Translation of the original instructions
© 2020 all rights reserved to Festo SE & Co. KG
1 Applicable documents
All available documents for the product èwww.festo.com/sp.
2 Safety
2.1 Safety Instructions
– Take into consideration the ambient conditions at the location of use.
– Only use the product in original status without unauthorised modifications.
– Observe labelling on the product.
– Store the product in a cool, dry, UV-protected and corrosion-protected envir-
onment. Ensure that storage times are kept to a minimum.
– Prior to mounting, installation and maintenance work: Switch off compressed
air supply and secure it from being switched back on.
– Observe tightening torques. Unless otherwise specified, the tolerance is
±20%.
2.2 Intended use
The product is intended for the transport of loads.
2.3 Training of skilled personnel
Installation, commissioning, maintenance and disassembly should only be con-
ducted by qualified personnel.
3 Further information
– Accessories èwww.festo.com/catalogue.
– Spare parts èwww.festo.com/spareparts.
4 Service
Contact your regional Festo contact person if you have technical questions
èwww.festo.com.
5 Product overview
5.1 Function
The piston rod moves outwards when the cylinder chamber is pressurised. The
advanced piston rod is retracted as follows:
– For single-acting cylinders, by means of the integrated return spring.
– For double-acting cylinders, by pressurising the other cylinder chamber.
The cylinder force during advance and return is:
– different with piston rod at one end.
– identical with through piston rod.
The position of the piston can be detected by proximity sensors.
5.2 Design
DSNU
1
Male thread on the piston rod for
mounting the payload
2
Male thread on the bearing cap for
mounting
3
Supply ports in the bearing/end
cap
4
Male thread on the end cap for
mounting
5
Cross hole for mounting
Fig. 1 Design of DSNU
DSNU-S
1
Male thread on the piston rod for
mounting the payload
2
Male thread on the bearing cap for
mounting
3
Supply ports in the bearing/end
cap
4
Male thread on the end cap for
mounting (size 20, 25 only)
Fig. 2 Design of DSNU-S
5.3 Installation
• Handle the cylinder so as to avoid any damage to the cylinder barrel and pis-
ton rod.
• Observe the following points:
– Parallel installation when using external guides
– Installation without distortion
– Compliance with the permissible loads èwww.festo.com/catalogue
• Observe tightening torque of lock nuts on the male thread2.
Size 8 10 12 16 20 25 32 40 50 63
DSNU
Tightening torque
on the bearing cap
[Nm] 10 10 20 20 40 40 60 80 100 100
Tightening torque
on the end cap
[Nm] 4.6 4.6 10.8 10.8 20.7 20.7 21.5 25.1 30.9 30.9
DSNU-S
Tightening torque
on the bearing cap
[Nm] 5 – 11 11 35 35 – – – –
Tightening torque
on the end cap
[Nm] – – – – 35 35 – – – –
Tab. 1 Tightening torque on the bearing/end cap
• Avoid mechanical alignment inaccuracies between the piston rod and an
external guide using one of the following measures:
– Absolutely precise alignment (general)
– Use of a self-aligning rod coupler FK
– Use of a guide unit FEN with compensating coupling
A rigid coupling impairs the service life and function of the cylinder.
5.4 Mounting Accessories
In the case of a large payload, high piston speed or when using quick exhaust
valves:
• Use suitable shock absorbers or external stops.
8118579
DSNU(-S)
Round cylinder
8118579
2020-03b
[8118581]
Instructions| Operating
Festo SE & Co. KG
Ruiter Straße 82
73734 Esslingen
Germany
+49 711 347-0
www.festo.com
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