D-Rings are rings in the shape of a “D” that offer an alternative sealing solution to O-rings for use in rotary applications. They provide the same sealing properties as O-rings and can, in addition, be used in applications that experience high and low pressures, operating in a wide range of temperatures.
The strength of a seal in rotary applications may be a determining factor when choosing the most suitable seal. In this type of situation, O-Rings can suffer from a tendency to be extruded, which can cause leaks and, in some cases, lead to the failure of the seal. If you wish to avoid this specific risk, a D-Ring is the perfect choice.
D-ring seals can be easily fitted to standard housings. The flat geometry of the base of the “D”-shaped ring avoids the “seal twisting” or rolling, eliminating the possibility of a spiral failure that frequently would otherwise commonly occur when O-rings are used in rotary applications.
In low-pressure applications, the combination of a material with a low modulus and a reduced cross-section helps to reduce friction. In high-pressure applications, in contrast, the friction can be reduced by selecting a higher modulus material with a reduced coefficient of friction.
D-Rings can be manufactured in accordance with DN11851 and are available in a range of materials (NBR, FPM, EPDM Peroxide and VMQ). Since they are aseptic seals, they are designed for sensitive industries, such as the pharmaceutical or food industries, where hygiene is a crucial factor.
View our stock and if you cannot find what you are looking for, get in touch with us.