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License Number 6D-1724
SCOTCH & YOKE PNEUMATIC ACTUATORVT-DFA SERIES
License Number 6D-1724
Oil and Gas Chemicals Paper and PulpWater and Sewage,
, headquartered in Toronto, Canada is a unique company within the
Flow Control Industry.
supplier of choice is our prime mission.
‘
VAHN-TECH International Inc. reserves the right to change the technical data without prior notice.
1SCOTCH & YOKE PNEUMATIC ACTUATOR VT-DFA SERIES
FeaturesVT-DFA series Scotch and Yoke Pneumatic Actuators are heavy-duty actuators for operating large diameter ball valves,
butterfly valves, plug valves and other 90˚ rotating mechanisms.
The piston rod and guide block connection, superior surface finish and the self-lubricating bearings maximize the input
energy transfer directly to the valve stem and ensure reliable operation over the service life of the actuator. Efficiency
is further enhanced by the tension-loaded spring, minimizing radial loads on the piston road.
VT-DFA series actuators incorporate three stages of internal and external coatings to resist severe weather, chemical
and petroleum environment. The inner surface of cylinder is coated by PTFE, that provides enhanced corrosion
resistance and is self-lubricating.
VT-DFA series actuators can be supplied with the complete line of controls and monitoring accessories, including hand
wheel, hydraulic manual override, limit switches, solenoid valves, positioners and other control accessories.
The modular design of the Scotch & Yoke makes it suitable for all type of application. It is extremely convenient and
easy to handle during storage, installation and maintenance operation. Modules are removable, serviceable and
interchangeable when mounted on the valve.
To ensure the safety of personnel during installation and maintenance, the spring module has been designed so that it
only be removed from the power module with the spring in the fully extended position. This prevents accidental
release of the spring force, protecting personnel from injury and the actuator from accidental damage.
Specifications:
* For additional options and higher torque, please contact us.
The valve mounting interface meets ISO 5211 standard dimensional requirements and all connecting interfaces
conform to NAMUR requirements.
VT-DFA Series possesses two independent travel adjustment bolts, allowing for ± 10˚ adjustment of the valve opening
position.
VT-DFA Series actuators comply with IP65 protection class.
Torque Range:
Working Temperature:
Standard Temperature:
Low Temperature:
High Temperature:
-20˚C~+80˚C
-40˚C~+80˚C
-20˚C~+150˚C
Double Acting Actuator:
Spring Return Actuator:
Min 977N.m / Max 24,000 N.m
Min 854N.m / Max 29,000 N.m
VAHN-TECH International Inc. reserves the right to change the technical data without prior notice.
2SCOTCH & YOKE PNEUMATIC ACTUATOR VT-DFA SERIES
Design & Construction
Pre-compressed spring unitSpecially designed spring module with adjustable output torque and replaceable spring to fit different type of valve torque. Pre-compressed spring unit is easy to exchange and ensure safe operation.
Reduced WearThe piston rod connects with the guide block to compensate for side load deflection, reducing wear on rod, bearings and seals. Advanced surface treatment is used on piston rod and guide block to provide superior wear resistance and extends the service life.
Standardized MountingThe NAMUR mounting configuration allows standardization of mounting hardware for a wide range of shaft driven accessories.
Replaceable BearingsReplaceable Bearings protect sliding and rotating components with suitability for either dry or lubricated working conditions.
Hydraulic Overrides for Spring ModuleOptional Hydraulic Override for Spring Return actuator is internal to the cylinder module and does not increase the actuator length.
Easy LiftingActuators are equipped with lifting eyes for safe handing during shipping, installation and maintenance.
PTFE Guide RingPTFE Guide Ring prevents metal to metal contact with the cylinder bore, ensuring the cylinder is not damaged by the piston while helping reducing friction.
RollerRollers are used to reduce the friction between the yoke arm and pin, minimizing the wear of yoke arm and pin.
Travel AdjustmentBi-Directional Travel Stops allow for 80˚ to 100˚ total travel adjustment.
1.
2.
3.
4.
5.
6.
7.
8.
9.
1 5243
7 9 8
VAHN-TECH International Inc. reserves the right to change the technical data without prior notice.
3SCOTCH & YOKE PNEUMATIC ACTUATOR VT-DFA SERIES
Modular Design
Pneumatic Power Module
Pneumatic Power Module
Hydraulic Power Module or Override for Hydraulic
Actuators Module
Hydraulic Power
Module or Override for Hydraulic Actuators
Module
Pneumatic Power Module with Extended Travel Stops
Blind End Cap
Spring Module
Spring Module with Specially Designed Adjustable Output
Torque and Integral Override Gear Operator
Hydraulic power Module or Override for Hydraulic
Actuators Module
Spring Module with Specially Designed
Adjustable Output Torque
Spring Module with Specially Designed Adjustable Output
Torque and Integral Hydraulic Override
Cylinder
VAHN-TECH International Inc. reserves the right to change the technical data without prior notice.
