DEC PTS 50 - Page 9

MAN-PTS-GB, Revision 9, BSC, 15-FEB-2017 9/46
The PTS consists of a cylindrical chamber with a tangential inlet and a filtration membrane at the
top. The system is equipped with 4 pneumatic valves (inlet valve V1, outlet valve V2, vacuum
valve V3, and pressure valve V4) connected to a pneumatic or electro-pneumatic control
cabinet.
The operating principle is as simple as it is efficient. The PTS chamber is filled and emptied in a
cyclic manner by alternating a source of vacuum and pressure. A flat filtration membrane,
installed in the upper part of the system, prevents fine particles from entering the vacuum system.
In order to guarantee its suction capacity from the beginning to the end of the transfer, the
membrane is cleaned with each emptying cycle in a countercurrent fashion by compressed air
or inert gas.
Powder is sucked in by opening the inlet valve V1 and the vacuum valve V3 connected to a
vacuum source (vacuum pump). The PTS chamber is emptied by opening the outlet valve V2
and the pressure valve V4 (compressed air or nitrogen).
VACUUM
PUMP
NITROGEN
POWDER
1
2
3
7
6
5
4
1. PTS BODY
2. PTS MEMBRANE
3. PTS COVER
4. POWDER OUTLET VALVE
5. POWDER INLET VALVE
6. VACUUM VALVE
7. NITROGEN VALVE
Valve open
VACUUM
PUMP
NITROGEN
POWDER
7
6
5
4
POWDER
SHUT-DOWN
SUCTION PHASE
VACUUM
PUMP
NITROGEN
7
6
5
4
EMPTYING PHASE
Valve closed