The external O-ring size for the G1/2″ flush DMK 331P and DMP 331P is 21×1.5 mm. This O-ring is a crucial sealing component that ensures optimal performance in varying environments. Customers can select O-ring material based on the specific media being measured to ensure compatibility and durability. Common material choices include:
- FKM (Viton): Known for high chemical resistance and performance in high-temperature applications.
- EPDM: Ideal for water and steam applications, offering good resistance to heat, ozone, and weathering.
- NBR (Nitrile): Suitable for applications involving oils, fuels, and other hydrocarbon-based fluids.
- FFKM (Perfluoroelastomer): Provides excellent resistance to extreme chemicals and high temperatures.
The O-ring material’s shore hardness is essential depending on the application’s pressure range. For pressure ranges of 100 bar or less, a Shore hardness of 70 or 75 is recommended to ensure optimal sealing performance without excessive stiffness. For pressures exceeding 100 bar, a Shore hardness of 90 is advised to maintain integrity under higher pressure conditions.
Selecting the appropriate material and hardness will help ensure the longevity and reliability of the O-ring in the specific application.
