Bentone B45-2 RME, Инструкция по установке и обслуживанию

Страница: 28 / 40

28 Bentone B45-2 RME
For installers
Pump working method
When the pump is started oil is drawn through the
suction port ”S” via ilter ”H” to the suction side of the
gearwheel set ”C”. From here the gear-wheel set pumps
the oil to the pressure side and at the same time the oil
becomes pressurized. The oil is led to cut-off and
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 low back to the suction side via return line
”G” with return port ”R” closed.
If the pump is overloaded, i.e. more oil is demanded
than the gearwheel is able to pump under the given
conditions, the oil pressure falls below the set value
because the piston of the regulating 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
1. Nozzle Stage 1
2. Nozzle Stage 2
4. Solenoid valve Stage 1 (Y1)
5. Solenoid valve Stage 2 (Y2)
7. Safety valve for nozzle (Y1S)
9. Oil pump
Oil under
suction
By-passed oil
returned to
tank or to
suction
Oil under
pressure
(V)
(P)
(O)
(C)
(G)
(A)
(R)
(S)
(F)
1
6.2.5 Function Suntec DV67C