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A low deviation pressure relief valve for a fuel pump consisting of a housing having an elongated bore having a continuous wall, an axis, shoulders arranged on the wall so as to extend toward the axis. A ball in the housing has a diameter at least less than the diameter of the bore and a ball retain

A low deviation pressure relief valve for a fuel pump consisting of a housing having an elongated bore having a continuous wall, an axis, shoulders arranged on the wall so as to extend toward the axis. A ball in the housing has a diameter at least less than the diameter of the bore and a ball retainer located in the bore upstream from the shoulders forms a ball seat by pre-coining process. The ball is smaller than the retainer seat in diameter to ensure an edge seal with the ball. A spring coaxial with the axis located down stream from the ball retainer and supported on the shoulders, and the ball is located between the spring and the ball seat wherein low flow restriction is created and reduced pressure variation is created as fluid flows past the ball and less buckling in the spring is created by guide ribs.

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1. A low deviation pressure relief valve for a fuel pump, said relief valve comprising:a housing having an elongated bore having a continuous wall, an axis, shoulders arranged on said wall so as to extend toward said axis, a ball in said housing having a diameter less than a the diameter of said bor

1. A low deviation pressure relief valve for a fuel pump, said relief valve comprising:a housing having an elongated bore having a continuous wall, an axis, shoulders arranged on said wall so as to extend toward said axis, a ball in said housing having a diameter less than a the diameter of said bore, a ball retainer located in said bore upstream from said shoulders, said ball retainer having a pre-coined section and a coined section forming a ball seat, wherein said ball seat forms an edge seal condition with said ball, and wherein an inverted S-shaped reverse bent portion of said ball retainers forms said ball seat, a spring coaxial with said axis located downstream from said ball retainer and supported on said shoulders, said ball located between said spring and said ball seat, and guide ribs in said bore at a location coaxial with said spring and spaced around said axis. 2. The pressure relief valve according to claim 1 wherein said bore is a star shape to provide for flow of fluid around the spring to thereby reduce flow restriction.3. The pressure relief valve of claim 2 wherein said bore allows fuel flow to by-pass the spring to reduce flow restriction.4. The pressure relief valve of claim 1 in which said ribs prevent the ball from substantially deviating from the axis of the housing to thereby ensure more consistent sealing times and prevent the ball from being stuck off the seat.5. The pressure relief valve of claim 1 wherein said ball diameter is smaller than a diameter of the pre-coined section.6. The pressure relief valve of claim 1 wherein the flow resistance coefficient R is in the range of 0.5-5.0, the spring stiffness coefficient S is in the range from 0.5 to 3.50.7. The pressure relief valve of claim 6 wherein said R is 2.8 and S is 2.85.8. A low deviation pressure relief valve for a fuel pump, said relief valve comprising:a housing having an elongated bore having a continuous wall, an axis, shoulders arranged on said wall so as to extend toward said axis, a ball in said housing having a diameter less than a diameter of said bore, a ball retainer located in said bore upstream from said shoulders, the ball retainer having a straight section and a reverse bent portion forming a ball seat, a spring coaxial with said axis located downstream from said ball retainer and supported on said shoulders, said ball located between said spring and said ball seat, guide ribs in said bore at a location coaxial with said spring and spaced around said axis, and wherein the flow resistance coefficient R is in the range of 0.5 to 5.0 and the spring stiffness coefficient S is in the range from 0.5 to 3.50. 9. The pressure relief valve according to claim 8 wherein said bore is a star shape to provide for flow of fluid around the spring to thereby reduce flow restriction.10. The pressure relief valve of claim 8 in which said ribs prevent the ball from deviating from the axis of the housing to thereby ensure more consistent sealing times and prevent the ball from being stuck off the seat.11. The pressure relief valve of claim 8 wherein said ball diameter is smaller than a diameter of the straight section.12. The pressure relief valve of claim 8 wherein said reverse bent portion is formed by formed by coining.13. The pressure relief valve of claim 8 wherein said R is 2.8 and S is 2.85.14. A low deviation pressure relief valve for a fuel pump, said relief valve comprising:a housing having an elongated bore having a continuous wall, an axis, shoulders arranged on said wall so as to extend toward said axis, a ball in said housing having a diameter less than a diameter of said bore, a ball retainer located in said bore upstream from said shoulders, said ball retainer having a pre-coined section and a coined section forming a ball seat, a spring coaxial with said axis located downstream from said ball retainer and supported on said shoulders, said ball located between said spring and said ball seat, guide ribs in said bore at a location coaxial with said spring and spaced around said axis, and wherein the flow resistance coefficient R is in the range of 0.5-5.0, and the spring stiffness coefficient S is in the range from 0.5 to 3.50. 15. The pressure relief valve of claim 14 wherein said R is 2.8 and S is 2.85.16. The pressure relief valve of claim 14 wherein said ball diameter is smaller than a diameter of the pre-coined section.