INSTALLATION
NA Series Operating & Instruction Manual
Page 12
ATTENTION !
Valves on the suction side should be mounted with stems horizontal, or vertically downwards. All joints
in the suction line must be tight, to prevent air from entering into the system, with the risk of vapour
locking.
If the pump is installed with a negative static inlet head (lower diagram), the foot valve/ strainer must
always be immersed at a sufficient depth to avoid entry of air into the pump. Take suitable precautions
to prevent vortexing in the supply vessel. A pressure gauge should be installed in the suction line, as
close as possible to the pump.
If the supply vessel is under vacuum, a pressure balancing line should connect the supply vessel and the
pump inlet port.
The discharge line should be as short and direct as possible to minimize friction losses. An air vent (if
permissible) should be installed at the first high point in the discharge line.
