Suction And Delivery Circuits - Bertolini GIARDINAGGIO Serie Manual De Uso Y Mantenimiento

3.7

Suction and delivery circuits

The suction hose must be installed in such a way as to prevent air pockets from forming.
Make sure that the hose is routed over the shortest possible distance. The diameter of the
hose must be the same as that of the pipe fitting, hose must be fitted on down to the elbow
and fastened with good quality clamps.
Always allow for a safety margin in relation to the hose length, so as to prevent the clamps
from slipping off or loosening owing to vibrations from the system. It is advisable to
periodically check these connections, which could allow air to enter.
Air drawn in by the pump could cause faults and early failures of the diaphragms.
The hose must be able to bend without throttling the circuit. The ideal hose is the type with
a steel coil, which is flexible while being light and able to maintain its shape.
All the threaded connections must be assembled with PTFE, specific adhesive or
equivalent, so as to ensure a perfect seal.
If the route is direct, the dimensions of the pipes and pipe fittings must not be less than the
diameter of the pipe fittings supplied with the pump. If elbows and/or three-way valves or
similar must be installed, the circuit size must be increased in relation to their number.
The clear passage (meaning the minimum diameter of the ball hole and not of the
thread) of any three-way valves or equivalent, must not be less than the internal
diameter of the pump suction pipe fitting.
The manufacturer must take particular care when designing the delivery system so as to
avoid danger hazards to persons caused, not by the pump, but by the way the system in
which the pump is installed has been designed, constructed or improperly used.
To avoid excessive pressure in the manifold, make sure that the delivery hoses are
adequately sized. In any case, they must be no smaller than the diameter of the pipe fitting
supplied with the pump.
Only use components (hoses, pipe fittings, clamps, etc.) whose minimum characteristics
are equal to the maximum pressure of the pump.
66