Double sphere rubber expansion joint with pressure balance ring is special type, comparing with other common rubber expansion joints, it has a pressure balance ring in the middle of two sphere,it can bear bigger pressure, it's much more safe,except the pressure balance ring, it's same with common double sphere rubber expansion joint, size range from DN25 to DN600, namely from 1'' to 24'', working pressure is usually PN16 or PN25, working temperature is usually -15 ~ + 120 celsius degree.
1.Our material comes from regular large factories, with guaranteed quality.
2.Strictly follow the customer's requirements for rubber production, do not replace the raw materials.
3.After vulcanization, there is no outer rubber layer to form a whole. The middle layer is made of polyester cord, all of which are in the shape of mesh. The connecting layer is thick and bears strong pressure.
4.After the production of finished products, we have professional inspectors to carry out the inspection, cut off the burrs, and make the ball smooth.
5.The ball can be labeled with vulcanization label according to the customer's requirements. If you need your own brand, start to customize the mold.
6.If the sphere is of special length, it can also be customized to be wound.
| Size | Pressure | D | D1 | n*d | b | L |
| DN32 | PN16 | 140mm | 100mm | 4*18mm | 14mm | 165mm |
| DN40 | PN16 | 150mm | 110mm | 4*18mm | 16mm | 165mm |
| DN50 | PN16 | 165mm | 125mm | 4*18mm | 18mm | 165mm |
| DN65 | PN16 | 185nm | 145nm | 4*18mm | 18mm | 170mm |
| DN80 | PN16 | 200mm | 160mm | 8*18mm | 20mm | 175mm |
| DN100 | PN16 | 220mm | 180mm | 8*18mm | 20mm | 225mm |
| DN125 | PN16 | 249mm | 210mm | 8*18mm | 21mm | 225mm |
| DN150 | PN16 | 285mm | 240mn | 8*22mm | 22mm | 225mm |
| DN200 | PN16 | 340mm | 295mm | 12*22mm | 24mm | 325mm |
| DN250 | PN16 | 405mn | 355mm | 12*26mm | 26mm | 325mm |
| DN300 | PN16 | 460mm | 410mm | 12*26mm | 26nm | 325mm |
| DN350 | PN16 | 520nm | 470mm | 16*26mm | 28mm | 350mm |
| DN400 | PN16 | 580mm | 525mm | 16*30mm | 30mm | 350mm |
| DN450 | PN16 | 640mm | 585mm | 20*30mm | 32mm | 350mm |
| DN500 | PN16 | 712mm | 650mm | 20*33mm | 36mm | 350mm |
| DN600 | PN16 | 840mm | 770mm | 20*36mm | 40mm | 400mm |
| Type | 1 | 2 | 3 |
| Working pressure | PN10 | PN16 | PN25 |
| Explosion pressure | PN20 | PN30 | PN45 |
| Vacuum degree | 53.3 Kpa | 86.7 kpa | 100 kpa |
| Applicable temperature | -15~+120 celsius degree | ||
| Applicable media | air, compressed air, water, sea water, hot water, oil, acid and alkali etc. |
