
5 | Setting up / assembly / integration of the filter unit
HYDAC FILTER SYSTEMS GMBH
40 / 84
MoWa OF5 S_N 3160336d en-us lq
5.1 Avoiding siphoning
If there is a height difference (ΔH) between the suction side
and pressure side container/system, the lower line can develop
a suction effect and trigger the siphoning effect between the
communicating containers/systems. This siphoning effect also
occurs when fluid is pumped in a pre-pressurized reservoir.
Fig. 12:
Avoiding siphoning
NOTICE
Siphoning effect
Reservoir overflowing/leaking = oil spill
u
Remove the ends of the hoses from the reservoir after op-
eration or shut the shut-off device in the suction line.
After the filter unit is switched off, the height difference/primary
pressure can cause flow to occur both in the feed direction and
against the feed direction and the fluid can leak uncontrollably.