Specialized in manufacturing compensators, expansion joints, baffle doors

非金属补偿器上的固定杆到底是干嘛的？别等设备坏了才明白

别看它叫“非金属”，其实骨架和固定件还是离不开金属。那根明晃晃的固定杆，很多人以为是用来吊装或者方便运输的——前两天还有个客户问我，这东西能不能拆了，觉得碍事。拆了？你拆个试试，管道一升温，补偿器直接给你鼓成气球。固定杆的作用，远比你想象的重要。

固定杆的核心任务就一个字：限

限制非金属补偿器在轴向（也就是顺着管道方向）过度拉伸或压缩。非金属圈带本身很软，弹性好，但经不起硬拽。管道热胀冷缩产生位移时，补偿器本该吸收这个位移，但如果位移量超过了设计值，圈带就会被扯裂或者堆褶。固定杆就像一条安全带，告诉你：最多能跑这么远，再往前就危险了。实际上，固定杆两端连接着接管或法兰，通过螺母锁死一个预设的安装长度，保证补偿器在预定的行程范围内工作。

那它跟膨胀节上的拉杆有什么区别？这是个好问题。拉杆通常是用于金属波纹膨胀节（比如我们站里的通用型波纹膨胀节、复式铰链横向型膨胀节），主要作用是承受内压产生的盲板力，防止波纹管被轴向推力压死。而非金属补偿器的固定杆，更多地是承受外部载荷和限制过量位移。材质上，非金属补偿器的固定杆一般采用碳钢或不锈钢，表面防腐处理，毕竟配套的烟气、粉尘环境往往很恶劣——像我们产品列表里那个“烟气挡板门”和“矩型非金属膨胀节”，经常用在脱硫、除尘管道上，腐蚀性气体一冲，杆子要是生锈了，强度下降就出大事。

怎么判断固定杆有没有调好？

我们产品资料里提到过“膨胀节拉杆螺母怎么调整”那个问答，虽然说的是拉杆，但固定杆的调整逻辑类似。核心参数是安装长度——这个长度必须对应补偿器在冷态下的自由长度。比如管道工作温度是300℃，冷态安装时，固定杆要人为压缩或拉伸一定量，留出热位移的余量。你装得太紧，热了没空间伸；装得太松，冷了圈带下垂。很多现场故障，十有八九就是这根杆子的螺母没拧对。

再讲一个真实案例。某水泥厂用的我们“水泥行业金属波纹膨胀节”旁边，并联了一段非金属补偿器，用来吸收垂直方向的位移。现场工人嫌固定杆碍事，私自拆了。结果运行半年，非金属圈带就出现局部撕裂，漏风严重。换一次圈带停工两天，损失几十万。后来工程师一查，就是缺少固定杆导致偏转位移超标。你想想，一根杆子几百块，换圈带几万块，这笔账不算不明白。

最后说句实在话

选型时别光盯着圈带材料、耐温等级，固定杆的设计和材质同样要核对。特别是大尺寸矩型非金属膨胀节，杆子截面、螺纹规格、两端连接耳板的强度，都得算一遍。如果你拿不准，直接看我们站内“非金属膨胀节国家标准JB/T 12235-2015”那一篇，里面关于结构件的要求写得很清楚。有了这根杆子，补偿器才算真正锁住安全底线。

一、非金属补偿器到底用什么材料做的？先说结论：不是所有非金属都怕火

很多人一听到“非金属”三个字，脑子里自动关联“塑料”“橡胶”“易燃”。这个想法得赶紧纠正。非金属补偿器——准确点说，咱们网站上那款非金属膨胀节(织物纤维膨胀节)——主体材料是高强度玻璃纤维布、硅橡胶涂层布、聚四氟乙烯薄膜这些复合层。玻璃纤维本身是A级不燃材料，熔点超过1000℃。真正可能燃烧的是表面的橡胶涂层或者密封用的聚四氟乙烯——但这两样也不是一点就着。硅橡胶属于阻燃材料，离火自熄；聚四氟乙烯（PTFE）几乎不燃，只有在极端高温下才会分解出有毒气体。所以，“非金属补偿器能着火吗？”这个问题的答案，得看它用在哪、温度多少、接触什么介质。你想想，要是材料本身就能烧，那电厂烟道上千度的烟气早就把它点着了，还能用几十年？

