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