W-Series Pneumatically Operated
Spring & Diaphragm Actuators
It all flows from expertise.
Contents
W-Series Pneumatically Operated
Spring & Diaphragm Actuator
01
Overview – Design features & performance benefits
02
Engineering data
02
Component list and materials of construction
03
Specifications
04
Standard dimensions & weights
05
W-Series Pneumatically Operated Spring & Diaphragm Actuators 01
The W-Series Pneumatically Operated
Spring & Diaphragm Actuator is designed
to satisfy the majority of general control
valve applications.
With proven reliability, even in the
most adverse climate conditions and
temperatures, the range comprises
three basic actuator sizes which, when
combined with different spring ranges,
provide a travel capability of up to
3½ (89mm). The spring air fail action
delivers crucial reliability for critical
applications and a pre-compressed
bench set is available across the range
of fitted springs.
W-SERIES
ACTUATOR
W-Series Pneumatically Operated
Spring & Diaphragm Actuator
with side mounted hand wheel
Engineering data
Design features
High power, fast response
Operates from low-pressure air supply
Low-stressed, positive spring fail action in either air fail open or close orientation
Field reversible to change fail safe position
Steel construction with minimal parts for low-cost, trouble-free operation and
maintenance. The assembly is bolted to a cast yoke combining lightness with
mechanical strength.
Performance benefits
Proven, reliable, low-cost performance
Fire-resistant construction, with positive fail position
Adjustable pre-compressed spring forces
High degree of reliability with low hysteresis
Epoxy paint system used as standard
Manufactured to ISO 9001 certification
02
W-Series Pneumatically Operated Spring & Diaphragm Actuators
Actuator sizes
Available in 75in2 , 150in2 and 300in2
Pneumatic supply pressure & connection sizes
1/4 in NPT Female. For other sizes please contact us.
Minimum pneumatic supply pressure 5psig (0.35bar)
above calculated actuator requirement. Maximum
pneumatic pressure for actuator sizes 75in2,
150in2 is 60psig (4.1bar). For 300in2 actuator the
maximum pneumatic pressure is 50psig (3.4bar).
Temperature limits
Minimum working temperature: -40 °C
Maximum working temperature: 90 °C
Minimum storage temperature: -55 °C
Design option
Upper and lower limit stops
Side mounted hand wheel
Geared side mounted hand wheel
Top mounted and geared manual operators
W-Series Pneumatically Operated Spring & Diaphragm Actuators 03
Component list and materials of construction
Key Component
Material of construction
Key
Component
Material of construction
No.
No.
1
Yoke
Cast steel / SG iron
17
Diaphragm button
Die cast aluminium
2
Spring tube assembly
Mild steel
18
Diaphragm*
Neoprene / Laminate nylon
3
Diaphragm case assembly Mild steel
19
Cover plate joint*
Rubber
4
Travel stop nuts
Mild steel
20
Seal box
13% Cr. stainless steel
5
Spring adjusting screw
Mild steel
21
Seal box O ring*
Neoprene
6
Actuator stem
Stainless steel
22
Diaphragm collar O ring*
Neoprene
7
Spring carrier
Mild steel
23
Travel indicator plate
Stainless steel
8
Spring thrust bearing
Steel
24
Travel indicator pointer
Stainless steel
9
Spring adjuster
Cast iron
25
Yoke screws
Steel
10
Cover plate
Aluminium
26
Stem coupling
Steel
11
Spring cover plate
Stainless steel
27
Stem coupling screw
Steel
12
Diaphragm collar
Mild steel
28
Stem coupling screw nut
Steel
13
Collar nut
Mild steel
29
Cover plate screws
Steel
14
Stem guide
13% Cr. stainless steel
30
Diaphragm case screws
Steel
15
Spring
Chrome vanadium steel
31
Diaphragm case screw nuts Steel
16
Travel stop tube
Mild steel
32
Grub screws**
Steel
* Denotes recommended spare parts. ** Stainless steel bolting option available on request.
Note: When hand wheel is added to standard actuator wiper ring, wiper ring retainer and stem guide are deleted.
The actuator stem is replaced with a longer stem to accommodate the hand wheel.
