Festo MPA-C Series Manual page 32

3 Mounting and installation
3.4.3 Vacuum / low-pressure operation:
Note
If valves are used for switching a vacuum, filters must be used in the suction line to
avoid malfunctions caused by foreign matter sucked into the line.
The 2x 2/2-way valves with ident. code D, I and the 2x 3/2-way valves with ident. code
N, K, H are not suitable for vacuum or low pressure operation (–0.9 ... 3 bar). If you sup-
ply the valve terminal with operating pressure between (–0.9 ... 3 bar) via port (1):
• Operate the above-mentioned valves in a separate pressure zone.
the
• Set
( Appendix A, Fig. A.2)
The following requirements must be fulfilled in order to operate your valve terminal at the supply port
(1) with operating pressure between –0.9 ... 3 bar:
– The pilot control is operated with regulated external pilot air supply die (pilot pressure
Fig. A.1, Fig. A.2).
– The valve terminal must be equipped only with the following valves and, if necessary, have addition-
al pressure zones.
Pressure zone supply via port
(1)
Pressure zone with operating
pressure between
1)
–0.9 ... 3 bar
Pressure zone with operating
pressure > 3 bar
1) The valves with ident. code D, H, I, K, and N are not suited for vacuum or low-pressure operation!
Tab. 3.2 Valves for vacuum and low pressure operation
Valve with ident. code W and X, 3/2-way valve:
– These valves are supplied individually, independent of the supply port (1).
– The valves can be operated in the range of von –0.9 ... 8 bar.
– The pilot air is supplied through the valve terminal.
– The connections via which these valves are supplied with compressed air or vacuum
and via which exhaust air is removed are shown in Tab. 3.3.
32
operating pressure for this pressure zone in accordance with the diagram
.
Applicable valve
– 5/2-way valve, monostable (ident. code M and MS)
– 5/2-way bistable valve (ident. code J)
– 5/3-way valves (ident. code B, E and G)
– 2x 3/2-way valves (ident. code HS, KS and NS)
– 3/2-way valve (ident. code W and X)
– 2x 2/2-way valve (ident. code DS)
– All above valves
– 2x 3/2-way valves (ident. code H, K and N)
– 2x 2/2-way valves (ident. code D and I)
Festo – GDCV-MPAC-EN – 1407NH – English
Appendix A,