4SCOTCH & YOKE PNEUMATIC ACTUATOR VT-DFA SERIES
Torque Characteristics
Torque Characteristics of Three Different Types of 90° Travel Valves
Single Acting
Spring BreakSpring Break
Spring StrokeAir Stroke
Spring End
Stroke
To
rq
ue
45˚0˚
25
50
75
100
125
90˚
Ball Valve Torque Butterfly Valve Torque
Plug Valve Torque
100%
Torque
close
Valve Rotationopen
25%-30%15%-20%
70%-80%
Air End
Air Break
Double Acting
Break Torque
Stroke
To
rq
ue
45˚0˚
25
50
75
100
125
90˚
Running Torque
100%
Torque
close
Valve Rotationopen
80%-90%
100%
Torque
close
Valve Rotationopen
VAHN-TECH International Inc. reserves the right to change the technical data without prior notice.
5SCOTCH & YOKE PNEUMATIC ACTUATOR VT-DFA SERIES
Assembly Drawing
No. Description
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
Cylinder End Cap
Stud
Piston Rod
Cylinder End Cap
Up Cover
Cover
Indicator Cap
Small Cover
Indicator Board
O-Ring
Bearing
O-Ring
Roller
Pin
Torque Indicator Pin
Worm
Energy Saving Unit
Supporting Seat
Tension Rod
Material
QT500-7
C45
Alloy Steel
QT500-7
HT200
QT500-7
C45
HT200
AI
NBR
H62
NBR
GCr15
GCr15
45
45
/
45
45
No. Description
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
Spring Module
Hydraulic Module
Lead Screw
Spring Seat
End Cap
End Cap
Guide Block
O-Ring
Yoke
Body
Adjust Bolt
Circlip
Bearing
O-Ring
Piston
O-Ring
Guide Ring
Cylinder
O-Ring
Material
/
/
C45
C45
Carbon Steel
C45
QT500-7
NBR
Carbon Steel
Carbon Steel
C45+Ni
65Mn
H62
NBR
Carbon Steel
NBR
PTFE
C20
NBR
VAHN-TECH International Inc. reserves the right to change the technical data without prior notice.
6SCOTCH & YOKE PNEUMATIC ACTUATOR VT-DFA SERIES
Torque Sheet (N.m)
Double Acting
Spring Return Acting Torques (N.m) - Air Supply Pressure 4 bar
Air End (ETO) Spring Break (BTC) Spring End (ETC) Model Max Torque of Drive Module
VT-DFA16-250
VT-DFA16-300
VT-DFA16-350
VT-DFA25-350
VT-DFA25-400
VT-DFA25-450
VT-DFA30-450
VT-DFA30-500
VT-DFA30-550
VT-DFA35-550
VT-DFA35-600
VT-DFA35-700
4000
8000
16000
32000
Air Start (BTO)
1347
1915
2583
3260
4201
5261
6448
7892
9483
12085
14299
19283
898
1277
1722
2173
2801
3508
4298
5262
6322
8057
9533
12856
1281
1822
2457
3101
3996
5005
6133
7507
9021
11496
13601
18343
854
1214
1638
2067
2664
3336
4089
5005
6014
7664
9068
12228
Run Break Run Model
Max Torque of DriveModule
VT-DFA16-250
VT-DFA16-300
VT-DFA16-350
VT-DFA25-350
VT-DFA25-400
VT-DFA25-450
VT-DFA30-450
VT-DFA30-500
VT-DFA30-550
VT-DFA35-550
VT-DFA35-600
VT-DFA35-700
4000
8000
16000
32000
Break
1642
2335
3150
3976
5123
6415
7863
9624
11565
15002
17749
23936
977
1388
1873
2349
3027
3791
4651
5694
6842
8904
10535
14206
2190
3114
4200
5301
6831
8555
10484
12833
15420
19651
23250
31355
1302
1852
2497
3133
4037
5055
6203
7593
9123
11752
13906
18753
Run Break Run Break
2738
3893
-
6627
8539
-
13104
16041
-
25002
29581
-
1628
2315
-
3917
5047
-
7753
9491
-
14839
17557
-
3286
-
-
7953
-
-
15726
-
-
29477
34875
-
1945
-
-
4700
-
-
9304
-
-
17630
20859
-
Break Run
3834
-
-
-
-
-
-
-
-
35004
-
-
2279
-
-
-
-
-
-
-
-
20775
-
-
Air Pressure
3 Bar 4 Bar 5 Bar 6 Bar 7 Bar
VAHN-TECH International Inc. reserves the right to change the technical data without prior notice.
