Bauer mariner 320 Instruction Manual - Instruction Manual
Instruction Manual
Breathing Air Compressors
42
stage every 15 minutes during operation. In addition, the au
tomatic condensate drain is designed to drain these filters
after shut-down of the compressor unit and to unload the
compressor during the starting phase.
The automatic condensate drain system (Abb. 56) operates
electro-pneumatically and comprises the following main
items:
• One solenoid valve, normally open type, functioning as
condensate drain valve after the 2nd stage
• Two pneumatically operated condensate drain valves,
normally open type for the intermediate separator after
3rd stage and the oil and water separator or the central
filter after the last stage.
• A condensate manifold
• A condensate separator/silencer
• A condensate tank
• An electrical timer
3
4
1
5
2
Abb. 56 Automatic condensate drain unit
1
Condensate drain valve, intermediate separator 3rd stage
2
Condensate drain valve, filter system
3
Manual drain tap
4
Solenoid valve, condensate drain 2nd stage
5
Condensate separator/silencer
Operation
The normally open condensate drain valves are connected in
cascade mode. The condensate from the intermediate separ
ator after the 2nd stage is applied to the solenoid valve. The
solenoid valve is normally open. The condensate from the in
termediate separator after the 3rd stage and from the oil and
water separator is led to the respective pneumatically oper
ated condensate drain valve.
Control air
Condensate
Abb. 57 Normal operation
1
Intermediate separator after 2nd stage
2
Intermediate separator after 3rd stage
3
Oil and water separator after 4th stage
4
Solenoid valve condensate drain 2nd stage
5
Condensate drain valve 3rd stage
6
Condensate drain valve 4th stage
7
Servo piston
8
Valve seat
9
Condensate outlet
The required control air for the 3rd/4th stage intermediate
separator drain valve is taken from the intermediate separ
ator after the 2nd stage. The control air for the oil and water
separator drain valve is taken from the intermediate separ
ator after the 3rd stage. At compressor start-up, the solenoid
valve (4) is open and so are condensate drain valves (5) and
(6) because there is no control air available at this moment.
At start-up of the compressor, the solenoid valve is energized
and closes: due to build-up of pressure by compressor oper
ation, control air flows into condensate drain valves (5) and
(6). The servo-pistons (7) are pressed onto valve seats (8) and
the condensate drain valves close.
Condensate drain
Every 15 minutes, 3/2-way solenoid valve (4) is deenergized
for approx. 10 seconds by the timer.
Solenoid valve (4) opens and drains the condensate from the
2nd stage intermediate separator (1). Due to the pressure
loss in intermediate separator (1) the control pressure for
condensate drain valve (5) for intermediate separator (2) is
also removed. The servo-piston (7) of the condensate drain
valve for the intermediate separator is unloaded, and the
control pressure vented through the relief port.
The piston (7) of the drain valve is raised by pressure from the
intermediate separator (2), the valve opens, and condensate
is drained. Because of the resulting pressure loss within the
intermediate separator (2), the control pressure for the con
densate drain valve (6) for the oil and water separator (3) is