Emerson EL-O-Matic F Series - Spring-Return Actuators

Installation
4.3.4 Spring-Return Actuators
The operating principle, as explained here, is applicable for actuators with assembly code
CW (direct acting).
• Applying supply pressure to port A will move the pistons outwards to the "Open"
position of the valve.
• Venting the supply pressure from port A will cause the springs to move the pistons
inwards to the "Close" position of the valve.
• For assembly codes CC, the operating principle is reversed (reverse acting).
Figure 6 Stroke Movements
Outward Stoke
A
A
A
A
A
B
Inward Stroke
B
Installation, Operation and Maintenance Manual
DOC.IOM.EF.EN Rev. 7
September 2017
13
Section 4: Installation