Patent ID: 6264168
Filing Date: 2001-07-24
Classification: F16K,Y10T

Abstract:
A method of forming a multi-piece housing for a forged flange-type ball valve comprising the steps of:a) forging a ball valve housing with an outwardly extending first connection flange, a connection hole having a first diameter and a first passage communicating with the connection hole and having a second diameter greater than the first diameter, the first passage and connection hole passing completely though the ball valve housing;b) forging a pipeline connection section having an outwardly extending second connection flange on a first end portion, a second passage extending completely through the pipeline connection section, and a reduced diameter end portion on a second end portion opposite to the first end portion;c) forming external threads on the reduced diameter end portion of the pipeline connection section;d) forming internal threads on a portion of the ball valve housing bounding the connection hole;e) forming a ball valve seat in a portion of the ball valve housing bounding the first passage;f) forming a handle mounting hole in the ball valve housing in communication with the ball valve seat;g) forming a plurality of holes in at least the second connection flange;h) forming a gasket containment recess in an outer surface of the reduced diameter end portion of the pipeline connection section;i) inserting a water-tight gasket into the gasket containment recess; and,j) threading the external threads on the reduced diameter portion of the pipeline connection section into the internal threads of the ball valve housing to affix the ball valve housing and the pipeline connection section together such that the first passage, the connection hole and the second passage are aligned, to form the multi-piece, forged ball valve housing.