| 摘要 |
<p>PURPOSE:To sufficiently lower the humidity of compressed air supplied to an air reservoir even at the time of re-operation after inspection, by providing a change-over apparatus enabling the manual change-over of a pneumatic circuit so as to supply the air for said circuit to the downstream side of a throttle passage and capable of opening a drain valve apparatus. CONSTITUTION:A compressor 2 is stopped at the time of inspection and a change-over valve 15 is turned to supply a part of compressed air in a main tank 12 to the control port 20a of a drain valve 20 from a piping 19. The change-over valve 15 is further turned to confine the compressed air supplied to the control port 20a and the compressed air in the main tank 12 is supplied to a purge tank 8 through pipings 17, 18 and a double check valve 9. The compressed air from the purge tank 8 and the main tank 12 is discharged from a drain port 20b in the same way as a usual purge cycle. After the air in the tank 12 is entirely discharged, the change-over valve 15 is changed over and a part of the compressed air confined in the side of the control port 20a is made to reversely flow to the tank 12 and the remainder is exhausted to the open air from piping 16 and the exhaust port 14c of a governer 14.</p> |
