Lenhardt & Wagner LW 320 E MC, Operating Instructions Manual

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LW 320 E MC / LW 400 E MC
Version: 16.03.2015
M A I N T E N A N C E A N D S E R V I C E
Safety valves
Every pressure stage is equipped with a separate over
pressure safety valve. Safety Valves avoid a non permissible
high pressure at the specific pressure stages and limit
maximum operation pressure of the compressor.
Safety valves are adjusted to:
• 1st Stage: 8 bar
• 2nd Stage: 70 bar
• 3rd Stage: max. final pressure
The adjusted blow-off pressure [bar] of the safety valves is
indicated on their housings.
All safety valves are factory sealed with special L&W safety
seals to avoid manipulation of the limit value settings.
Safety valves with removed seals have to be immediately
checked for the prescribed settings and replaced if necessary.
The safety valve of the final stage is furthermore equipped
with a knurled screw to be activated once.
Turning the knurled screw clockwise could vent the valve
completely and therefore the final filter housing.
During normal operation conditions, the knurled screw has to
be turned anti-clockwise up to the upper stop. An integrated
circlip avoids complete unscrewing.
If a safety valve blows off, it indicates problems with either
inlet or outlet valve of the following stage.
Fig. - Safety valve 1st stage
Fig. - Safety valve 2nd stage
Fig. - Safety valve 3rd stage
Note
Replace defective safety valves immediately!
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