Patent ID: 8114299
Filing Date: 2012-02-14
Classification: B01D

Abstract:
1. A filter comprising a housing having an inlet receiving dirty fluid to be filtered, and an outlet discharging clean filtered fluid, a filter element in said housing filtering said fluid, said filter element having an upstream side receiving fluid along an upstream flow path from said inlet, and a downstream side discharging fluid along a downstream flow path to said outlet said housing having an upstream plenum communicating with said upstream side of said filter element, said housing having a downstream plenum communicating with said downstream side of said filter element a resiliently compressible accumulator occupying substantially the entire volume of said upstream plenum and responsive to a fluid flow surge to compress to a smaller volume and increase remaining fluid volume of said upstream plenum, wherein said accumulator comprises a hollow cushioning envelope filled with a compressible medium, said envelope having a normally expanded condition substantially filling said upstream plenum, said envelope having a contracted condition leaving a remainder volume in said upstream plenum between said housing and said envelope, said envelope shrinking from said normally expanded condition to said contracted condition in response to said fluid flow surge.