Method of manufacture of valve construction

Claim 1

IN A METHOD FOR THE MANUFACTURE OF A VALVE OF THE BALL TYPE, THE STEPS OF FORMING A SINGLE METAL CASTING COMPRISING BOTH OUTER BODY AND INNER VALVE BALL PARTS, THE OUTER BODY PART BEING FORMED TO GENERALLY EMBRACE THE INNER VALVE BALL PART, THE CASTING HAVING AN OPENING EXTENDING THROUGH BOTH PARTS FROM ONE SIDE OF THE CASTING TO THE OTHER, THE INNER VALVE PART INCLUDING ANNULAR PORTIONS ON OPPOSITE SIDES OF THE SAME SERVING TO DEFINE PORTIONS OF SAID OPENING, SAID ANNULAR PORTIONS BEING INTEGRALLY JOINED WITH THE OUTER BODY PART, APPLYING MEANS TO HOLD THE INNER BALL PART RIGID WITH RESPECT TO THE BODY PART, AND THEREAFTER SEPARATING THE TWO PARTS BY MECHINING SAID ANNULAR PORTIONS WHILE THE INNER BALL PART IS BEING SO HELD.