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Suction line
■ Flooded suction
In flooded suction application, observe the pump inlet N.D. of 1-1/4" (O.D. 31.8mm × I.D. 28mm), the suction
line can be laid to the maximum length of 5.3m with no elbows.
* If five 90° elbows (0.6m resistance at each elbow) are used, the maximum length is shortened to 2.3m.
In suction lift application, observe the maximum suction lift of 1m (operation with clan water at ambient tem-
perature and the max spm).
* The suction lift differs with the liquid’s characteristics, temperature and suction line length. For detailed information, contact us.
■ Filtration (suction line end)
Install a filter or strainer at the suction line end to prevent particles from entering the bellows. The filter or
strainer should not increase piping resistance too much.
NOTE
If wafer fragments enter the pump, they may get stuck in the bellows and eventually cause failure. If they clog the
pump head valves, the discharge volume may reduce and the pumping operation may become unbalanced.
■ When installing a valve on the suction line:
Use a flow coefficient (Cv) of 8.5 or more. Otherwise, a suction-line resistance rises high together with flow
pulsation, or the valve may easily be clogged with the debris crystallized from solution. Make sure all valves on
the suction line are opened to the full during operation.
NOTE
Operating the pump with a suction side valve close, negative pressure increases in the bellows and deforms
the bellows inwardly.
Discharge line
■ When installing a valve on the discharge line:
Select a valve with an orifice equal to or larger than pipe I.D. A valve with a small orifice may increase the pipe
resistance or easily be clogged with the debris crystallized from solution. Always open valves during operation.
Do not close the valve until the discharge pressure reaches "0" after the pump is stopped.
NOTE
Do not close a discharge valve right after stopping the pump. Impact pressure may damage the bellows.
■ Filtration (circulation)
Check a filtering area, filtering performance and effects on the flow before selecting a cycle filter. A desired
flow may not be obtained if selection is wrong.
NOTE
Wet the filter before use. A desired flow may not be obtained if the filter is dry. Filter dries up if it is unused for a
long period. Read the instruction manual of the filter for details.
■ Filtration (discharge line end)
Install a filter or strainer in a discharge line not to release debris or wafer fragments. The filter or strainer should
not increase piping resistance too much.
■ Depressurization at pump stop
When stopping the pump, be sure to release discharge pressure by opening the filter, the air vent valve or
through a return circuit.
NOTE
Stopping the pump without releasing discharge pressure may damage the bellows.
Liquid line piping