Reassembly
9.5.3
Spring-Return Actuators (Size 950 to 1600)
Important
Bettis Q-Series Spring return actuators are supplied with springs on each side of the
actuator. Throughout the Q-Series size range, there are three different spring designs:
—
Sizes 40 to 600 have 6 springs on each side (Section 9.5.2).
—
Sizes 950 to 1600 have 3 springs on each side (see Figure 39).
Check below figures to see where to place the springs in case of spring set conversion.
When replacing springs in a spring-return actuator, ensure that the springs are replaced in
their identical position from where they were removed.
Before assembling the springs and end caps, make sure that the pistons are completely inwards.
Figure 39
Spring Placement Size 950 and 1600
A
B
1 spring
0 spring
1 spring
1 spring
2 springs
1 spring
2 springs
2 springs
3 springs
2 springs
3 springs
3 springs
Left
Right
Left
Right
Left
Right
Left
Right
Left
Right
Left
Right
N = 10
N = 20
N = 30
N = 40
N = 50
N = 60
A = Piston top view
B = Position of piston gear rack
50
April 2019
Installation, Operation and Maintenance Manual
DOC.IOM.BQ.E Rev. 3
Section 9: Reassembly
