Relief valve
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United States of America Patent
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-
N/A
Issued Date -
Aug 18, 2005
app pub date -
May 26, 2004
filing date -
Feb 12, 2004
priority date (Note) -
Abandoned
status (Latency Note)
Importance
Abstract
A relief valve, filtering foreign materials contained in hydraulic fluid, is comprised of a sleeve provided with a high-pressure inlet and a tank fluid channel; a main poppet provided with a back-pressure chamber and fitted in the sleeve so as to open/close the high-pressure inlet and the tank fluid channel; a piston provided with a piston fluid passage communicating the high-pressure inlet with the back-pressure chamber; an annular fluid passage defined by an inner wall of the poppet passage of the main poppet and an outer wall of the piston and communicating with the piston fluid passage; a seat fitted in a rear of the main poppet to support a rear end of the main poppet spring and provided with a seat fluid channel; and a pilot poppet fitted to open/close the seat fluid channel, and communicating the seat fluid channel with the tank fluid channel.
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