Watson-Marlow 520DUN User Manual page 93

520RE
Performance figures for the 520REL and 520REM have been recorded against 2bar
peak pressure and 4bar peak pressure respectively.
Performance figures for the 520REH have been recorded against 7bar constant pressure.
Although the 520REL is rated to 2bar (30psi) peak pressure, the 520REM is rated to
4bar (60psi) peak pressure and the 520REH is rated to 7bar (100psi) constant pres-
sure, the pumps will generate in excess of these pressures if the system pressures
exceed this. Where it is important that these rated pressures are not exceeded,
pressure relief valves should be installed in the pipeline.
Flow rates are normalised test values obtained using 520 elements and the pump-
head rotating anticlockwise pumping water at 20C with negligible inlet and discharge
pressures.
Watson-Marlow 520DuN IP66/NEMA 4X User Manual 93