Patent ID: 7159613
Filing Date: 2007-01-09
Classification: F15B,F16K,Y10T

Abstract:
1. Pressure limiting valve in a hydraulic machine, having a valve seat ( 5 ) which is fixed to the housing and forms the passage opening ( 4 ), having a valve body ( 6 ) which comprises a valve disc ( 7 ) matched to the valve seat ( 5 ) and a tubular valve stem ( 8 ) with an inner valve spring ( 21 ) located therein and is guided in a bore in the housing of the hydraulic machine such that it can be displaced longitudinally and is sealed off, so that the bore in the housing, together with the valve body ( 6 ) guided therein, forms a pressure-tight spring chamber for the inner valve spring ( 21 ), having an outer valve spring ( 22 ) surrounding the valve stem ( 8 ) on the outside, the two valve springs ( 21 , 22 ) loading the valve body in the direction of the valve seat ( 5 ), having a valve chamber ( 3 ) which extends transversely with respect to the longitudinal axis of the valve body ( 6 ) and which, when the valve body ( 6 ) is lifted off the valve seat ( 5 ), is connected via the flow opening ( 4 ) to the chamber ( 29 ) upstream of the valve seat ( 5 ), and having a hydraulic connection used for pressure equalization between the chamber ( 2 ) upstream of the valve seat ( 5 ) and the pressure-tight spring chamber.