WILLIS Multiple Orifice Valve Chokes (MOV) Brochure Mov

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WILLIS
Multiple Orifice Valve (MOV) chokes

Content
WILLIS MOV chokes������������������������������������������������������������������������������������������������������������������������������������������� 2
Multiple orifice valves—multiple solutions ������������������������������������������������������������������������������� 4
Actuation����������������������������������������������������������������������������������������������������������������������������������������������������������������������� 6
MC10��������������������������������������������������������������������������������������������������������������������������������������������������������������������������������� 8
MC20������������������������������������������������������������������������������������������������������������������������������������������������������������������������������ 10
M1A�������������������������������������������������������������������������������������������������������������������������������������������������������������������������������� 12
M2������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������ 14
M3������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������ 16
M3G�������������������������������������������������������������������������������������������������������������������������������������������������������������������������������� 18
M4������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������ 20
M6������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������ 22
MOV positive chokes�������������������������������������������������������������������������������������������������������������������������������������� 24
Technical reference������������������������������������������������������������������������������������������������������������������������������������������ 26

1

WILLIS MOV Chokes
Greater control through technology
Cameron Multiple Orifice Valves (MOVs) together with four special trim designs are examples of the
many ways the company has solved customer problems throughout the years. In addition, this broad
product range exemplifies the many ways Cameron is committed to the application of state-of-the-art
technology to control production costs.
Research on materials also has helped Cameron control the effects of cavitation, erosion, a­ nd
freezing, three of the greatest threats to efficient flow control operations. This research provides
an extensive database where we can select the proper materials and alloys for specific choke
applications. Continuing investigations to determine the relative erosion, abrasion, and cavitation
resistance characteristic of materials allows Cameron to develop improved choke technologies for
enhanced durability and wear resistance.
The effects of abrasion, erosion, and cavitation can be reduced by applying hardfacing to the interior
surfaces of the choke outlet or by using an extended wear sleeve in the outlet.

In addition to testing chokes over a wide range of pressures,
Cameron measures flow rates and noise in a flow loop per
ISA specifications.

Our research has shown that specific grades of tungsten carbide are effective at reducing erosion
wear, while Stellite§ is most resistant to the destructive consequences of cavitation.
Combined with the proper disc design and valve/orifice sizing, we can help you greatly prolong the
wear life of the valve.
Sizing

At Cameron, our many years of experience tells us that paying close attention to the correct choke
sizing is the first and foremost means of avoiding problems later on.
That is why we place a special emphasis on making sure your MOV choke is sized correctly for your
particular application.
Getting it wrong has implications on controllability, maximum flow capacity, erosion, and the service
life of your equipment.

Cameron has an extensive erosion test facility with
specially designed equipment yielding high differential
pressure capabilities, as well as variable abrasive
content flow.

Using the Cameron choke sizing program with our experience in a diverse range of applications,
we’re there to help when it comes to choke sizing and selection.

MOV Chokes are available in various configurations and
include a range of actuator options.

2

Styles
Our MOV chokes are classified into four basic styles depending upon the
kind of service needed:
1. Style 0—standard service

Standard service valves are the lowest cost choke styles. They generally are
intended for sweet crude oil, deaerated water, sweet natural gas, and other
non-corrosive fluids.
2. Style 8—sour service

In addition to the requirements of the standard valve type, the materials of
the pressure containing parts of this style meet the requirements of NACE
MR-01-75. Sour service chokes are intended for applications with H2S
present as defined by NACE MR-01-75 requirements.
3. Style 4—wet CO2 service

This type of choke is intended for applications and service with wet CO2
(sweet or sour) and other applications where 410 or 316 SS is accepted.
All wetted pressure-containing parts are made of stainless steel.
4. Style C—low temperature/sour service

In addition to the requirements of standard and sour gas service chokes,
the requirements of API 6A specifications are met. This adds Charpy
impact testing of materials for pressure containing parts. These valves are
intended for cold −50 degF [−46 degC] flow and/or ambient conditions,
with or without sour service.

