Patent ID: 6173729
Filing Date: 2001-01-16
Classification: F17C,Y10T

Abstract:
In a switch-over device, preferably usable for a gas insufflation device using liquid gas, having at least two inflow channels each blockable by a valve and at least one outflow channel for alternate removal of a fluid medium from a plurality of containers, and having a switch-over piston movably mounted in a housing and comprising a base member which has at each end a valve closure member in the form of a body of rotation, this switch-over piston being drive by a pressure difference between the fluid media and connecting one of the inflow channels to the outflow channel in each of two switching positions, and with a working chamber which accommodates the switch-over piston, sealing elements being provided for closing off the inflow channels in a pressure tight manner when the switch-over piston is in the correspondingly closed position and for dividing the working chamber into two portions sealed off from each other, the improvement wherein the switch-over piston and/or the working chamber is constructed so that at least one sealing element can be arranged selectively in different positions, the size of the areas of the switchover piston which are acted upon by the fluid media and determine the switch-over point, being determined by the position of the sealing element.