14
Flushing the seal system
In order to prevent a dry run and to ensure a proper working sealing system a seal
flush is recommended.
Flushing fluid at atmospheric pressure—usually water—flushes the area behind the seal system and
prevents the product from hardening and damaging the seal system. If a static flushing device is fitted,
the flushing fluid fills the area behind the seal.
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The flushing medium must be at least suitable to the product being pumped. It should not contain
abrasive particles, which would damage the seals. We recommend that transparent plastic tubes are
used as flushing tubes.
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It can also be used to create a (bacteria tight) barrier to the atmosphere.
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The single mechanical seal should be flushed without pressure: the flushing fluid should be allowed to
drain from the system without pressure. The double mechanical seal can be used pressureless or
alternatively with an overpressure.
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Fill the pump with liquid to prevent it from running dry, possibly via a separate intake valve
connected to the suction or pressure pipe.
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If your pump is set up for permanent flushing, always check the intake and outlet (see diagram
below).
INTAKE
OUTLET
14.1 Dynamic flushing
The picture shows a tube connected for the flush system. The tubing should have an outer diameter of
8mm or connection with G1/8 thread.
The picture shows tubes installed for flushing.
You should connect the tubes to the highest possible point (outlet) and the lowest possible point
(intake), so that there is a 180° angle between them.
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