Under Ground Hydrant

NAFFCO under ground fire hydrants are valves of screw down type and are suitable for a maximum working pressure of 16 bar.

The underground fire hydrants are manufactured to comply to BS 750:2012 and EN 14339:2005 standards with screwed outlet threaded to BS 336:2010 standard.


Model NHYD058
Valve Type Screw down (type 2C)
Nominal Size & Flange Drilling Flange-X
Flange-Y
Flange-Z
PN16, DN80, BS EN 1092-2
PN16, DN80, BS EN 1092-2
PN16, DN80, BS EN 1092-3
Working Pressure 16 Bar maximum
Test Pressure (Body) Body 25 Bar
Seat 20 Bar
Flange Drilling BS 4504 Part : 2 : 1974 Table : 16/21
  • BSI Kitemark certified
  • Body material made of grey cast iron to BS 1503-3
  • Material of spindle and threaded part of valves which engages with it is made of stainless steel to BS 10088-1
  • Material for the screwed outlet is made of high tensile brass to BS 12163:2011
  • Spindle sealings (two seals) is of the toroidal sealing ring ('0' ring) type and are capable of changing while the valve is under pressure and fully closed
  • A wiper ring is positioned above the spindle sealing’s to prevent the ingress of foreign matter
  • Each hydrant shot is blasted (inside and outside) to SA 2 1/2 std
  • All cast iron parts are thoroughly cleaned and painted

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