Filter with removable filter element and drain mechanism

摘要

The invention provides an element replacement type filter which can prevent an oil from leaking from a drain hole, even in the case that a high pressure is applied to a filter element, and a drain mechanism of the same. A present drain mechanism 7 of the invention corresponds to a drain mechanism which displaces a drain valve 21 on the basis of an operation of a valve opening elastic means (an opening coil spring 22) so as to automatically open the drain hole 11 at a time of canceling an engagement between a cap 2 and a case 3. The drain mechanism is provided with an element supporting body 20 independently provided from the drain valve and supporting a filter element 6 received in a housing 4, and a valve pressing elastic means (a pressing coil spring 23) for energizing the drain valve in a direction of closing a drain hole, in an engaged state between the cap and the case.