SNB-SNC ball valves
Installation and Maintenance Instructions
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page 2
Angular position
2.3.4. Flow characteristic for SNC control valves (without control orifice plate)
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.
2.3.5. 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.
2.3.6. 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.
2.3.7. Warning about foreseeable misuse
Valves and their accessories (e.g. operating elements) must not be misused as climbing
aids.
2.3.8. 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.
