Thread rubber expansion joint is composed of inner and outer rubber, reinforcement layer, vulcanized composite model and parallel metal joints.
Download PDFThe union rubber joint is composed of a rubber sphere and two metal parallel looper joints. This kind of soft connection is mainly used for the connection of steel pipe, copper pipe and high pressure. The threads of welded steel pipe are mostly operated by threading machine. For the processing accuracy and surface roughness of threads, we need high pressure pipe. It’s added to the road lathe.
Threaded rubber expansion joint is especially suitable for pipelines with large vibration and frequent change of heat and cold. This product is suitable for medium: sea water, fresh water, cold and hot water, drinking water, domestic sewage, crude oil, fuel oil, lubricating oil, finished oil, air, gas, steam and granular powder. The screw rubber compensating joint of fan coil unit has good comprehensive performance. It is mainly used for upgrading and transporting raw water and sewage, water supply and cooling circulating water of thermal power plant, pipeline transportation of chemical substances in metallurgical industry, condensate water, chemical industry, cooling, dilution in petrochemical industry and long-distance pipelines in other industries. Flexible connection.
The damage of threaded union rubber joints is smaller than that of other rubber joints, however, the reason why he reduced the damage is due to the size of his model. Because of its small size, DN80 can only be used in the manufacture of threaded rubber joints. In terms of pressure resistance, threaded union rubber joints can completely override the pressure in the pipeline, which makes the situation of bursting and flattening of threaded rubber joints much less.
Double sphere union screwed rubber expansion joint is consist of union screwed and double sphere rubber expansion joint, the material of union screwed is usually malleable iron and stainless steel 304, the material of rubber is usually EPDM,Neoprene,NBR and natural rubber, the size is range from DN15 to DN80,namely since from 1/2inch to 3inch, the installation length of union screwed rubber expansion joint is usually 200mm, for DN65, it's 245mm, for DN80,it's 270mm. About working temperature, it's usually -15~+120 celsius degree, working pressure, it's usually PN16, this product is usually used in air conditioning fan coil etc.
| No. | Item | Material |
|---|---|---|
| 1 | Union | Malleable iron (stainless steel 304 is also ok) |
| 2 | Inner and outer layer of rubber | EPDM (Neoprene, NBR, NR is also ok) |
| 3 | Frame | Nylon cord fabric |
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° |
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.
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.
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.
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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