Installation
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).
•
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):
Figure 7
Double-Acting Operation with Fail-In-Last Position Function
Outward Stroke
B-port
A-port
Ps
Pilot valve 1
5/2 Spool valve
Pilot valve 2
Option: LMC 1
Option:
LMC 2
Option:
Throttle 1
Option:
Throttle 2
Rb
Ra
1.
Send control signal “Open” to the Control Module to activate Pilot valve 1 and
de-activate Pilot valve 2.
2.
The 5/2 spool valve will pressurize the central air chamber.
3.
The piston will move outwards to the “Open” position.
4.
The Control Module indicates the “Open” position and activates feedback
signal “Open”.
14
April 2019
Installation, Operation and Maintenance Manual
DOC.IOM.BQ.E Rev. 3
Section 4: Installation