Two-stage pressure relief valve
AssigneeBell Helicopter Textron Inc.
InventorsCarlos A. Fenny, Darrel B. Bryan, David P. Schultz
Life of this patent
Estimating the term…
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.
Claims19
A hydraulic system for an aircraft comprising:
- a hydraulic pump for pumping a hydraulic fluid through the hydraulic system at a normal operating pressure;
- a reservoir for holding the hydraulic fluid;
- and
- a two-stage pressure relief valve comprising:
- a first stage for compensating for increases in hydraulic system pressure over the normal operating pressure and up to a selected threshold pressure level;
- and
- a second stage for bringing 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.
A two-stage pressure relief valve for a hydraulic system, comprising:
- a first means for compensating for increases in a hydraulic system pressure over a normal operating pressure and up to a selected threshold pressure level;
- and
- a second means for bringing 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.
A hydraulic system, comprising:
- a hydraulic pump for pumping a hydraulic fluid at a hydraulic system pressure;
- and
- a two-stage pressure relief valve comprising:
- a first means for compensating for increases in the hydraulic system pressure over a normal operating pressure and up to a selected threshold pressure level;
- and
- a second means for bringing 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.
Dependencies are inferred from the claim text.