Self-cleaning filter assembly for solenoid-actuated valves

Details Self-cleaning filter assembly for solenoid-actuated valves Self-cleaning filter assembly for solenoid-actuated valves

F - Mech Eng,Light,Heat,Weapons

16

K

137/38, 182/76

F16K 31/00 (2006.01) B01D 25/38 (2006.01) B01D 29/00 (2006.01) B01D 35/04 (2006.01) F16K 31/40 (2006.01)

Patent

CA 1071501

ABSTRACT OF THE DISCLOSURE This invention relates to solenoid-actuated valves of the type having a fluid pressure-operated diaphragm to control opening and closing of the valve, and has particu- lar reference to a new and improved self-cleaning filter assembly for filtering control fluid used to operate the diaphragm. Solenoid-actuated valves of the type having a fluid pressure-actuated diaphragm to control opening and cloning of the valve typically include relatively small bleed passageways which are relatively easily clogged or blocked. Various attempts have heretofore been made at solving the problem of filtering the control fluid, typic- ally by providing filters of various types at the inlet to the control fluid passageways or by providing filters in the control fluid passageways. While this has met with some success, there still remains a problem of the filter element itself becoming clogged or blocked. Thus, there exists a need for a filter assembly which is self-cleaning. The present invention provides a new and improved filter assembly which is self-cleaning each time the valve is opened or closed. The self-cleaning filter assembly filters control fluid previous to its entering the small passage- ways, and comprises a filter element cleaned by a brush each time the valve is opened or closed, thereby to prevent clogging of the filter during use.

275535

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