Packing-adjusting means for capped valve

Claim 1

A VALVE OF THE CLASS DESCRIBED COMPRISING A BODY HAVING A SUBSTANTIALLY CYLINDRICAL UPPER PORTION, A BONNET OF A MAXIMUM EXTERNAL DIAMETER LESS THAN THAT OF THE UPPER PART OF THE VALVE BODY, THE VALVE BONNET HAVING AN AXIAL BORE, A VALVE STEM SLIDABLY RECEIVED IN SAID BORE AND EXTENDING OUTWARDLY BEYOND BOTH ENDS OF SAID BORE, A VALVE DISC ATTACHED TO THE LOWER END OF SAID VALVE STEM, A VALVE SEAT ON SAID BODY COOPERABLE WITH SAID DISC, SAID BORE BEING ENLARGED AT ITS UPPER END PORTION, PACKING RECEIVED IN THE ENLARGED PORTION OF THE BORE, A GLAND FOR APPLYING PRESSURE TO SAID PACKING DISPOSED ABOUT SAID VALVE STEM, SAID BONNET HAVING A CHAMBER AT ITS UPPER END INTO WHICH SAID ENLARGED PORTION OF THE BORE OPENS AND SAID VALVE STEM EXTENDS, THE UPPER END OF SAID GLAND BEING DISPOSED IN SAID CHAMBER, A YOKE RING RESTING ON SAID UPPER END OF THE GLAND, A PLUG THREADABLY ENGAGED WITH SAID BONNET WITHIN SAID CHAMBER AND HAVING A THREADED CENTRAL BORE IN WHICH SAID VALVE STEM IS THREADEDLY ENGAGED, SAID PLUG HAVING ADDITIONAL THREADED BORES AT DIAMETRICALLY OPPOSITE SIDES OF SAID CENTRAL BORE, PACKING ADJUSTING STUDS THREADEDLY ENGAGED IN SAID ADDITIONAL BORES, SAID STUDS BEING SPACED FROM SAID VALVE STEM A DISTANCE SUBSTANTIALLY LESS THAN THE VALVE STEM DIAMETER, THE LOWER END OF EACH STUD ENGAGING SAID YOKE RING TO EXERT A PRESSURE THEREON, A CYLINDRICAL CASING COAXIAL WITH SAID BONNET AND FIXED RELATIVE TO THE VALVE BODY, SAID CASING HAVING AN EXTERNAL DIAMETER SUBSTANTIALLY EQUAL TO THAT OF THE CYLINDRICAL UPPER PORTION OF SAID VALVE BODY, AND A REMOVABLE CAP NORMALLY CLOSING THE UPPER END OF SAID CYLINDRICAL CASING, SAID CAP AT LEAST IN PART DEFINING A CHAMBER WHEREIN THE UPPER ENDS OF SAID PACKING ADJUSTING STUDS ARE HOUSED.