how to stop portable air compressor ?

　　Downtime when stop first the manual valve to uninstall "uninstall" position will air compressor, after about 20 seconds, and then press the "stop" button, the motor stop; After downtime, such as expected for a long time need not, the isolating switch handle to the "stop" position, in case of error boot.
　　how to stop urgently portable air compressor ?
　　1.portable air compressor should be stopped urgently under the following circumstances.:
　　(1) the abnormal sound or vibration;
　　(2)safety valve is closed when  the exhaust pressure more than the safety valve setting pressure;
　　(3) portable air compressor  didn't automatically stop when exhaust temperature over 100 degrees Celsius ;
　　(4) the surrounding find emergencies circumstance.;
　　2. Emergency stop, do not need to uninstall first, can directly press the "stop" button .