a internal pressure meter b air supply meter c air supply throttle:if the throller whirls in clockwise,quantity of input air is less,oil of input is less. inverse, the oil of input will increase. d governor valve:if governor valve circumgyrate to the bottom,rate of oil pressure and air pressure is 50:1,for example , if air pressure is 7 kg,oil pressure is 350 kg. e air switch valve:if the air switch valve is pulled ,then the air valve opens, if the air switch valve is pushed,the air valve closes