Patent ID: 7587824
Filing Date: 2009-09-15
Classification: F16K,Y10T

Abstract:
1. A method for rebuilding a flow control valve, comprising the steps of: providing a flow control valve having a rotor positioned in a chamber of a valve body, and the rotor having a valve stem, which has an outside diameter, and a top cover plate mounted to the valve body having a first bore through which the valve stem protrudes, and the first bore having a diameter; removing the top cover plate and rotor from the valve body; reducing the outside diameter of at least a portion of the valve stem to a predetermined outside diameter; positioning a bushing on the valve stem over the portion of the valve stem of which the diameter has been reduced; forming a second bore in the top cover plate that is coaxially aligned with respect to the first bore and the second bore having a diameter that is larger than the diameter of the first bore thereby forming a lip between the first bore and second bore; positioning a seal on the lip in the top cover plate; inserting the rotor into the valve chamber of the valve body; and positioning the top cover plate over the rotor so the valve stem protrudes through the first bore and second bore in the top cover plate, and the seal is disposed between the top cover plate and the bushing on the valve stem.