Patent ID: 7565802
Filing Date: 2009-07-28
Classification: A23L,A61L,B30B,Y10T

Abstract:
1. A method of providing a change of pressure between two pressure states: a low pressure state and a high pressure state of at least 4000 bar, in a pressure vessel of a high pressure isostatic pressing device in which a liquid pressure medium is used for generating the pressure, the method comprising the steps of: transferring liquid pressure medium between a first pressure changing device and the pressure vessel, thereby changing the pressure in the pressure vessel from one of said two pressure states to an intermediate pressure state substantially above atmospheric pressure which has a value between the pressures of the two pressure states; and transferring liquid pressure medium between a second pressure changing device and the pressure vessel, thereby changing the pressure in the pressure vessel from said intermediate pressure state to the other one of said two pressure states.