45
ASX 176
Use, maintenance and warning instructions
HIGH PRESSURE REGULATOR
|
DESCRIPTION AND OPERATION
|
REV. 00
EN
In the event of failure of the main regulator (2), the PM/176 monitor (1) will be tripped until the pre-set downstream pressure
has been reached.
Operating conditions
Operating consequences
Concluding outcome
Decrease in downstream
pressure (Pd) due to:
• increase in the request-
ed flow rate;
• or decrease in upstream
pressure (Up).
Imbalance between the pressure force in the
chamber (A) and the calibration spring (3) of the
pilot (4) which causes:
• increased opening of the pilot (4) plug (5);
• consequent increase in the value of the load-
ing pressure (Pm), inside the chamber (B).
Opening of the plug (7) of the
PM/176 monitor (1) until the
equilibrium of forces between
the downstream pressure (Pd)
in the chamber (A) and the cali-
bration spring (3) of the pilot (4)
has been restored.
Increase in downstream
pressure (Pd) with the pilot
(4) plug (5) being moved to
the shut-off position.
Move the plug (7) of the PM/176 monitor (1) to the
shut-off position for:
• the decrease in the loading pressure (Pm)
due to the transfer of this pressure between
the chambers (B) and (C) of the regulator (2)
through the transfer hole (9);
• force applied by the spring (6).
Return of the downstream
pressure (Pd) to the predeter-
mined value and to the balance
of forces between the down-
stream pressure (Pd) in the
chamber (A) and the calibration
spring (3) of the pilot (4).
Tab. 4.19.
Summary of Contents for ASX 176
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