D-Ring Seals
D-rings are an alternative for O-rings. A D-ring has the same sealing characteristics as an O-ring, but the flat base ensures better stability in the groove. This eliminates the risk of spiral failure, which occurs primarily during assembly and in dynamic applications.
Suitable for
- Light dynamic applications.
- Applications where the sealing solution is subjected to torsion during assembly/operation.
Not suitable for
- High speed dynamic applications.
- Applications where low closing force is required.
Advantages
- Stable sealing solution with high resistance to rolling in dynamic applications.
- High resistance to spiral failure.
- D-rings fit in existing O-ring grooves.
How do D-Rings work?
A D-ring is an elastic part placed between two parts and then squeezed to fill up the gap between the two parts. When the ring is pressurised, it’s forced to “flow” within the groove toward the clearance gap.
The D-ring has a flat surface to prevent twisting during movements. After installation, the ring is slightly compressed to seal at low pressures.
Technical Specifications
Movement type
Static, Light dynamic rotating/reciprocating
Available sizes
Any size available upon request.
Temperature range
NBR: -40° to +108° C
EPDM: -55° to +155° C
FKM: -25° to +204° C
Hardness range
Static: 70 +/-5 Shore
Rotating: 90 Shore
Available materials
NBR, EPDM, FKM, CR, FVMQ, HNBR, FFKM, PU, VMQ
Available compliances
KTW, USP, NSF 51 61, WRC, WRAS, FDA, R67 01
Available standards
DIN11851
D-Ring Types
TYPE DP
Type DP can be used in piston grooves for effective sealing in static to light dynamic applications.
Movement type:
- Static
- Light dynamic rotating/reciprocating
TYPE DR
Type DR can be used in rod housing/grooves for effective sealing in static to light dynamic applications.
Movement type:
- Static
- Light dynamic rotating/reciprocating
TYPE DF
Type DF can be used in flange/face grooves for effictive sealing in static applications
Movement type:
- Static
Materials
| Rubber Material | Characteristics | Specifics | Applications |
|---|---|---|---|
| NBR, XNBR, Nitril Krynac®, Nipol® |
Temperature range:-40° to +108° C |
|
O-rings, Rubber Moulded Parts, light dynamic seals mineral based oil applications. Gaskets in oil and gas applications. General purpose sealing solutions. |
| FKM, Fluorocarbon Viton®, DAI-EL®, Dyneon®, Tecnoflon® |
Temperature range:-25° to +204° C |
|
O-rings and light dynamic seals in fuel applications. General purposes sealing solutions where high chemical resistance is required. |
| FFKM, Perfluoroelastomer Fluorezi®, Chemraz®, Isolast®, Parofluor®, Simriz® |
Temperature range:-30° to +325° C Chemical resistance:••••• |
|
O-rings and rubber moulded parts where extreme temperature and chemical resistance is required, like chemical processing and high temperature fuel applications. |
| EPM, EPDM, Ethylenepropylene Buna EP®, Keltan®, Nordel®, Vistalon® |
Temperature range:-55° to +150° C |
|
Outdoor sealing applications. O-rings and Gaskets in drinking water applications. |
| VMQ, PVMQ, Silicone KE®, Silastic®, Silplus®, Tufel® |
Temperature range:-54° to +232° C |
|
Heat exchanger Gaskets, Hollow O-rings for low pressure applications. |
| FVMQ, Fluorosilicone FE®, Silastic LS® |
Temperature range:-55° to +180° C |
|
Diesel turbocharger and charge air cool hoses, exhaust hangers, wire and cable insulation. |
| FEPM, Tetrafluorethylene Propylene Aflas®, Dyneon BRF®, Viton VTR® |
Temperature range:–20° to 204° C
|
|
O-rings in cooling water applications. Sealing solutions in high temperature steam applications. |
| HNBR, Hydronated Nitrile Therban®, Zetpol® |
Temperature range:-30° to +150° C Chemical resistance:••••• |
|
O-rings, hoses and membranes which require a high abrasion resistance. |
| PU, Polyurethane Adiprene®, Estane®, Millathane®, Morthane®, Pellethane®, Texin®, Vibrathane® |
Temperature range:-50° to +108° C Chemical resistance:•••••
|
|
O-rings and shaft seals in high pressure applications. Sealing solutions in hydraulic cylinders and CO2 Firearms. |
Alternatives for square rings
Lower closing force?
Hollow O-rings
Hollow O-rings are an alternative to D-rings, when low closing force is required.
Better dynamic performance?
X-rings
X-rings, or Quad rings®, are an alternative for D‐rings. X-rings have four lips and therefore they have at least four sealing surfaces. The benefits are: high stability, space for lubricants between the sealing lips
CONTACT FORM
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NewDealSeals B.V.
+31 (0) 226 362 233
Boezemschop 8, 1724 BJ Oudkarspel, The Netherlands