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• Prohibited liquids:
The following liquids must not be used:
- Liquids that are easily crystallized
- Liquids containing slurry
- Solvent based fluids
Service life of the valve and bellows is shortened by liquids that are easily crystallized or contain slurry.
Some solvents may cause premature failure due to incompatability with liquid end materials.
4.3 System Safety Precautions
• Ventilate site:
When pumping a hazardous liquid, ventilating the cabinet is advised to remove toxic gas which may
permeate components and build up inside the equipment.
• Monitor operating condition:
Use a monitor, etc. to inspect running condition of the system.
• Advance precautions:
Take advance precautions against pump or system abnormality and perform daily inspections.
• Use clean, dry instrumentation air (CDA) or nitrogen as supply air:
Supply air mixed with water, oil or dust may affect smooth and normal functioning of the pump.
Excessive water in an air chamber may be detected by the leak detection sensor, leading to an alarm
condition.
• Use an appropriate filter:
Select an appropriate filter for the pump, taking into consideration the filtering area, grain-blocking
capacity and flow rate characteristics. Venting of the filter is critical. Some filters, depending on
structure, may have low air bleeding performance and greatly affect capacity. Be aware of liquid
viscosity which may significantly influence flow rate.
• Do not restrict air exhaust port:
CAUTION! Do not restrict air exhaust piping of the pump or pneumatic system. Keep
exhaust lines as short as possible. The bellows may be deformed as a result of excessive
pneumatic backpressure. Quick exhaust valves are recommended.
• Pulse dampeners:
To reduce vibration in the liquid piping system or eliminate pulsation in the liquid flow stream, a full
series of pulsation dampeners are available from Iwaki America.