水和管内壁的材质发生化学作用。

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.

对于软密封闸阀的漏气方式，常见的有以下几种：

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

1、汽缸上的电磁阀漏气，可能是由于减压阀中的气压过高。

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、汽缸的排气孔漏气，这是因为汽缸内部的两个活动部件与缸体的密封处的密封圈出现老化现象。

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、汽缸的上下部漏气，这是由于执行机构与气缸的密封处的密封圈由于其执行机构的频繁活动而没有达到密封的效果。

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种情况以外，还有另外一种情况也可能使汽缸漏气，即汽缸中的弹簧损坏，由于力到不到位造成的，这也可能造成关不到位。

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.

汽缸漏气问题时相应要在根据实际的情况来考虑，比如说软密封闸阀是气开的，还是气关的。对于气开的阀，我们可以关闭其两端的手阀，然后让中控将此阀打开，先将连接处的连接片拆开，然后将气源切断，此时将减压阀处的气体放掉，注意这时的执行机构将转动90℃，之后换好以后相应要注意将执行机构的搬回到原来的位置。

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.

软密封闸阀小于等于DN500时，启闭循环次数不少于500次，电动阀不少于2500次。大于DN500时，启闭循环次数酌减。软密封闸阀的操作性能和密封试验，都应在规定的操作扭矩或操作力下进行。除常规的强度、密封、操作功能、尺寸、材料、低压试验等检测项目外，还须检测防护性的环氧涂层。当软密封闸阀用于饮用水时，还须进行卫生评价或第三方认证。

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.