二、哪些工况下非金属补偿器确实可能烧起来？别侥幸，这些案例值得看

说真的，非金属补偿器最常见的起火场景是烟气管道。比如脱硫系统、水泥窑尾、电站烟道这些地方。烟气里经常带着未燃尽的火星、油雾或者煤粉。前两天一个水泥厂的客户打电话问：你们那个矩型非金属膨胀节会不会被烧穿？我问他管道里有没有火花，他说电除尘偶尔会打火。这就危险了。织物的表面涂层一旦被高温火花持续灼烧，硅橡胶会碳化，接着玻璃纤维布虽然不烧，但失去了密封性，烟气外漏，温度更高，最后整个补偿器报废。还有一种情况是管道里有易燃介质泄漏，比如化工厂的尾气含苯类蒸汽，碰到高温表面就可能引燃。记住一句话：非金属补偿器本身不是火源，但它是“助燃物的载体”——如果它表面沾了油污、煤焦油，那等于给火提供了燃料。你猜怎么着？很多火灾事故查到最后，都不是补偿器自己烧起来的，而是周围积灰积油被引燃了。

三、厂家是怎么防火的？阻燃涂层、多层结构、外加防爆层

既然有风险，正规厂家肯定有对策。我们做非金属膨胀节时，会根据客户提供的介质温度和成分来选材。对于高温烟气管道（400℃以上），一般会采用“陶瓷纤维布+不锈钢丝网增强层”的结构，陶瓷纤维的耐火温度能到1260℃，直接怼火焰也没事。对于有火花冲击的工况，会在非金属补偿器外层再加一层金属护网或者用金属蒙皮包裹——这其实有点像咱们网站上那个高温轴向型膨胀节的思路，只不过高温轴向型是纯金属的，而非金属的只作为内衬。另外，氟橡胶或者聚四氟乙烯涂层本身就有很好的阻燃性，符合JB/T 12235-2015标准中的防火要求。还有一点：安装的时候要保证补偿器周围不堆积可燃物，比如油抹布、电缆线，这属于现场管理的问题，但很多事故恰恰出在这里。我们经常跟客户说：你买了个防火的补偿器，结果周围堆了一堆煤粉，那跟没买一样。

四、用户最容易踩的坑：把橡胶补偿器和织物补偿器混为一谈

咱们站上产品列表里有橡胶补偿器和橡胶四氟补偿器，也有非金属膨胀节(织物纤维膨胀节)。虽然都归为非金属，但耐温等级差很多。普通橡胶补偿器（比如丁腈橡胶、氯丁橡胶）连续工作温度一般不超120℃，瞬间耐温可能到150℃，超过这个温度橡胶会软化、分解甚至燃烧。而织物纤维膨胀节（非金属膨胀节）的耐温范围通常在200℃~650℃之间，选对了型号还能更高。所以如果用户在低温管道（比如空调水系统）用了织物补偿器，那是大材小用；但如果在300℃的蒸汽管道上用了纯橡胶补偿器，那就是拿命开玩笑。之前有个客户咨询，说他们烟气管道温度才180℃，用了橡胶四氟补偿器，结果半年后烧穿了。一问才知道，管道的实际温度波动峰值到了220℃，橡胶层已经碳化。所以选型时不能只看平均值，得看峰值温度、持续时间、介质是否有火星。是不是这个理？

五、防火从选型开始：收好这三条硬指标

第一，要明确管道的最高工作温度、瞬时超温温度和频率。如果是带火星的烟气，直接跳过橡胶类，选织物纤维补偿器并加金属防爆层。第二，看补偿器有没有阻燃认证。国家标准JB/T 12235-2015对非金属膨胀节的燃烧性能有明确要求，比如氧指数、水平燃烧等级。咱们站上的矩型非金属膨胀节和非金属膨胀节(织物纤维膨胀节)均可按需提供阻燃等级证明。第三，别忽略安装环境。如果补偿器装在户外或者有腐蚀性气体，表面涂层会老化，阻燃性也会下降，需要定期检查和更换。说白了，非金属补偿器能不能着火，决定性因素不是名字里有没有“非金属”，而是你有没有把正确的产品放到正确的位置上。选对了，它能扛住上千度高温；选错了，几十度的油烟都能把它点着。您说，这钱该不该花在选型上？

Let's ask a question first: Why use non-metallic ones if the pipeline is equipped with metal compensators?

