Instruction Manual Breathing Air Compressors
40
This just ensures that the valve is functional and will release
pressure in case of a malfunction. To check the blow-off pres
sure value refer to ”Blow-off pressure check”.
Checking blow-off pressure
Check blow-off pressure of the final pressure safety valve reg
ularly, see maintenance schedule chapter 4.3. Pump unit to
final pressure with shut-off valve closed until safety valve
blows off. Check blow-off pressure of safety valve at pressure
gauge.
4.5.7. PRESSURE GAUGE
DESCRIPTION
The compressor unit is equipped with a final pressure gauge
(Abb. 51). The red marking on it shows the max. allowable
operating pressure.
Abb. 51 Final pressure gauge
final pressure 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.
4.5.8. VALVES
FUNCTIONAL 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 medium.
On the suction stroke, the intake valves open and the me
dium flows into the cylinders. At the start of the compression
stroke the intake valve closes and the medium opens the
pressure valve, Abb. 52.
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 mounting with Weicon AS 040,
part no. N19753, or equivalent.
- 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 section 7.
- Check the valve space in the valve heads for dirt and
clean, if necessary.
- 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.
- 30 minutes after restarting the compressor unit stop
unit, let it cool down to ambient temperature and re
tighten valve studs and cap nuts. Otherwise valves could
work loose due to setting of the gaskets.
Abb. 52 Valve operation
Intake Pressure
Intake and pressure valve of the 1st stage is a combined plate
valve under the valve head (Abb. 53).
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