Pressure Relief Valve - Gardner Denver L Series Service Manual

Fig. 20
1 Air intake filter
2 Intake filter monitor (visual)
As a standard, the air filter is provided with a visual in-
take filter monitor (-2- Fig. 20), which indicates clogging
of the air filter cartridge.
When the red service field of the intake filter monitor is
visible and remains clicked into position while the screw
compressor is out of operation, replace the air filter
cartridge.
However, the air filter cartridge should be replaced at
the latest as specified in chapter 7.3. Check air filter at
least once a week or, if required, daily for the
accumulator of dust. When carrying out maintenance
work, make sure that no dirt gets to the clean air side of
the air filter.
Changing intervals for air filter cartridge
The operating conditions (e.g., coolant temperatures),
the operating modes and the quality of the intake air
(e.g., content of dust, content of gaseous foreign
substances such as SO
2
a strong influence on the service life of the filters (air
filters, water filters, fine separators).
Where such conditions exist the filter element may
require changing more frequently.
Change the air filter as follows:

Pull snap latch outward and remove housing base.

Detach air filter cartridge while slightly turning it.

Carefully insert new air filter cartridge in the housing.

Close air filter with housing base. The snap latches
must click into position.
and solvent vapors, etc.) have
13-25-638 v03

10.8 Pressure relief valve

DANGER
When checking pressure relief valve there
is an explosive release of pressure.
Failure to perform this operation in a safe
manner or without safety equipment may
result in personal injury or death.
 Use the appropriate safety equipment,
hearing and eye protection, and use
safety precautions when performing this
PRV check on an operating machine.
2
1
Fig. 21
1 Pressure relief valve
2 Pull Ring
The pressure relief valve has no user serviceable or
repairable components.
Testing the pressure relief valve
The valve can be tested:
1 On a separate compressed-air system. or
2 When raising the system operating pressure to its
normal level.
Keep local legislation in mind when testing.
Pressure relief valve operation (-1- Fig. 21) depends on
the valve type and can be carried out by:

Operating the lifting lever/pull ring.
If the pressure relief valve doesn't close itself or is leaky,
close the doors of the compressor and push the STOP
Button. After the pressure in the pressure reservoir is
reduced to ambient pressure, renew the pressure relief
valve.
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