Patent ID: 6964251

Claim:
An assembly, comprising: a) a socket body including a forgeable material and provided with: i) an outer socket surface, a first socket surface, a second socket surface, and a socket passage; ii) the outer socket surface is configured to cooperate with a second inner lifter surface of a valve lifter body; iii) the first socket surface includes a push rod cooperating surface and defines a first socket hole that links the first socket surface with the socket passage; iv) the second socket surface defines a second socket hole that links the second socket surface with the socket passage and is provided with a protruding surface, a first flat surface, and a second flat surface, wherein the protruding surface is located between the first flat surface and the second flat surface; b) the leakdown plunger includes: i) a first plunger opening, a second plunger opening, and an outer plunger surface enclosing an inner plunger surface; ii) the first plunger opening is provided with an annular plunger surface defining a plunger hole shaped to accommodate an insert; iii) the second plunger opening is configured to cooperate with the socket body; iv) the outer plunger surface includes a cylindrical plunger surface and an undercut plunger surface that forms a leakdown path with the valve lifter body; v) the undercut plunger surface is cylindrically shaped and located closer to the second plunger opening than the first plunger opening; c) the valve lifter body includes: i) an outer lifter surface that encloses a first lifter cavity and a second lifter cavity; ii) the first lifter cavity includes a first inner lifter surface and a first lifter opening shaped to accept a roller; and iii) the second lifter cavity includes the second inner lifter surface and a second lifter opening, wherein the second inner lifter surface is provided with a plurality of cylindrical surfaces and configured to accommodate the socket body and the leakdown plunger.