Avoid Siphoning - HYDAC FILTER SYSTEMS OF7 Operating And Maintenance Instructions Manual

Avoid siphoning

Siphoning effect
Tanks overflowing/leaking = oil spill
Remove the ends of the hoses from the tanks after operation.
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If there is a height different (Δh) between the suction-side and pressure-side
tanks, a suction effect can develop in the hose that is lower down, causing
the fluid levels to equalize in accordance with a principle of communicating
vessels (siphoning). This siphoning effect also occurs when fluid is pumped
in a pre-pressurized tank.
When the 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.
OF7S / OF7K
BeWa OF7 3430048e en-us 2016-04-28.doc
NOTICE
en(us)
Unit in operation
Page 41 / 68
2016-04-28