Patent ID: 9086191
Filing Date: 2015-07-21
Classification: F16K,F17D,Y10T

Abstract:
1. A method for avoiding backflow comprising transporting a first liquid under pressure via a transport pipe into a container, the transport pipe including a shut-off device with differential pressure switching and the container being under pressure and containing a second liquid in direct contact with the first liquid with the second liquid being the same as or different from the first liquid, the method further comprising: filling a pressure accumulator with the first liquid up to a predetermined level above a liquid level; providing an inert gas in the transport pipe upstream from the shut-off device in the transport direction and in the pressure accumulator under an excess pressure in an amount relative to the container to be filled, shutting off the shut-off device when there is a pressure drop in the transport pipe, the inert gas providing a positive pressure difference to offset a drop in pressure in the transport pipe to the container over a period which is at least as long as a reaction time of the shut-off device to prevent backflow in the transport pipe during the time period from a detection of a triggering signal for shut-off to complete closing of the shut-off device, the shut-off device having an emptying pipe with an emptying valve.