Cartridge relief valve with improved stability

Details Cartridge relief valve with improved stability Cartridge relief valve with improved stability

2002-11-12

2004-10-19

Scherbel, David A. (Department: 3753)

Fluid handling

Line condition change responsive valves

Pilot or servo controlled

C137S489000, C137S493700, C251S035000

Reexamination Certificate

active

06805155

ABSTRACT:

TECHNICAL FIELD
The invention relates generally to relief valves, and, more particularly, to cartridge relief valves that have a built-in reverse flow check valve structure.
BACKGROUND
Relief valves are generally used to limit the maximum pressure in fluid systems. There are a variety of relief valves available on the market today. However, valve manufacturers are constantly seeking ways to improve the performance of such valves and to lower the amount of money and time it takes to manufacture them.


REFERENCES:
patent: 2989072 (1961-06-01), Banker
patent: 3164166 (1965-01-01), Tennis
patent: 3330298 (1967-07-01), Allen
patent: 3608576 (1971-09-01), Wilhelm
patent: 4351356 (1982-09-01), Koiwai et al.
patent: 4597410 (1986-07-01), Wilke
patent: 5072752 (1991-12-01), Kolchinsky
patent: 5769113 (1998-06-01), Alberts et al.
patent: 1009494 (1965-11-01), None
patent: 56113867 (1981-09-01), None

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