DEC PTS 50 - Page 16

MAN-PTS-GB, Revision 9, BSC, 15-FEB-2017 16/46
After a predetermined time, the inlet
valve V1 opens. The product is sucked
into the chamber with the vacuum
created by the vacuum pump.
After a given time, when sufficient
powder has been filled into the PTS
chamber, inlet valve V1 closes (the filling
rate is controlled by a timer).
The vacuum valve V3 remains open in
order to evacuate the residual air still
present in the chamber.
When the vacuum valve V3 closes, the
valve V4, which is connected to a
pressure source (compressed gas),
opens. The gas used for the system can
be selected according to the process
conditions. Compressed air or nitrogen is
used in most cases. The residual vacuum
is eliminated by opening the pressure
valve V4, and the chamber is put under
pressure.
The product outlet valve V2 can then
open. The chamber is emptied by the
pressure effect and the product is
introduced into the receiver. The filter is
cleaned in a countercurrent fashion
during the discharge cycle by the
stream of gas. This allows maintaining
the initial suction capacity for the next
cycle. The outlet and pressure valves V2
and V4 close after a given time.
VACUUM
PUMP
PRESSURE
POWDER
V1
Valve closed
Valve open
V2
V3
V4
VACUUM
PUMP
PRESSURE
POWDER
V1
Valve closed
Valve open
V2
V3
V4
VACUUM
PUMP
PRESSURE
POWDER
V1
Valve closed
Valve open
V2
V3
V4
VACUUM
PUMP
PRESSURE
POWDER
V1
Valve closed
Valve open
V2
V3
V4