Master Flo’s subsea and surface choke product lines are

complemented by actuation technology of an exceptional

performance. These robust efficient and reliable actuators
meet the increasing demands of today’s oil field and
offshore environments.
The hydraulic and pneumatic systems allow for optimum
control of production. The rigorous testing and qualification
done on these units ensure reliability and long-term life.
With an in-house research and development department
and state-of-the-art testing facilities, Master Flo is
committed to the continuous improvement required to
meet the dynamic needs of today’s oil and gas industry.



 Designed specifically to handle the severe service
applications seen on offshore platforms, this
double-acting pneumatic piston actuator has a
proven performance track record. The actuator
is environmentally sealed to reduce many of the
corrosion effects common to the industry.

Operator safety and environmental awareness,

always a concern at Master Flo, has resulted in
a design that is without exposed linkages. The
double-acting piston operates on a minimum
of 80 psi pneumatic supply providing a stiff
control system for higher pressure choke valves.
The internal spring bias provides fail-closed
operation features on loss of pneumatic or
electrical signal.

Pneumatic PDA 50/100/200 Specifications

Construction Materials Carbon or low alloy steel
Piston Area PDA 50: 46 square inch
PDA 100: 91 square inch
PDA 200: 185 square inch
Input Signal 3-15 psig, 6-30 psig, 4-20 mA, HART, fieldbus *
Output Signal 4-20 mA, HART, fieldbus
Supply Pressure 80 - 150 psig
Accuracy ± 1 to 3% full scale *
Certification CSA/FM/UL explosion proof or ATEX intrinsically safe or flameproof *
Operating Medium instrument air, sweet instrument gas also available
Temperature Range -20 to +150° F
Fail Action spring-assist fail close - standard, fail lock also available
Master FLo Pneumatic Piston Actuators are suitable for use with a variety of positioners.
 * positioner dependent
The double-acting pneumatic piston actuator is available in three models to
optimize fit for purpose selection. Units are available with single-, double- and
triple-spring configurations depending on thrust requirements. All units can be
suppplied to CSA, UL or Atex certification and can be equipped with an optional
manual override feature.

PDA 50 PDA 100 PDA 200

Weight = 70 lbs. [32 kg] Weight = 245 lbs. [111 kg] Weight = 385 lbs. [175 kg]
D = 9.00 in. [229 mm] D = 12.25 in. [311 mm] D = 16.75 in. [425 mm]
L L L
Valve Model in mm in mm in mm
P1E 27.00 686 - - - -
C1E 28.28 718 - - - -
P2E 27.28 693 34.89 886 34.89 886
C2E 29.03 737 36.64 931 36.64 931
P25E 27.35 695 34.93 887 34.93 887
C25E 29.10 739 36.72 933 36.72 933
P3E 30.28 769 38.12 968 38.12 968
C3E 32.59 828 40.44 1027 40.44 1027
P35E - - 43.36 1101 43.36 1101
P4E - - 43.36 1101 43.36 1101
C4E - - 47.11 1197 47.11 1197
P5E - - 45.69 1160 45.69 1160
P6E - - 49.45 1256 49.45 1256
P8E - - - - 54.06 1373


 The linear hydraulic actuator is custom designed
for Master Flo chokes to provide the optimum
thrust output required by our choke valve line.
Designed to provide light, compact and efficient
operation for choke valves, this 3,000 psi
hydraulic supply actuator is a modified double-
acting piston design.

As with all Master Flo actuators, environmental

protection and operator safety promotes a design
with a sealed accessory drive mechanism and
no exposed linkages. The actuator is normally
equipped with a position feedback unit; however
an optional hydraulic control system can be
fitted to allow the operator to input a 4-20 mA
signal to position the choke.

Hydraulic FC1/FC2/FC3 Specifications

Construction Materials Carbon or low alloy steel
Piston Area FC1: open: 8.8, close: 4.7
(square inch) FC2: open: 20.1 (P2, P25), 17.7 (P3, P3-10K); close: 8.3 (all)
FC3: open: 24.3, close: 12.4
Input Signal 4-20 mA (with control system)
Output Signal 4-20 mA
Supply Pressure 1500-3000 PSIG
Accuracy ± 1% of full scale (with control system)
Certification CSA/FM/UL: explosion proof or ATEX:intrinsically safe or flameproof
Operating fluids mineral oil based hydraulic fluid (Brayco Micronic 864 standard)
Temperature Range -20 to 150° F
Cleanliness Requirements minimum NAS 1638 Class 9 (with control system)
 Fail Action fail close, fail open or fail last
The double acting hydraulic piston is available in three models to optimize fit for
purpose selection. All units can be supplied to CSA, UL or Atex certification and can
be equipped with an optional manual override (hand pump) feature. The unique
cylinder design can provide fail-closed, fail-open or fail-last position operation.

