Patent ID: 7337796
Filing Date: 2008-03-04
Classification: F16K,Y10T

Abstract:
1. A method of manufacturing a group of safety relief valves each with a blow-down value of less than about 10%, the group covering a range of set pressures, the method comprising: a) manufacturing multiple bodies, each having a chamber within the body, an inlet and an outlet, the inlet comprising an inlet valve seat; b) fitting a disk member within each of the bodies so as to be closeable on the inlet valve seat within the body; c) obtaining a plurality of coil springs to be used in the group of safety relief valves, each spring having an original spring rate, the original spring rates varying within the plurality of springs; d) measuring the original rate of each spring; e) assembling the valve by placing a given spring within a given body so as to act with an adjustable force on the disk member, the given spring having its original spring rate modified prior to the final assembly of the valve.