Abstract: A pressure regulating device for high pressure diesel fuel systems includes a pressure sensing element attached directly to a wall adjacent a fuel inlet passageway that generates electrical signals responsive to stresses imposed on the wall by fuel pressure within the fuel inlet passageway. The pressure sensing element includes a semiconductor element that deflects in response to a deflection of a portion of the pressure caused by fuel pressure within fuel inlet passageway. A coil is electrically connected with the pressure sensing element and is configured to generate a magnetic field that moves a magnetic armature to control fuel pressure.

Abstract: The housing has a flexible diaphragm secured over a fluid pressure inlet port in one end thereof, and a cover secured over an opening in the opposite end thereof. A plunger is mounted to reciprocate in the housing between said diaphragm and said cover in response to changes in fluid pressure at the inlet. Secured in the housing beneath the cover is a ceramic chip or substrate, which has a plane surface that extends normal to the axis of the plunger. A spirally shaped resistor element is printed or otherwise formed on the face of the chip, and a conically coiled compression spring is located in the housing between the resistor element and the plunger, and in such manner that its outer convolution at the larger end thereof is engaged with the outer convolution of the spirally shaped resistor element. The smaller end of the spring is connected to the plunger to be reciprocated thereby toward and away from the resistor element.