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A filtering apparatus including a fluid monitoring head and a replaceable filter cartridge removably fastened to said head. The cartridge includes a shut off mechanism for interrupting fluid flow through the cartridge when a predetermined quantity of fluid has been treated by the filter. The fluid m

A filtering apparatus including a fluid monitoring head and a replaceable filter cartridge removably fastened to said head. The cartridge includes a shut off mechanism for interrupting fluid flow through the cartridge when a predetermined quantity of fluid has been treated by the filter. The fluid monitoring head is releasably coupled to the shutoff mechanism when the filter is installed. The shutoff mechanism includes a valve element threadedly carried by a shaft that forms part of a driven member, operatively connected to a drive member forming part of the monitoring head. As the driven member rotates, the valve element is gradually unthreaded until it separates and is driven to a flow interrupting position by a biasing spring. The coupling between the drive and driven members includes apertures on one of the members which are engaged by resilient tongues formed on the other member.

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A filter apparatus comprising: (a) a fluid monitoring assembly defining an inlet for receiving fluid under pressure; (b) a replaceable filter element removably connected to said fluid monitoring assembly and defining a flow path from said inlet to an outlet and further including filtering material f

A filter apparatus comprising: (a) a fluid monitoring assembly defining an inlet for receiving fluid under pressure; (b) a replaceable filter element removably connected to said fluid monitoring assembly and defining a flow path from said inlet to an outlet and further including filtering material for filtering fluid conveyed along said flow path; (c) said fluid monitoring assembly including sensing means responsive to fluid flow into said filter element and operative to provide a signal indicative of the quantity of fluid received at said inlet and delivered to said repalceable filter element; (d) a valve member forming part of said filter element and movable from a first position in which fluid flow is allowed to flow along said flow path substantially unimpeded and a second position at which fluid flow along said flow path is blocked by said valve member; (e) a valve actuating means responsive to said sensing means and operative to cause said valve member to move from said first to said second position upon receiving a predetermined signal from said fluid monitoring assembly; (f) means for releasably coupling said valve actuating means with said fluid monitoring assembly. A method for filtering fluid, comprising the steps of: (a) providing a fluid monitoring head in communication with a source of fluid to be filtered; (b) removably attaching a filter element to said head; (c) monitoring the quantity of fluid conveyed through said filter by a sensing means responsive to fluid flow to said filter element; (d) terminating fluid flow through said filter by blocking a fluid flow path defined by said filter with a blocking means responsive to said sensing means and forming part of said filter when a predetermined quantity of fluid has been conveyed through said filter as measured by said monitoring head.