Operation - PIETRO FIORENTINI FE Series Manual

4.2 -

OPERATION

SERIES FE equipment consists of regulators featuring:
• self-operation;
• low pressure suitability;
• a dual regulation stage.
Tab. 4.14. describes the operation of the equipment in a simplified manner:
Step Description
1 The upstream pressure (A) feeds the regulator.
2 The first regulation stage (B) determines the first pressure reduction.
Intermediate pressure is adjusted by the second regulation stage (C) to the value of the downstream pressure
3
(D) required by the user.
In the event of faults, the safety devices will trip:
• relief valve (E);
4
• excess flow lock-up device (F);
• slam-shut valve for maximum downstream pressure (G).
A
U
pstream pressUre
LOW-PRESSURE GAS REGULATOR
EN
Use, maintenance and warning manual
D
A
E
| DESCRIPTION AND OPERATION
C
D
B
F
I
ntermedIate pressUre
Fig. 4.2. Operation SERIES FE
| REV. 00
Tab. 4.14.
G
d
ownstream pressUre
28