Fluid handling – Systems – With pump
Reexamination Certificate
2005-06-28
2005-06-28
Hepperle, Stephen M. (Department: 3753)
Fluid handling
Systems
With pump
C137S493400, C137S493600, C137S493900, C137S514300, C417S307000
Reexamination Certificate
active
06910502
ABSTRACT:
A decoupled check-relief valve for use in a hydraulic fluid circuit is provided that has a cylindrical guide housing which travels during the check function of the valve. The cylindrical guide housing has a clearance parameter, allowing for the selection of an optimal check response time. A dampening disk is provided inside the cylindrical guide housing, traveling within the guide during the relief function of the valve. The dampening disk has a separate clearance parameter, allowing for the selection of an optimal dampening capacity and fluid circuit stability. As such, the check and relief clearance parameters are independent of each other to allow both the check and relief functions of the valve to be optimized.
REFERENCES:
patent: 1853391 (1932-04-01), Westman et al.
patent: 2339101 (1944-01-01), Parker
patent: 3861414 (1975-01-01), Peterson, II
patent: 3888280 (1975-06-01), Tartaglia
patent: 4134424 (1979-01-01), Zeyra et al.
patent: 4859155 (1989-08-01), Laqua
patent: 4923602 (1990-05-01), Blood
patent: 5183075 (1993-02-01), Stein
patent: 6286730 (2001-09-01), Amidzich
Hepperle Stephen M.
Sauer-Danfoss Inc.
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