46
ASX 176
EN
Use, maintenance and warning instructions
HIGH PRESSURE REGULATOR
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DESCRIPTION AND OPERATION
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REV. 00
4.5.2.2 - M/A ACCELERATING VALVE
NOTICE!
For the monitor to be used as a safety accessory according to “PED” Directive 2014/68/EU, installing the
M/A accelerating valve is recommended.
In the event of a malfunction of the main regulator (2), the M/A accelerating valve (3) is installed to speed up tripping of the
built-in PM/176 monitor (1).
The M/A accelerating valve (3), based on a downstream pressure signal (Pd), discharges the gas contained in the loading
chamber of the monitor into the atmosphere, thus enabling more rapid tripping.
The calibration of the M/A accelerating valve:
• must be higher than the shut-off pressure of the monitor (1) with reference to the specific SG value;
• is carried out by turning the adjusting screw (4) clockwise or anti-clockwise to increase or decrease its value.
2
1
4
3
U
pstream
pressUre
D
ownstream
pressUre
p
re
-
regULator
press
.
m
onitor
LoaDing
pressUre
Fig. 4.8. M/A accelerating valve
Содержание ASX 176
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