How does a dry gas seal maintain balance?
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If a factor disrupts this balance, for example when the sealing gap is small, the hydrodynamic pressure generated by the groove increases, pushing the stationary ring away and increasing the gap; as a result, the opening force decreases until the two forces are in equilibrium again. Conversely, if a factor causes the gap between the sealing surfaces to increase, pressure is released between them, which reduces the force required to open them. Under the action of the closing force, the stationary ring moves toward the moving ring, reducing the gap until the forces reach equilibrium again. That’s why some people also refer to dry gas seals as self-balancing seals.
The dry gas seal achieves self-balancing through its structural design. It regulates the sealing gap by relying on the interaction between the hydrodynamic pressure between the sealed end faces and the mechanical spring force (or external pressure). As the sealing gap decreases, the hydrodynamic pressure generated increases; this pressure is sufficient to push the stationary ring away, thereby increasing the gap, until the opening force and the closing force reach equilibrium. Conversely, if the gap is too large, pressure leakage at the sealing surface reduces the opening force, and the closing force (such as spring force) pushes the stationary ring toward the moving ring, thereby reducing the gap until the two forces are balanced again. In this way, the dry gas seal can be automatically adjusted to maintain operational stability. .
It matches what the original poster described, right?
Yes, this friend means the same thing