What are the materials of rubber expansion joints?

There are several materials of rubber expansion joints: ordinary natural rubber, acid and alkali resistant EPDM rubber, oil-resistant nitrile rubber, high-temperature resistant fluorine rubber, strong acid and alkali resistant PTFE rubber, etc.

Product features: 1. The rubber expansion joint is small in size, light in weight, good in elasticity, and easy to install and maintain.

2. When the rubber expansion joint is installed, it can produce lateral, axial and angular displacement, which is not limited by the non-concentric pipeline and non-parallel flange.

3. When the rubber expansion joint is working, it can reduce the noise of structural transmission and has strong vibration absorption ability.

4. It has the characteristics of high pressure resistance, good elasticity, large displacement, balanced pipeline deviation, vibration absorption, good noise reduction effect, and easy installation.

Installation instructions: 1. Rubber expansion joint products can greatly reduce the vibration and noise of the pipeline system, and can fundamentally solve the problems of interface displacement, axial expansion and misalignment of various pipelines.

2. Rubber expansion joints can be made into acid-resistant, alkali-resistant, corrosion-resistant, oil-resistant, heat-resistant and other varieties according to different materials, and can adapt to a variety of media and environments.

3. The rubber expansion joint material is polar rubber, with good sealing, light weight, convenient installation and maintenance, and long service life, but avoid contact with sharp metal instruments to avoid puncturing the sphere.

4. If the overhead is used, it can be equipped with an elastic bracket, and the bolt should be tightened diagonally during installation.

5. If the pressure of the pipeline is too high, the flanges at both ends should be connected together by limit bolts.

Rubber expansion joints are also known as rubber pipe soft joints, flexible rubber joints, hose joints, flexible joints, flexible rubber joints, flexible rubber soft joints, expansion joints, flexible rubber flexible joints, etc. According to the connection method, it is divided into three types: loose flange type, fixed flange type and threaded type; According to the structure, it can be divided into 5 types: single sphere, double sphere, reducer, curved sphere and air pressure coil. It is composed of inner and outer layers of rubber, cord layer and steel wire ring, which are formed by vulcanization and then combined with metal flanges or parallel joint loose sleeves.

This product can reduce vibration and noise, and can compensate for thermal expansion and contraction caused by temperature changes, and is widely used in various piping systems.

However, many people say that the rubber expansion joint is different, one is the rubber joint as mentioned above, and the other official statement is the rubber expansion joint.

Here are some of the well-known brands recognized in the rubber soft joints industry, which are widely recognized and have a great reputation. While rankings may vary depending on time and market conditions, the following brands are generally considered to be among the top brands in the valve industry:

The following are the top ten domestic first-line valve brand manufacturers in 2022-2023, but for reference only: Suzhou Neway Valve Co., Ltd., Shanghai Guanlong Valve Machinery, Shanghai Qizhong Valve Manufacturing, Sanhua, Su Yan, Shentong, Su Valve, Nanfang, Jiang.

First, the word Yao. The above manufacturers are only estimates and references, and the specific situation may vary or fluctuate at any time due to changes in a series of factors such as changes in the market, the size of the competition pattern, and the stability of product quality. As an indispensable key device in industrial production and civil facilities, the quality and reputation of the valve brand directly affect the satisfaction and trust of users.

These brands are known in the valve industry for their innovative technology, high-quality products and reliability. It is important to note that the market and industry are evolving rapidly, and different rankings may vary depending on time and region. For the most up-to-date ranking information, it is recommended to refer to industry reports, professional organizations or market research data for more detailed and accurate information.

Rubber Expansion Joint Specification Data Sheet:

Nominal diameter dn (mm) length l (mm) axial compression axial tension lateral displacement deflection angle.

32 95 8 4 8 15°40 95 8 5 8 15°50 105 8 5 8 15°65 115 12 6 10 15°80 135 12 6 10 15°100 150 18 10 12 15°125 165 18 10 12 15°150 180 18 10 12 15°200 210 25 14 15 15°250 230 25 14 15 15°300 245 25 14 15 15°350 255 25 15 15 15°400 255 25 15 15 12°450 255 25 15 22 12°500 255 25 16 22 12°600 260 25 16 22 12°700 260 25 16 22 12°800 260 25 16 22 12°900 260 25 16 22 10°1000 260 25 16 22 10°1200 260 26 18 24 10°1400 450 28 20 26 10°1600 500 35 25 30 10°1800 500 35 25 30 10°2000 550 35 25 30 10° Rubber Expansion Joint Purchase Standard.

