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D-Ring Seals

D-Ring seals, designed to put an end to “spiral failure” in rotary applications


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.

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D-Ring Seals, technical data sheet

ProfileMaterialesColorsCheck stock
D-Ring perfilEPDM Peroxide, NBR, VMQ, FPMBlack, blue, translucent

D-Ring seals, advantages

These are some of the most significant advantages of D-Ring seals:

• They provide greater resistance to stress and wear. • They withstand compression. • They have a longer operating life, which reduces costs. • They are easy to install. Furthermore, due to the ‘D’ shape, being higher at the end, the probability of the seal being damaged during installation in a critical area is lower. • The design of the D-ring prevents the seal from being extruded from its housing.
D-RINGS in stock