Patent · US Expired

Filtering device, especially a suction return filter

US6733666B1 · kind B1 · utility

11Cited by

2References

8Claims

0Family size

Assignee

HYDAC FILTERTECHNIK GMBH · DE

Inventors

Werner Wilkendorf · Ottweiler, DE
Holger Wegmann · Sankt Ingbert, DE

Key dates

Filing date	Oct 12, 2001
Grant date	May 11, 2004
Priority date	—
Expiry date	Oct 12, 2021

Classification

Technology area (CPC B)Performing Operations; Transporting
CPC primaryB01D35/153
WIPO fieldChemical engineering
WIPO sectorChemistry

Abstract

A filtering device, especially a suction return filter includes a filter housing having two useful connections and a tank connection, and accommodates at least one filter element. The filter housing also provided with three return valves, two of which are held in the closing position by spring loads. All of the return valves are combined as a module at one end of the filter housing. The remaining return valve is configured as an integral constituent part of one of the spring-loaded return valves, has an opposite opening direction relative to it, and is not spring loaded. This arrangement enables the return valve unit to have a compact arrangement which can be structurally easily connected to the filter housing at a central point.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.