Importance

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Abstract

A fluid control valve, principally for controlling the flow of fuel to a compression ignition engine, comprises a valve body and a valve member slidable within the body, the valve member co-operating with a seating on the valve body to control the flow of fluid through the valve. A spring urges the valve member into engagement with the seating and in use, the pressure of the fluid entering the valve is arranged to act on the valve member in opposition to the spring so as to lift the valve member off the seating. The valve member and the seating are formed from electrically conductive material and are electrically insulated from each other except when the valve member is engaged with the seating. An electrical terminal extends to the exterior of the valve body and enables the electrical resistance between the valve member and the seating to be measured. The measured electrical resistance provides an indication of movement of the valve member towards and away from the seating.

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First Claim