Since the material cost of rubber expansion joints is higher than that of ordinary rubber, the rubber expansion joints are naturally higher than our general rubber joints. The so-called penny price is worth the goods, and the user must choose the material according to the medium used while choosing the rubber expansion joint. High-quality rubber expansion joints are generally made of styrene-butadiene rubber, and styrene-butadiene rubber is the earliest synthetic rubber.

Because it is developed with reference to natural rubber. Therefore, the performance is very good, and the performance is better than that of natural rubber, and the rest of the rubber expansion joints are defective, or relatively cheap expansion joints, and customers can buy according to this standard!

Rubber expansion joint specification product use instructions:

When rubber expansion joints are used for high-rise water supply, the pipeline must have a fixed support or fixed bracket, otherwise the product should be installed with an anti-pull-off device. The force of the fixed support or bracket must be greater than the axial force, otherwise an anti-pull-off device should also be installed. The medium used can be divided into:

Oil-resistant, high-temperature, acid-alkali, wear-resistant, seawater-resistant, corrosion-resistant and other rubber expansion joints.

As an elastic compensation element, the expansion joint has the advantages of reliable work, good performance and compact structure, and has been widely used in basic engineering fields such as chemical industry, construction, water supply, drainage, petroleum, light and heavy industry, refrigeration, sanitation, water sales and heating, fire protection, electric power, etc., and plays an important role in people's lives.

Expansion joints, also known as compensators, are a flexible structure set on the container shell or pipeline to compensate for the additional stresses caused by temperature differences and mechanical vibrations. Expansion joints are divided into: metal expansion joints and non-metallic expansion joints.

Let's compare the differences in the performance of metal expansion joints and non-metal expansion joints to gain a deeper understanding of expansion joints.

1.Compensation function.

Under the same form factor, the compensation function of non-metallic expansion joints is much larger than that of metal expansion joints. In particular, for the compensation function of lateral displacement, the compensation function of non-metallic expansion joints is almost an order of magnitude larger than that of metal expansion joints.

2.Compensate for resistance.

An expansion joint is like an elastomer that is resistant when it is contracted or stretched, and metal expansion joints are much more resistant than non-metals. This resistance is too great, which is not good for the system, and will break the surrounding equipment.

3.High temperature and corrosion resistance.

The material of the non-metallic expansion joint not only has good high temperature resistance, but also has acid and alkali resistance. The yield limit of ordinary carbon structural steel is equal to zero in the environment of 600, and the temperature is high and it will oxidize and peel. Carbon steel expansion joints are easy to crack during the working process, and stainless steel expansion joints will have low leakage corrosion in the low temperature environment, and their cost is also considerable.

4.Thermal insulation and energy-saving performance.

The structure of the non-metallic expansion joint itself has thermal insulation properties. However, the metal expansion joint does not have this condition, in order to keep warm, the outer layer of the metal expansion joint is also covered with a layer of thermal insulation.

5.Maintain replacement performance.

Non-metallic expansion joints are maintenance-free during normal service life; Non-metallic expansion joint replacement is much more convenient than metal expansion joint.

These two names refer to the same product.

Characteristics of EPDM rubber expansion joints with EPDM material, (also known as EPDM material) for wear-resistant and acid-alkali resistant rubber expansion joints:Acid and alkali resistance, corrosion resistance, high temperature resistance.

The pH is low, 50 150, and the operating environment can choose EPDM expansion joints.

I hope my answer satisfies you.

Generally, ethylene propylene rubber, neoprene rubber, and nitrile butadiene rubber can be selected if acid and alkali.

Ethylene propylene rubber is no problem, but the rubber formula should be designed reasonably, otherwise there will be swelling in strong acids and alkalis, it is best to be specific to what medium, and the strength of acid and alkali resistance of rubber is directly related to pressure and temperature. . .

Natural rubber: synthetic rubber joints.

Large elasticity, high tensile strength, good wear resistance and drought resistance, operating temperature range: about 60 80 The medium can be water, gas, etc.

EPDM: Acid and alkali resistant rubber expansion joint is the longest general-purpose rubber, characterized by acid and alkali resistance, and the service temperature range is about 50 150. Corresponding products: acid and alkali resistant rubber expansion joints, the medium is: sewage.

