7
NEOTECHA
NTB-NTC BALL VALVES
INSTALLATION AND MAINTENANCE INSTRUCTIONS
11 CAUSE AND REMEDY OF OPERATING
FAULTS
If the valve function or operating action is
faulty, a check should be made to ensure that
the assembly and installation work has been
carried out and completed in accordance with
the installation and maintenance instructions.
The information relating to material, pressure,
temperature and direction of flow should be
compared with the installation diagram of the
pipeline system. Furthermore, a check should
be made on whether the installation conditions
correspond to the technical data given in the
data sheet or on the rating plate.
The safety regulations must always
be observed when troubleshooting.
Repair work must only be carried out by
the manufacturer’s trained personnel.
12 DECOMMISSIONING
Removal of the valve for repair or servicing is
often carried out carelessly, as the valve has to
be repaired or replaced in any case. However, it
is recommended that the valve is removed with
care, without damaging the PTFE, so that the
possible cause of damage can be determined
after removal.
13 SPARE PARTS
Always provide the information in accordance
with the rating plate fitted on the mounting
flange when ordering seals and other
spare parts.
14 DISPOSAL
Hand in the correctly cleaned valve to the
scrap material recycling plant.
Badly cleaned valves can cause severe burning
of the hands and other parts of the body.
If the valve is passed on to a third party, the
manufacturer no longer guarantees the valve.
10 SERVICING AND MAINTENANCE
No routine maintenance or lubrication is
required. However, for systems with high
temperatures, an inspection for leakage at
the flanges should be carried out shortly after
installation. The large difference between
the temperature related expansions of PTFE
and some metals can result in cold flow.
Tightening the bolts once again will eliminate
this problem. This process may possibly have to
be repeated several times. We recommend that
the valve is operated at least once a month.
ATTENTION!
Check that the pipe is depressurized and drained.
With corrosive, inflammable, aggressive or toxic
media, ventilate the pipeline system.
- Only allow assembly work to be carried out
by qualified personnel.
- Almost fully close the valve (note position
of the flat sections of the control shaft).
- Loosen all flange bolts and withdraw
them until the valve can be removed.
- Spread the flanges apart using a suitable
tool and withdraw the valve.
