Bentone RSA 60 Installation And Maintenance Instruction page 29

When the pump is started oil is drawn through the
suction port "S" via filter "H" to the suction side ofthe
gearwheel set "C". From here the gearwheel set pumps
the oil to the pressure side and at the same time the
oil becomes pressurized. The oil is led tocut-offand
regulating valve "V" which opens when the set pressure
is reached.
The pressure is controlled and kept constant by
regulating valve "V". At the same time the gearwheel set
"C" distributes the oil through nozzle port "P" and pump
return side "R" via the shaft seal "F".
The quantity of oil supplied to nozzle port "P" is
determined by the pressure set on regulating valve "V"
and the nozzle/resistance in the nozzle line.
In 2-pipe-systems excess oil is led back to the oil tank. In
1-pipe-systems the by-pass plug "A" must be removed
to give free flow back to the suction side via return line
"G" with return port "R" closed.
When the pump is stopped, the pump output drops and
produces a drop in the oil pressure. The spring in the
regulating valve presses the regulating pisten forward
until it seals in port "P". This cuts off the oil flow to the
nozzle and ensures that the nozzle line is eftectively shut
off.
Exchange of filter
lf the pump is overloaded, i.e. more oil is demanded than
One pipe system
the gearwheel is ableto pump underthegiven conditions,
the oil pressure falls below the set value because the
piston of the reg ulating valve moves towards its closed
position and partially or wholly cuts off the return oil via
port „O".
This can be remedied by
- reducing the pump pressure
- reducing the capacity, i.e. smaller nozzle or greater
resistance
- changing to a pump with higher capacity
5.7.6 Mounting/dismounting by pass
plug
In a 2-pipe-system excess oil is led back direct to the
oil tank. In a 1-pipe system the by-pass plug must be
removed so that there isa free passage back to the
suction side through the return line with the return port
closed.
Two pipe system
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Bentone