Valves and valve actuation – Fluid actuated or retarded – Dashpot or fluid controlled retarder or timer
Reexamination Certificate
2006-05-19
2008-07-01
Fristoe, Jr., John K (Department: 3753)
Valves and valve actuation
Fluid actuated or retarded
Dashpot or fluid controlled retarder or timer
C251S064000, C137S625170
Reexamination Certificate
active
07392972
ABSTRACT:
The ceramic valve structure has a slow-descending device between the valve stick and the valve shaft base. The slow-descending device mentioned herein includes a piston, a piston slot and sealer, and the piston slot is placed on one side of the valve shaft base. A venthole is placed at the bottom of the piston slot, and the bottom of the piston is placed inside the piston slot. The joint of the top of the piston slot is connected to the swing end. The sealer is placed on top of the venthole of the piston. When the valve stick of the ceramic valve is being turned off, it creates a resistance by the slow-descending device, which slows the process of water being tuned off, in turn, slowing down the change in water pressure, reducing damage to the water channel and ceramic valve, and extending a shelf life of the ceramic valve structure.
REFERENCES:
patent: 4112966 (1978-09-01), Carlson
patent: 4723574 (1988-02-01), Bergmann et al.
patent: 4736772 (1988-04-01), Ostertag et al.
patent: 5301716 (1994-04-01), Bergmann
patent: 5413144 (1995-05-01), Riis
patent: 5570720 (1996-11-01), Riis
Egbert Law Offices
Fristoe, Jr. John K
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