PIETRO FIORENTINI ASX 176, Translation Of Original Instructions

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41
ASX 176
Use, maintenance and warning instructions
HIGH PRESSURE REGULATOR | DESCRIPTION AND OPERATION | REV. 00
EN
BUILT-IN MONITOR OPERATION
NOTICE!
To check the position of the plug (3), look at the position of the stroke indicator rod (8) referring to the
glass cover (9):
• fully open 100%;
• closed 0%.
In depressurised conditions, the plug (3) is kept in a shut-off position by the spring (4) and rests on the reinforced gasket
(5).
The upstream pressure (Pu), although variable, does not change this position as the plug (3) is fully balanced.
The position of the plug (3) is controlled by the movements of the diaphragm (6) that the forces act on:
• during shut-off: the load of the spring (4) and thrust resulting from the downstream pressure (Pd) in the chamber (C),
• in opening: towards the open position: the thrust resulting from the loading pressure (Pm) in the chamber (D), supplied
by the pilot (7).
7
6
D
2
4
3
C 5
8
9
U
pstream pressUre
D
ownstream pressUre
p
re
-
regULator pressUre
m
onitor LoaDing pressUre
Fig. 4.5. Built-in monitor operation