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NEOTECHA NTB-NTC BALL VALVES
INSTALLATION AND MAINTENANCE INSTRUCTIONS
2.2.3 Pressure-temperature diagram for
NTB-NTC ball valves
Vacuum
0.1 mbar
2.2.4 Flow characteristic for NTC control valves
(without control orifice plate)
Angular
position
2.2.5 Usage restrictions
Before the valve is installed, a check should be
made on the extent to which the coating of the
surfaces is resistant to the intended medium.
The same applies to stainless steel valves with
no additional coating. Refer to appropriate
literature or consult the manufacturer or
distributor for advice on this.
2.2.6 Modification prohibition
Mechanical modifications to the valves or the
use of other manufacturer's parts for repair
purposes are not permissible, as otherwise
safety is no longer guaranteed. Repair work
must only be carried out by the manufacturer's
trained personnel. The manufacturer and
supplier will accept no liability in the event
of misuse.
2.2.7 Warning about foreseeable misuse
Valves and their accessories (e.g. operating
elements) must not be misused as
climbing aids.
2.2.8 Duty to comply with the instructions
for operation, maintenance and servicing
These instructions form part of the delivery
package and must be easily accessible to the
user. They should be protected from soiling
and kept in a suitable place.
3 SOURCES OF DANGER
3.1 External chemical effects
The valve body is either made of stainless steel
or is coated with a 2-part polyester paint. The
coating can be attacked externally by strong
solvents, leading to corrosion of the body.
If damage of this nature occurs, the effects
on the environment should be investigated
and the damage to the coating made good
in accordance with the manufacturer's data.
Stainless steel valve bodies are not suitable
for use with chlorine gas.
3.2 Mechanical
When using hand levers and handwheels,
it should be ensured that there is sufficient
clearance everywhere for the operator's
hands, so that there is no risk of trapping.
3.3 Electrical
If static charges can lead to explosions,
the valve must be earthed by means of
the appropriate earthing accessory. As an
alternative, valves with electrically conductive
linings are available. For more information,
please contact the supplier or manufacturer.
3.4 Thermal
The operating temperature of the valve can
be up to a maximum of 200°C. Suitable
precautions should be taken to protect against
burns due to high or freezing temperatures.
In particular, insulated gloves should be worn
when using the hand lever, for example. In case
of fire, the mechanical strength of the PTFE
seals is no longer guaranteed above 200°C.
2
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