Which type of break seal connection provides the best leakage control?

The SAE flat face O-ring seal connection is known for providing superior leakage control due to its design features. This type of seal uses a flat face and a compliant O-ring that is compressed between two flat surfaces, creating a reliable and continuous sealing line. The flat surfaces ensure that the load is distributed evenly across the O-ring, which minimizes the likelihood of leaks by maintaining consistent pressure on the gasket material.

Moreover, the design limits the entry of contaminants and enhances the ability to seal under various conditions, including changes in pressure and temperature. The elasticity of the O-ring allows it to adapt to any minor surface imperfections and ensures a tight seal, reducing the probability of leakage over time.

In contrast, the threaded seal connection primarily relies on the mechanical engagement of threads to create a seal which can be affected by misalignment or over-tightening. The flared seal connection uses conical surfaces that can also deform over time, leading to potential leaks, especially under vibration or thermal cycling. Lastly, screw-on seals can vary in performance depending on the quality of the threading and the materials involved, potentially leading to less effective sealing than the precise flat surface and O-ring combination of the SAE design.

This effectiveness in maintaining a tight seal makes the SAE flat face O-ring seal