Gnali Bocia - VB100-300-500 - Shut Off Valves

The safety shut-off valves VB are designed as safety devices of gas plants for civil, industrial and commercial applications. They are suitable for low, medium and high pressure.

They are direct acting type and they could be setted for pressure increase (over pressure OPSO) or pressure decrease (under pressure UPSO). The VB safety devices are “top entry” design, which allows an easy maintenance without removing the body from the line.

Shut Off Valve - VB100-300-500

Technical Features

Description VB 100 VB 300 VB 500
Nominal diameters (threaded - flanged) 1” x 1”
DN 25 x 25
1”½ x 1” ½
DN 40 x 40
2” x 2”
DN 50 x 50
Body size 1” 1” ½ 2”
Connections Threaded EN 10226 or NPT
Flanged  UNI (PN) - ANSI
Inlet pressure range BP-MP 0,5 ÷ 10 bar / 7,5÷145 psi TR 0,5 ÷ 20 bar / 7,5÷290 psi
Setting pressure range 6 ÷ 5800 mbar / 0,09÷84 psi
Accuracy class % 5 / 10
Design temperature -20 ÷ +60 °C
Design Pressure 20 bar / 290 psi
Acceptable gases Natural gas, town gas, lpg, nitrogen, air, any non-corrosive gas
Design Pressure EN 14382/Pressure Equipment Directive 2014/68/UE (PED)
CE-1370-PED-B-GBV 001-13-ITA-revB (Bureau Veritas) (CE mark)


The VB shut-off valve, also called pressure switch valve SSV or UPSO-OPSO, have the scope to stop the gas flow when downstream pressure comes out of its operating range. VB shut-off valve may be integrated with FG pressure regulators (FGB version) or as a single device. These devices are suitable for use with non-corrosive gases, previously filtered. The VB series shut-off valve are widely used in natural gas, manufactured and LPG plants, in both civil and industrial installations.

Main Features

- Design according to EN 14382: 2009

- 2 different connections:
* threaded type;
* flanged type;

- Extreme simplicity and rapidity of maintenance (top entry design);

- Compact design;

- Interruption of gas flow for both over pressure and under pressure (UPSO-OPSO), or for over pressure only (OPSO).

Product DATASHEET - VB 100-300-500 - Shut Off Valves