Pumps With By-Pass; General Maintenance - Della Toffola S/P Instrucciones Originales

3.6 PUMPS WITH BY-PASS

The bypass valve connects the inlet and outlet pipe of the pump. When necessary
it is possible to open the valve
pump according to requirements. There is a ball valve in all pump types except
for the Midex pump where a spring bypass valve is used.
ATTENTION! - In order to have the self priming action at the
beginning of the working, the bypass valve must be completely
closed.
OPEN
CLOSED
By-pass Mini
Major and Maxi
4 MAINTENANCE

4.1 GENERAL MAINTENANCE

Each pump is adjusted and tested inside the factory during and after the
assembling of it. Very few maintainance interventions are required depending
on the wear and tear of the pump caused mainly by the pressure and by the kind of
fluid to be transferred. Leaks from the body of the pump suggest that the o-
rings and/or the mechanical seal are worn out and must be replaced. Important
losses of capacity (if not due to electric failure), can suggest problems with
the impeller and with the front cover of the pump. In these cases a simple check
is possible by dismounting the front cover. The replacement of the impeller and
the front cover will be necessary in case of severe deformation or breakages of
the impeller wings and when scoring/indentation on the cover are found.
ATTENTION! - Before doing any maintenance or repair,
disconnect the electrical supply.
ATTENTION! - Any maintenance or repair must be performed by
specialized and authorized staff and all spare parts must be
original. Do not try any emergency repairs which could
compromise the proper operation of the pump.
to decrease the capacity and the head of the
OPEN MAX
OPEN
CLOSED
CLOSED
26
By-pass
OPEN
Midex and Minor