Relief valve

Details Relief valve Relief valve

2007-01-09

2007-01-09

Krishnamurthy, Ramesh (Department: 3753)

Fluid handling

Line condition change responsive valves

Pilot or servo controlled

C137S492500, C251S118000

Reexamination Certificate

active

10860166

ABSTRACT:
Disclosed is a relief valve, in which a flow rate of hydraulic fluid is not greatly changed even when temperature is changed, and thus providing smooth operation and preventing foreign materials contained in the hydraulic fluid from being introduced into the relief valve. The relief valve is comprised of a sleeve provided with a high-pressure inlet and a tank fluid channel; a main poppet provided with an inflow fluid passage and a back pressure chamber; an annular fluid passage provided on a front end of the main poppet; a seat provided with a seat fluid channel communicating with the back pressure chamber; and a pilot poppet communicating the seat fluid channel with the tank fluid channel.

REFERENCES:
patent: 2827075 (1958-03-01), Mercier
patent: 3100503 (1963-08-01), Tennis
patent: 4351356 (1982-09-01), Koiwai et al.
patent: 4548231 (1985-10-01), Schwede
patent: 4597410 (1986-07-01), Wilke
patent: 6668863 (2003-12-01), Maier
patent: 6745792 (2004-06-01), Koo
patent: 6805155 (2004-10-01), Slawinski et al.

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