Specialized in manufacturing compensators, expansion joints, baffle doors

1. Let's start with "non-metallic expansion joint"-what is an oversized non-metallic compensator?

To put it bluntly, the non-metallic compensator is what we often call the non-metallic expansion joint. The industry standard is calledNon-metallic expansion joints (fabric fiber expansion joints)For details, please refer to JB/T 12235-2015. How do you understand the word "oversized"? Usually refers to compensators with rectangular or circular cross-sections with a diameter of more than 1 meter or even larger. For example, the flue duct and desulfurization tower of thermal power plants are used for inlet and outletRectangular non-metallic expansion jointThe diameter is more than 3 meters ×5 meters at every turn. The main body of this type of product is not a metal bellows, but a combination of high-temperature resistant fabric skin, thermal insulation filling layer and metal frame. Its ability to compensate for displacement does not depend on corrugation deformation, but all depends on the flexibility of the skin and the sliding structure of the frame-to put it bluntly, "soft connection".

2. Compared with the metal compensator, what is the advantage?

Metal expansion joints (e.g.Universal corrugated expansion joint) It is indeed reliable on high-pressure and high-temperature steam pipelines, but when faced with high-temperature flue gas and corrosive media (such as wet flue gas after desulfurization), metal bellows are easily corroded or fatigue cracked. The advantages of super-large non-metallic compensators are precisely:

• Corrosion resistance-The fabric skin material is usually fluororubber, silicone rubber or polytetrafluoroethylene coated cloth, which is easy to deal with SO₂ and acid-base droplets;
• Large compensation displacement-It can absorb axial, transverse and angular displacements simultaneously, and does not produce metal fatigue problems;
• Light structure— — Large-size metal expansion joints are not only expensive, but also scary in weight. Only the frame of non-metal models is metal, and the overall weight can be saved by more than half.

Two days ago, I met a cement factory customer. The high-temperature fan pipeline at the end of the kiln was originally usedMetal rectangular expansion jointAfter less than a year of use, the air leaked. After replacing it with a rectangular non-metallic expansion joint, there was no problem for three years. Do you think it's irritating?

3. How to choose the site? Don't step on these pits.

The most common mistake to make when selecting a model is to only look at the caliber regardless of the medium temperature and pressure. The working temperature of super-large non-metallic compensator is generally limited by the skin. Ordinary silicone cloth can withstand the temperature of 150~200℃, and Teflon cloth can reach about 250℃. If it exceeds 250℃, ceramic fiber insulation layer has to be added. In terms of pressure, it basically does not exceed 0.1MPa, so it is only used on low-pressure pipes. In addition, the installation direction is also particular-many construction teams try to save trouble, lock the tie rod or install the guide tube backwards, and as a result, the compensator can't play a role. Remember:The guide tube is to be directed toward that direction of the medium flowThe tie rod nut must be loosened by a certain stroke after installation, otherwise it will be a dead knot. What about that? It is right to pull the skin with your hand after installation, and you can feel the looseness.

4. Which industries can't live without it?

Super-large non-metallic compensators are needed for the pipes in front and behind the boiler flue duct and the desulfurization flue gas baffle door. Although the temperature of the flue gas after desulfurization is only 50~80℃, the humidity is high and it contains acidic condensate, which will soon rot with a metal compensator. It is usually accompanied hereDesulfurization flue gas baffle doorUse it together. Cement industry: kiln tail preheater, dust collector import and export, high temperature (350℃ +), large dust, rectangular non-metallic expansion joint with wear-resistant lining can carry. The sintering machine and pellet shaft furnace flue gas pipeline in the steel industry are similar scenes. In additionDouble hinge expansion joint for air-cooled island vacuum pipelineThese kinds of special custom structures are used occasionally, but that's another way to play.

5. Routine maintenance-don't wait until you miss it.

The weakness of non-metallic compensators is skin aging. Under normal working conditions, the fabric skin can be used for 3~5 years, but if the environment is bad, it may be changed in 2 years. Usually, the inspection should keep an eye on the skin surface for bulging, cracking or leakage marks. If local damage is found, you can use high-temperature repair tape for temporary emergency, but it is best to replace the whole piece. In addition, the frame bolts must be tightened regularly-pipe vibration will cause the bolts to loosen and then the skin will be torn. By the way: Don't forget to remove the insulation cotton in the old skin when replacing it. The new cotton should be compressed evenly, otherwise the compensation amount will be discounted. Don't ask me how I know, anyone who has suffered a loss knows.

