TECHNICAL MANUAL MT103
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4.4
MONITOR
The monitor is an emergency regulator which takes over from the active regulator if for any reason the latter
permits the downstream pressure to rise up to the value set for its intervention.
When pressure regulator Reflux 819 or incorporated monitor PM/819 are used as monitor, to increase response
time an accelerato is installed.
Installation of accelerator is recommended fo use as safety accessory according to Directive 97/23/EC (PED).
Two alternative solutions are offered for this safety device associated to Reflux 819/FO regulators: incorporated
monitor or in-line monitor.
4.4.1 PM/819 INCORPORATED MONITOR
This emergency device (fig. 16) is fixed directly on the body of the service regulator. In this way, the two pressure
regulators use the same valve body but:
- they are governed by two distinct pilots and two independent servomotors;
- they work on independent valve seats.
Fig. 16
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