Southern Cross JCD-900 Series, Инструкция по эксплуатации

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LGCY Series Page 13
1.2.2 Control Air Circuit System:
Composition: proportional valve (pressure regulator), air release valve, air intake valve servo cylinder
and safety valve;
Operating principle:
After the start button is pressed (turning the LOAD/UNLOAD switching valve to
position 2 “- or UNLOAD” and driving the screw handpiece in the process of diesel engine start), the air
enters the handpiece through the air intake valve to quickly generate pressure. Then, the intake valve is
closed to make the internal air in the handpiece nearly become vacuum state and to start the light load
successfully; after successful start, the servo cylinder on the intake valve (opening pressure: 0.2Mpa) is
slowly opened in the process of pressure establishment due to increased system pressure. Another circuit
is opened by the internal integrated air release valve under the control of LOAD/UNLOAD switching
valve passage, to make the oil-air tank air and handpiece interconnected and reach internal circulating
state. The system is stabilized after its pressure gradually rises to about 0.45Mpa. After the temperature
of engine cooling liquid (water) temperature rises (idling time: 2-3 minutes), turn the LOAD/UNLOAD
switching valve to position 1 + or LOAD. Then, the equipment will enter the load (normal operation)
mode; when the pressure rises to the set operating pressure (i.e., rated pressure 1.0Mpa) of proportional
valve (i.e., pressure regulator), the proportional valve (i.e., pressure regulator) will operate to slowly
close the air intake valve based on the air consumption ; when the air consumption is sufficient or no air
is consumed (equivalent to closed state of ball valve), the proportional valve (i.e., pressure regulator)
will operate to fully close the air intake valve. The diesel engine speed changes with the pressure change
and is gradually reduced to the idle state.