Friends who have been in contact with power plants and cement plants know that metal parts can't bear corrosion and dust accumulation in high-temperature flue gas pipelines and desulfurization systems. Although the metal bellows has high strength, it will rust out in a few months when it encounters acidic medium and wet smoke. Non-metallic compensators use fabric fibers, rubber, PTFE and other materials to deal with these "soft knives". This site'sNon-metallic expansion joint (fabric fiber expansion joint)Andrubber compensatorIt is to make up for the shortcomings of metal parts-to put it bluntly, it is to wear a layer of "body armor" on the pipeline.

The structure is actually not complicated

A flexible loop strap, plus flanges, frame and insulation. The band material may be silicone cloth, fluororubber,PTFE (rubber PTFE compensator)。 The key lies in design: how can it be resistant to both temperature and pressure? Generally, multi-layer composite, inner layer insulation, outer layer sealing. Two days ago, a customer asked: YouRectangular non-metallic expansion jointDifference from round? To put it bluntly, rectangles are mainly used in square pipes such as smoke ducts, which have large compensation and convenient installation-and the four corners of rectangular pipes are prone to stress concentration, which can be digested by the flexibility of non-metals.

Function Article 1: Absorb multidimensional displacement

During thermal expansion and contraction, the pipe will expand and contract axially, yaw laterally and even twist angularly. Because of its flexibility, the non-metallic compensator can absorb the displacement in these directions at the same time, and is not afraid of twisting like metal bellows. Like those used in the cement industryMetal Corrugated Expansion Joints in Cement IndustryAlthough it can also be compensated, when encountering large rectangular flues, non-metallic rectangular expansion joints are more cost-saving and easier to maintain. Think about it, when the temperature of a flue dozens of meters long changes, the displacement is often more than ten millimeters or even tens of millimeters, and the metal parts will get stuck directly if they are not properly designed. The non-metallic band is like a "soft joint", which is not afraid of twisting.

Function 2: Carry high temperature, carry corrosion, and reduce noise

The pipeline behind the desulfurization flue gas baffle door of the power plant is not high in temperature, but the acid corrosion is serious, and the metal parts will rust through in a few months. useNon-metallic expansion joints (fabric fiber expansion joints)With PTFE lining, the life can be extended by two or three years. In addition, it has a vibration damping effect-the vibration of the fan is transmitted to the pipeline, and the non-metallic band can eat some energy, and the noise is low. Some data show that under the same working conditions, the non-metallic compensator can reduce the noise of pipeline system by 8~12 dB. Tsk, this thing is easier than a silencer.

Compared with metal compensators, what are the advantages of non-metal?

Low pressure capacity, cannot be used in high pressure steam pipeline. Moreover, non-metallic materials will age, and their life span generally has to be replaced after 3-5 years. What about that? Calculate clearly when selecting: the medium temperature exceeds 600℃ or the pressure exceeds 0.1MPa, and honestly use metal parts orHigh temperature axial expansion joint； Low temperature and low pressure, large diameter, corrosive media, non-metal is the first choice. Is that the truth?

Finally, a reminder of the main points of purchasing

The national standard JB/T 12235-2015 stipulates the technical requirements of non-metallic expansion joints, mainly depending on the material of the ring belt, compensation amount and connection mode. Pay attention to the direction of the guide tube during installation-refer to the Q&AArrow direction of expansion jointThe tie rod nut should be adjusted according to the on-site displacement, and do not screw it (see for detailsHow to adjust the tie rod nut of expansion joint）。 If you are not sure, you can compare this siteUniversal corrugated expansion jointAndRectangular non-metallic expansion jointProduct parameters, or just ask the technology – they have more experience than me.

In summary, the role of a universal non-metallic compensator? It is to solve the "difficult and complicated diseases" that metal compensators can't handle: high-temperature corrosion, multi-dimensional displacement, large-diameter special-shaped pipes, vibration and noise reduction. If you choose the right one, the equipment is worry-free; Wrong choice, post-maintenance is enough for you to drink a pot.

1. What exactly is the "welding non-metallic compensator" you asked? — — Clarify the concept first, don't buy the wrong goods

Two days ago, a purchaser called and asked "welding non-metallic compensator". I was stunned for half a second and asked him: By "welding" do you mean welding a non-metallic compensator to a pipe? Or does it mean that the compensator itself has metal welds? The other end of the line was dumbfounded. This thing is often called a bastard in the industry. Today, let's talk about it all at once.

