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7.2 Trouble shooting guide
WARNING
Excessive torque may damage the hydrant body and result in uncontrolled water leakage of up to 16 bar. In this case, further work on
the hydrant must be stopped immediately and a safe distance to the hydrant must be maintained, especially directly above the hydrant.
Isolating valve installed upstream the hydrant must be closed immediately in order to stop the supply of water.
In any case, if the seating area of hydrant is damaged, replacement of the complete hydrant must be carried out.
TROUBLE
Leakage at the top of the bonnet around the
stem
Leakage between the bonnet and the body
The hydrant is not closing
The hydrant is not opening
Hydrant is leaking
Table 5: Trouble shooting guide
ROOT CAUSE
Stuffing nut in wrong position
Defective Stuffing nut
Defective O-rings
Defective gasket
Upstream isolating valve is closed
Defective operating nut
Foreign body between the shut-off cone and
seating area
Curved operating stem
Large deposits and incrustations in the
seating and guiding area
Stuffing nut in wrong position
Defective Stuffing nut
Upstream isolating valve is closed
Defective operating nut
Foreign body below shut-off cone
Curved operating stem
Large deposits and incrustations in the
seating and guiding area
Stuffing nut in wrong position
Defective Stuffing nut
Shut-off cone damage
Large deposits and incrustations in the
seating area
The technical data and performance may be modified
without prior notice depending on the technical advances.
SOLUTION
Stop to operate the hydrant and change the
complete Bonnet
Stop to operate the hydrant and change the
complete Bonnet
Change O-rings
Change the gasket between body and bonnet
Check the opening/or open the upstream
isolating valve and try again to close the
hydrant
Replace operating nut
Open the hydrant to make a flush out. If it is
not working: remove the inside trim of the
hydrant and remove the foreign body.
Replace operating stem
Remove the inside trim of the hydrant and
clean the seating and guiding area
Stop to operate the hydrant and change the
complete Bonnet
Stop to operate the hydrant and change the
complete Bonnet
Check the opening/or open the upstream
isolating valve and try again to close the
hydrant
Replace operating nut
Remove the inside trim of the hydrant and
remove the foreign body.
Replace operating stem
Remove the inside trim of the hydrant and
clean the seating and guiding area
Stop to operate the hydrant and change the
complete Bonnet
Stop to operate the hydrant and change the
complete Bonnet
Replace shut-off cone or inside trim
Remove the inside trim of the hydrant and
clean the seating area. If the seating area is
damaged, the replacement of the complete
hydrant must be carried out.
IOM_FIH210201_HALIOS STD-PREM_EN
P14/19
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