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3 Design and principle of oper-
ation
The supply pressure regulator is used to
supply pneumatic measuring and control
equipment with a constant air supply. The
maximum 12 bar pressure of the compressed
air network in a plant is reduced to an
adjustable minimum pressure between 0.5
and 6 bar.
The compressed air at the inlet (supply) flows
across the filter and leaves the output at a
Supply
(not in view)
Pressure gauge
Fig. 1: Components of Type 4708-45 Supply Pressure Regulator (aluminum version)
EB 8546-1 EN
Design and principle of operation
reduced pressure depending on the set point
adjusted. The plug is balanced to eliminate
the forces created by the upstream pressure
acting on the plug.
Any water contained in the compressed air
is separated and collected as condensate in
the filter receptacle, which must be mounted
suspended downwards. The collected con-
densate in the filter receptacle can be
drained off by briefly pushing the drain
plug.
Cap
(to cover set point adjuster)
Cover
Second connection G
(not in view) for pressure
gauge or pilot valves
Output
Fastening bore
Filter receptacle
Filter cartridge
Drain plug to drain
off condensate
1
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