Why are non-metallic compensators almost all custom made?

Simply put, the standard is simply not enough. Think about it, the flue gas temperature in the flue of the power station is always five or six hundred degrees, the medium at the tail of the cement kiln is still corrosive, and the pipe sizes at the inlet and outlet of the desulfurization tower are even more varied-round, square and special-shaped. If you look through the JB/T 12235-2015 standard, you will understand that this standard only stipulates technical requirements, test methods and inspection rules, and the size and shape are not limited at all. Therefore, non-metallic compensators (that is, we often call non-metallic expansion joints) are born custom parts.

"Can you buy a spot install?" I said that if you are not afraid of air leakage or short life, you can try it. But to be honest, the on-site flange spacing, medium temperature and displacement all don't match, and the spot stock will have to be scrapped if it can't last a maintenance cycle. Do you think the money was spent unjustly?

What are the key parameters?

Let's talk about the size first-circle, rectangle and special shape can be made. Like this site'sRectangular non-metallic expansion jointIt is specially equipped with rectangular pipes. More flexible material: silicone cloth, fluorine tape and PTFE film can be selected for the fabric fiber layer, and the temperature range is from-40℃ to 1000℃ full coverage. Whether the inner filling layer is ceramic fiber or rock wool depends on the temperature resistance and heat insulation requirements. There is also structural customization: Do you want a deflector? Do you want to bring a flapper door? For example, this site'srubber compensatorAndRubber PTFE compensatorOne is flexible and the other is corrosion-resistant. Where it is used depends on the working conditions.

By the way, stress levels are also key. 0.1MPa is sufficient for normal working conditions, but some vacuum pipes (such as air-cooled islands) need to be usedSpecial hose for vacuumThat kind of sealing structure, otherwise it will deflate when vacuumed.

The customization process is actually four steps

In the first step, you throw over the pipe parameters: diameter, medium, temperature (including long-term operating temperature and instantaneous maximum temperature), pressure, axial/transverse/angular displacement. In the second step, according to the parameter selection, we use the formula to calculate the stiffness and compensation amount-this can't be slapped on the head. Referring to the formula for calculating the stiffness of the expansion joint mentioned in the previous question and answer, we have to use the data to speak. The third step is to make drawings for you to confirm: the number of flange bolt holes, the length of the guide tube and the position of the tie rod are clearly marked. The fourth step is to do pressure test and displacement test before the production leaves the factory to ensure no leakage.

The whole cycle is fast one week, and the slow one is determined according to the complexity. Such as matchingDouble-sealed round flapper doorOrElectric plug-in insulation doorThis kind of assembly will take longer, after all, it needs to be linked to test.

Customizing the three easiest pits to step on

The first pit: only report the temperature but not the instantaneous maximum temperature.There is a customer of a power plant whose flue gas is usually 300℃, so he chose ordinary silicone cloth. As a result, the temperature rushed to 500℃ when starting and stopping, and the silicone cloth directly burned through the end of a pot. Remember that instantaneous temperatures can be twice as high as long-term temperatures, and material selection must be counted as peak values.

The second pit: ignore installation space.The flange spacing at the site is small, the compression amount of the non-metallic compensator is not enough, and it will die when installed, and the displacement will all be converted into pipeline stress, and the weld will crack. Therefore, we must measure the flange spacing before customization to leave a margin for pre-compression.

The third pit: forgetting to consider particulate matter in the medium.If the smoke is dusty, the fabric layer will be worn out quickly. What to do? The guide tube must be thickened or welded with cemented carbide. We have encountered customers in the cement industry who did not add deflectors and changed them twice in three months. Later, it was changed to a guide tube with surfacing layer, which took two and a half years. These problems are particularly common in power station industry and cement industry projects, and we have dealt with them too many times.

How is it used in the industry?

Power station boiler outlet, forHigh temperature axial expansion jointCombined with rectangular non-metallic expansion joint, it absorbs three-way displacement-think about it, when the boiler starts and stops, the pipeline expands thermally, contracts coldly and vibrates, and the metal bellows alone can't bear it at all. The flue gas pipeline at the tail of the rotary kiln in the cement industry has frequent heat exchange, and the fabric fiber expansion joint is the most reliable because of its strong vibration absorption ability. In the desulfurization system,Flue gas baffle doorAndDesulfurization flue gas baffle doorSupporting use-baffle door to isolate smoke, non-metal expansion joint to compensate displacement, both do not delay.

