FUEL PUMP TYPE DANFOSS BFP….
Function
As the oil pump turns it draws oil from the suction line connection S, through the
filter H and into the suction side of the gear set C. Any suction generated before
the gear set can be measured with an appropriate vacuum gauge at
connection V.
The gear set then pumps the oil through and puts it under pressure. The pressure
is measured at connection P1. No oil will be released to the nozzle port E until the
normally closed solenoid valve NC is opened.
The pressure is controlled and kept constant by means of the diaphragm D
behind the pressure regulator P
1
. The pressure regulator P
1
distributes the oil
quantity supplied by the gear set between the nozzle port E and the return side of
the pump R.
The oil quantity supplied is determined by the setting of the pressure regulator P
1
and the size of the oil nozzle in the nozzle line E.
When the opening pressure has been reached, the passage to the return side of
P
1
opens. The diaphragm and the spring keep the pump pressure constant at the
set value.
When used in a one-pipe installation connection R is closed and A must be
removed to allow internal recirculation of the fuel. If A is not opened then
damage to the pump seals will occur.
If a two-pipe system is required then a return line must be fitted into
connection R and A must be fitted to divert the recirculating oil out through
the return line.
E90-803-001-001-00 - 02/06
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