LOW LEAKAGE SEAT VALVE GUIDE

摘要

An apparatus for setting a clearance has a movable body and a valve guide. A valve body is disposed along the axis of the movable body, and a bore hole is formed in the movable body. The bore hole is formed on the axis and includes a first bore with a first diameter, a receiving surface, and a second bore. A tool having a forward surface is inserted into the bore hole and pressed against the receiving surface. The flow of a fluid between the guide cylinder and the movable body is determined and compared against a standard. If it does not meet the criteria, the force is adjusted and reapplied until it meets the desired value.

主权项

1. A method for setting a clearance between a guide and a movable body slideably received into the guide, comprising the steps of:
(a) forming a bore hole in the movable body along a longitudinal axis of the movable body, the bore hole including a first bore having a first diameter; (b) forming a receiving surface in the bore hole by forming a coaxial second bore to extend from a bottom of the first bore, the second bore having a second diameter smaller than the first diameter; (c) inserting a tool into the bore hole; (d) contacting a forward surface of the tool with the receiving surface of the bore hole; (e) applying an axial driving force to the tool; (f) translating a portion of the axial driving force radially outwardly with the receiving surface; (g) responsive to the step of translating, outwardly displacing a wall adjacent to the bore hole; (h) relieving the driving force on the tool; (i) pressurizing a first volume to a first pressure with a fluid, the first volume in fluid communication with a second volume at a second pressure through the clearance disposed between an outside surface of the movable body and an inside surface of a guide; (j) determining a value of either a pressure difference between the first and second volumes or a flow rate of the fluid between the first and second volumes; (k) comparing the value against a predetermined standard; and (l) if the value does not meet the desired standard, adjusting the driving force applied in step (e) and repeating steps (e)-(l).