Patent ID: 6918952
Filing Date: 2005-07-19
Classification: B01D,G01N

Abstract:
1. A quick-change filter system comprising: at least one base and at least one quick-change filter, which base is provided with an inlet connecting element and an outlet connecting element for connecting the base to a fluid pipe system, wherein the base is provided with a filter coupling part provided with a gas inlet stub for connection to an inlet of the quick-change filter and with a gas outlet stub for connection to an outlet of the quick-change filter, wherein the quick-change filter is provided with a filter housing, which is at least partly filled with filter material and to which the inlet and the outlet are connected, and with a quick-change coupling arranged for cooperation with the filter coupling part of the base, wherein the quick-change coupling contains the inlet and the outlet of the quick-change filter, wherein the base is provided with means for manually connecting the quick-change filter to the base, and is provided with sealing means for automatic, gastight sealing of the gas outlet stub and the gas inlet stub when decoupling the quick-change filter from the base, wherein the base is also provided with a by-pass pipe and with means for creating a fluid connection between the inlet connecting element and the outlet connecting element via the by-pass pipe when a quick-change filter is decoupled from the base and for closing off this fluid connection when a quick-change filter is placed on the base, wherein the means for creating and for closing off a fluid connection comprises a pin which is longitudinally adjustable in relation to the base, which pin is provided with a first and a second sealing face, wherein the base contains a first and a second valve seat, wherein, in a first position, the pin lies with the first sealing face against the first valve seat and thus forms a block in a fluid connection between the gas inlet stub and the inlet connecting element while a fluid connection is present between the inlet connecting element and the by-pass pipe, wherein, in a second position, the pin lies with the second sealing face against the second valve seat and thus forms a block in a fluid connection between the by-pass pipe and the inlet connecting element while a fluid connection is present between the gas inlet stub and the inlet connecting element, and wherein the flow resistance of the gas inlet stub is larger than the flow resistance of the gas outlet stub, such that backflow of gas in the filter housing is prevented.