Lenhardt & Wagner LW 150 ES, Operating Instructions Manual

Page: 62 / 187

LW 150 ES / LW 200 ES
Version: 31.01.22-001 E Page A - 60
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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.
Note
Replace defective safety valves immediately!
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Safety valve 1st stage Safety valve 3rd stage Safety valve 2nd stage