Importance

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Abstract

A filter comprising a filter head, a canister secured to the filter head and a tubular filter within the canister. The filter head has inlet and outlet ports for connecting into a hydraulic conduit. A first passage normally delivers fluid from the inlet port to the outer cylindrical surface of the tubular filter element. A second passage delivers fluid from the interior of the filter element to the outlet port. The filter head has a sliding element between the inlet and outlet ports. The sliding element is spring biased which bias can be overcome by differential pressure across the filter element. An indicator is associated with said sliding element and extends through the filter head to the exterior thereof. The filter head has a butterfly valve in the second passage. A plunger slidably positioned in said filter head is spring biased to a first position in which it extends into the canister in the space normally occupied by the tubular filter element. A linkage between the butterfly valve and the plunger closes the valve when the plunger is in a first position, and opens the valve when the plunger is forced in a second position by normal placement of a filter element.

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First Claim