Hitachi NEXT Series Service Manual page 24

Oil-free screw compressor
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◆ Disassembly of strainer element during operation
Aftercooler side
Ball valve (2)
Ball valve
(1)
◆ Valve conditions during normal operation
Aftercooler side
Ball valve (2)
Ball valve
(1)
Three-way change valve
Intercooler side
Three-way change valve
Intercooler side
22
■   C leaning the strainer element during
operation
  I f the strainer needs to be cleaned while the air
compressor is running, contact the local HITACHI
distributor/master dealer or representative office.
While the air compressor is running, strainer is
always pressurized. Be careful extremely to the
high pressure when the strainer is removed.
(1) Intercooler side
① Turn three-way change valve on the intercooler
side from Ⓐ to Ⓑ.
② Element is still pressurized depending on the
solenoid valve action, so be careful extremely
when opening the strainer plug. Remove the
strainer element.
③ Wash the element with water and blow air, and
reassemble it.
④ Turn three-way change valve from Ⓑ to Ⓐ.
(2) Aftercooler side
① Turn ball valve (1) on the aftercooler side from
Ⓒ to Ⓓ.
② Check that ball valve (2) is completely closed (Ⓔ
side). In this state, strainer pressure in the
solenoid valve is released by solenoid valve
action.
③ After verifying the compressed air is discharged,
remove the strainer element. If solenoid valve
(1) or (2) is opened even slightly, strainer is still
pressurized.
④ If solenoid valve (2) is opened to the Ⓕ side in
this state, condensate can be drained while
cleaning the strainer element.
⑤ Wash the element with water and blow air, and
reassemble it.
⑥ Turn the ball valve (1) on the aftercooler side
from Ⓓ to Ⓒ. Also check that ball valve (2) is
completely closed (Ⓔ side).

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