Lenhardt & Wagner LW 150 ES, Operating Instructions Manual

Page: 63 / 187

LW 150 ES / LW 200 ES
Version: 31.01.22-001 E Page A - 61
A
M A I N T E N A N C E A N D S E R V I C E
Pressure maintaining / non return valve
A pressure maintaining / non return valve is installed after the
filter housing. It maintains a pressure of at least 150 bar inside
the filter housing - this optimises filter efficiency.
Pressure maintaining valve
The pressure maintaining valve drains a large part of the wa-
ter content of the compressed air mechanically by ensuring
the minimum outlet pressure. This guarantees optimal drying
and purification of the breathing air.
After starting the compressor, the pressure inside the final
filter housing constantly increases. The pressure maintaining
the valve prevents the compressed air from blowing off (final
pressure gauge = 0 bar).
When the adjusted opening pressure is reached (150 and 180
bar), the purified compressed air flows via pressure maintai-
ning and non return valve to the filling valve.
The value of the opening pressure of the pressure maintaining
valve can be read at the final pressure gauge. When opening
pressure is reached, the pressure gauge value increases within
a few seconds.
Note
If the adjusted opening pressure of the pressure maintaining valve is higher than the final
pressure of the compressor, the final pressure safety valve blows off before pressure
maintaining valve opens (final pressure = 0 bar). When valve settings are not clear (e.g.
after disassembly / repair), start the adjustment with a low basic setting (turn adjusting
screw approx. 3 times in).
i
Pressure maintaining/non-return valve