And vacuum pipes, such as air-cooled islands, have to be usedDouble hinge expansion joint for air-cooled island vacuum pipelineThat structure can withstand negative pressure while also absorbing angular displacement. Each industry has its own set of customized logic. To put it bluntly, it is to translate the working condition parameters into materials and structures-the medium temperature determines the fiber layer, the particulate matter determines the guide tube, and the pressure determines the sealing structure.

Do non-metallic compensators support customization? Of course it is supported, and it has to be customized. If anyone tells you to "buy the spot", you have to be more careful-80% of them have never touched the pit of high-temperature dusty pipes.

A non-metallic compensator is a skin? Stop mixing up!

Is a non-metallic compensator a skin? If you go to the maintenance site and ask around, eight out of ten old masters may point to the layer of cloth and say, "Isn't this the skin?" But if you understand it this way, then the procurement and design links will lead to a big mess. Today, let's get this straight.

Find out one thing first: What exactly is a non-metallic compensator?

Start with the product name. Non-metallic compensators, also known asNon-metallic expansion joint、Fabric fiber expansion jointDefinitely not a single layer of fabric. It is a set of multi-layer composite flexible pipeline compensation device, which is specially used to absorb thermal displacement, reduce vibration and noise. To put it bluntly, it is a "system", not a "part". If you just take a skin to replace it, that's called changing the coat, not the compensator.

Two days ago, I met a customer, and urgently called and asked, "Your non-metallic compensator, if the skin is broken, can you only change the cloth?" I said yes, but I have to find out which layer you changed first. He was stunned: "Isn't it just a layer of skin?" – you see, this is the typical misconception.

Take it apart to see the interior

Take a complete non-metallic compensator apart, and you'll find something inside:

• outer layer: Skin (temperature-resistant and corrosion-resistant fabric layer), which is the "skin" that everyone is most familiar with.
• intermediate: Heat insulating cotton, sealing film. Insulating cotton is responsible for blocking high temperature, and sealing film prevents smoke from leaking out.
• inner layer: Wire mesh, flange frame. Wire mesh is used to enhance overall strength, and flanged frames are responsible for hard connections to pipes.

So, the skin is just the outermost layer of "skin", which is equivalent to a coat. There are also cotton-padded jackets, underwear and skeletons inside. When you say a person wears a down jacket, can you say that a down jacket is a person? A truth.

Function of skin and material selection

Temperature, corrosion, aging. Common materials are silicone rubber, fluororubber, PTFE fabric. The material selection must be based on the working conditions:

• Silicone rubber skin: Temperature resistance around 200℃, suitable for general smoke environment.
• Fluorine rubber skin: Temperature resistance 250-300℃, acid and alkali resistance, commonly used in desulfurization system.
• PTFE fabric: Higher temperature resistance, extremely strong corrosion resistance, but also expensive.

However, it is easy to cause problems by changing the skin without changing the overall structure. Take a real case: a power plant only changed the skin, and did not check whether the insulation cotton in the middle was hardened. As a result, after three months of operation, the internal insulation failed, the outer flange was baked and deformed at high temperature, and the whole set of equipment was scrapped. You say it's a pity or not?

Non-Metallic Compensator vs Skin: Don't Confuse It

The compensator is a complete set of components, including the frame, guide tube, insulation cotton, bead, bolts, and so on. The skin is just a replaceable consumable in it. It is true that only the skin can be changed when replacing, but the design selection must be based on the overall performance.

For example, you bought aRectangular non-metallic expansion jointThen its compensation amount, temperature resistance grade and pressure grade are all calculated for the whole structure. Looking at the skin thickness alone (such as 2mm or 3mm), the reference value is limited. Just like buying a car, you can't judge the performance of the whole car just by looking at the tire tread thickness, can you?

Why do people often call it wrong?

Because the repair site often only changes the skin. Over time, everyone thought that "compensator = skin". In addition, many small manufacturers sell skin as a standard product, and writing "skin compensator" on the drawing deepens the misunderstanding.

In fact, we have bothNon-metallic expansion joint (fabric fiber expansion joint)This typical representative, there are alsorubber compensator、Rubber PTFE compensatorAnd other variants, but their core advantages are in multilayer composite structures. Single-layer skin simply can't withstand the high-temperature and high-pressure smoke erosion.

