BPG 6903
Properties
Cover Seals are precision pre-formed rings engineered for heavy-duty valves and high-pressure feedwater pre-heaters. They maintain elasticity under fluctuating temperatures and seating stresses up to 200 MPa. Larger gaps can also be reliably managed using BPG graphite rings reinforced with stainless steel springs or full metal caps, ensuring dependable performance in the most demanding operating conditions. BPG 6903 features an inside angle and two metal caps.
Applications
BPG Cover Seals are engineered for demanding applications including general valves, control valves, boilers, and high-pressure valves.
Availability
BPG Cover Seals are available with a standard density of 1.6 g/cm³, with 99.85 % C-content in nuclear quality and 98 % industrial quality, in a wide range of variations e.g. rectangular, with inside or outside angle, with integrated extrusion protection in form of metal caps. Additional designs available on request.
Operation Parameters
| Temperature | –200°C … +550°C (almost all media and air) -200°C ... +2500°C (inert gas) |
| pH Value | 0 … 14 |
| Pressure | 100 MPa |
Product Specifications
| Media* | Hot water, steam, gases, oils, acids and alkalis. Exceptions: strongly oxidising acids such as sulphuric and nitric acid in high concentrations. |
| Certificates / Approvals | BAM approval |
Benefits
- High level of chemical resistance and thermal stability
- Excellent sealing ability and good elasticity
- Not subject to cold flow, shrinkage or ageing
- BPG 6903 fulfils the purity requirements for seals in nuclear power station valves (content of soluble chlorides < 20 ppm)
- BPG Cover Seals are very adaptable, reliable and maintain their elasticity which offers potential savings in costs and time
Construction
