For pumps with side housing made from plastic (PE and PTFE, also electrically conductive), the backwash system allows for the removal of residues from pipes and pumps. A bypass line is introduced into the side housing for the pump. The bypass line is opened via manual valves. Care should be taken to ensure that the manual valve is turned by max. 10 mm since the lift on manual valves is not limited. The bypass line can also be opened using pneumatically operated valves.

For this, a valve control pressure of at least 3.0 bar is required. For pumps with side housing made from metal (aluminium, grey cast iron and stainless steel), the backwash system allows for the removal of residues from pipes and pumps. To do this, the ball valves in the pump chamber are manually lifted on the draw and pressure sides. The backwash system/ball valve raising can automatically be activated when the pump is switched off if an optionally available 4/2-way valve is used.

The backwash system/ball valve raising is available in the following models:
BF 1 – Backwash system with manual valve, EPDM seals for pump housings made from plastic and metal
BF 2 – Backwash system with manual valve, PTFE seals for pump housings made from plastic and metal
BF 3 – Backwash system with manual valve, FPM seals for pump housings made from plastic and metal
BF 4 – Backwash system with pneumatic valve, EPDM seals for pump housings made from plastic
BF 5 – Backwash system with pneumatic valve, PTFE seals for pump housings made from plastic