1 SZ-type vacuum pump to maintain the safety precautions
 1) is strictly prohibited in the operation or securing loose parts with pressure bolts and other accessories.
 2) The pump is running, not rub or maintenance of its moving parts.
 3) pump operating process, the operator should always check the operating conditions, such as unusual, should be immediately stopped until the pressure dropped to zero before the overhaul.

 2 SZ-type vacuum pump overhaul of the safety precautions
 1) maintenance, turn off the import and export of valves, plus blind and system isolation block. Cut off the power, put up