Twin sphere union rubber expansion joint is composed of inner and outer rubber, reinforcement layer, vulcanized composite model and parallel metal joints. Wire-fastened rubber joints can also be made of different materials depending on the medium through which they flow.
Simple structure, convenient installation, good shock absorption effect, etc.
The 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.
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.
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.
1. The flexible joints of threaded rubber must be selected according to the working pressure of pipeline, connection mode, medium and compensation amount, and the number of them should be selected according to the requirement of reducing drying displacement.
2 When the installation pipeline produces instantaneous pressure and is larger than the working pressure, the joint with one gear higher than the working pressure should be selected. For example, when the instantaneous pressure of the pipeline is greater than 1.0 MPA, the joint working at 1.6 MPa should be selected. When the instantaneous pressure is greater than 1.6 Mpa, the 2.5 Mpa rubber joint should be selected.
3. When the medium of thread union rubber joint is acid-base, oil, high temperature and other special materials, the joint with one gear higher than the working pressure of pipeline should be selected.
4 Normal medium is ordinary water with temperature of 0-60 C. Special medium such as oil, acid and alkali, high temperature and other corrosive and hard texture should choose corresponding special resistant material, rubber soft connection, not blindly used in tandem or in common use.
| Nominal Diameter （mm） |
LengthLmm | Axial displacement mm | Haorizontal isplacement mm | Angular deflection(a1+a2)° | |||
| mm | inch | A Type | B Type | Extension | Compression | ||
| 15 | 0.5 | 180 | 200 | 5 | 10 | 20 | 45 |
| 20 | 0.75 | 200 | 200 | 5 | 10 | 20 | 45 |
| 25 | 1 | 210 | 200 | 5 | 10 | 20 | 45 |
| 32 | 1.25 | 210 | 200 | 5 | 10 | 20 | 45 |
| 40 | 1.5 | 220 | 200 | 5 | 10 | 20 | 45 |
| 50 | 2 | 220 | 220 | 5 | 10 | 20 | 45 |
| 65 | 2.5 | 240 | 240 | 5 | 10 | 20 | 45 |
| 80 | 3 | 285 | 285 | 5 | 10 | 20 | 45 |
NOTES:
For OEM orders with special requirement, threaded rubber expansion bellows should be made according to customers’ drawings. Thread standard can be ISO, ASME, BS, JIS, etc. Material of rubber body can be NR natural rubber, EPDM, Neoprene, IIR butyl rubber, NBR Buna-N, FKM, etc.
