Bauer Junior II-W - Valves Changing; Valves Operational Check

Instruction Manual  Junior II
25
Fi
g
. 33 Final
p
ressure
g
au
g
e
Mark
MAINTENANCE
We recommend that the final pressure gauge is checked
from time to time. For this purpose we have developed a
special test pressure gauge with an adaptor which immedi
ately recognizes any deviations in readings (see High Pressure
Accessories Catalogue 8550/..).
Slight deviations during operation are normal and can be ig
nored. Excessive inaccuracy will require the pressure gauge
to be replaced.
4.4.8. VALVES
DESCRIPTION
The valve heads of the individual stages form the top part of
the cylinders. The intake and pressure valves are fitted inside
the valve heads. Note that the valves are operated by the
flow of the air.
On the suction stroke, the intake valves open and the air
flows into the cylinders. At the start of the compression
stroke the intake valve closes and the air opens the pressure
valve, Fig. 34.
Intake and pressure valve of the 1st stage is a plate valve
(Fig. 35).
INITIAL OPERATIONAL CHECK
After maintenance work on the valves, valves should be
checked. Note that the intake line to the valve heads should
be warm and outlet piping should be hot. Valves are then op
erating properly.
Fig. 34 Valve operation
Intake Pressure
Fi
g
.
35
V
a
lv
e
1
st
stage
Intake sidePressure side
Top view
from intake fil
ter
to 2nd stage
N4860−F98
GENERAL INSTRUCTIONS FOR CHANGING THE VALVES
- Always replace valves as a complete set.
- Observe the correct sequence when fitting together
again.
- 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 tightening torque values chapter 7.).
- Check the valve space in the valve heads for dirt and
clean, if necessary.
- 30 minutes after restarting the compressor stop unit,
let it cool down to ambient temperature and retighten
valve studs and cap nuts. Otherwise valves could work
loose due to setting of the gaskets.
- Use only satisfactory gaskets and O-rings on reassembly.
- After finishing all maintenance work on the valves, turn
the compressor manually using the flywheel and check
whether all items have been correctly installed.