Emerson FieldQ Series Product Data Sheet page 21

Product data sheet
1.604.10 Rev. 0 Page 4 of 9
October 2017
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 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 FieldQ 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
FieldQ 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 XP modules. You can use Kv 0.28 (m
value of 0.28 (US gall/min 1Psi) for approximate operating
speed calculations.
FieldQ
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Fail safe
(spring return)
Ps
Double acting
Ps
Double Acting
Fail in Last
Position
/h) or Cv
3
Ps
A-port
Option: Throttle 1
3/2 Spool valve
Option: LMC
Pilot valve 1
A-port
Option:
Throttle 1
5/2 Spool valve
Option: LMC
Pilot valve 1
A-port B-port
Option:
Option:
Throttle 1
Throttle 2
5/2 Spool valve
Option: LMC 1 Option: LMC 2
Pilot valve 1 Pilot valve 2
FieldQ
B-port
Ra
B-port
Option:
Throttle 2
Rb
Ra
Rb
Ra