D Ring Seals
D Ring Seals for rotary and reciprocating dynamic applications
M Barnwell Services are the largest independent manufacturer, stockist and distributor of fluid sealing products in the UK. With 50 million D Ring Seals, O Rings and Back-Up Rings in stock we supply to over 5000 customers globally every month – quickly and reliably.
Our range of D Ring Seals can be certified to FDA, EC1935/2004 & EC2023/2006 Regulations, and 3-A Standards grades. Materials include Nitrile (NBR), Hydrogenated Nitrile (HNBR), Viton® (FKM/FPM), Perfluoroelastomer (FFKM), Ethylene Propylene (EPDM) and Silicone (VMQ). Full documentation and certificates can be provided.
M Barnwell Services can also provide D Ring Seals to suit DIN11851 fittings.
D shaped rubber seals present alternative elastomer solution to O Rings for use in rotary and reciprocating dynamic applications. They present identical sealing features as an O Ring. For high and low-pressure applications through a wide span of temperatures, D Rings are ideal.
D rings can usually be, therefore, retrofitted into existing O Ring groove, the size is frequently established around the original O ring dimensions. The flat surface on the foundation of the D Ring ceases the seal from rotating and twisting, averting spiral failure frequently observed when O Rings are used in reciprocating applications. D Rings can be produced to typical O Ring sizes also as bespoke sizes for a particular application.
A collaboration of a low modulus material and small cross-section can assist to decrease friction in low-pressure applications. Selecting a higher modulus material with a lowered ratio of friction can decrease friction in high-pressure applications.
The table below shows a list of common DN sizes:
No limitation to dimensions with over 10,000 different sizes available from stock. DIN Sizes available
Nitrile (NBR), Viton® (FKM/FPM), Ethylene propylene (EPDM), EnDura™ (Steam Resistant), Silicone (VMQ), Fluorosilicone (FVMQ), ), Viton® A, Viton® B, Viton® GF, Viton® GLT, Viton® GFLT, Viton® ETP
Perfluoroelastomers (FFKM) including: Perlast™, Perlast Ice™, Simriz™, Gplast®, Kalrez®, Chemraz®, and others
Polyurethane (AU), Hydrogenated Nitrile (HNBR), Aflas® (FEPM), Polytetrafluoroethylene (PTFE), Neoprene (CR), Encapsulated (FEP/PFA) Styrene Butadiene (SBR), Anti Explosive Decompression Compounds (AED), Viton Extreme®, Metal Detectable, X-Ray Detectable, & many more.
D Ring shore hardness - range from 40 Shore to 90 Shore.
D Ring colours - A range of different colours available, which subject to minimum production quantities
D Ring installation - Coating to aid lubrication can also be supplied
WRC, WRAS, FDA, EC1935/2004 & EC2023/2006, USP Class VI, 3A Sanitary and many more
Selection Boxes, Splicing Kits & Top-up Bags are available
Bespoke D Ring Kits and selection Boxes are also available