Festo DNCV Série Notice D'utilisation page 28

DNCV-...
Warning
The piston rod of the DNCV-... moves fast even with a highly restricted setting
(see table below).
S Make sure that the sequence of movement is such that, even after stationary
periods, the following specifications are observed:
– The piston of the DNCV-... always moves against a pressurized chamber.
– Pressure forces in the direction of outward movement due to piston areas
of different sizes are taken into account..
Type
Situation in
valve mid-
position
Reaction
Remedy
Please note
If impact forces are too high, they will damage the DNCV-... .
S Make sure that the operating conditions lie within the permitted range
(see chapter "Technical specifications").
Tighten the adjusting screws 3 and 4
S
for the piston speed:
– at first completely in the clockwise
direction,
– then loosen approximately one turn.
28
DNCV-...-5/3E-...
Both cylinder chambers are ex-
hausted.
When the valve is switched from
the mid-position the piston moves
against an unpressurized chamber.
In valve mid-position the piston rod
can move freely.
Always presurize the mechanical
position first:
– With retracted piston rod
actuate valve coil 12 first.
– With extended piston rod
actuate valve coil 14 first.
DNCV-...-5/3B-...
Both cylinder chambers are
pressurized.
When the valve is switched
into the mid-position a force
arises due to the different
piston areas. In the retracted piston areas. In the retracted
end position the piston rod
moves out quickly inspite of
a highly restriced setting.
Always actuate the valve mid-
position in the case of the ex-
tended piston rod.
S2 S1 Diag 1214
Fig. 14
Festo DNCV-... 0207a English