A optional manual on/off switch is also available and, when installed,
allows the pulse system to be activated at any time, whether or not the fan
is running. This allows periodic deep cleaning of the filter cartridges and
will extend filter life. This option should be monitored when used to
prevent accumulated dust being forced backward down the dirty air inlet
and out into the workspace.
3.
Air Pressure Accumulator Tank. An air pressure accumulator tank is pro
this tank. The entire capacity is released in one (1) pulse each time one of
the diaphragm valves is opened. Some Scrubber models will have more
than one accumulator tank.
4.
Solenoid Valves. There are three (3) or five (5) solenoid
releases a small amount of pressure, allowing a control diaphragm to
depressurize and open a 1 in. diameter valve. Each pilot
solenoid is
energized in turn by the timer control board.
5.
Diaphragm Valves. There are three (3) or five (5) pilot-operated dia-
phragm valves in each AirWall Scrubber. When the pilot solenoid releases
the diaphragm pressure holding the valve closed, the valve snaps open,
immediately releasing the contents of the air accumulator tank through the
opening in the valve and into a pulsejet blow pipe.
6.
Pulsejet Blow Pipe. Each pulsejet blowpipe, located in the upper AirWall
frame, contains two (2) or three (3) orifices, depending on scrubber type.
These orifices are positioned above, and directed into, the opening of the
filter cartridge through the tube sheet. As the pulse of air reaches the filter
cartridge opening it travels down the entire length of the inside of the filter
cartridge, dislodging the dust from the filter cartridge.
