Double-Acting Operation With Fail-In-Last Position Function - Emerson Bettis Q Series Installation, Operation And Maintenance Manual

Section 4: Installation
April 2019
4.3.4

Double-Acting Operation with Fail-In-Last Position Function

The operating principle, as explained here, is applicable for actuators with assembly code
CW (direct acting).
•
•
•
Figure 7
Outward Stroke
Ps
1.
2.
3.
4.
14
The outward stroke will move the valve to the "Open" position.
The inward stroke will move the valve to the "Closed" position.
For assembly codes CC the operating principle is reversed (reverse acting):
Double-Acting Operation with Fail-In-Last Position Function
A-port B-port
Option:
Option:
Throttle 1
Throttle 2
5/2 Spool valve
Option: LMC 1
Pilot valve 1 Pilot valve 2
Send control signal "Open" to the Control Module to activate Pilot valve 1 and
de-activate Pilot valve 2.
The 5/2 spool valve will pressurize the central air chamber.
The piston will move outwards to the "Open" position.
The Control Module indicates the "Open" position and activates feedback
signal "Open".
Installation, Operation and Maintenance Manual
Option:
LMC 2
Rb
Ra
DOC.IOM.BQ.E Rev. 3
Installation