Differential pressure indicators
AssigneeFawcett Engineering Limited
InventorBrian Read
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Abstract
A differential pressure indicator for indicating the degree of contamination of a filter element, has a piston movable against a spring by increasing differential pressure and the piston is connected through a helical constraint to turn a magnetic element as the piston moves. An indicator element is located on the opposite side of a wall from the magnetic element and is magnetically coupled to it and is thereby turned by the first element as the latter turns.
Claims5
A differential pressure indicator including a piston mounted for sliding movement in a bore, the differential pressure to be measured being in use supplied across the opposite faces of the piston, and resilient biasing means urging the piston in the direction of decreasing differential pressure, wherein the indicator further comprises an angularly moveable member interconnected with the piston so that movement of the piston in the bore causes angular movement of said member, and angularly moveable indicator element, and a fluid-tight wall between the angularly moveable member and the indicator element, the angularly moveable member and the indicator element being magnetically coupled so that angular movement of the angularly moveable member in response to a change in the differential pressure causes an appropriate angular movement of the indicator element.
Dependencies are inferred from the claim text.