Introduction
2.2
Intended Use
The Bettis Q-Series Rack and Pinion actuators are intended for the automation and
operation of quarter-turn valves like Butterfly, Ball and Plug valves.
Rack and Pinion actuators can also be used to operate dampers or any other quarter-turn
applications.
2.3
Specifications
Table 1.
Pressure Range
Actuator Type
Pressure
Double-Acting
0.2 to 8.3 barg (2.9 to 120 psig)
Spring-Return
6 to 8.3 barg (87 to 120 psig), with maximum spring set
3 to 8.3 barg (43.5 to 120 psig), reduced spring quantity
Table 2.
Operating Media
Actuator Type
Operating Media
Double-Acting and Single-Acting
Air, dry or lubricated and inert gases
Dew point at least 10K below ambient temperature
For sub-zero applications, take appropriate measures
Mentioned pressure levels are "gauge pressures".
Gauge pressure is equal to absolute pressure minus
atmospheric pressure.
1. For the base actuator the recommended air quality for normal operation
(according ISO 8573-1) is: 7-5-4.
2.
In case Q-Series Control Modules are used, the operating media specification as mentioned in
the Installation Guide (shipped with each control module) are applicable.
QC41, QC42 or QC43:
Document DOC.IG.BQC41.1.
QC40:
Document
DOC.IG.BQC40.1.
QC54:
Document
DOC.IG.BQC54.1.
NOTE:
Use of filters, pressure regulators, lubricator and an oil/water separator mounted in the air
supply line, will allow a smooth and durable operation of the actuator.
For lubricated supply air, it is recommended to use a non-detergent oil without aggressive
additives, VG32, group 2 (ISO 3448).
Table 3.
Temperature Range
Actuator Type
Temperature
Standard
-20°C to +80°C (-4°F to +176°F)
1. In case Q-Series Control Modules are used, the temperature range as mentioned in
the Installation Guide (shipped with each control module) are applicable.
QC41, QC42 or QC43:
Document DOC.IG.BQC41.1.
QC40:
Document DOC.IG.BQC40.1.
QC54:
Document DOC.IG.BQC54.1.
Installation, Operation and Maintenance Manual
DOC.IOM.BQ.E Rev. 3
April 2019
5
Section 2: Introduction
