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Spring to Center Actuator

This document describes a patented rotary actuator that springs back to a midpoint position when air pressure is removed. The actuator can be driven to either end stop and will precisely return to an adjustable center position due to opposing clock springs contained within a single housing. When energized with a dual coil solenoid valve, the actuator will move to one end; when de-energized, the springs precisely center it against physical stops. This spring-centered design provides reliable positioning in corrosive environments without complex equipment.

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A patented part-turn rotary actuator that is driven
to an end stop, in either direction, from an initial
centre position and is spring returned to an
accurate and positive mid point when the air
supply is removed. The mid-position can be set
mechanically anywhere in the actuator’s travel
range.
The spring to centre assemblies consist of one
double acting actuator fitted with two or more
opposing clock type springs contained within a
single housing. Controlled with a dual coil, 5/3
solenoid valve (or two 3/2 single coil valves)
which, when totally de-energised, allow the
springs to precisely centre the actuator against
physical stops. When either coil is energised the
actuator will travel towards one of its end stops.
As the vane moves towards an end stop the air
stroke torque reduces as the spring torque
increases and vice versa. When the coil is de-
energised the vane will spring return to its original
centre position. The usual ‘centre’ position will be
in the middle of the actuator’s 0 - 90 degree travel,
but this can easily be adjusted to any mid-stroke
location. A vernier scale on the adjustable plate
(see attached picture) permits precise mid-
position setting to within 1 degree.
SpringtoCentre
Actuators
For dimensions see page 57
(Actuator should be mounted to
application to enable adjustable centre
position and stationary end points)
Reliable low stress clock type springs.
Sealed, non-breathing housing protects
spring in corrosive environments.
Available in models 05 to 18
(excluding 15).
Stroke up to 100°
(200° option available - contact Kinetrol)
Mid position can be set mechanically
anywhere in the actuator’s travel range
using ‘vernier’ type scale.
Self contained spring assembly which can
be easily removed without a keeper plate.
Can be used in aggressive or hazardous
environments without the need for
complex or sensitive instruments.
Can be fitted with high temperature seal
option for up to 100°C
* Start torque when angle adjusted to mid position
Note: can be ordered without actuator eg. 050-0205
Actuator
Model *Start — Finish *Start — Finish
050-1205 19.2 — 17.5 170.0 — 169.9
070-1205 49.6 — 42.4 412.0 — 375.2
090-1205 99.0 — 93.8 876.0 — 830.1
120-1205 221.0 — 204.0 1956.0 — 1805.5
140-1205 533.0 — 478.0 4717.0 — 4230.6
160-1205 1009.0 — 933.0 8930.0 — 8257.7
180-1205 2686.0 — 2417.0 23771.0 — 21392.2
Torque - Nm
Based on 5.5 bar
Torque - lbf ins
Based on 80 psi

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Spring to Center Actuator

  • 1. 24 A patented part-turn rotary actuator that is driven to an end stop, in either direction, from an initial centre position and is spring returned to an accurate and positive mid point when the air supply is removed. The mid-position can be set mechanically anywhere in the actuator’s travel range. The spring to centre assemblies consist of one double acting actuator fitted with two or more opposing clock type springs contained within a single housing. Controlled with a dual coil, 5/3 solenoid valve (or two 3/2 single coil valves) which, when totally de-energised, allow the springs to precisely centre the actuator against physical stops. When either coil is energised the actuator will travel towards one of its end stops. As the vane moves towards an end stop the air stroke torque reduces as the spring torque increases and vice versa. When the coil is de- energised the vane will spring return to its original centre position. The usual ‘centre’ position will be in the middle of the actuator’s 0 - 90 degree travel, but this can easily be adjusted to any mid-stroke location. A vernier scale on the adjustable plate (see attached picture) permits precise mid- position setting to within 1 degree. SpringtoCentre Actuators For dimensions see page 57 (Actuator should be mounted to application to enable adjustable centre position and stationary end points) Reliable low stress clock type springs. Sealed, non-breathing housing protects spring in corrosive environments. Available in models 05 to 18 (excluding 15). Stroke up to 100° (200° option available - contact Kinetrol) Mid position can be set mechanically anywhere in the actuator’s travel range using ‘vernier’ type scale. Self contained spring assembly which can be easily removed without a keeper plate. Can be used in aggressive or hazardous environments without the need for complex or sensitive instruments. Can be fitted with high temperature seal option for up to 100°C * Start torque when angle adjusted to mid position Note: can be ordered without actuator eg. 050-0205 Actuator Model *Start — Finish *Start — Finish 050-1205 19.2 — 17.5 170.0 — 169.9 070-1205 49.6 — 42.4 412.0 — 375.2 090-1205 99.0 — 93.8 876.0 — 830.1 120-1205 221.0 — 204.0 1956.0 — 1805.5 140-1205 533.0 — 478.0 4717.0 — 4230.6 160-1205 1009.0 — 933.0 8930.0 — 8257.7 180-1205 2686.0 — 2417.0 23771.0 — 21392.2 Torque - Nm Based on 5.5 bar Torque - lbf ins Based on 80 psi