초록 ▼

A bi-directional filter has a pair of flapper-type check valve assemblies 20, 21 for directing fluid flow unidirectionally through a centrally supported molded desiccant core 22. Each check valve assembly is a three part structure spot-welded into a unitary assembly having a centering support plate,

A bi-directional filter has a pair of flapper-type check valve assemblies 20, 21 for directing fluid flow unidirectionally through a centrally supported molded desiccant core 22. Each check valve assembly is a three part structure spot-welded into a unitary assembly having a centering support plate, a core support cup and an intermediate flapper valve plate. A depth-type filter media circumferentially surrounds the desiccant core and extends between the check valve assembly on either end of the core for providing filtering for the fluid prior to entering the molded desiccant core. A depth-type filter media 80, 81 is also provided at each axial end of the core for providing fine filtration of the fluid after the fluid has passed through the core. The outer filter media is arranged to allow a portion of fluid therein to bypass the desiccant core.

대표청구항 ▼

[ What is claimed is:] [1.]1. A bidirectional filter drier, comprising:a casing having opposed ends;end caps at said opposed ends,a flow port in each of said end caps,first and second check valve assemblies supported in said casing at said opposed ends, anda molded desiccant core centrally supported

[ What is claimed is:] [1.]1. A bidirectional filter drier, comprising:a casing having opposed ends;end caps at said opposed ends,a flow port in each of said end caps,first and second check valve assemblies supported in said casing at said opposed ends, anda molded desiccant core centrally supported by said valve assemblies, each of said check valve assemblies including a first valve to allow fluid to flow from a respective flow port in an adjacent end cap around the periphery of the desiccant core and radially inward toward the center of the core, and a second valve to allow fluid to flow axially outward from the center of the desiccant core to the flow port in the adjacent end cap, andan outer filter media layer surrounding said desiccant core and extending between said valve assemblies to separate particles in the fluid passing radially inward through the desiccant core, said outer filter media arranged to allow a portion of fluid passing therein to bypass the desiccant core, said outer filter layer having a filtration efficiency at least as great as the desiccant core.