Patent ID: 6601552
Filing Date: 2003-08-05
Classification: F01L,F16K,Y10S

Abstract:
A hydraulically controllable globe valve, comprising:a stem piston capable of being moved from a first end position in a direction of a second end position; a hydraulic spring arrangement connected to a pressure source and for applying a pressure to the stem piston; a pressure control arrangement for maintaining constant the pressure applied by the hydraulic spring arrangement on the stem piston while the stem piston moves from the first end position in the direction of the second end position by connecting the hydraulic spring arrangement to the pressure source during a variable portion of a valve lift operation; a valve housing surrounding the stem piston; a pressure channel, wherein: the stem piston includes a control groove, the pressure control arrangement includes, in order to connect the hydraulic spring arrangement to the pressure source: a first annular space provided in the valve housing and capable of being connected to the pressure source, and a further annular space capable of being connected to the hydraulic spring arrangement via the pressure channel, and the further annular space is connected to the first annular space via the control groove during the variable portion of the valve lift operation; a control line; and a pressure sink, wherein the pressure control arrangement includes a shutoff element arranged according to one of the following arrangements: in order to connect the hydraulic spring arrangement to the pressure source, the shutoff element opens and closes the pressure channel, and the shutoff element is connected hydraulically to the pressure source and the pressure sink at the first end via the control line and is held open during the variable portion of the valve lift operation.