| 摘要 |
A housing having a cylindrical filter element for filtering fluid circulated within a fluid system from a reservoir to a user and including a strainer slidably engaged about a shaft disposed along the axis of the filter. Fluid in such systems normally circulates axially upwardly from the reservoir through the inlet end of the filter and radially through the filter walls to the user. A refill charge of fluid is poured axially downwardly through the cylindrical filter and the filter inlet into the reservoir, in a direction opposite to the normal fluid circulation. The strainer is supported for axial movement in response to the fluid flow from a first position in which the strainer engages a seat formed around the fluid inlet when the reservoir is being refilled so as to trap foreign matter carried therein, to a second position in which the strainer is substantially spaced apart from the filter inlet permitting unrestricted fluid flow between the reservoir and the filter walls during normal fluid circulation.
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