EE and co-worker were opening valve. Valve was stiff. EE reported pain in left shoulder after. EE was taken to the ER was released back to work. EE was on last schedule work day. EE reported to work on 6/28/17 reported that ee still had pain in shoulder. EE went to PCP on 6/30/17. EE report on 7/3/17 to us that ee had been taken off work and referred to another physician.