Product data sheet
FieldQ
FieldQ
Copyright © Emerson. The information in this document is subject to change without notice. Updated data sheets can be obtained from our website
www.emerson.com/fieldq or from your Emerson Automation Solutions - Actuation Technologies Center:
America’s:
+1 281 477 4100
Europe:
+36 22 53 0950
Asia/Pacific:
+65 67 77 8211
1.606.06 Rev. 0 page 2 of 3
October 2017
Torque output Double Acting
For double acting actuators the torque output level will not
change when adding the Full Stroke Adjustment option.
Examples torque change calculations
Starting point:
Actuator size QS150 with spring set 5 at 5 bar (80 psi)
Torque "Spring Start" at X° of stroke adjustment:
T
adj.spr.st.
= T
pub.spr.st.
- ([T
pub.spr.st.
- T
pub.spr.end
] x [{90-X°}/90°])
T
adj.spr.st.
= Torque at adjusted spring start stroke position.
T
pub.spr.st.
= Published spring start torque value for given
actuator size and spring set (see torque data sheets)
T
pub.spr.end
= Published spring end torque value for given actuator
size and spring set (see torque data sheets).
X° =
New rotation angle (in degrees).
Sample:
85 Nm = 119 - ([119 - 73] x [{90 - 22.5}/90])
749 lbf.in = 1056 - ([1056 - 647] x [{90 - 22.5}/90])
Torque "Air End" at X° of stroke adjustment:
T
adj.air.end
= T
pub.air.end
+ ([T
pub.air.st.
- T
pub.air.end
]) x ([90-X°]/90°)
T
adj.air.end
= Torque at adjusted air end stroke position.
T
pub.air.st.
= Published air start torque value for given actuator
size and spring set (see torque data sheets)
T
pub.air.end
= Published air end torque value
(see torque data sheets).
X° =
New rotation angle (in degrees).
Sample:
65 = 24 + ([78 - 24] x [{90-22.5}/90]), at 5 bar
712 = 336 + ([837 - 336] x [{90-22.5}/90]), at 80 psi
Sample torque output (Nm) for size QS150 with spring set 5 at 5 bar
Published
torque
Torque at rotation angle:
22.5°
45°
67.5°
Spring start
119 Nm
85 Nm
96 Nm
108 Nm
Spring end
73 Nm
73 Nm
73 Nm
73 Nm
Air start
78 Nm
78 Nm
78 Nm
78 Nm
Air end
24 Nm
65 Nm
51 Nm
38 Nm
Sample torque output (lbf.in) for size QS150 with spring set 5 at 80 psi
Published
torque
Torque at rotation angle:
22.5°
45°
67.5°
Spring start
1056 lbf.in
749 lbf.in
852 lbf.in
954 lbf.in
Spring end
647 lbf.in
647 lbf.in
647 lbf.in
647 lbf.in
Air start
837 lbf.in
837 lbf.in
837 lbf.in
837 lbf.in
Air end
336 lbf.in
712 lbf.in
587 lbf.in
461 lbf.in
Torque output Spring Return
For spring return actuators, the torque output levels do change
when adding the Full Stroke Adjustment option.
Torque
Stroke
adjust-
ment
Rotation X°
Torque output for double acting actuators
does not change when adding Full Stroke
adjustment option.
Air Stroke:
- Air start value will not change, assuming the inward stroke
position is set at 0°
- Air end value will change depending on the amount of stroke
adjustment. The torque value changes linearly
between the Air-End and the Air-Start value.
Spring Stroke:
- Spring start value will change depending on the amount of
stroke adjustment. The torque value changes linearly between
the Spring-Start and the Spring-End value.
- Spring end value will not change, assuming the inward stroke
position is set at 0°.
Spring stroke
E =
Start
F =
End
Torque
Rotation X°
Clockwise
new value
Stroke
adjust-
ment
Air stroke
C =
Start
D =
End
Torque
Rotation X°
Counter
Clockwise
new value
Stroke
adjust-
ment
