Pressure Reducing Valve Replacement Procedure - Hitachi IJ PH Service Manual

4.3 Pressure Reducing Valve Replacement Procedure

1 Perform "Pressure relief".
2 Perform "4.1.2 Approach to the parts on the front side of the equipment".
3 Remove Nonsert M4x16 (2 positions: upper right and lower left of
Pressure reducing valve) and Pressure reducing valve.
And remove Nonsert M4x12 (2 positions) and Pressure reducing valve
joint PRV, and remove the O-rings (3 pieces).
"Caution" : Put wiping paper under Pressure reducing valve to provide
Pressure reducing valve
4 Replace Pressure reducing valve and the O-rings (3 pieces) with new
ones.
"Caution" : Make sure to use O-rings 4.7 (3 pieces).
O-ring 4.7
5 Clean the O-ring mounting positions of Pressure reducing valve joint PRV
with makeup ink.
And set the O-rings (3 pieces) in the mounting positions of Pressure
reducing valve joint PRV.
[Pressure reducing valve side]
Pressure reducing valve joint PRV
for an ink drip.
Pressure reducing valve joint PRV
Nonsert M4X12
Nonsert M4X16
O-ring S-4EPT
4-6
Pressure reducing valve
[Ink circulation unit side]
O-ring 4.7
O-ring 4.7