D-Ring Seals at NewDealSeals
D-Rings, a worthy alternative to conventional O-Rings, offer a unique sealing solution tailored for specific applications. On this page, we’ll explore the exceptional characteristics of D-Rings, highlighting their superior stability, elimination of spiral failure, and suitability for various scenarios.
What Are D-Ring Seals?
D-Rings share the same sealing characteristics as O-Rings, but their distinctive flat base sets them apart. This flat base design plays a pivotal role in enhancing stability within the groove, eliminating the risk of spiral failure—a common concern during assembly and dynamic applications.
How do D-Ring Seals work?
D-Rings function on the same principle as O-rings, serving as elastic components placed between two parts to bridge the gap and create a secure seal. Here’s how they work:
- Gap Filling: When installed, D-Rings are gently compressed to fill the gap between the two parts, creating an initial seal, even at low pressures.
- Pressure-Induced Flow: When subjected to pressure, D-Rings respond by “flowing” within the groove toward the clearance gap. This flow eliminates any gap and ensures a tight, reliable seal.
Advantages of D-Rings:
- Stable Sealing Solution: D-Rings are renowned for their stability in dynamic applications, resisting rolling and maintaining a consistent seal even during movement.
- High Resistance to Spiral Failure: The risk of spiral failure, often encountered during assembly and in dynamic applications, is effectively eliminated with D-Rings.
- Fit in Existing O-Ring Grooves: D-Rings are designed to seamlessly fit into existing O-ring grooves, making them a convenient and practical choice for upgrading sealing solutions.
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
Types D-Rings
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
D-Ring Seals 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 D-Ring Seals
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NewDealSeals B.V.
+31 (0) 226 362 233
Boezemschop 8, Breekland, 1724 BJ Oudkarspel, The Netherlands