Datasheet Content
REGULATOR 24-VK 24-T201-UG-E
MANUAL 11-06-09
Documentation
The following information sheets illustrate the description below:
24-T201-4G-E Sectional view of the regulator 24-VK1 with main dimensions
24-T201-D0-E Graph of relative output at constant pressure drop
24-T201-DB-E Graph of output at 90° opened
24-T301-4G-E Sectional view of the regulator 24-VK2 with main dimensions
General
The regulator 24-VK is designed for use in or on oil burners equipped either with return flow atomisers or
with compressed air atomisers or steam atomisers.
Turning the regulator shaft changes the aperture inside the regulator, consequently changing the fuel flow
rate. Both flanges at the regulator shaft are marked with a "+", a scale in 15° steps and a "-". The pointer
mounted on one side of the regulator shaft shows the actual position of this shaft.
The regulator is suitable for pressures up to 40 bar and fuel temperatures up to 140°C.
Mounting
The connection block has two 6,5 mm holes and four threaded M5 bores for mounting purposes. These
provisions also allow mounting a control motor or an optional heating plate.
To prevent malfunction, be careful when removing the plastic plugs from the connection ports and make
sure no material stays behind.
In case of air atomisation or steam atomisation, the regulator is to be connected in the supply line between
the pump and the atomiser. With a return flow atomiser, the regulator is to be connected in the return line
from the atomiser.
Connections
The connections on the block of the regulator are marked as follows:
I Fuel inlet to the regulator.
O Fuel outlet from the regulator.
When choosing fittings, make sure that the channels inside the connection block remain fully open. Even a
partial blockage at one of the channels inside will inevitably lead to malfunctioning of the regulator.
Never use any additional sealant on the thread. The remains getting inside the regulator could lead to
failures. There are no objections against the use of flat gasket rings to seal the fittings.
© Fluidics Instruments BV Page 1/2
REGULATOR 24-VK 24-T201-UG-E
MANUAL 11-06-09
Function
Turning the regulator shaft changes the flow through the regulator. The marking of "+" and "-" always
refers to the throughput of the regulator and not to the output of the actual atomiser. The throughput of the
regulator is at minimum with the pointer at "-". Turning the regulator shaft towards "+" increases the
throughput of the regulator. Therefore, in case of air or steam atomisation, the output of an atomiser is at
maximum if the pointer is at "+". On the other hand, for a return flow atomiser, the output of the atomiser
will be at minimum if the pointer is at "+".
The flanges have a scale with 15° division. This scale allows reproducible adjustment of the regulator
during operation.
The throughput of the regulator always is related to a certain pressure difference between the inlet and the
outlet of the regulator. The pressure drop across the regulator and the maximum throughput depend on the
actual atomiser and system particulars. In order to benefit from the maximum angle of travel, the choice of
the size for the regulator should be made in such a way that its maximum throughput fits the actual
atomiser and method of atomisation. Here also system particulars should be taken into account.
If firing heavy fuel, we advise mounting a heating device to preheat the regulator for those applications
where the fuel flow often stops during longer intervals. It is sufficient to apply an electrical heating plate
to preheat the regulator connection block. Two 6,5 mm bores in the connection block allow mounting
such a heating plate. This heater could work permanently, but it should at least be switched on in time
before fuel is supposed to start flowing to achieve correct operation.
Maintenance
The regulator normally does not require any maintenance. Wear or damage highly depends on fuel
quality. The only moving part is the regulator shaft. After a long period of operation, wear on the sleeve or
on the regulator shaft can occur, resulting in an increase of leak flow at minimum throughput. After a
while some wear may occur on the o-rings. Complete seal sets are available for replacement.
In case of wear of the sleeve or of the regulator shaft, it is advised to return the regulator to the factory for
repair. It is not recommended to perform this kind of repairs without proper tools and test equipment. The
regulator shaft and the sleeve are being manufactured within close tolerances to avoid operation
difficulties after such repairs.
To exchange the o-rings in the flange, remove the pointer, held by 1 screw. Remove any damages and
polish any sharp edges at both ends of the regulating shaft. Remove both flanges, each held by 2 screws,
but leave the regulating shaft in its place. Carefully remove both o-rings from their grooves using a sharp
needle without damaging the flanges in any way. Before re-assembly, make sure all parts involved are
undamaged and perfectly clean. In case the regulator shaft has come out by accident, put it back in the
correct position. Otherwise, the regulator will not function at all afterwards. Put the new o-rings in place.
Near the o-rings, the regulator shaft should be absolutely free of damages. Re-assemble the regulator in
reverse order.
The position of the pointer on the regulator shaft has been pre-set at the factory. Both ends of the regulator
shaft have a pit for fixing the pointer in the correct position. If the regulator shaft is mounted properly and
the pointer is fixed again using this pit, the characteristic of the regulator will not change after
replacement of o-rings.
© Fluidics Instruments BV Page 2/2
Regulator 24—VK1 24-T201-4G-E
28-09-10
M5x12/17_ (8x)
Pointer
O-ring 7,66x1,78
06.5 (2x)
O-ring 17,17x1,78
Connection block
Sleeve
Flange
Regulatorshaft
© Fluidics Instruments BV Page 1/1
