Patent ID: 6533242
Filing Date: 2003-03-18
Classification: F16K

Abstract:
A system for facilitating proper seating and self-centering of a head of a valve shaft in a valve seat, said head being disposed on a first end of said valve shaft, a second end of said valve shaft being received within a first axial bore in a primary bushing, said valve shaft being axially reciprocable between an open and a closed position, said system comprising:a second bushing having a second axial bore, said second axial bore having a second bore diameter, said second axial bore being disposed substantially concentric relative to said first axial bore; and said valve shaft having a first portion and a second portion, said first portion having a first portion diameter, said second portion having a second portion diameter, said first portion diameter being a predetermined amount less than said second bore diameter, said second portion diameter being substantially equal to said second bore diameter, at least part of said first portion being received within said second axial bore when said valve shaft is in said closed position, at least part of said second portion being received within said second axial bore when said valve shaft is in said open position.