Fluid handling – Systems – Sequentially progressive opening or closing of plural valves
Patent
1997-04-14
1998-07-21
Ferensic, Denise L.
Fluid handling
Systems
Sequentially progressive opening or closing of plural valves
1375123, 13751629, 137539, 137540, F16K 1500
Patent
active
057822697
ABSTRACT:
A check valve normally blocks fluid flow from a bore to a passage and includes a spring normally holding a ball in sealing engagement with a valve seat to form a primary metal-to-metal hard seal. Another spring normally holds a poppet in engagement with another valve seat causing an annular protuberance formed on the poppet to sealingly engage a resilient seal to provide a more positive secondary soft seat seal. The poppet is unseated from the valve seat by a stem of a piston prior to the ball being unseated from the valve seat by a guide stem of the poppet so that the soft seal is opened at essentially zero flow conditions.
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Carlberg James R.
Duffy Joseph F.
Harlow Randall A.
Lapke Robert A.
Phillips Joseph T.
Caterpillar Inc.
Ferensic Denise L.
Glastetter Calvin E.
Grant John W.
Kim Joanne Y.
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