Semi-rotary drive
DAPS..R..-F..
Festo AG & Co. KG
Postfach
D-73726 Esslingen
+49 711 347-0
www.festo.com
(en) Operating instructions
8023613
1211f
[8023611]
Original: de
Semi-rotary drive DAPS..R..-F..
English
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1
Control sections and connections
9
1 2
3
4
5
6
7
8
aJ
aA
1
Transmission shaft (shaft groove
shows the process valve position –
here closed)
2
Compressed air supply port 2 (A)
3
Four mounting threads – such as
for mounting the limit switch or
sensor box
4
Compressed air supply port 4 (B)
5
Mounting thread for threaded pin
for aligning the NAMUR valve
6
View from below – flange to
ISO 5211
7
Star-shaped coupling for seating
of the square of a process valve
8
Mounting thread
9
Some product designs:
leakage groove
aJ
Mounting thread for pneumatic
NAMUR switching valve
aA
Only for product variants with the
ability to adjust the end position:
lock nut for securing the set end
position.
Fig. 1
Operating elements and connections – example of standard design,
double-acting
2
Design
Semi-rotary drives of the DAPS series are compact in design and have simple and
robust mechanics with little wear and tear. The design of the product is dependent
on the product design and may differ from the representation shown in Fig. 1
(
Fig. 1).
Through the housing, a shaft is guided outward on both sides. Through this, the
reaction torque is transmitted to a process valve (
Fig. 1,
6
) and, if applicable,
a limit switch or sensor box (
Fig. 1,
1
).
The flange to the process valve is normally designed in accordance with ISO 5211
(
section 12). Four mounting threads on the top are used for mechanical attach-
ment of a limit switch or sensor box (
Fig. 1,
3
). The housing side has a hole
pattern for valve attachment in accordance with VDI/VDE 3845 (NAMUR).
The housing of some semi-rotary drives has, on the process valve port side, a leak-
age groove (
Fig. 1,
9
) through which the leakage of an untight process valve
can escape.
The product is available in various designs. Depending on the version, the DAPS is
designed as a single-acting or double-acting semi-rotary drive. The single-acting
design with spring return is available with different spring strengths for various
supply pressures.
These operating instructions describe the following product variants:
Features
Type codes
Description
Series
DAPS-
Semi-rotary drive
Size or nominal torque in
Nm
0008-
…
8000-
Nominal torque 8 Nm
…
Nominal torque 8000 Nm
Swivel angle in degrees
090-
90°
Closing direction
R
Closes to right
Mode of operation
- (without)
S
Double-acting
Single-acting
Spring strength (with
mode of operation S)
(without)
1-
2-
3-
4-
(Omitted for double-acting)
Spring strength for connection pressure 2.8 bar
Spring strength for connection pressure 3.5 bar
Spring strength for connection pressure 4.2 bar
Spring strength for connection pressure 5.6 bar
1st flange hole pattern
F03
…
F25
Flange hole pattern F03
…
Flange hole pattern F25
2nd flange hole pattern
(without)
05
…
16
No second flange hole pattern
Flange hole pattern F05
…
Flange hole pattern F16
Design
(without)
-T6
-CR
Standard design (-20 °C to + 80 °C)
Low temperature (-50 °C to +60 °C)
Stainless steel (-20 °C to + 80 °C)
Fig. 2
Type code (e.g. DAPS-0120-090-R-F0507-CR)
Select suitable accessories (e.g. adapter kits) from the catalogue
(www.festo.com/catalogue).
3
Function
The piston movement of the DAPS is converted to a rotary movement by means of
yoke kinematics (Scotch yoke). These kinematics are only effective within an angle
of approx. 90°.
For double-acting semi-rotary drives:
Pressurising and venting of the cylinder chambers
cause the piston in the DAPS to move back and forth.
The
linear motion of the piston is transformed into a swiv-
el motion of the transmission shaft.
Fig. 3
For single-acting semi-rotary drives:
Return is through spring force.
Product designs with different spring strengths are
available (
Fig. 2).
Fig. 4
The screwed-on processing valve absorbs the reaction torque of the semi-rotary
drive. The torques permitted in accordance with the technical data
(
catalogue www.festo.com/catalogue) apply here.
4
Application
The DAPS semi-rotary drive is intended to activate right-closing process valves,
such as ball valves and butterfly valves with a rotation angle from 0° (valve closed)
to 90° (valve open).
It is completely tailored to the requirements of the processing industry and is suit-
able for control of media-flow process valves in fluid engineering systems.
5
Transport and storage
Ensure the following storage conditions: short storage times in cool, dry, shaded
and corrosion-resistant locations.
Warning
Danger of crushing! Danger of shearing!
The DAPS weighs up to about 183 kg, depending on the product version.
Body parts can be crushed or cut off if the product falls.
• For product versions weighing more than 12 kg, always use appropriate load-
carrying equipment in order to handle the product safely during transport and
assembly.
6
Requirements for product use
Note
Incorrect handling can result in malfunctions.
• Make sure that all the instructions in this section are always observed. The
product will then function correctly and safely.
• Compare the limit values specified in these operating instructions with your
actual application (e.g. pressures, forces, torques, masses, speeds, temperat-
ures). The product can be operated in compliance with the relevant safety
guidelines only if the load limits are observed.
• Ensure that all applicable regulations for your location are adhered to, e.g. of
the trade association or national institutions.
