Patent ID: 6295914
Filing Date: 2001-10-02
Classification: F15B

Abstract:
A pressure intensifier for fluids comprising a piston/cylinder arrangement having a low pressure side with a low pressure connection and a high pressure side with a high pressure connection and a supply connection, further comprising an intensifier piston constructed as a double diameter piston between the low pressure side and the high pressure side, and a control valve including a valve slide member for alternatingly connecting the low pressure connection to a pressure source and a low pressure source, the valve slide member having a first side and a second side, a control line connecting the control valve to the piston/cylinder arrangement, such that pressure in the control line acts on the first side of the valve slide member, wherein the control valve is configured such that a constant force acts on the second side of the valve slide member, with said constant force being generated by said constant pressure in a pressure space and wherein there is no flow through the pressure space to the low pressure connection when said low pressure connection is connected to the pressure source, wherein the control valve further comprises a valve housing, an annular space being defined between the valve slide member and the valve housing, a tank line connected to the low pressure source and a pump line connected to the pressure source being in communication with the annular space, and a cylinder line connected to the low pressure connection being in communication with the annular space between the pump line and the tank line, the valve slide member further comprising a control disc dividing the annular space, wherein, depending on a position of the valve slide member, the control disc is located either between the pump line and the cylinder line or between the cylinder line and the tank line.