PIETRO FIORENTINI NORVAL, Инструкция по установке, пусконаладке и обслуживанию

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TECHNICAL MANUAL MT044
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The modular-type conception of NORVAL series regulators means that it is also possible to fit the slam-shut
incorporated with the body itself even after the installation of the regulator.
Furthermore, the regulator can be adapted for operation as an in-line monitor by installing a special device.
4.1 INCORPORATED SLAM-SHUT I-N
This is a device (fig. 7) which immediately blocks the gas flow if, following some kind of failure, the downstream
pressure reaches the set-point for its intervention or if it is operated manually.
The main characteristics of the slam-shut device are:
• design pressure: 18.9 bar for all the components;
• intervention with pressure increase and/or decrease;
• intervention accuracy (AG): ± 1% of the pressure set-point for pressure increases, ± 5% for pressure decreases;
• incorporated by-pass for balancing the pressures and facilitating the resetting of the device.
• push-button manual control.
4.0 MODULARITY
...+ I-N SLAM-SHUT
Fig. 7