TWO EMPLOYEES WERE TRYING TO GET PUMP PRESSURE FROM GLUT TO FACE AREA. INJURED WAS TURNING #3 VALVE ABOUT 1/4 TURN WHEN PRESSURE CAUSED GLUT TO BREAK CHAIN THAT HELD GLUT TO MONORAIL. GLUT KNOCKED BOTH TO THE GROUND. EE SAID GLUT HIT INJURED IN THE HEAD. X-RAY SHOWED FRACTURE IN NECK. ALSO RECEIVED SUTURES.