Emerson FieldQ Series Product Data Sheet page 31

Product data sheet
1.604.13 Rev. 4 Page 5 of 9
October 2018
Pneumatic components
The pneumatic components inside the module consist out of
one or two pilot valves and a 3/2 spool valve or 5/2 bistable
spool valve. The spool valves are pneumatically operated by
the pilot valves.
To assure trouble-free operation, the spool valves are
equipped with big ports. This enables a large air flow and
makes it less sensitive for contamination of the internals. The
large air flow also fast cycle times and enables it to be utilized
for the entire FieldQ Series actuator range.
Internal corrosion protection:
The spring return models have standard a built in "Breather"
function. During the spring stroke, the exhaust air from the
center chamber (A-Port) is first fed to the spring chamber
(B-port) preventing air from outside from being sucked into
the spring chamber. This reduces the possibility of internal
corrosion and maximizes the actuators' working life.
Pneumatic options
Speed Control
The QC40 control module can be supplied with a Speed
Control option. One throttle is required for Spring Return
actuators and up to two for Double Acting actuators.
The speed control throttle controls the air flow in and out of
an air chamber and as such limits the speed of the "Opening"
and "Closing" stroke simultaneously.
Silencers and vents
The exhaust ports Ra and Rb on the module are shipped
from the factory with transport protection.
The module can be equipped with either silencers or vents.
Manual Control
For commissioning, emergency or maintenance purposes,
the QC40 control module can be supplied with Manual
Control options. These options can operate the actuator
when there is air pressure available, but no control signal or
power supply.
- For normal operation the module should be fitted with
one Manual Control.
- For Double Acting with a Fail-in-Last-Position function,
two Manual Control can be fitted.
Maximum Flow Rates of Q-Series Modules
The maximum flow rates depends mainly on the flow rates
of the FieldQ modules. You can use K
of 0.38 (US gall/min 1 Psi) for approximate operating speed
calculations.
FieldQ
Copyright © Emerson. The information in this document is subject to change without notice. Updated data sheets can be obtained from our website
www.emerson.com/fieldq or from your Emerson Automation Solutions - Actuation Technologies Center:
America's: +1 281 477 4100 Europe: +36 22 53 0950 Asia/Pacific: +65 67 77 8211
0.33 (m /h) or C value
3
v v
Fail safe
(spring return)
Option: Throttle 1
3/2 Spool valve
Option: LMC
Ps
Pilot valve 1
Double acting
5/2 Spool valve
Option: LMC
Ps
Pilot valve 1
Double Acting
Fail in Last
Position
A-port
Option:
Throttle 1
5/2 Spool valve
Option: LMC 1
Ps
Pilot valve 1
Fig. 7. Pneumatic operation
FieldQ
A-port B-port
Ra
A-port B-port
Option:
Option:
Throttle 1
Throttle 2
Rb
Ra
B-port
Option:
Throttle 2
Option: LMC 2
Pilot valve 2
Rb
Ra