6
7 NOTES ON DANGERS DURING
INSTALLATION, OPERATION
AND MAINTENANCE
Safe operation of the valve is only guaranteed
if it has been correctly installed, commissioned
and maintained by qualified personnel
(see “Qualified Personnel”), taking into account
the warning information of these installation
and maintenance instructions.
In addition, compliance with the general
installation and safety regulations for the
pipeline or plant construction, together
with the correct use of tools and protective
equipment, must be ensured. The installation
and maintenance instructions must be
strictly followed when any work is carried
out on the valve or when handling the valve.
Non-observance can result in injuries or
damage to property. When the valve is used
as a final termination, a safety measure e.g.
a blank or dummy flange is recommended
when carrying out maintenance work. When
the valve is installed as an end of line valve,
the information given in DIN EN 294 point 5
must be observed.
NEOTECHA
NTB-NTC BALL VALVES
INSTALLATION AND MAINTENANCE INSTRUCTIONS
8 COMMISSIONING
8.1 General commissioning
Before commissioning, the information relating
to material, pressure and temperature should
be compared with the installation diagram of
the pipeline system.
Tools for increasing the lever or handwheel
torque are not allowed.
Any debris left in the pipeline and valves
(dirt, welding beads, etc.) will inevitably
lead to leakage.
Before each commissioning of a new system or
re-commissioning of a system after repair or
modification, it must be ensured that:
- All installation and assembly work has
been completed in accordance with the
regulations.
- Commissioning is only undertaken by
“Qualified Personnel”.
- The valve is in the correct operating position.
- New protective equipment is installed or
existing protective equipment repaired.
9 USE
9.1 Operation - general
NTB series ball valves should only be used
in the fully open or fully closed position, as
they are not designed for flow regulation.
Intermediate settings can result in turbulence,
leading to vibrations in the pipeline system
which then generates noise. If the flow has to
be regulated, an NTC series C valve should
be used. This type can also be fitted with
various control orifice plates. Refer to the flow
characteristic diagram for NTC control valves.
Operating:
Clockwise to close.
Counter clockwise to open.
9.2 Operation with hand lever
Neotecha ball valves and C valves are
supplied with a hand lever as standard, unless
anything different has been provided (except
DN 150-6” - too high a torque). The hand lever
should always be fitted on the ball valve and
only removed when necessary for maintenance
purposes. When the hand lever points in the
direction of the pipeline, the ball valve is fully
open; when the hand lever is at right angles
to the pipeline, the valve is fully closed. The
hand lever should be turned clockwise to
close the valve.
Nominal diameters 15 to 100 (½” to 4”)
Hand lever with notched plate with 10°
divisions, range 90°
Operating element: detent lever
The hand lever and detent lever must not be
modified. The locking function is otherwise
adversely affected. Damaged hand levers
should be exchanged.
9.3 Operation with drive
Thanks to its modular method of construction,
the NTB-NTC ball valve can be converted to
an automatic drive at any time. In this case
it may be necessary to remove the ball valve
from the pipeline.
When drives or gear units are used, the
instructions of the particular manufacturer
are applicable.
6.10 Final checks
- Checking the ball position as far as the
fully open position.
- Cleaning and flushing the pipeline before
the first closure.
- Repeated opening and closing of the ball
valve, to ensure unrestricted movement
of ball and control shaft.
