Browse Prior Art Database

Self Regulating Filter and Valve Assembly

IP.com Disclosure Number: IPCOM000081113D
Original Publication Date: 1974-Apr-01
Included in the Prior Art Database: 2005-Feb-27
Document File: 2 page(s) / 31K

Publishing Venue

IBM

Related People

Herron, TF: AUTHOR [+2]

Abstract

This is a filter in which unused filter volume is progressively exposed as the filter becomes clogged, thereby to provide a substantially constant downstream pressure; the filter preferably being associated with a valve that cuts off flow when clogging has caused the filter to extend to its shut-off limit position.

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Self Regulating Filter and Valve Assembly

This is a filter in which unused filter volume is progressively exposed as the filter becomes clogged, thereby to provide a substantially constant downstream pressure; the filter preferably being associated with a valve that cuts off flow when clogging has caused the filter to extend to its shut-off limit position.

Assembly 1 has a hollow cylindrical housing 2 into an inlet end of which is screw threaded an end cap 3 that supports and is welded to a coaxially aligned hollow cylindrical mandrel 4. An annular filter 5 of sintered metal or foamed plastic is slidably mounted over mandrel 4 and slidably disposed within bore 6 in housing 2. Helical spring 7, which is tapered to provide a constant spring rate, biases disc 8 away from the outlet end of housing 2 and toward contact with the end of mandrel 4. Disc 8 is adhered to the filter 5 but not mandrel 4. Bore 6 has circumferentially spaced, longitudinally extending channels or grooves 9 extending between the end of mandrel 4 and the outlet end of bore 6.

Fluid from inlet 10 flows through mandrel 4, forcing disc 8 rightward out of seated contact with the end of mandrel 4 against the bias of spring 7. This enables fluid to flow through that portion of filter 5 which projects beyond the end of mandrel 4, such flow being around disc 8 and via grooves 9 to outlet 11. Filter 5 will attain an equilibrium position (somewhat to the right of the rest position in which it is shown) whe...