FC1 FC2 FC3

Weight = 40 lbs. [18 kg] Weight = 80 lbs. [36 kg] Weight = 120 lbs. [54 kg]
L L L
Valve Model in mm in mm in mm
P1E 19.44 494 - - - -
C1E 20.72 526 - - - -
P2E - - 24.31 618 - -
C2E - - 26.06 662 - -
P25E - - 24.35 619 - -
C25E - - 26.10 663 - -
P3E - - 27.78 706 - -
C3E 30.09 764 - -
P35E - - - - 40.22 1022
P4E - - - - 40.22 1022
C4E - - - - 43.97 1117
P5E - - - - 41.41 1052
P6E - - - - 45.16 1147
P8E - - - - 49.53 1258


 The Master Flo Stepping Actuator is designed to
operate our P2 through P10 choke valves using
pneumatic or hydraulic supply. The precision and
high torque generated through the 36° incremental
steps makes this actuator an excellent choice for
higher pressure valves.
The actuator system has been subjected to
extensive endurance testing and has a superior field
performance record of durability and reliability. The
operating principal consists of independent systems
for the closed and open operation. Each system
utilizes a spring-biased cylinder to provide linear
thrust which is converted to rotary action through the
actuator mechanism.
This rotary action provides the torque necessary to
rotate the standard stem nut operating the valve. This
makes this actuator ideal for field conversion where
manual valves are converted to actuated units.

Stepping Actuator Specifications

Actuator Weight 165 lbs
Operating Temperature Range (-20° F to 180° F)
Output Rotation per Step 36°
pneumatic 160 ft-lbs @ 100 psig
Rated Output Torque: pneumatic high torque 310 ft-lbs @ 100 psig
hydraulic 320 ft-lbs @ 3,000 psig
pneumatic 150 psig max
Operating Supply: pneumatic high torque 100 psig max
hydraulic 3,000 psig max
Air Consumption: 2.6 scfm (std.), 5.1 scfm (high torque)
Hydraulic Consumption 1.3 cuin/step
Operating Cylinder Connection 1/4” NPT, (1/2” NPT for HT)

Manual Override Drive 11/2” hex

Local Position Indication Scale 0-100% travel
Position Transmitter Connection 3/4” NPT

Position Feedback Resolution ± 0.5 steps

Position Feedback Linearity ± 1.2% max
 Note: 2 sec/cycle operating speed &100 psig supply
The rotary stepping actuator is available for 100 psi pneumatic or 3,000 psi
hydraulic supply pressure. This actuator is typically operated through solenoids in
conjunction with position feedback supplied from a 4-20 mA position transmitter
unit. This provides remote monitoring of the choke position. Optional positioner
control systems are available which will allow the operator to input a 4-20 mA signal
to position the choke. All units come with a 11/2” hex drive for manual operation or
can be equipped with a declutchable handwheel.

Stepping Actuator
Weight = 165 lbs. [75 kg]
L Number
Valve Model in mm of Steps
P1E - - -
C1E - - -
P2E 16.83 427 110
C2E 17.20 437 110
P25E 16.83 427 120
C25E 17.20 437 120
P3E 20.39 518 170
C3E 22.70 577 170
P35E 27.11 689 160
C35E 30.86 784 160
P4E 27.11 689 200
C4E 30.86 784 200
P5E 28.59 726 225
P6E 32.38 822 270
P8E 32.59 828 335


 Master Flo prides itself on its versatility and ability
to adapt to customer requirements, and third party
actuation on our choke valves is another example of this
commitment. Most Master Flo chokes are available with
a wide array of actuator types and models as project
requirements prescribe.
Shown here is one of the more comon type; the Fisher
diaphragm actuator suitable for operation with 20 or 35 psi
supply and fail-open or fail-closed configurations.

For unique piping configurations or areas with space

constraints, Master Flo offers a right-angle mounting
hardware for linear actuators.
This option allows the operator to configure the actuator
orientation at right angles to the valve stem axis. Since
the hardware is fixed to the valve body, another benefit
of this mounting is valve service. The actuator and its
utility connections can remain in position when servicing
the valve internals.

10
Master Flo Chokes for All Applications

Surface Chokes
Production Chokes
• oil production
• gas production
• water injection
• gas lift
• gas injection
• blow down
• vent valves
• steam service
• HP/HT

Subsea Chokes
• non-retrivable bolted bonnet
• diver insert retrievable
• tool insert retrievable
Qualified to 11,200 feet water depth.

Control Valves
Specialty Control Valves
• high- pressure applications
• cavitation
• erosive service
• critical shut-off applications
• high temperature

11
Canada Kuala Lumpur, Malaysia
Head Office Tel: 60 (0)3 2078-7688
Master Flo Valve Inc. Fax: 60 (0)3 2078-7689
4611 - 74 Avenue
Edmonton, Alberta Jakarta, Indonesia
Canada T6B 2H5 Tel: 62 (0)21 7918 1234
Tel: (780) 468-4433 Fax: 62 (0)21 7918 2575
Fax: (780) 469-9853
Pau, France
#400, 202 - 6 Avenue SW Tel: 33 (0)5 5992-8229
Calgary, Alberta Fax: 33 (0)5 5992-8261
Canada T2P 2R9
Tel: (403) 237-5557 Rio de Janeiro, Brazil
Fax: (403) 266-3307 Tel: 55 (0)21 2532-5618
Fax: 55 (0)21 2220-7677
Houston, Texas, USA
Master Flo Valve (USA) Inc. Argentina
Tel: 1 713 690-2789 Tel: 54 (911) 5810-8044
Fax: 1 281 517-0007
Beijing, China
Aberdeen, Scotland Tel: 86-10-6583 0338
Tel: 44 (0)1224 878999 Fax: 86-10-6583 3006
Fax: 44 (0)1224 878989

Abu Dhabi, United Arab Emirates

Tel: 971 (0)2 6329150
Fax: 971 (0)2 6321276

www.masterflo.com

Copyright © 2011 Master Flo Valve Inc. - January 2011