The so-called "welded non-metallic compensator" actually refers to one with metal connectors (such as flanges or stub) at both ends, which is connected to the pipe by weldingNon-metallic expansion joint— That is what we often sayNon-metallic expansion joint (fabric fiber expansion joint)、rubber compensatorOrRubber PTFE compensator。 Its main body is a non-metallic loop band (fabric, rubber, PTFE, etc.), but the ports are usually made of carbon steel or stainless steel for the purpose of welding. So the name itself is a bit "contradictory", but everyone in the industry knows it: it means "non-metallic compensator with welded structure at the port".

Don't underestimate this definition. I have seen people buy pure rubber joints (looper flanges at both ends) and take them for flue welding. As a result, when they are baked at high temperature, the rubber melts away directly. Is it a waste of cost? So figure out that "welding" refers to the port structure, not the whole product is metal.

Second, according to the structure: rectangular and circular, the welding method is very different, rectangular non-metallic expansion joint is the main force

Rectangular and circular. The welding processes of the two are far from each other, and they can't be installed directly if they are selected incorrectly.

1. Circular welded non-metallic compensator

It is more common in pipeline systems, such as smoke air ducts of power stations and hot air ducts of cement plants. The circular structure bears uniform force, and butt welding or fillet welding is generally used during welding. The common practice of ports is: a section of metal stub (or flange) is welded to the pipe, and the other end of the stub is pressed with a non-metal ring band. Note that the non-metallic loop strip itself cannot be welded directly, so "welding" is actually for a metal connection.

2. Rectangular non-metallic expansion joint-absolute shipment workhorse

If you go to the boiler flue site at a power station, 99% of them use rectangles. Why? Because the rectangular flue has high space utilization rate, it is easy to stick to the wall. The welding method is also special: the metal frame of rectangular non-metallic expansion joint is usually made of angle steel or channel steel, which is welded directly to the flue wall panel. The ring belt is fastened to the frame by platen bolts instead of welding. So "welding" only takes place between the metal frame and the flue.

In order to save costs, some manufacturers make the frame thin, and the deformation after welding is serious, resulting in air leakage due to weak pressure of the ring belt. Therefore, when choosing rectangular non-metallic expansion joints, be sure to ask about the thickness and material of the frame plate, and don't just look at the quotation.

Third, according to the material: fabric fiber, rubber, rubber PTFE, which can be welded firmly?

The material of the non-metallic ring belt determines the temperature resistance, corrosion resistance and sealing performance. Here are three mainstream materials, which you can take according to the working conditions.

• Fabric fiber expansion joint: i.e.Non-metallic expansion joint (fabric fiber expansion joint)。 The main body is made of silicone cloth, glass fiber cloth, ceramic fiber cloth, etc., and the temperature resistance can reach 1200℃ (with heat insulation layer). After the port metal parts are welded, the ring belt is pressed mechanically, which is not directly affected by the welding heat. This is the most used in flue and cement kiln tails of power stations.
• rubber compensator: The material is natural rubber, neoprene or EPDM, and the temperature resistance generally does not exceed 150℃. Note when welding: the rubber ring belt must not be close to the high-temperature welding area. The metal parts must be welded first, and then the rubber ring belt must be installed after cooling. Many on-site accidents are caused by welding slag splashing onto the rubber.
• Rubber PTFE compensator: Lined with PTFE layer and rubber, taking into account both corrosion resistance and elasticity. The temperature resistance is a little higher than that of pure rubber (about 200℃), but it is also afraid of high welding temperature. Generally used in desulfurization systems, the medium contains acidic gas or slurry. The welding requirements are the same as the rubber compensator, and the heat source must be isolated.

What are the welding non-metallic compensators? From the material classification, there are these three mainstreams. But some people will ask: Can you weld PTFE directly? Wake up, the melting point of PTFE is only 327℃, and the welding melts directly. Therefore, as long as it is a "non-metal" loop strip, it must pass through the transition of metal parts before it can be welded.

IV. Practical application scenarios: power station flue, cement hot air, desulfurization system, each choose its own goods

Different scenarios have completely different choice logics. The question "What are the welding non-metallic compensators?" When put on the spot, the answer becomes "You can decide after looking at the working conditions".

