Virutex SVN250 Manual De Instrucciones página 7

The SVN250/SVN250 DUO vacuum clamping system
is intended for use as a holding mechanism for parts
with at least one flat side. It has no moving parts and is
powered by compressed air. Suitable for wood, plastic,
glass, aluminium, etc.
2. SPECIFICATIONS
Holding force..................................................800 gr/cm
Vacuum surface area..............................................150 x 150 mm
Working pressure..........................................................5.5 - 7 bar
Air flow needed at 5.5 bars..........................................28 l/min
Dimensions.....................................................160 x 22 x 200 mm
Weight...............................................................................325 gr
Only SVN250 DUO
Air flow needed at 6 bars.....................................42 l/min
Dimensions.....................................................160x254x160 mm
Weight................................................................................500 gr
3. UNPACK AND CHECK
Inside the box you will find the following:
• Unit SVN250 with a rubber seal already assembled
or unit SVN250 DUO with a rubber seal, on both sides,
already assembled.
Transparent air supply tube
Set of three rubber gaskets
• The SNV250/SVN250 DUO unit is equipped with a quick
fit (1/4" BSP) connector. The open end of the supply line
should be pushed firmly into the connector, until it stops
(Fig. 1). To check correct installation pull gently on the
line. A properly installed airline cannot be pulled out.
• Care should be taken to prevent the black collar from
being depressed while the clamp is in use. This will cause
the air hose to release immediately. The air hose will flail
and may cause injury.
4. BOLTING DOWN
• The SVN250 and SVN250 DUO needs to be bolted to a
workbench or work column. For best results the bench or
column needs to be as rigid as possible. Excessive work
piece vibration could, in extreme cases, cause the clamp
to let go of the work. In the case of SVN250 DUO, the
unit itself may also lose adhesion.
For SVN250 only: The four bolting points will accept a
M6 or 1/4" screws (Fig. 2). The unit does tolerate quite
a bit of unevenness in a work piece, but needs a flat
support surface for best results.
For SVN250 DUO only: A flat and non-porous surface
is necessary to correctly attach the unit.
The SVN250 DUO has two vacuum generation units on
both sides, which work independently. To interrupt the
suction on the upper face, press on the air outlet C (Fig.
8), which is closest to the suction hole. To interrupt the
suction on the lower face, which secures the unit to
the workbench, press on the opposite outlet D (Fig. 9).
5. AIR SUPPLY
at 6 bar
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• The "quick fit" 1/4" bsp fitting, on the transparent air
supply line, is a very common thread form for valves.
Most on/off valves and "snap on" fittings will have this
thread form.
• We recommend that an on/off valve be used with
this unit, and that the valve be fixed firmly in place.
VIRUTEX can supply an appropriate valve if required.
(See accessories list).
• The air supply must be between 5.5 bar and 7 bar (600
to 700 kPa) for the SVN250 and between 6 and 8 bar
(600 to 800 kPa) for the SVN250 DUO. If it exceeds 8
bar (800 kPa), the units can be seriously damaged and
potentially dangerous.
• Less than 5.5 bar (600 kPa) will give reduced holding
power.
• Air supply needs to be clean. Oil or dust in the air supply
will block internal parts within the clamp and reduce
the holding force. Small amounts of water condensate
will not adversely affect the clamp.
• A small compressor can be used, because the SVN250
and SVN250 DUO unit uses only 28 and 42 litres of air
per minute at 5.5 bar and 6 bar. A lower air pressure will
also use less air. The compressed air should be coming
from a tank so the air is not pulsed.
6. RUBBER SEAL
• The seal installed into the unit has been performance
tested and is ready for use. If you need to re-install the
seal, please note the oval shape of the rubber. Do not
twist the seal prior to installing. Twisting will result in
a poor or nonexistent seal.
• Different shaped, and quite small, work pieces can be
held by moving the rubber seal to the required size i.e.
smaller than the work piece (Fig. 3). The three piece seal
kit should be able to accommodate almost all situations.
• If a seal needs to be cut it is good practice to make
the seal 3 mm (1/8") longer than required, as the rubber
will readily compress.
• If you need to cut a seal ensure that the ends to be
joined are cut square. There should be no frayed edge
to allow loss of vacuum. To achieve this type of cut use
a sharp chisel and cut in one pass preferably using a
mallet on the chisel.
It is best to put the ends together in the clamp before
pressing the remainder of the seal in. The join of the seal
should always be supported on both sides. (Fig. 4)
Always include the suction hole in any shape to be made.
Extra seal kits are available as accessory.
Cutting off the air supply will stop the vacuum
generation. Please keep this in mind when
using it vertically, as the unit will fall freely.
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