Safety Valves - L&W LW 300 E Operating Instructions Manual

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 pressu-
re 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: 50 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 che-
cked 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
i
Replace defective safety valves immediately!
LW 300 E / LW 450 E
Version: 261012-001 E
Safety valve 1st stage
Safety valve 2nd stage
Safety valve 3rd stage
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