TM 10-3930-659-20 12-27.    PRIORITY VALVE RELIEF PRESSURE TEST (Con't). 7. Remove hose (12), adapter (11), and two preformed packings (10) from priority valve (1).  Discard preformed packings. 8. Turn adjusting screw (13) clockwise to Increase pressure or counterclockwise to decrease pressure until pressure reading is within specification. 9. Install adapter (11), two new preformed packings (10), and hose (12) on priority valve (1). 10. Repeat steps 4 through 9 until pressure reading is within specification.  If pressure cannot be adjusted to TA707606 12-69