Excess flow valves

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FEATURES:
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.

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DESIGN REFERENCES:

  • PED 97/23/CE;
  • ATEX 94/9/CE;
  • 2006/42/CE;
  • 2004/108/CE;
  • EN 12516-2:2004.

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MAIN COMPONENTS:

  • 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.

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TECHNICAL CHARACTERISTICS:

  • 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), ).

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

DIMENSIONS AND MODELS:

 

DN Code A (mm) B (mm) Flow rate Liquid (m3/h)
20 211/001/02P 140 105 6
25 211/001/03P 140 115 9
32 211/001/04P 140 140 17
40 211/001/05P 140 150 23
50 211/001/06P 140 165 38
65 211/001/07P 140 185 55
80 211/001/08P 140 200 85
100 211/001/09P 185 235 145


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