Festo DSBC-40-30-PPVA-N3 Notice D'utilisation page 16

Pneumatic linear cylinder
Pneumatic installation
Definition
Moveable mass =
Use one−way flow control valves for setting the speed of the piston.
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With single−acting cylinders
Type GRLZ (supply air flow control)
Fig. 7
The GRL..−... are screwed directly into the compressed air ports. Other acces
sory parts with excessive screw−in length will damage the cushioning piston.
Check to see if closed−loop controlled non−return valves type HGL−... are
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necessary.
You will then prevent the moveable mass sliding down if there is a drop in
pressure when the product is fitted in a vertical or sloping position.
If an external guide is used:
Avoid a mechanical overdetermination of the piston rod by one of the following
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measures:
absolutely exact alignment (general)
the use of a self−aligning rod coupling type FK−...
the use of a guide unit
A rigid coupling will impair the service life and the function of the cylinder.
5 Commissioning
Complete system
Slowly pressurize the complete system.
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This will prevent uncontrolled movements from occurring.
For slow start−up pressurization use safety start−up valve type HEL−... .
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work load + piston (rod) mass
With double−acting cylinders
Type GRLA (exhaust flow control)
type FEN−... with compensating
coupling
Festo 0506a English