Patent ID: 6273119
Filing Date: 2001-08-14
Classification: F02D,F16K,Y10T

Abstract:
A method of manufacturing a valve, said method comprising the steps of:(a) casting a first subhousing having between an inner face and an outer face thereof a first flow portion and a first stem portion, said first stem portion projecting outward from said first flow portion, said first flow portion defining a first cylindrical bore therethrough amid said inner and said outer faces and having a first seat arc that extends radially inward from and approximately 180.degree. along said first cylindrical bore below a horizontal plane that bisects said first subhousing;(b) casting a second subhousing having between an inner face and an outer face thereof a second flow portion and a second stem portion, said second stem portion projecting outward from said second flow portion, said second flow portion defining a second cylindrical bore therethrough amid said inner and said outer faces and having a second seat arc that extends radially inward from and approximately 180.degree. along said second cylindrical bore above a horizontal plane that bisects said second subhousing;(c) machining smooth said inner faces of each of said first and said second subhousings;(d) machining smooth a semicircular inner sidewall of said first seat arc so as to form a first valve seat recessed within said inner face of said first flow portion;(e) machining smooth a semicircular inner sidewall of said second seat arc so as to form a second valve seat recessed within said inner face of said second flow portion; and(f) mating said first and said second subhousings by said inner faces thereof so that said first and said second stem portions join to form a single stem housing and said first and said second flow portions join to form a single flow housing with said first and said second cylindrical bores aligned along a flow axis to form a flow passage through said flow housing and with said first and said second valve seats spaced equidistantly from a vertical plane defined at the site at which said inner faces of said first and said second subhousings are mated.