Fluid handling – Line condition change responsive valves – Direct response valves
Reexamination Certificate
2005-11-01
2005-11-01
Krishnamurthy, Ramesh (Department: 3753)
Fluid handling
Line condition change responsive valves
Direct response valves
C137S512300, C137S514000, C137S628000, C060S468000, C091S038000
Reexamination Certificate
active
06959726
ABSTRACT:
A member that is driven by a hydraulic actuator tends oscillate when fluid flow to the hydraulic actuator is terminated. A pressure relief device reduces that oscillation by connecting first and second first relief valves to the hydraulic actuator. The first relief valve provides a relatively large first relief passage as long as pressure in the hydraulic actuator remains above a threshold. A second relief valve opens a second relief passage at substantially the same threshold pressure and thereafter remains open as long as the pressure remains above another lower threshold. A timer causes the second relief valve to close a given interval of time, if the pressure does not drop below the other lower threshold.
REFERENCES:
patent: 4194365 (1980-03-01), Stoufflet et al.
patent: 4520625 (1985-06-01), Sato et al.
patent: 4586332 (1986-05-01), Schexnayder
patent: 4597410 (1986-07-01), Wilke
patent: 4628690 (1986-12-01), Arai et al.
patent: 4757685 (1988-07-01), Burckhartzmeyer
patent: 5018935 (1991-05-01), Gage
patent: 5025626 (1991-06-01), Crosser et al.
patent: 5048296 (1991-09-01), Sunamura et al.
patent: 6328275 (2001-12-01), Yang et al.
patent: 6474064 (2002-11-01), Heyne et al.
patent: 6532738 (2003-03-01), Sharkness et al.
patent: 6705079 (2004-03-01), Tabor et al.
patent: 2002/0038548 (2002-04-01), Sharkness et al.
Haggerty Sean M.
Jervis Mark J.
Russell Lynn A.
Valenta Robert J.
Haas George E.
HUSCO International Inc.
Krishnamurthy Ramesh
Quarles & Brady LLP
LandOfFree
Valve assembly for attenuating bounce of hydraulically... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Valve assembly for attenuating bounce of hydraulically..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Valve assembly for attenuating bounce of hydraulically... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3488631