Abstract: A valve seat for a fuel pressure regulator includes a valve body adapted to be disposed in the fuel pressure regulator and a passageway extending axially through the valve body. The passageway is tapered through the valve body to reduce fluid flow cavitation by limiting expansion of the fuel.

Abstract: A valve seat for a fuel pressure regulator includes a valve body adapted to be disposed in the fuel pressure regulator and a passageway extending axially through the valve body. The passageway is tapered through the valve body to reduce fluid flow cavitation by limiting expansion of the fuel.

Abstract: A fuel pressure regulator includes three major components, a lower housing, a control member comprising an resilient diaphragm mounted on the housing and a tubular return member mounted in a fuel return opening of the housing. The control member is preferably formed of resilient sheet metal and includes at least one annular convolution between the mounting portion and a stiff center portion configured as an inverted dome with a lower center part that acts as a valve member. The control member acts as a cover closing the internal fuel chamber and responds as a diaphragm to changes in pressure within the fuel chamber to flex upwardly by a rolling action of the convolution, which lifts the domed central portion, opening the valve and allowing excess fuel to drain through the return member.

Abstract: A fuel rail has a high pressure inlet and a low pressure outlet. The high pressure inlet feeds pressurized fuel to a plurality of injectors along the fuel rail. A fuel return line, which is connected with the low pressure outlet, is positioned substantially centrally of and coaxial with the fuel rail. The fuel return line is non-circular in configuration having a width to height ratio greater than one. The configuration of the return fuel line and the flexibility of the walls thereof provide a damper that reduces the pressure pulsations in the high pressure fuel.

Abstract: A pressure regulating valve including a valve seat on valve body, a valve element having a flow directing surface, and a spring biasing the valve element toward a closed position in which the flow directing surface bears against and defines a fluid seal at the valve seat. The valve element has a range of open positions in which the flow directing surface and the valve seat are progressively further separated and in which they cooperate in defining an annular flow orifice the area of which varies with the span between the valve seat and the flow directing surface. The flow directing surface redirects fluid flow upstream of the annular flow orifice through about 150.degree. to 180.degree. to induce on the valve element a force reaction which cooperates with a fluid pressure force reaction on the valve element to improve the sensitivity of the valve element to changes in fluid pressure upstream of the annular flow orifice.