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1. (WO2000062898) FILTERING DEVICE, ESPECIALLY A SUCTION RETURN FILTER

Pub. No.:    WO/2000/062898    International Application No.:    PCT/EP2000/000440
Publication Date: Oct 26, 2000 International Filing Date: Jan 21, 2000
IPC: B01D 29/11
B01D 35/147
F15B 21/04
Applicants: HYDAC FILTERTECHNIK GMBH
WILKENDORF, Werner
WEGMANN, Holger, Erich
Inventors: WILKENDORF, Werner
WEGMANN, Holger, Erich
Title: FILTERING DEVICE, ESPECIALLY A SUCTION RETURN FILTER
Abstract:
The invention relates to a filtering device, especially a suction return filter (10). The device comprises a filter housing (12) which has two useful connections (A, B) and a tank connection (T) and which accommodates at least one filter element (14). Said filter housing is also provided with three return valves (V1, V2, V3), two (V1, V2) of which are held in the closing position with a spring load. According to the invention, all of the return valves (V1, V2, V3) are combined as a module (22) at one end of the filter housing (12) and the return valve (V3), which is configured as an integral constituent part of one of the spring-loaded return valves (V1), has an opposite opening direction to the latter and is not spring loaded. This enables the return valve unit to have a compact arrangement which can be structurally easily connected to the filter housing at a central point.