Filter element with vent orifice and assembly therefore

A filter assembly comprising a housing having a threaded open end, a closed end, and a central axis, a first port to direct fluid into the housing and a second port to direct fluid from the housing, the housing including orientation means integral with an internal surface of the housing and projecting outwardly therefrom;

• a cup-shaped cover with threads adapted to be screwed down onto the threaded open end of the housing, the cover including retaining means internally of the cover;
• and a filter element removably disposed within the housing, the filter element including a ring of filtration media circumscribing a central axis and defining a central cavity, the filtration media ring having a first end and a second end;
• a first, circular end cap at the first end of the media ring, and an annular body portion defining a central opening for receiving a cylindrical component, and an annular seal bounding the central opening of the first end cap for providing a fluid seal with the cylindrical component, a vent orifice in the first end cap into the central cavity of the filter element, disposed radially outward from the seal, and a cooperating orientation means permanently fixed to and integral with the first end cap and projecting outwardly therefrom, the orientation means of the first end cap having a configuration such that the orientation means on the first end cap cooperates with the orientation means in the housing when the element is fully received therein to rotationally orient the filter element with respect to the housing such that the orifice in the first end cap is in a predetermined rotational position relative to the housing;
• and
• a second, circular end cap at the second end of the media ring, the second end cap including retaining means, the retaining means of the second end cap interengaging with the retaining means of the cover to temporarily couple the end cap to the cover when the cover is initially screwed down onto the housing, wherein when the cover is initially screwed down onto the housing, the filter element rotates in conjunction with the cover until the cover is screwed down a predetermined amount, after which the orientation means of the first end cap engages the orientation means of the housing, to rotationally lock the filter element with respect to the housing, the interengagement between the cover and element being such that when the orientation means of the housing and first end cap engage, the cover can thereafter rotate with respect to the filter element as the cover is fully screwed down onto the housing, and when the cover is removed to replace a spent element, the orientation means remaining with the element as the element is removed from the housing.

A filter assembly comprising a housing having a threaded open end, a closed end, and a central axis, a first port to direct fluid into the housing and a second port to direct fluid from the housing, the housing including an orientation device integral with an internal surface of the housing and projecting radially inward therefrom;

• a cup-shaped cover with threads adapted to be screwed down onto the threaded open end of the housing, the cover including a retaining device internally of the cover and projecting radially outwardly therefrom;
• and a filter element removably disposed within the housing, the filter element including a ring of filtration media circumscribing a central axis and defining a central cavity, the filtration media ring having a first end and a second end;
• a first, circular end cap at the first end of the media ring, having an annular body portion defining a central opening for receiving a cylindrical component, and an annular seal bounding the central opening of the first end cap for providing a fluid seal with the cylindrical component, a vent orifice in the first end cap into the central cavity of the filter element, disposed radially outward from the seal, and a cooperating orientation device permanently fixed to and integral with the first end cap and projecting radially outwardly therefrom, the orientation device of the first end cap having a configuration such that the orientation device on the first end cap cooperates with the orientation device in the housing when the element is fully received therein to rotationally orient the filter element with respect to the housing such that the orifice in the first end cap is in a predetermined rotational position relative to the housing;
• and
• a second, circular end cap at the second end of the media ring, a retaining device integral with the second end cap and projecting outwardly therefrom, the retaining device of the second end cap having a configuration such that the retaining device of the second end cap interengages with the retaining device on the cover to temporarily couple the end cap to the cover when the cover is initially screwed down onto the housing, wherein when the cover is initially screwed down onto the housing, the filter element rotates in conjunction with the cover until the cover is screwed down a predetermined amount, after which the orientation device on the first end cap engages the orientation device on the housing, to rotationally lock the filter element with respect to the housing, the interengagement between the cover and element being such that when the orientation device on the housing and first end cap engage, the cover can thereafter rotate with respect to the filter element as the cover is fully screwed down onto the housing.

A filter element, comprising:

• a ring of filtration media circumscribing a central axis and defining a central cavity, the filtration media ring having a first end and a second end;
• a first, circular end cap having an inner surface sealingly bonded to the first end of the media ring, the first end cap including an annular body portion defining a central opening into the central cavity of the media, sealing means bounding the central opening for sealing against a circular collar, an annular locating sleeve radially outwardly spaced from the central opening and projecting outwardly from the annular body portion, a vent orifice in the annular body into the central cavity at a predetermined circumferential location, radially disposed between the sealing means and locating sleeve, and orientation means permanently fixed to and integral with the first end cap and projecting radially outward therefrom for rotationally orienting the filter element within a cylindrical housing, the orientation means remaining with the element when the filter element is removed from the housing;
• and
• a second, circular end cap sealingly bonded to the second end of the media ring, retaining means fixed to and integral with the second end cap and projecting outwardly therefrom for temporarily retaining the element within a cover.