The balls of acid and alkali resistant rubber expansion joints include rubber type, vulcanization system, reinforcement system, wood plastic softening system, plasticization softening system, etc. Acid and alkali resistant rubber expansion joint is the most commonly used rubber soft joint for pipe fittings in the world today. It has the advantages of reducing pipeline noise, good sealing, light weight, convenient installation and maintenance, and long service life.

The above information comes from "Songjiang Group".

Rubber expansion joint, also known as rubber joint, is a pipe connection with high elasticity, high air tightness, media resistance and weather resistance. Henan Guomao pipeline equipment sound field of rubber expansion joint, it is composed of inner and outer layer of glue, cord layer and steel wire ring of the pipe stool-like rubber parts, is after high temperature and high pressure vulcanization molding, and then combined with the gold file hall travel flange or parallel joint loose sleeve. This product takes advantage of the advantages of rubber, such as high elasticity, high air tightness, media resistance, weather resistance, and radiation resistance, and can reduce vibration and noise in pipes, and can compensate for thermal expansion and contraction caused by temperature changes.

It is mainly used in: chemical industry, construction, water supply, drainage, petroleum, light and heavy industry, refrigeration, sanitation, plumbing, fire protection, electric power and other basic projects. If this product is classified according to the use performance, it can be divided into three categories: general, special and heat-resistant.

The rubber expansion joint is generally composed of a smooth corrugated compensation element chain slag piece with a rubber flange at the quiet end of the two sheds and a metal flange. The metal flange often adopts the loose town collapse structure.

Rubber expansion joints are generally composed of smooth corrugated compensating elements with rubber flanges at both ends and metal flanges. Metal flanges often adopt loose sleeve structure.

The surface of the waveform compensation element is rubber, and the inner layer is a sandwich reinforced with several layers of strong fibers or steel strip (wire). The reinforcing interlayer such as reinforcing fiber or steel belt (wire) extends to the glue-like flange at both ends, and there is a hard steel wire skeleton in the flange. The expansion joint has a large displacement compensation ability, which can compensate for axial, lateral and angular displacement, and has the ability to reduce noise, reduce vibration and have a certain anti-corrosion ability.

It has the characteristics of high pressure resistance, good elasticity, large displacement, good vibration absorption and noise reduction effect, easy installation, etc., and can be widely used in water supply and drainage, HVAC, fire protection, compressor, papermaking, shipbuilding, water pump, fan and other pipeline systems.

Content from: Rubber expansion joint (Songjiang Group).

The difference between rubber expansion joints and rubber joints:

1. The expansion joint, also known as the expansion joint, expansion joint, and compensator, is divided into: corrugated compensator, sleeve compensator, rotary compensator, square natural compensator, etc., as well as intubation expansion joint. Among them, corrugated compensator is more commonly used, mainly to ensure the safe operation of the pipeline, and has the following functions:

1.Compensate for the axial, transverse and angular thermal deformation of the absorption pipe. 2.

Absorb equipment vibration and reduce the impact of equipment vibration on pipelines. 3.Absorb the deformation of the pipeline by subsidence.

2. Rubber joints are hollow rubber products used for flexible connection between metal pipes. Soft joints are also called rubber pipe soft joints, rubber joints, rubber soft joints, flexible joints, high-pressure rubber joints, rubber shock absorbers, etc. According to the connection method, it is divided into three types: loose flange type, fixed flange type and threaded type; According to the structure, it can be divided into single sphere, double sphere, curved sphere, etc.

It is composed of inner and outer glue, cord layer and steel cavity hollow wire loop, which is formed by vulcanization and then combined with metal flange or parallel joint loose sleeve. This product can reduce vibration and noise, and can compensate for thermal expansion and contraction caused by temperature changes, and is widely used in various backup piping systems. Rubber fitting is a pipe joint with high elasticity, high air tightness, medium resistance and weather resistance.

The product makes use of the advantages of rubber's elasticity, high air tightness, medium resistance, weather resistance and radiation resistance, and is made of polyester cord fabric with high strength and strong cold and heat stability after being composed with it, and then vulcanized by high-pressure and high-temperature molds. Because the rubber joint has good comprehensive performance, it mainly plays the role of shock absorption, noise reduction and blind noise. Therefore, it is widely used in basic projects such as chemical industry, construction, water supply, drainage, petroleum, light and heavy industry, refrigeration, sanitation, plumbing, fire protection, and electric power.