Patent ID: 8291932
Filing Date: 2012-10-23
Classification: F16K,Y10T

Abstract:
1. A valve means comprising a valve housing, in which an inlet duct for pressure fluid extends, said duct opening into a valve chamber, in which a valve member is urged by spring means in a closed position engaging a valve seat separating the inlet duct from the valve chamber, the valve member being movably disposed between the valve seat and a fluid outlet and opening at a predetermined opening pressure of the pressure fluid present so that pressure fluid arrives by way of an opening cross section at the fluid outlet and flows out from it, the valve means comprising a control duct connected with the inlet duct upstream of the valve chamber, by way of which pressure fluid flows into a control chamber, in which a control member is held clear of a control seat by spring means in an open position, the control chamber being connected by way of a connecting duct with the valve chamber and in which the control member so controls the exit flow of the pressure fluid that the control member is able to be shifted, prior to opening of the valve member at a control pressure below the opening pressure into engagement with its control seat so that the passage of fluid between the control chamber and the valve chamber is shut off and that in the open position of the valve member and during exit flow of the pressure fluid via the valve chamber the control member, upon a fall in pressure below the control pressure, shifts into its open position and the connection duct is opened with the result that pressure fluid can leave via the control chamber, wherein the opening cross section determining the outlet flow rate of the pressure fluid is defined by a gap between the outer wall of the valve member and the inner wall of the valve chamber, and wherein the inner wall of the valve chamber and the outer wall of the valve member are so matched to each other that the valve member may be shifted into a plurality of open positions with differing opening cross sections and may be held in such positions.