Scenario 1: Power station flue (boiler outlet, dust collector inlet)

The medium temperature is generally 300-700℃, containing a small amount of dust. PreferredNon-metallic expansion joint (fabric fiber expansion joint)Rectangular structure, high temperature resistance and can absorb multi-directional displacement. Welding method: The wall thickness of the flue is generally 6-10mm, and the frame should be welded directly. The kerosene penetration inspection should be done in the welding seam. Frequent questions: The insulation layer is not done properly, and the temperature of the external metal frame is too high, which leads to thermal stress cracking of the weld.

Scenario 2: Hot air duct (kiln head, grate cooler) in cement industry

The temperature is higher, reaching above 1000℃, and contains a lot of clinker dust. Fabric fiber expansion joints with thermal insulation must be used, and heat-resistant steel (e.g. 310S) should be selected for metal connections. Preheat during welding and heat preservation after welding to prevent cracks. OurMetal Corrugated Expansion Joints in Cement IndustryAlthough mainstream, it is still more economical to use rectangular non-metallic expansion joints for large-section flues.

Scenario 3: Desulfurization system (FGD import and export)

Low temperature (50-80℃), strong corrosion (SO₂, chloride). Circle belt preferredRubber PTFE compensator, or a rubber compensator lined with PTFE. Metal parts must be coated with anti-corrosion coating or duplex stainless steel. Note when welding: Desulfurization pipelines are often lined with rubber or plastic, and welding heat will destroy the lining, so the welding sequence should be designed well: first welding metal connectors, then fill the lining. This detail is wrong, and the later leak will be repaired until you cry.

Speaking of which, do you still think "welding non-metallic compensators" is an easy multiple choice question? Choose the wrong material, and it will leak after welding; Choose the wrong structure and can't fit it; Choose the wrong scene and scrap it in half a year. Doubling the cost is light, and delaying the construction period is really bad.

Next time you communicate with the manufacturer, just report three parameters directly: temperature, pressure and media composition. Leave the rest to us. Oh, by the way, don't forget to confirm whether the port is welded or flanged-don't be like the brother at the beginning, ask "welding non-metallic compensator" when you open the mouth, but when you buy it back, you find that you don't even have welding parts.

Splash cold water first: The non-metallic compensator itself does not leak water, but this structure leaks water

Give the answer directly —Non-metallic compensator(That is what we often sayNon-metallic expansion joint、Fabric fiber expansion joint) The body will not leak. The reason is very simple. Its main body is a composite layer of fabric and rubber, which is not a dense metal. If it was waterproof by itself, it would have leaked into a fountain.

What really carries the waterproof banner is the internalSealing layerAnd externalskinThe cooperation of. The sealing layer is usually made of fluororubber, silicone rubber or polytetrafluoroethylene film, which is responsible for blocking air and water. The skin (several layers of high-strength fiber cloth plus rubber) provides strength and prevents the sealing layer from bursting by pressure. Once one of the two partners dropped the chain, the water found the seam to drill.

By what waterproofing? Cooperation of sealing layer and skin

TakeNon-metallic expansion joint (fabric fiber expansion joint)In terms of structure, it is generally like this from the inside to the outside: the innermost layer is a corrosion-resistant sealing layer, the middle is a heat insulation layer (such as ceramic fiber felt), and the outer layer is a skin. The sealing layer is like a raincoat, and the skin is like a jacket shell-a hole in the raincoat is useless no matter how waterproof the outside is.

So when you ask "Do non-metallic compensators leak?"The correct answer is: it does not leak itself, but once the sealing layer is aged, damaged or selected incorrectly, what leaks is the peace of mind you bought at a large price.

Dismantling of Water Leakage Case: Rectangular Non-metallic Expansion Joint of Cement Plant Drips in Half a Year

Two days ago, a customer from a cement factory reported that they usedRectangular non-metallic expansion jointInstalled on the kiln tail smoke gas pipeline, it began to drip water in less than half a year. The scene was so anxious that he jumped his feet, thinking it was a product quality problem. As a result, when I removed it, I saw that the sealing layer was full of corrosion holes, but the skin was intact.

What's the problem?

• Flue gas temperature fluctuates year-round: In the design, the silicone rubber sealing layer was selected at 180℃. As a result, the actual operation sometimes rushed to 250℃, and the silicone rubber was directly carbonized and brittle.
• There is condensed acid in the medium: The flue gas contains sulfur, and the temperature drops after shutdown to form sulfurous acid. The ordinary sealing layer can't bear it, and it will perforate in a few months.