Purchase recommendations

Don't just focus on the thickness and material of the skin, ask these points clearly:

• Insulation thickness: At least 50 mm or more, otherwise the heat bridge effect will burn out the flange.
• Frame Material: Carbon steel or stainless steel? Is the surface anti-corrosion treatment done?
• Installation dimensions: The flange bolt hole distance and the pipe center are high, all of which can't be wrong.

Standard referenceJB/T 12235-2015。 The overall temperature resistance and compensation amount are the key indicators. For example, if your working temperature is 400℃, you can't just look at the nominal 450℃ of the skin and place an order. You have to confirm whether the heat insulation layer and the sealing film can match.

If the next time someone asks "Is a non-metallic compensator a skin?", you can ask him rhetorically: "Then do you think people are clothes?"-this analogy is rough, but not rough.

Is the metal expansion joint model? The answer is yes, and there are enough models to make your scalp tingle. The reason is simple-pipeline working conditions vary widely, and it is simply unrealistic for one model to dominate the world. Temperature, pressure, displacement direction, medium corrosiveness, any variable changes, the required expansion joint has to be replaced. Two days ago, I met a customer and asked, "Is there a universal expansion joint?" I can only tell him: The universal type you want is actually just one of the models, and you have to make the diameter, pressure and wave number clear, otherwise you can't install it.

Classification by structure and compensation mode, which is the most commonly used division method

The axial type expansion joint is specifically responsible for absorbing the thermal expansion and contraction of the pipe along the axis direction. Like the most commonUniversal corrugated expansion jointAnd when the pipe diameter is large and the pressure is highExternal pressure single type axial type expansion joint-This structure can hide the bellows in the external shell, avoid the medium directly washing the wave crest, and is suitable for high temperature steam pipeline. Lateral and angular types deal with lateral displacement and angular deflection.Compound hinge transverse expansion jointThe lateral displacement is absorbed by the cooperation of two sets of hinge groups, and is often used at the corner of L-shaped or Z-shaped pipes. Pressure balanced type (Straight pipe pressure balanced expansion joint、Curved tube pressure balance type expansion joint) can offset the blind plate force generated by internal pressure, and is suitable for high-pressure large-diameter pipelines, such as the main steam pipeline of power plants. Each structure has its applicable scenario-if you choose the wrong one and install it, it will either be broken or leaked. Think about it, if a DN600 steam pipe is incorrectly installed with an axial type without pressure balance, the blind plate force can push the fixing bracket down.

More targeted by application industry and media

The power station industry has dedicatedCorrugated expansion joint for power station industryThe material and fatigue life requirements are according to the DL/T standard; The cement industry has its ownThe metal corrugated expansion joint in cement industry is wear-resistant and high-temperature resistant, and the problem of dust accumulation has to be considered. In the desulfurization system, the flue gas contains sulfide and moisture, and the common metal expansion joint can't bear the corrosion at all, so it has to be usedDesulfurization flue gas baffle doorCooperateNon-metallic expansion joints (fabric fiber expansion joints)。 At high temperatureHigh-temperature axial expansion joint, the working temperature can reach above 800℃, the bellows must use Inconel 625 or GH3030. Large-diameter and thick-wall situations, such as hot air ducts, have to beLarge-diameter thick-walled expansion joint, the wall thickness should be enough, and a guide tube must be added to prevent vortex erosion. And vacuum pipes, like those used for air-cooled island vacuum pipesThe double hinge expansion joint of air-cooled island vacuum pipe, the ordinary model can't bear the negative pressure at all-the bellows will be sucked flat. The standards and material requirements of different industries vary greatly, so don't mix them. Two days ago, a chemical factory used the model selected for the steam pipeline on the acid pipeline, and the result was perforated in two months.

Classified according to special functions and materials, it specializes in treating various "difficult and complicated diseases"

PTFE-lined hoseAndPTFE compensatorSpecially dealing with strong corrosive media-lined with PTFE, it can withstand almost all strong acids and alkalis, but the temperature cannot exceed 200℃.Special hose for vacuumIt has reinforcing ring and special sealing structure, which can ensure that the bellows will not be unstable under negative pressure.The directly buried (fully buried) type expansion joint is directly buried underground, and the shell has been treated with anti-corrosion and waterproof, which is suitable for directly buried heating pipelines without compensation.rubber compensatorAndThe rubber PTFE compensator is good at absorbing vibration and noise-the rubber section can reduce the vibration transmission of the pipeline, and it is most used in the fan inlet and outlet and pump outlet pipelines. These special models are often not found in ordinary selection manuals, so they have to be customized with manufacturers. You said that if a heating pipe buried under the road surface uses an above-ground expansion joint, it will rust through in half a year. Is this the truth?

