Installation
4.3.2
Ingress Protection (IP) Rating
Bettis Q-Series actuators are IP66 / NEMA4 rated. In case of IP66 or NEMA4 requirements,
take precautions that comply with the IP66 / NEMA4 requirements to prevent moisture or
dust from entering the actuator through the open air exhaust port(s), either directly on the
actuator or at the exhaust ports of the connected solenoid valve.
We recommend to connect tubing to the exhaust(s) and lead this into a dry and dust free
area, or to use check valves in the exhaust.
4.3.3
Control Module Operation
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 5
Double-Acting Operation
Outward Stroke
B-port
A-port
Ps
Rb
5/2 Spool valve
Ra
Option: LMC
Option:
Throttle 1
Option:
Throttle 2
Pilot
valve 1
1.
Send control signal “Open” to the Control Module.
2.
Pilot valve 1 will be activated and the 5/2spool 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”.
12
April 2019
Installation, Operation and Maintenance Manual
DOC.IOM.BQ.E Rev. 3
Section 4: Installation