Main Features - PIETRO FIORENTINI SBC 187 Technical Manual

Technical Manual MT 188-E
1.0 INTRODUCTION
This manual aims at supplying essential information on the
installation, commissioning,
maintenance of the valve SBC 187.
Moreover, it is deemed suitable to provide the reader with a brief
description of the main features of the valve and its accessories.
1.1

MAIN FEATURES

This is a device immediately blocking the gas flow, either if pressure
inside a piping reaches the preset value for its tripping due to any fault
or if it is enabled manually.
The main features of this valve are:
Design pressure PS: 220 bar;
•
Operating temperature: -20°C / + 60 °C;
•
Ambient temperature: -20°C / + 60 °C;
•
Tripping due to pressure increase and/or decrease
•
Tripping range due to pressure increase Wdo: 2 / 90 bar;
•
Tripping range due to pressure decrease Wdu: 0.2 / 90 bar;
•
Accuracy (AG): 1% of the calibration value in case of
•
pressure increase; 5% of the calibration value in case of
pressure decrease;
External manual bypass by means of a hand wheel to
•
obtain pressure balancing and ease the restoration of the
device;
Manual tripping control by means of push-button.
•
1.2 OPERATION OF THE VALVE SBC 187
(Fig. 1)
The slam-shut device consists of an obturator A, a control head B, a
lever mechanism system for the release C and a restoration system D
controlled manually through the lever.
Fig. 1
The pressure of the circuit to be controlled acts on the control head
with a force opposing the forces of the setting springs for maximum
and minimum pressure calibrated to the pre-set values.
disassembly, reassembly,
The translation movement causes the shifting of the lever mechanisms
controlling the release E of the entire mobile system freeing the
obturator, which closes due to the action of the spring F.
and
In order to restore the device, act on the lever D after having balanced
the pressure on the obturator by feeding pressure through the manual
bypass storage system with which the valve is equipped.
After the restoration close the bypass.
The release can be controlled also manually using the suitable button.
Fig. 2
Fig. 3 BYPASS
4