Valve and method of making it

Claim 1

A VALVE COMPRISING, (A) A HOUSING, (B) A FLOW PASSAGE EXTENDING THROUGH THE HOUSING, (C) A VALVE CHAMBER INTERSECTING SAID FLOW PASSAGE, (D) A VALVE BALL HAVING A DIAMETER LARGER THAN THE DIAMETER OF THE FLOW PASSAGE OF CORROSION RESISTING MATERIAL ROTATABLY MOUNTED IN THE CHAMBER AND HAVING A DIAMETERICALLY EXTENDING FLOW PASSAGE WHEREBY THE VALVE IS OPENED AND CLOSED BY ROTATION OF THE BALL VALVE IN THE CHAMBER, (E) A VALVE STEM SECURED TO SAID VALVE BALL AND EXTENDING THROUGH THE HOUSING FOR TURNING SAID BALL VALVE, (E) A SINGLE CONTINUOUS SLEEVE FOR CORROSION RESISTING MATERIAL WITHIN AND EXTENDING THE FULL LENGTH OF SAID FLOW PASSAGE AND THROUGH SAID CHAMBER AND HAVING A CENTRAL PORTION IN CONTACT WITH SUBSTANTIALLY ALL OF THE OUTER SURFACE OF SAID VALVE BALL EXCEPT FOR THE VALVE STEM, AND (G) RINGS OF RESILIENT MATERIAL (1) POSITIONED IN THE WALLS OF SAID CHAMBER BENEATH SAID SLEEVE AND ON OPPOSITE SIDES OF SAID VALVE BALL AND SURROUNDING THE FLOW PASSAGE IN SAID MEMBER WHEN IT IS OPEN POSITION AND (2) RESILIENT PRESSING SAID SLEEVE AGAINST THE VALVE BALL.