Festo MPA Series - Page 43

1. Summary of components
1−25
Festo P.BE−MPA−EN en 0910d
P pressure regulating
valve (identification PF, PA)
Mode of operation:
Supply process:
The P pressure regulating valve regulates the pressure in
front of the valve in duct (1) (P). This provides the same
regulated working air pressure in channels (2) and (4).
Exhaust process:
The exhaust flow is from channel (2) to channel (3) and from
channel (4) to channel (5).
The advantages of this pressure regulating valve are:
 The pressure regulating valve is not affected by exhausting,
since the pressure is regulated upstream of the valve.
 The pressure regulating valve can always be adjusted
because the pressure from the valve terminal is always
present.
Application example:
An equal working pressure is required at working
lines(2)and (4).
A lower air pressure (e.g. 3 bar) is required than the
operating pressure present at the valve terminal
(e.g.8bar).
B or A pressure regulator
(Ident. code PH, PC, PG,
PB)
Mode of operation of the B pressure regulating valve:
Supply process:
The B pressure regulating valve regulates the working
pressure in channel (2) after the pressure medium flows
through the valve. The exhaust air is channelled through the
intermediate plate and switched from channel (4) to
channel(5) in the valve.
Exhaust process:
During venting, the exhaust flow in the valve is unregulated
from channel (2) to channel (3) via the pressure regulating
valve.