Grundfos CR 1s Installation And Operating Instructions Manual page 4

Tandem seal arrangement with flushing-liquid supply
Fig. 2
In fig. 2, the flushing liquid enters the seal chamber via a pipe
from an elevated tank. The flushing liquid in the seal chamber
prevents leakage of pumped liquid to the environment.
No heat is dissipated from the system.
C/D
Outlet 1/2"
Tandem seal arrangement with flushing liquid
Fig. 3
connected to a drain
In fig. 3, the flushing liquid enters the seal chamber via a pipe
from a central flushing system.
In case of seal leakage, the pumped liquid is washed away to the
drain by the flushing liquid.
C/D
Outlet 1/2"
E
Inlet 1/2"
Sensor
Seal chamber CR, CRI, CRN 1s, 1, 3, 5
Fig. 4
4
E
Inlet 1/2"
E
Inlet 1/2"
C/D
A
E
C/D
A
Sensor
E
Inlet 1/2"
Seal chamber CR, CRI, CRN 10, 15, 20
Fig. 5
Warning
If the flushing-liquid supply pipe is inserted more
than 9 mm into the seal chamber, it will damage
the shaft seal. This applies to both inlet and
outlet.
C/D
Inlet 1/2"
E
A