IWAKI PUMPS FW-20H, Инструкция по эксплуатации

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Discharge line
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The pipe resistance increases as a discharge line becomes longer or the number of bends increases. In
order to decrease pipe resistance, install a dampener and minimizes pulsation.
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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 crystals. Always open valves during operation. Do not close the valve until
the discharge pressure reaches "0" after the pump is stopped.
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