Fluid handling – Line condition change responsive valves – Pop valves
Reexamination Certificate
2006-05-30
2006-05-30
Rivell, John (Department: 3753)
Fluid handling
Line condition change responsive valves
Pop valves
C137S543230, C137S550000
Reexamination Certificate
active
07051756
ABSTRACT:
A pressure relief valve includes a cylindrical poppet having a fluid metering stem. The valve is configured such that the effective surface area of the transverse aspect of the poppet exposed to fluid pressure during a closed valve condition is greater than the effective surface area of the transverse aspect of the poppet exposed to fluid pressure during an open valve condition. This feature creates a narrow spread for cracking to reseat pressure points since the surface area of the poppet available to experience fluid-related pressure is reduced as the valve moves from its closed to open position. While closed, the poppet is exposed to fluid pressure at the axial end face of the stem and at an annular end face portion of the poppet defined by the clearance between the stem and fluid channel. While open, the poppet experiences fluid pressure at the end face of the stem.
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Knuth Randall J.
Rivell John
Tokheim Holding B.V.
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