Then how do you understand the doorway in the model?

General expansion joint models include nominal diameter (DN), pressure class (PN), wave number, material code, connection mode and other information. For example, "DN200 PN1.6 304 8 wave" can basically describe aUniversal corrugated expansion jointCore parameters-diameter 200mm, pressure 1.6MPa, material 304 stainless steel, 8 waves. But don't expect to conquer the world with a string of letters. Manufacturers usually provide detailed size diagrams and technical parameter tables. When selecting a model, check the displacement (axial, transverse and angular), fatigue life (how many cycles can withstand in the design life) and the guide tube design-these are more critical than the model itself. If the guide tube is installed backwards or the material is wrong, the high-speed airflow will directly split the bellows. There is also the adjustment of the tie rod nut, which should be locked before installation and loosened after operation, otherwise it will limit the displacement.

Finally, a suggestion: Don't think about the model yourself

The actual working conditions (medium, temperature, pressure, displacement direction and quantity, connection mode) are sorted out clearly, and directly thrown to professional manufacturers to let them match the most suitable model. After allMetal expansion jointOnce installed wrong, the cost of replacing is much more expensive than buying a new one-you have to stop the pipe, empty it, cut it, and re-weld it, not counting the loss of construction time. Remember, the model is the result, and the working condition is the source. You tell me what medium is going through your pipeline, how high it is, how much pressure it is, which way it goes, how much it moves, and I can tell you to use itCompound hinge transverse type orStraight pipe pressure balanced type. Don't be too troublesome. The more you fear trouble, the easier it is to get into trouble.

1. Where is the gasket hidden in the non-metallic compensator structure?

The non-metallic compensator not only has gaskets, but also the position and selection of gaskets directly determine whether the equipment can be used normally。 Many people get non-metallic compensators (that is, what we often call non-metallic expansion joints and fabric fiber expansion joints), and when they unpack them, they are blinded-why are there no gaskets? Did the manufacturer miss it?

Don't hurry. Instead of lying alone in the case waiting for you to discover, the spacers are hidden on the flanged connection surface. The body of the non-metallic compensator consists of a skin (usually multi-layered composite fiber fabric), thermal insulation cotton, and an internal support frame (such as wire mesh or steel plate). A layer of gasket is usually pre-installed on the flange surface, or a special groove is opened to place the gasket. The function of this layer of gasket is to fill the tiny gap between the flange and the pipe and prevent media leakage. That soft, black or gray strip you see that sticks to the flange is the spacer.

For the convenience of transportation, some manufacturers will make the gasket into a split structure, bag it separately when leaving the factory, and stick it on the spot. At this time, if the workers are sloppy, or the list is not clearly written, there will be the embarrassment of "no gasket". So customers who ask "Do non-metallic compensators have gaskets?", in all likelihood, have encountered this situation.

Second, why do some people say that non-metallic compensators don't need gaskets? It's a pit

I met a customer two days ago, who made hot air ducts, and purchased a batch of rectangular non-metallic expansion joints. Their installation master insisted: "The non-metallic compensator itself is soft, and the flange is tight when pressed, so there is no need for extra gaskets." The result? As soon as the machine is turned on, the air leaks, the hot air whistles out, and the flange surface is still smoking. Later, after checking, there was no rubber pad attached to the flange surface, all by the elasticity of the skin itself.

Alas, this statement is pure pit. The elasticity of the non-metallic skin does provide some sealing compensation, but that is for the thermal expansion and contraction displacement of the pipe, not for the microscopic irregularity of the flange surface. Stainless steel flange will be deformed after welding, only by skin compression, over time, bolt pre-tightening force attenuation, air leakage is inevitable. What's more, some non-metallic expansion joints (such as those used in desulfurization flue gas pipelines) have negative pressure inside, and the flange sealing surface is directly deflated without installing gaskets, and the consequences are more serious.

