Flexible Rubber Elbow

Flexible Rubber Elbow

A flexible rubber elbow is a type of plumbing fitting used to connect and redirect pipes at a 90-degree angle.

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It is designed to provide flexibility and accommodate slight misalignments or movement in the piping system. The rubber material allows for easy installation and provides a secure and leak-free connection.

Advantages

Economy: Compared with the systems of mechanic stretching and material damping, it has the advantages of little space covering, light weight, easy assembly and disassembly, labor saving and low cost. Its smooth inner wall can reduce flow resistance. It has good water tightness, so there is no need of gasket during the installation. It has wide application, large temperature-resistance scope and long working life. (This product can be used for 20 years if it is used indoors. )

Displacement: Flange is free from pipe decentraction and imbalance. Its good flexibility allows compression, extension, distortion, deflection of vertical displacement, etc. Which can prevent the pipeline from damage of deformation and foundation settlement arising from expansion caused by heat and contraction caused by cold.

Shock and noise absorption: The large damping of rubber sphere can effectively buffer and isolate vibration, control and reduce mechanical vibration, and absorb fluid impact noise. The reasonable installation between vibrating machine and metal pipe can decrease structure-borne noise by 15-25 decibels.

Pressure resistance: The multilayered sphere structure can especially endure internal pressure, withstand strong blasting force and impact, and prevent deformation from external pressure. There are many pressure standards on work piece.

Reducibility: After external force compressed, it can recover to original state when this force is removed.

Wide application: Different rubber material and formula can make product possess different resistance to heat, oil, corrosion, age, abrasion and ozone.


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Main data of rubber expansion joint

According to the connection method, there are three kinds of flange type, fixed flange type and thread type; according to the structure, it can be divided into five types: single sphere, double sphere, different diameter body, curved sphere and wind pressure coil. The tubular rubber piece is composed of inner and outer rubber, ply and traveler, and is formed by vulcanization molding and loosening with metal flange or parallel joint. 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.

Nominal diameter(DN) Length
Axial displacement(mm)
Horizontal displacement Deflexion angle
mm inch mm Extension Compression mm (a1+a2)°
32 1 1/4 95 6 9 9 15°
40 1 1/2  95 6 10 9 15°
50 2 105 7 10 10 15°
65 2 1/2 115 7 13 11 15°
80 3 135 8 15 12 15°
100 4 150 10 19 13 15°
125 5 165 12 19 13 15°
150 6 180 12 20 14 15°
200 8 210 16 25 22 15°
250 10 230 16 25 22 15°
300 12 245 16 25 22 15°
350 14 255 16 25 22 15°
400 16 255 16 25 22 15°
450 18 255 16 25 22 15°
500 20 255 16 25 22 15°
600 24 260 16 25 22 15°

Which rubber is used in expansion joints?

Material selection of rubber expansion joints are very variable and depends on the pressure, temperature, fluid etc. parameters. The common materials are, EPDM, IIR, NBR, PTFE and combined with these materials depends of usage area.

Why rubber expansion joints are used?

Rubber expansion joints are used in piping installations to compensate for thermal growth, relieve piping stress during operation, and reduce vibration and noise caused by rotating equipment.

How long do rubber expansion joints last?

The majority of expansion joints can be found off the suction and discharge side of every pump; however, they can also be found near boilers, tanks, cooling towers, heat exchangers and the middle of pipe runs. The average life span of a rubber expansion joint is roughly seven to 10 years.

Can you fill expansion joints with silicone?

Installing expansion joints and using a high-quality silicone-based sealant is one important step you can take to ensure that your work will last for years to come. Expansion joints allow space in which concrete can contract and expand without causing cracks.


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