Fluid valve assembly
AssigneeHitachi, Ltd.
InventorPrashanth Avireddi
Life of this patent
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Abstract
A fluid valve assembly having a housing with a valve seat which forms a fluid port. A valve is movable along an axis relative to the port between an open and a closed position. This valve includes a protrusion complementary in shape to, but slightly smaller than, the port. The protrusion is at least partially positioned in the port when the valve is in its closed position at which time a clearance space between the port and the protrusion is sufficiently small to prevent fluid flow through the port. A main spring disposed between the housing and the valve resiliently urges the valve towards its closed position. A second spring is also operatively positioned between the valve and the housing which urges the valve away from the valve seat towards its open position and prevents contact between the valve and the valve seat.
Claims20
A fluid valve assembly comprising:
- a housing forming a hollow cylindrical port of a first diameter having a circular valve seat at an opening thereof,
- a valve movable along an axis relative to said hollow cylindrical port between an open and a closed position, said valve being circular facing the circular valve seat, said valve having a first portion of a second diameter and a cylindrical protrusion extending from the first portion of a third diameter that is less than said second diameter,
- wherein said cylindrical protrusion is complementary in shape to said hollow cylindrical port and said third diameter of said cylindrical protrusion is slightly less than said first diameter of said hollow cylindrical port,
- wherein said cylindrical protrusion extends at least partially within said hollow cylindrical port when said valve is in said closed position,
- wherein said second diameter of said first portion of said valve is greater than said first diameter of said hollow cylindrical port,
- wherein with said valve in said closed position, a first clearance between said hollow cylindrical port and said cylindrical protrusion and a second clearance between said valve and said circular valve seat are sufficiently small to prevent fluid flow through said hollow cylindrical port,
- a main spring disposed between said housing and said valve which resiliently urges said valve toward said closed position, and
- a second spring operatively positioned coaxially around said main spring between said valve and said housing which urges said valve away from said circular valve seat, said second spring being dimensioned so that contact between said valve and said circular valve seat is prevented when said valve is in the closed position.
A fuel delivery system comprising:
- a fuel pump having a valve assembly;
- a fuel rail;
- and
- one or more fuel injector(s), wherein the valve assembly comprises:
- a housing forming a hollow cylindrical port of a first diameter having a circular valve seat at an opening thereof,
- a valve movable along an axis relative to said hollow cylindrical port between an open and a closed position, said valve being circular facing the circular valve seat, said valve having a first portion of a second diameter and a cylindrical protrusion extending from the first portion of a third diameter that is less than said second diameter,
- wherein said cylindrical protrusion is complementary in shape to said hollow cylindrical port and said third diameter of said cylindrical protrusion is slightly less than said first diameter of said hollow cylindrical port,
- wherein said cylindrical protrusion extends at least partially within said hollow cylindrical port when said valve is in said closed position,
- wherein said second diameter of said first portion of said valve is greater than said first diameter of said hollow cylindrical port,
- wherein with said valve in said closed position, a first clearance between said hollow cylindrical port and said cylindrical protrusion and a second clearance between said valve and said circular valve seat are sufficiently small to prevent fluid flow through said hollow cylindrical port,
- a main spring disposed between said housing and said valve which resiliently urges said valve toward said closed position, and
- a second spring operatively positioned coaxially around said valve between said valve and said housing, which urges said valve away from said circular valve seat, said second spring being dimensioned so that contact between said valve and said circular valve seat is prevented when said valve is in the closed position.
Dependencies are inferred from the claim text.