MECHANICAL SEAL WITH A BALANCE SHIFT MECHANISM
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United States of America Patent
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app pub date -
Feb 13, 2014
filing date -
Feb 15, 2013
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Abandoned
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Abstract
An O-ring balance shift mechanism is provided in a dry lift-off face mechanical seal to maintain necessary hydraulic closing forces on the seal faces when pressurized from either the inside or outside diameter of the balance shift mechanism to shift the diameter balance of the seal rings radially under reversed pressure conditions. This mechanism includes a shift ring with two O-rings wherein the shift ring is H-shaped or S-shaped in two alternate embodiments. The O-rings are radially spaced from each other and move axially with the shift ring during reverse pressure conditions.
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