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Pub. No.:    WO/2010/123987    International Application No.:    PCT/US2010/031892
Publication Date: Fri Oct 29 01:59:59 CEST 2010 International Filing Date: Thu Apr 22 01:59:59 CEST 2010
IPC: F16K 11/16
Applicants: ALCOA INC.
WILCOX, Robert, B.
Inventors: WILCOX, Robert, B.
A pressure relief valve (10) having a plurality of selectable, preset relief pressure settings for use in connection with hydraulic equipment. The pressure relief valve includes a manifold (12) and a barrel (14) fastened to the manifold. The manifold includes a chamber (24) that houses a relief valve cartridge assembly, which includes a poppet valve. The barrel includes a plurality of chambers (56,58), each of which houses a separate and distinct relief pressure load adjustment assembly (68), which includes a spring-loaded ball that engages the poppet valve. Each of the assemblies may be independently adjusted and preset to a desirable relief pressure bad setting, which may be different from one another. The barrel is rotated relative to the manifold until the chamber housing the assembly that has the desired preset relief pressure load aligns with the chamber of the manifold, and, in turn, with the poppet valve. (Figure 4)