PIETRO FIORENTINI NORVAL

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Technical Manual53 pages

Questions and Answers

S
Susan RomeroAug 12, 2025
What to do if there is a pressure increase at Q>0 in PIETRO FIORENTINI NORVAL Controller?
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  Robert SmithAug 12, 2025
  If the pressure increases when Q>0 in your PIETRO FIORENTINI Controller, it could be due to several reasons. The reinforced gasket [4] might be damaged and require replacement. Alternatively, the shaft could be locked by incrustation during start-up, necessitating cleaning. A setting higher than the spring limit may require a spring replacement. The diaphragm [20] may be ruptured, also requiring replacement. An incorrect assembly of diaphragm [29] should be fixed. Finally, there might be no sensing signal from the take-off, which needs to be checked.
J
Jerry CooperAug 15, 2025
How to troubleshoot operating anomalies in PIETRO FIORENTINI NORVAL Controller?
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  David JohnsonAug 15, 2025
  If your PIETRO FIORENTINI Controller exhibits operating anomalies, several factors could be responsible. It may be due to dirt, in which case cleaning the parts subject to movement is advised. The anti-pumping valve might not be suitable for the installation, requiring adjustment or replacement of the internal part. A worn compensating diaphragm [29] should be replaced. Check for incorrect assembly of diaphragm [20] or compensating diaphragm [29]. The setting spring [41] should be checked and replaced if necessary. A reinforced gasket [4] with the wrong hardness should be replaced, and an incorrect sensing line take-off arrangement should be changed.
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margaret37Aug 19, 2025
Why is there a pressure drop in my PIETRO FIORENTINI Controller?
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  ploveAug 19, 2025
  If the PIETRO FIORENTINI Controller experiences a pressure drop, it could be because the demand is higher than the regulator flow rate, necessitating a replacement. Alternatively, there might be no pressure upstream, in which case you should check any line filter.
T
Tina WeberAug 23, 2025
What to do if rearming is not possible in PIETRO FIORENTINI NORVAL Controller?
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  robinsonmelissaAug 23, 2025
  If the PIETRO FIORENTINI Controller's rearming is not possible, it could be due to the persistence of the cause which led to pressure increase or decrease downstream, requiring you to decrease or increase the downstream pressure. Another cause might be a broken or chipped lever system, in which case you should change the standard box containing the assembly outside the regulator.
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John GreenAug 27, 2025
Why does my PIETRO FIORENTINI NORVAL Controller have no tightness at Q=0?
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  Virginia MillerAug 27, 2025
  If the PIETRO FIORENTINI Controller has no tightness at Q=0, it could be due to a damaged reinforced gasket [4], which should be replaced. Alternatively, the valve seat might be dented, in which case it should be ground or replaced.
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pchambersAug 30, 2025
How to fix incorrect intervention pressure in PIETRO FIORENTINI NORVAL Controller?
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  Alexis CooperAug 31, 2025
  If the PIETRO FIORENTINI Controller exhibits incorrect intervention pressure, it could be due to a wrong setting of the maximum and/or minimum spring. In this case, make the setting again using the rings [12] and/or [13]. Another possible cause is friction in the lever system, which would require changing the box containing the whole assembly.
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Eric SanchezSep 3, 2025
Why is there leakage from slam-shut obturator in PIETRO FIORENTINI Controller?
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  Edward JohnsonSep 3, 2025
  If there's leakage from the slam-shut obturator in your PIETRO FIORENTINI Controller, it could be because the obturator gasket [10] is deteriorated, requiring you to change the gasket. Another reason could be a worn O-ring [66], which should be changed. Finally, the obturator seat [7] might be eroded or pitted, which means you should change the seat.
C
Christopher LloydSep 7, 2025
What to do if the slam-shut obturator does not close in PIETRO FIORENTINI NORVAL?
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  Margaret SmithSep 7, 2025
  If the slam-shut obturator does not close in your PIETRO FIORENTINI Controller, the control diaphragm [16] may be ruptured. You should change the diaphragm.