7SCOTCH & YOKE PNEUMATIC ACTUATOR VT-DFA SERIES
Torque Sheet (N.m)
Spring Return Acting Torques (N.m) - Air Supply Pressure 5 bar
Spring Return Acting Torques (N.m) - Air Supply Pressure 6 bar
Air End (ETO) Spring Break (BTC) Spring End (ETC) Model Max Torque of Drive Module
VT-DFA16-250
VT-DFA16-300
VT-DFA16-350
VT-DFA25-350
VT-DFA25-400
VT-DFA25-450
VT-DFA30-450
VT-DFA30-500
VT-DFA30-550
VT-DFA35-550
VT-DFA35-600
VT-DFA35-700
4000
8000
16000
32000
Air Start (BTO)
1684
2394
3229
4076
5251
6576
8059
9865
11854
15376
18192
24535
1123
1596
2153
2717
3501
4384
5373
6577
7903
10251
12128
16357
1602
2277
3071
3877
4995
6255
7666
9384
11276
14626
17305
23338
1068
1518
2048
2585
3330
4170
5111
6256
7517
9751
11537
15559
Model Max Torque of Drive Module
VT-DFA16-250
VT-DFA16-300
VT-DFA16-350
VT-DFA25-350
VT-DFA25-400
VT-DFA25-450
VT-DFA30-450
VT-DFA30-500
VT-DFA30-550
VT-DFA35-550
VT-DFA35-600
VT-DFA35-700
4000
8000
16000
32000
2021
2873
3875
4891
6302
7892
9671
11839
14225
18128
21448
28925
1347
1916
2583
3261
4201
5261
6448
7893
9483
12086
14229
19284
1922
2733
3686
4653
5994
7507
9200
11261
13531
17244
20402
27514
1282
1822
2457
3102
3996
5004
6133
7508
9021
11496
13601
18343
Air End (ETO) Spring Break (BTC) Spring End (ETC)Air Start (BTO)
Air Pressure
BTO = Break To Open Torque (Air Start)ETO = End to Open Torque (Air End) BTC = Break To Close Torque (Spring Start)ETC = End To Close Torque (Spring End)
VAHN-TECH International Inc. reserves the right to change the technical data without prior notice.
8SCOTCH & YOKE PNEUMATIC ACTUATOR VT-DFA SERIES
Dimension (mm)
Spring Return VT-DFA16/VT-DFA25 Spring Return VT-DFA30/VT-DFA35
Double Acting
Detail I Detail II Detail III
D E E1Model
VT-DFA16-250
VT-DFA16-300
VT-DFA16-350
VT-DFA25-350
VT-DFA25-400
VT-DFA25-450
VT-DFA30-450
VT-DFA30-500
VT-DFA30-550
VT-DFA35-550
VT-DFA35-600
VT-DFA35-700
310
370
420
440
490
540
540
590
650
650
710
820
75
75
75
90
90
90
110
110
100
143
143
143
105
105
105
150
150
150
176
176
176
208
208
208
H L1 L2 E2
230
260
285
310
355
360
380
405
435
468
498
553
107
107
107
103
103
103
137
137
137
155
155
155
507
507
507
570
570
570
700
700
700
895
895
895
682
682
682
779
779
779
947
947
947
1205
1205
1205
L M
1634
1634
1634
1862
1862
1862
1923
1923
1923
2543
2543
2543
M6
M6
M6
M6
M6
M6
M8
M8
M8
M8
M8
M8
D2 n M1 D1
80
80
80
100
100
100
120
120
120
160
160
160
165
165
165
254
254
254
298
298
298
356
356
356
4
4
4
8
8
8
8
8
8
8
8
8
M20
M20
M20
M16
M16
M16
M20
M20
M20
M30
M30
M30
B T
22
22
22
28
28
28
32
32
32
40
40
40
85.4
85.4
85.4
106.4
106.4
106.4
127.4
127.4
127.4
169.4
169.4
169.4
Air Connection
RC 1/2
RC 1/2
RC 1/2
RC 1/2
RC 3/4
RC 3/4
RC 3/4
RC 3/4
RC 3/4
RC 3/4
RC 1
RC 1
VAHN-TECH International Inc. reserves the right to change the technical data without prior notice.
9SCOTCH & YOKE PNEUMATIC ACTUATOR VT-DFA SERIES
SPRING MODULEWORKING PRESSURE
4/5 Bar
5/6 Bar
CYLINDER SIZE
250 ~ 700
ACTUATOR SHELL SIZE
16 - 35
ACTUATOR TYPE
DA Double Action
S Spring Return
ACCESSORIES
HW Jack Screw Manual Override
EX Extend Travel Stop
HY Hydraulic Manual Override
FAILSAFE POSITION
FC Failure Close
FO Failure Open
WORKING TEMPERATURE
L -20˚C~+80˚C
L1 -40˚C~+80˚C
L2 -20˚C~+150˚C
VT-DFAXX - XXX - S - 4/5 - L - HY - FC
A C T U A T O R S E L E C T I O N
VA H N - T E C H I n t e r n a t i o n a l I n c .2608-88, Bluejays Way, Toronto, Ontario, M5V 0L7, Canada
Tel.: +1 416 342 0001 E-mail: info@vahn-tech.com
www.vahn-tech.com19
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