Società Generale Impianti Gas

Via Fontana,18 – 20122 Milano (MI)
+39  0524  894111 

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Excess flow valves

Excess flow valves


The excess flow valve is a safety equipment mainly installed on gas storage tanks which allow to mechanically stop the flow of product if the flow rate exceeds the maximum design value.
The valve shutter is moved into the closing position if the thrust of the liquid becomes high enough to determine the compression of the retaining spring: the thrust is directly proportional to the flow rate or the differential pressure.
Different versions of springs are available, in order to provide different required maximum flow rate , in accordance with the design needs.
The body of this valve is fully machinied, (it is not welded) thus resulting in a more robust structure with a lower risk of presence of cracks.


  • Max operating pressure(PS): 40bar;
  • Test pressure (PT): 57,5bar;
  • Max operating temperature (TS min/max): -10°/+50°C;
  • Liquid: LPG (mix Propano-Butano) e fluidi del gruppo 1 e 2;
  • PED cathegory: II^ category (Tab.6 e 7 all.II – pipes, art. 3, point 1.3, letter a), ).


Galvanised, thickness of the protection leyer from12 to 16μm.


  • N.1 Body in carbon steel, A105;
  • N.1 Shutter in stainless steel AISI 304;
  • N.1 Spring in stainless steel AISI 304.
  • On request the valve can be provided with ANSI 300 flanges.


  • Directive machinery 2021/0105/COD
  • EMC 2014/30/UE
  • PED 2014/68/UE
  • ATEX 2014/34/UE
  • European StandardEN 12516-2:2004


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Società Generale Impianti Gas Spa

Registered Office: Via Fontana,18 – 20122 Milano
Operative Office: Via San Faustino 28 – 43036 Fidenza (PR)

Capitale Sociale/Share capital € 5.000.000,00 i.v.
P.iva/VAT Number: 01274370152

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