Pressure limiting valve in a hydraulic machine having a...

Details Pressure limiting valve in a hydraulic machine having a... Pressure limiting valve in a hydraulic machine having a...

2007-01-09

2007-01-09

Krishnamurthy, Ramesh (Department: 3753)

Fluid handling

Line condition change responsive valves

Direct response valves

C137S514000, C137S529000, C137S540000, C251S337000

Reexamination Certificate

active

11061006

ABSTRACT:
In the housing1of a hydraulic machine, the pressure Pi acts in the chamber2. For this purpose, a passage opening4is provided, which is formed as a valve seat5. A valve body6can be displaced longitudinally in the housing1and forms a pressure-tight spring chamber for an inner valve spring21. The spring chamber is connected to the chamber2via a pressure equalizing hole9. The prestress of the inner valve spring21can be set by means of a setting screw18. In addition, there is an outer valve spring22. Both the valve springs load the valve body6with the effect of closing it. The pressure equalizing valve described combines a compact design with an advantageous flow characteristic. When a maximum value of p1is reached, the valve body6lifts off the valve seat5and hydraulic fluid from the chamber2flows away via the valve chamber3.

REFERENCES:
patent: 973211 (1910-10-01), Reynolds
patent: 3487852 (1970-01-01), Kikendall
patent: 4194527 (1980-03-01), Schonwald et al.
patent: 4463929 (1984-08-01), Dantlgraber et al.
patent: 5396924 (1995-03-01), Voss
patent: 100 63 153 (2002-06-01), None
patent: WO 2004/033943 (2004-04-01), None

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