24
Bentone
*
**
5.8.5 Function BFP 11 and BFP 21
When the pump is started oil is drawn from the suction connection (S)
through the filter (H) to the gear wheel pump’s suction side (C).
From there the oil is conveyed to the pressure side of the gear wheel pump,
where the oil is pressurized. The pressure is controlled and held constant at
a set value by the regulator valve (P
1
) via the membrane (D).
The regulator valve (P
1
) distributes the oil from the gear wheel pump (C) to
the nozzle connection (E) and the pump return side (R).
The amount of oil used is determined by the pressure set at the regulator
valve (P
1
) and by the size of the oil nozzle in the nozzle line.
The valve (P
1
) functions as follows:
• When the oil has reached opening pressure the passage to the
return side opens.
• The membrane and the spring keep the pressure constant at the
pre-set value.
• When the pump is overloaded, i.e. if more oil is demanded from the
gear wheel pump than it is able to deliver under prevailing
circumstances, the oil pressure drops below the set value, where-
upon the valve shuts the return side (R) to the membrane (D) and
reverts to the start position
This can be remedied by:
• Reducing the pump pressure.
• Reducing the amount of oil delivered, i.e. replacement with a smaller
nozzle.
• Replacement with a larger capacity pump.
Summary of Contents for Bentone ST50 ST 120 KA
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Page 36: ...Enertech AB P O Box 309 SE 341 26 Ljungby www bentone se www bentone com...
