Instruction Manual
W32- Series Medium-Vertical Compressors
Page I - 22.
4. VALVES
4.1. Initial operational check of valves
After roughly half an hour’s operation, Valves should
be checked. Note that intake line to valve heads
shold be hand warm and outlet-piping shold be hot.
Valves are then operating properly.
Should the intake pipe to the valve head of second
stage heat up excessively, and first stage safety
valve blow off, this would be an indication that
either intake or pressure valve of second stage is
malfunctioning. It is, therefore, necessary to remove
the valve head and to check and these valves, or to
replace them.
4.2. General instructions for changing the
valves
•
Always replace valves as a complete set.
•
Carefully clean dirty valves. Never use a sharp
tool for this purpose. Soak the valves in diesel oil
or petroleum and clean with soft brush.
•
Lubricate valves before installing with weicon AS
040, order no. N19753, or equivalent.
•
Check individual components for excessive wear.
If the valve seat and valve disks are dented,
replace the valves.
•
Valve head screws must be tightened with a
torque wrench.(see page I-21)
•
Check the valve space in the valve heads for dirt
and clean, if necessary.
•
Use only satisfactory gaskets and o-rings on
reasembly.
•
Observe the correct sequence when fitting
together again.
•
After finishing all maintenance work on the
valves, turn the compresor maually using the
flywheel and checkwhether all items have been
correctly installed.
•
30 minutes after restarting the copressor unit
stop unit, let is cool down to ambient temperature
and retigten valve studs and cap nuts. Otherwise
valves could work loose due to setings of the
gaskets.
•
Remove and check the valves every 1000
operating hours.
•
Replace the valves every 2000 operating hours
to avoid fatigue failure.
3.3. Changing the valves of the 1
st
stage
Removal of 1
st
stage pressure valve:
•
Remove cap nut
•
Loosen allen set screw
•
Remove the coupling
Assamble in reverse sequence
CAUTION
In order to avoid damaging the special tool or
the valve when using the tool, ensure that it is
pushed properly and firmly into the valve bore
so that it will not tilt when it is turned
Intake and pressure valve of the 1
st
stage is combined
in one plate valve under the valve head. Check that
marks “TOP” is really at the top when installed.
3.4. Changing valves of the 2
nd
stage
•
Unscrew intake and presure lines from the cylinder
head (7, Fig.9).
•
Remove internal hex. Screws fixing cylinder head
and completely remove the cylinder head from the
cylinder.
•
Insert two metal pins – 8-mm diameter, any
length – in the holes in the cylinder head and
secure these in a vice with the cylinder head on
top.
6
5
7
1
2
3
4
Fig. 9 Valves, 2
nd
stage
•
Unscrew intake valve body with the special tool.
(Fig.10)
CAUTION
In order to avoid damaging the special tool or
the valve vhen using the tool, ensure that it is
pushed properly and firmly into the valve bore
so that it is will not tilt when it is turned
