PQ-400 Double Spring Nozzle Tester 

A: Internal pressure meter

B: Air supply meter

C: Air supply throttle

 If the throttle whirls is clockwise, quantity of air input will be less, and oil input is less as well. Inverse, the input oil will increase.

D: Governor Valve

 If the governor valve circumgyrate to the bottom, rate of oil pressure and air pressure is 100: 1 . for esample , when air pressure 7 kg, the oil pressure will be 700 kg.

E:Air switch valve

 The air valve is opened by pulling, and closed by pushing.