This pot really shouldn't be left to the non-metallic compensator-the working conditions were not accurately calculated in the selection stage.

Pits buried in the design and selection stage: temperature, corrosion and pressure, none of them can be missed

No matter how cow the sealing layer is, it is also afraid of "cross-border rape". Three key parameters don't match up, and it is only a matter of time before water leaks:

• Flue gas temperature: Select silicone rubber or perfluorororubber at high temperature, and use EPDM with good aging resistance at low temperature (such as wet chimney after desulfurization). Don't take the general-purpose type to carry the high temperature of 300℃, that is, force the sealing layer to commit suicide.
• Medium corrosivityPolytetrafluoroethylene film or fluororubber sealing layer for acidic gas; Alternative formulation for alkaline or oil mist environments. Customers often ignore the corrosion of condensate and choose an ordinary rubber, which leaks in half a month.
• Pressure rating: Non-metallic compensators are generally used in low-pressure or negative-pressure pipelines, but when the pressure fluctuates greatly, the sealing layer will be "blown and bulged" and then torn. Design with a margin at least 20% higher than the actual pressure.

To put it bluntly, the non-metallic compensator is like a custom suit, and only by measuring the body (working conditions) and tailoring (material selection) can it fit. Buy the ready-made universal model when you come up, and don't shout for the leakage.

The most overlooked details of installation and maintenance

Select the right type, install the hand shake, still leakage. Three details are the hardest hit areas:

Has the tie rod nut been adjusted in place?

Non-metallic expansion joints, usually with tie rods, are used to limit displacement. According to the specification, the tie rod nut should be adjusted to the pre-tensioned or pre-compressed position after installation (see the design drawings for specific data). Many workers screwed to death directly, or didn't adjust it at all. As a result, the skin was torn when the pipe was thermally expanded, and the sealing layer suffered. Refer to our site Q&A"How to adjust the tie rod nut of the expansion joint"It should be divided into two steps: first loosen the nut to the free state, and then adjust the positioning nut according to the compensation amount.

Is the deflector in the right direction?

Non-metallic compensator with guide tube, the arrow must point to the direction of media flow. When installed backwards, the airflow directly washes the edge of the sealing layer, and the wear is aggravated. There was once a client who putRectangular non-metallic expansion jointThe guide tube was installed backwards and worn out in three months. We have written about the specific function of the guide tube, and the core is to protect the sealing layer from being damaged by high-speed particulate matter.

Is the bolt torque enough?

The flange bolts can't be tightened, and the water will seep as soon as the sealing surface runs out. But it can't be screwed dead-the strength of non-metallic skin is limited, and the excessive torque of bolts will crush the skin, resulting in local deformation and cracking. The standard practice is to use a torque wrench and tighten it symmetrically three times according to the torque value given by the manufacturer.

What if a non-metallic compensator leaks? Don't be in a hurry to change, check these 4 places first

When you encounter a water leak, don't scold the manufacturer first, and don't rush to place an order for a new one. Sequencing in order:

1. See if the sealing layer is partially damaged: Open the observation port or remove the skin (be careful not to tear it), and check whether there are holes, cracks and bulges on the sealing layer. If it's just a small hole, you can temporarily plug the leak with special repair tape, and then replace it after shutting down.
2. Check if the tie rod nut is loose or stuck: If the tie rod nut is loose and the displacement is uncontrolled, the sealing layer may be torn. Reposition the nut to make sure it is within the set stroke.
3. Verify that the guide tube is detached or installed backwards: The guide tube falls off, and the high-temperature flue gas directly rushes the sealing layer, which can be burned through in a few minutes. Re-fixed or replaced.
4. Measure actual media temperature and composition: Many water leakages are actually due to the change of working conditions-for example, the original burning coal is now mixed with biomass, and the flue gas composition changes, so the sealing layer can't bear it. In this case, the type must be re-selected and the material of the sealing layer must be changed.

80% of the water leakage problems are not the poor quality of the compensator itself, but the hidden pits in the selection, installation and maintenance. After these three links are controlled, the non-metallic compensator will last for three to five years.

By the way, if you still leak after checking, don't hold on. Contact the manufacturer to provide the working condition parameters and let professional technicians recalculate it. It is much cheaper to replace a sealing layer than the entire compensator, and it does not have to move the pipes-this isNon-metallic expansion jointAdvantages of modular design.