Table 1: Materials of construction
Reverse acting actuactor
Direct acting actuactor
Actuactor with hand wheel
19
29
11
22
13
12
20
10
14
25
23
26
27
1
28
15
16
31 30
18
17
32
21
24
04
W-Series Pneumatically Operated Spring & Diaphragm Actuators
Specifications
Table 2: Capacities
Table 4: Part numbering system
Actuator
Actuator travel
Zero volume
Swept volume
Volume at full travel
Size
in
mm
in2
cm2
in2
cm2
in2
cm2
75
1 1/8
28
32
524
83
1360
115
1884
150
1 1/2
38
92
1508
228
3737
320
5245
150
2 1/4
57
92
1508
343
5622
435
7130
300
2 1/4
57
255
4180
707
1.16 x 102
962
1.57 x 102
300
3 1/2
89
255
4180
1100
1.8 x 102
1355
2.22 x 102
W
2
J
N
225
0618
XX
A
B
C
D
EEE
FFFF
GG
A
W: Basic actuator model
B
1: Direct acting, 2: Reverse acting
C
H: 75in2, J: 150in2, K: 300in2
D
H: Side mounted hand wheel, T: Top mounted hand wheel, N: None
EEE
075:0.75", 113:1 1/8", 150:1 1/2", 225:2 1/4", 350:3 1/2"
FFFF
Spring range
GG
Special requirements
Table 3: Actuator forces
Actuator
Spring range *
Max working
Gross thrust
Nett thrust **
Spring force
pressure
(extended)
Size
lbf/in2
bar
lbf/in2
bar
lbf
kgf
lbf
kgf
lbf
kgf
75
3-15
0.2-1.0
60
4.1
4500
2040
3375
1530
225
102
6-30
0.4-2.0
2250
1020
450
204
3-9
0.2-0.6
3825
1735
225
102
150
3-15
0.2-1.0
60
4.1
9000
4080
6750
3020
450
204
6-30
0.4-2.0
4500
2040
900
408
3-9
0.2-0.6
7650
3470
450
204
300
3-15
0.2-1.0
50
3.4
15000
6800
10500
4760
900
408
6-30
0.4-2.0
6000
2720
1800
816
3-9
0.2-0.6
12300
5580
900
408
12-24
0.8-1.6
7800
3539
3600
1632
300X
20-40
1.4-2.8
50
3.4
15000
6800
3000
1360
6000
2721
* Standard spring without and bench pre-set
** Nett thrust is available after compressing spring.
W-Series Pneumatically Operated Spring & Diaphragm Actuators 05
Standard dimensions & weights
W-Series Operated Spring & Diaphragm Actuators
Size
Effective area
Travel
Mounting dia "A"
DIM "H1"
DIM "H2"
Weights (kg)
Ref
in2
cm2
in
mm
in
mm
in
mm
in
mm
W HW W/O HW
75
75
480
1/2
13
2 1/8
54
18.75
476
26.75
679
37.8
26.2
75
75
480
3/4
19
2 1/8
54
20.00
508
28.00
711
38.5
27.0
75
75
480
1 1/8
28
2 1/8
54
20.00
508
28.00
711
38.8
27.0
75
75
480
1 1/2
38
2 1/8
54
22.88
581
31.63
803
41.0
29.0
150
150
970
1 1/8
28
2 13/16
71.4
25.25
641
34.88
886
78.2
55.0
150
150
970
1 1/2
38
2 13/16
71.4
25.25
641
34.88
886
78.0
55.0
150
150
970
2 1/4
57
2 13/16
71.4
29.75
756
40.75
1035
83.5
59.0
150
150
970
2 1/4
57
3 9/16
90.5
29.75
756
40.75
1035
83.5
59.0
300
300
1930
2 1/4
57
3 9/16
90.5
36.88
937
49.25
1251
195.0
144.0
300
300
1930
3 1/2
89
3 9/16
90.5
41.00
1041
55.75
1416
204.0
148.5
Table 5: Dimensions
Size
DIM "D"
DIM "D1"
DIM "E"
Ref
in
mm
in
mm
in
mm
75
13
330
9
229
9
229
150
18
457
12
305
10.5
267
300
24.25
616
15
381
12.5
318
Table 5A: Dimensions
Our policy is one of continuous improvement and we reserve the right to modify these specification details without notice.
www.severnvalve.com
Head Office – Brighouse UK
Heywoods Industrial Park,
Birds Royd Lane,
Brighouse, HD6 1NA.
T: +44 (0)845 6070 710
E: sales@severnvalve.com
Gloucester UK
Olympus Park,
Quedgeley,
Gloucester, GL2 4NF.
T: +44 (0)845 223 2040
E: sales@severnvalve.com
Chennai India
F96 & F97, SIPCOT Industrial Park,
Irrungattukottai, Chennai,
Tamilnadu, India - 602 117.
T: +91 44 4710 4200
E: sales@severnvalve.com