Anti-drain fluid filter
AssigneeNavistar International Transporation Corp.
InventorsBruce B. Dombek, Theodore F. Boone
Life of this patent
Estimating the term…
Abstract
A fluid filter, particularly adapted for use in non-vertical header mount arrangements, has an inlet thereinto and an outlet therefrom, both of which are valved to create a closed filter shell upon removal of the filter from the header. The outlet valve is opened by engagement of the filter on a header spud therefor and the inlet valve is opened by pressurized oil being presented thereto.
Claims14
An anti-drain fluid filter adapted to be mounted to a filter header comprising a cylindrical housing having a fluid entrance and a fluid exit, a cylindrical filter element disposed in the housing in a manner dividing the housing into an inlet passage communicating with said entrance and an outlet passage communicating with said exit, a one-way inlet valve disposed at said entrance into said housing to said inlet passage, said inlet valve permitting fluid entry thereinto while preventing the exit of fluid therefrom, and a spring-biased, normally-closed outlet valve disposed adjacent said exit from said filter element and normally preventing fluid flow therefrom, said outlet valve including cooperative means responsive to the configuration of said header for automatically opening said outlet valve upon installation of the filter on said header and establishing a continuous fluid passage from said filter element exit to said header, said outlet valve comprising an elastic diaphragm enclosing the outlet passage and normally abutting an annular shoulder disposed on the opposite side of said diaphragm from said outlet passage in fixed position about said exit from said housing, said diaphragm having openings therethrough which are disposed thereabout in a circular array radially outward of said annular shoulder, and means for displacing said diaphragm from said annular shoulder upon installation of said filter on said header.
In combination with a filter header having a standard centrally disposed tubular mounting spud thereon for attaching a filter thereto, said spud being an exteriorly threaded pipe having a uninterrupted planar axial end surface over which said filter may be threadedly engaged, an anti-drain fluid filter comprising a spin-on housing having a threaded base plate threadedly engaged to said spud and containing a filter element dividing said spin-on housing between an inlet path valved by means of a flapper anti-drainback valve disposed within said housing adjacent said base plate and an outlet passage having a normally-closed outlet valve assembly operatively disposed between said base plate and said filter element within said housing, the normally-closed outlet valve assembly including a valve member which is axially shiftable along said axis between positions in which said valve assembly is open and closed, said valve member being disposed to be moved to said open position by engagement thereof with the header mounting spud during engagement of the falter on said header, said valve member incorporating a permitting fluid flow from said outlet passage into said mounting spud when said valve member is in contact with said spud.
An anti-drain fluid filter adapted to engage a standard mounting spud projecting from a filter header, said spud being an exteriorly threaded tube having a planar axial end surface over which said filter may be engaged, comprising:
- a cylindrical housing having an axis, a closed end, and a base plate permanently attached to and enclosing an opposite end of said housing, said base plate having a threaded central aperture for threadedly engaging said mounting spud and a plurality of inlet apertures radially displaced from said central aperture;
- filter element means disposed within said housing and dividing said housing between an inlet passage extending between an inlet side of said filter element means and said inlet apertures and an outlet passage extending between a side of said filter element means opposite said inlet side and said threaded aperture;
- a flapper valve disposed in said inlet passage within said housing adjacent to and closing said base plate inlet apertures, said flapper valve being movable to an open position upon the presence of fluid pressure at said apertures;
- and
- a normally-closed outlet valve assembly disposed within said housing in said outlet passage, said normally-closed outlet valve assembly including a valve member which is axially shiftable along said axis between a closed position and an open position inwardly displaced into said housing from said closed position, said valve member being disposed to be maintained in said open position by contact of said end surface of said header mounting spud therewith upon engagement of the filter on said header, said valve member incorporating a passage permitting fluid flow from said outlet passage through said base plate aperture upon said valve member being maintained in said open position.
Dependencies are inferred from the claim text.