Bypass - Grundfos CR Installation And Operating Instructions Manual

8.8 Bypass

Install a bypass in the outlet pipe if there is any risk that the pump
may operate against a closed valve in the outlet line. Flow
through the pump is required to ensure that adequate cooling and
lubrication of the pump is maintained. See
for minimum flow rates.
pressures
Elbows should be at least 12" from the bypass opening to prevent
erosion.
Inlet
Fig. 7 Recommended bypass arrangement
Bypass
opening
Inlet
Fig. 8 Optional bypass arrangement
Bypass
opening
Inlet
Fig. 9 Optional bypass arrangement for CR, CRN 32, 45 and
64
7.3 Minimum inlet
Bypass line
Outlet
Bypass line
Outlet
Bypass line
Outlet
15