Two-stage pressure relief valve

Details Two-stage pressure relief valve Two-stage pressure relief valve

2007-01-23

2007-01-23

Freay, Charles G. (Department: 3746)

Pumps

Three or more cylinders arranged in parallel, radial, or...

Condition responsive fluid control

C417S290000, C417S308000, C091S038000, C060S468000, C137S130000

Reexamination Certificate

active

10736161

ABSTRACT:
A two-stage pressure relief valve for use with hydraulic systems is disclosed. The two-stage pressure relief valve has a first stage that relieves increases in hydraulic system pressure over the normal operating pressure and up to a selected threshold pressure level, and a second stage that brings the hydraulic system pressure down to a selected reduced operating pressure that is below the normal operating pressure in response to increases in the operating pressure over the threshold pressure level.

REFERENCES:
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patent: 4798050 (1989-01-01), Nakamura et al.
patent: 5651665 (1997-07-01), Can et al.
patent: 6718763 (2004-04-01), Maruta et al.
patent: 6755625 (2004-06-01), Breeden

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