Fluid handling – Processes – Cleaning – repairing – or assembling
Reexamination Certificate
2005-12-16
2008-03-04
Rivell, John (Department: 3753)
Fluid handling
Processes
Cleaning, repairing, or assembling
C137S315330, C137S469000, C251S118000, C267S180000
Reexamination Certificate
active
07337796
ABSTRACT:
A safety relief valve is provided that comprises a body comprising a chamber therein and an inlet and an outlet, the inlet comprising an inlet valve seat; a disk member closeable on the inlet valve seat; and a mechanism in the body biasing the disk member to rest on the inlet valve seat with a set force such that when the pressure in the inlet exceeds a set pressure resulting from the set force, the disk member is lifted from the inlet valve seat, the mechanism comprising a combination of a coil spring and one or more disk springs stacked in series with the coil spring.A method of preparing a coil spring for use in a pressure relief valve comprises measuring the spring rate of the coil spring and; modifying the spring so as to modify its spring rate to be within ±2% of a desired spring rate.
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Choate Jeremy R.
Easton Michael J.
Taylor Wesley L.
Brinks Hofer Gilson & Lione
Mercer Valve Company, Inc.
Rivell John
Shurtz Steven P.
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