Quarter turn actuator
DFPD-HD-...-...S...
Festo AG & Co. KG
Postfach
73726 Esslingen
Deutschland
+49 711 347-0
www.festo.com
Operating instructions
8066109
1612
[8066111]
Original: de
Quarter turn actuator DFPD-HD-...-...S...
English
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1
About this document
This document describes the use of the above-mentioned product. Certain aspects
of use connected to a hydraulic unit or handwheel control are described in other
documents and must be observed
è
Chap. 1.1.
All available documents for the product
è
www.festo.com/pk.
1.1 Applicable documents
Document
Table of contents
DFPD-HD-...-HW operating instructions
Mounting, commissioning and operation of the
hydraulic unit
DFPD-HD-...-MW operating instructions
Mounting, commissioning and operation of the
handwheel control
Fig. 1
2
Safety
Take into consideration the legal regulations for the respective destination.
Observe product labelling.
Before carrying out mounting, dismantling, installation and maintenance work,
switch off the compressed air supply and vent the drive. Secure compressed air
supply against accidental restarting.
Return to Festo
Hazardous substances can endanger the health and safety of personnel and cause
damage to the environment. To prevent hazards, the product should only be
returned upon explicit request by Festo.
Consult your regional Festo contact.
Complete the declaration of contamination and attach it to the outside of the
packaging.
Comply with all legal requirements for handling hazardous substances and
transporting dangerous goods.
3
Use for intended purpose
The DFPD-HD quarter turn actuator is intended to activate process valves, such as
ball valves and butterfly shut-off valves with a rotation angle from 0° (valve closed)
to 90°. The quarter turn actuator is suitable for controlling media-flow process
valves in fluid engineering systems.
The product may only be used in its original status without unauthorized
modifications.
Only use the product if it is in perfect technical condition.
Observe the specifications on the product labelling.
Note
The operating torque of the drive must not be higher than the maximum
permissible torque listed in ISO 5211, with reference to the size of the mounting
flange and of the coupling.
Operating medium
Only use compressed air in accordance with the specifications
è
Technicaldata.
Only use unlubricated compressed air under normal conditions. Once the
product has been used with lubricated compressed air, it must continue to be
operated with compressed air only.
4
Further information
– Accessories
è
www.festo.com/catalogue
– Documents and literature
è
www.festo.com/sp
5
Service
Contact the regional Festo contact if you have technical questions
è
www.festo.com.
6
Product overview
The product label can be found on the gear unit.
6.1 Function
The DFPD-HD-...-...S... is a single-acting quarter turn actuator.
The piston is moved by pressurising the pneumatic cylinder.
In the case of type DFPD-HD-...-RS, the quarter turn actuator is put in the “Valve
open” position, while type DFPD-HD-...-LS is put in the “Valve closed” position.
The linear motion of the piston is transformed using
aScotch yoke system into a swivel motion of the
transmission shaft. The return of the process valve is
implemented by spring force.
The connected process valve records the moment of reaction of the quarter turn
actuator.
Fig. 2 shows the mode of operation on the example of the DFPD-HD-...-RS:
Fig. 2
6.2 Layout
1
2
3
4
5
6
7
8
9
aJ aA 8
aB
aC
1
8 mounting threads
according to ISO 5211
2
Parallel key groove
3
Pneumatic cylinder
4
4 mounting threads – e.g.,
forsensor box
5
Transmission shaft (internal) –
delivery “Valve closed”
6
Spring package
7
Adjusting screw for
end-positionadjustment
8
Transport lug
9
Gear units
aJ
Mechanical position indication
aA
Supply port (4)
aB
Supply port (2)
aC
Adjustable stop for
end-positionadjustment
Fig. 3
