Needle valve for extreme pressure

Claim 1

A HIGH PRESSURE NEEDLE VALVE ADAPTED TO RETAIN HIGH PRESSURE FLUID ON BOTH SIDES OF THE CLOSED VALVE, COMPRISING, IN COMBINATION: WALLS DEFINING AN ENCLOSED CHAMBER, A FIRST BORE LEADING OUT OF SAID CHAMBER, AND A SECOND BORE COAXIAL WITH SAID FIRST BORE WITHIN A PREDETERMINED MANUFACTURING TOLERANCE; A NEEDLE IN SAID FIRST BORE; SAID NEEDLE HAVING SCREW THREADED ENGAGEMENT WITH SAID FIRST MEMBER AND A HEAD ADAPTED TO ENGAGE A SEAT IN SAID SECOND BORE; SAID HEAD AND SEAT INCLUDING CONTACT FACES SHAPED TO CENTER SAID HEAD ON THE AXIS OF SAID SECOND BORE; SAID SCREW THREADED ENGAGEMENT OCCUPYING A FRACTION OF THE LENGTH OF SAID NEEDLE, REMOTE FROM SAID SEAT; SAID NEEDLE HAVING A TERMINAL PORTION BEYOND SAID THREADED ENGAGEMENT ADAPTED TO RECEIVE TORQUE FOR TURNING SAID NEEDLE; SAID SCREW THREADED ENGAGEMENT HAVING PREDETERMINED LOOSENESS SUFFICIENT TO PERMIT THE HEAD OF SAID NEEDLE TO WOBBLE; THE AMOUNT OF WOBBLE BEING NOT LESS THAN SAID PREDETERMINED MANUFACTURING TOLERANCE; AND A PRESSURE-TIGHT PACKING INTERPOSED BETWEEN SAID NEEDLE AND SAID FIRST BORE ADJACENT THE INNER END OF SAID BORE; SAID PACKING INCLUDING ANNULAR MEMBERS HAVING RADIAL CLEARANCE IN SAID BORE, TO PERMIT SAID PACKING TO SHIFT AND ALLOW THE HEAD OF SAID NEEDLE TO WOBBLE.