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Loaders & Compactors - Do they match the bin handling process?::
"Flow diverter" to tap off oil to accessories like lifters.
If the lifter requires a very low flow (say about 10 litres/min) it is normally acceptable to "steal" some oil from the compactor hydraulics. The pump for the compactor hydraulics delivers around 80 - 90 litres/min, therefore the compactor will slow down by only 10 - 13% if 10 litre/min is diverted to the lifter.
(The only other option is to fit a second dedicated pump for the lifters. A seperate pump is the preferred technical solution, but not the lowest cost option)
A rather specialised FLOW DIVERTER valve is required. This valve is placed before the compactor valves and gives a priority regulated flow of 10 litres a minute to the lifters. The excess bypassed oil is available to drive the compactor, even at high pressure. (The more common flow regulators cannot tolerate high pressure on the bypass port). A typical example of the correct flow diverter valve is the:
Priority Flow Regulator, pressure-compensated (adjustable)
Manufactured by: Sauer-Danfoss
Part number: 2F96 P 6W-6W-6W-95
but other companies also produce similar valves. Remember to select the valve for the highest flow in the system (the full output of the pump).
In our experience, there must be no further flow regulators or flow divider valves after the diverter valve, because this creates too much back-pressure resulting in excessive oil temperatures. The only types of valves normally acceptable after a flow diverter are directional control valves and pressure relief valves.
Flow diverter valves are also very susceptible to dirt in the oil. Fit the valve in such a position that it is easy to remove the spool for cleaning.
The speed of the lifter is adjusted by turning the screw on the diverter valve. Please make sure that this adjustment is made with the oil at the normal operating temperature. And then make sure that the setting is tamper-proof.
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