So don't believe the "no spacers" nonsense. Regular manufacturers, such as the non-metallic expansion joints (fabric fiber expansion joints) provided by us, clearly mark the gasket installation area on the flange surface when they leave the factory, and some even vulcanize the gaskets on the flange.

3. How to choose the gasket material? High temperature, corrosion and low pressure are different

The wrong choice of gasket is more scary than not installing it. Different working conditions, gasket materials are completely two worlds.

• High temperature conditions (> 400℃): For example, flue gas pipelines in power stations and cement industries. Ordinary rubber gasket burns when it goes up, so you have to use ceramic fiber paper gasket or graphite composite gasket. The temperature resistance of ceramic fiber can reach 1200℃, but the texture is brittle, so the tightening force of bolts should be well controlled and cannot be crushed. Graphite gasket has better flexibility, but it is easy to be oxidized, so it is not suitable for strong oxidizing media.
• Corrosive media (acid, alkali, salt spray): For example, the non-metallic compensator behind the desulfurization flue gas baffle door. Gaskets must be resistant to chemical corrosion, commonly used are polytetrafluoroethylene (PTFE) coated gaskets, or PTFE composite gaskets. Note: The PTFE compensator itself has a flange surface seal, but most non-metallic expansion joint flanges still need additional gaskets, so don't get confused.
• Low pressure and normal temperature (: For example, ventilation and dust removal system, ordinary nitrile rubber gasket or asbestos-free compression fiber gasket is enough. Cheap and easy to install, replace if it breaks.

Gasket thickness. Too thick bolts can't be pressed tightly, too thin to fill the depression. Generally, if the flange surface has good flatness, use 1.5-2mm; If the weld is raised, it is recommended to use more than 3mm. Do not use a 1mm standard gasket for one-cut cutting.

4. If the gasket is not placed correctly during installation, the compensator is equivalent to white installation

If the gasket is installed in the wrong position, the displacement function of the compensator will be scrapped directly. For example: Once the field worker attached the gasket to the inner ring side of the non-metallic compensator, that is, the inner side of the skin. As a result, the pressure of the operating medium blew the gasket displaced, blocking the expansion gap of the compensator. The rectangular non-metallic expansion joint was originally designed to compensate ±50mm in the axial direction, but it stuck at 15mm, and the tie rod was bent.

There are three correct ways to do it:

First, the gasket must be attached to the inside of the bolt hole on the flange face, but not into the inner diameter of the pipe. That is to say, the outer diameter of the gasket should be smaller than the distribution circle of the bolt hole, and the inner diameter should be larger than the inner diameter of the pipe. Otherwise, the media will scour the edges of the gasket, resulting in early failure.

Second, for round or rectangular non-metallic expansion joints, if there is a stop groove (groove) on the flange surface, the gasket should be embedded in the groove to prevent lateral slippage. If there is no stop slot, it is recommended to apply a layer of sealant to assist in positioning.

Third, the order of bolt tightening should be particular. Screw diagonally first, afterburn it three times, and the final torque reaches 80% of the design value. Don't screw it to death. The flange frame of the non-metallic compensator is relatively thin, and excessive bolt force will cause the flange to deform, and the gasket will not be compacted.

Since it's so troublesome, why not seal with a monolithic molded flange? Because the non-metallic compensator has to bear multi-directional displacement when working, the connection between the flange and the pipe must be soft and adjustable, but the integral seal ring will limit the displacement. So spacers are the necessary price.

V. Summary: There are gaskets, but it depends on how the manufacturer matches them

Do non-metallic compensators have gaskets?Yes, but there are three situations：

• Most regular manufacturers install gaskets on the flange surface when they leave the factory (or distribute them with accessories);
• In order to save costs, a few low-priced products may not be equipped with gaskets, so customers need to buy them themselves;
• Very few unprofessional installation teams cancel the gaskets on their own, resulting in leaks.

Are flange gaskets standard or optional? What is the material? What is the thickness? Check this article during on-site installation, and don't let a few cents of gaskets pit tens of thousands of yuan of equipment.

By the way, we have both non-metallic expansion joints (fabric fiber expansion joints) and rectangular non-metallic expansion joints in our station, as well as matching rubber compensators, PTFE compensators and other products. If you are unsure about the selection of gaskets, send the working condition parameters directly to technical support, and we will help you set the specifications. After all, do non-metallic compensators have gaskets? The answer is yes, but it is called yes when used correctly.