Trim solutions for every job
The purpose of the MOV is to provide accurate, calibrated flow control, and
increased choke service life in all applications, including erosive conditions.
Toward that goal, new disc designs have been required to meet new and
greater demands of better rangeability, higher capacity, and increasingly
severe conditions. These new disc designs involve altering the normally
round orifice shapes on the discs to adapt them for special conditions.
Extended range trim

As an example, in a water injection application on the Alaska North Slope,
an oil company required a large valve that could control flow in the same
manner as a small valve. A special trim was designed with spiral-shaped
holes. This unusually high-rangeability trim solved the problem and joined
the Cameron MOV line as our extended range trim.

Fully open

Throttling

Fully closed

Pie-shaped trim

To tackle the problem of increasing flow capacity without increasing choke
body size, Cameron introduced the pie-shaped trim. By enlarging the
holes to resemble a slice of pie, this trim increases flow volume (CV) while
reducing nominal body size. This reduces costs normally incurred by using
a larger nominal body.
Drilling choke trim
MOV drilling trim

Drilling conditions call for another special type of MOV trim. With
practically every drilling job, large cuttings come up the casing with the
mud. The cuttings can block the throttling restriction in many chokes.
However, our drilling choke trim is specially designed for mud service.
Utilizing a half-moon shaped hole, the drilling choke trim rotates through
a control range from fully open to fully closed in 180 degrees. This design
delivers control so reliable that the drilling choke outperforms other designs
for well killing and pressure control, especially in severe service involving
H2S, abrasive fluids, and high pressures.

3

Multiple Orifice Valves—Multiple Solutions
Operation and features
For more than six decades, the Cameron MOV choke has set the standard
for precision flow control in a wide variety of applications all over the world.
As one of the Cameron four main choke technologies, which includes needle
and seat chokes, control chokes, and multistage chokes, the MOV choke is
recognized for its proven durability and precise flow control.
The term multiple orifice refers to the exclusive design of the MOV, which
utilizes a set of adjacent discs, each containing a pair of circular openings
or orifices. Other shapes can be used for custom applications. The two
discs are diamond lapped on the mating surfaces to tolerances near two
light bands of flatness. This allows for complete shutoff over a prolonged
period and precise flow rate control throughout the service life of the
equipment. In fact, most MOV chokes meet the requirements of ANSI B104
Class IV shutoff as standard.
As one disc is rotated with respect to the other, the flow area is enlarged
from closed to fully open, affecting a change in the flowing volume of
liquid and/or gas passing through the choke. Differential pressures across
the discs hold them together. There are no loose or unsupported parts
to cause vibration, noise, or fatigue failures. The exposed portion of the
disc’s surface is wiped clean of foreign deposits each time the valve is
rotated. Rotational trim movement also reduces problems associated with
asphaltenes. These types of fluids tend to solidify on linear motion trims,
limiting throttling capabilities.
The circular shape of the MOV’s standard flow disc offers a smaller
wearing surface. Also, there is no interfacing shape in the center of the
flow area. The net result is less wear on the throttling and shut-off area and
a more accurate, calibrated flow rate which means an extended service life
with little downtime for maintenance.

100

The MOV’s design has another benefit, this time adding to its service life:
a second set of orifice wearing edges are available by simply rotating
the discs in the opposite direction. Standard MOV discs are made from
tungsten carbide, which is proven to give enhanced durability and erosion
resistance, even in high pressure drop and severe service conditions.

60
Lin
ea
r

Flow percent

Due to the simplicity in design, there are minimal wear components to
be replaced when the choke must be serviced, resulting in ease of field
maintenance, less downtime, and reduced operational costs.

80

40

20

0
Fully closed

Throttling

Fully open

0

20

40

60

80

The arrows below indicate the relative position of the front discs.
Dead band shut-off area provided by the front disc overlapping the back disc holes.

4

100

Applications
The Cameron MOV line covers 1- to 6-in [25- to 152-mm] sizes that can
handle pressures up to 10,000 psi while operating at temperatures ranging
from −50 to 650 degF [−46 to 343 degC]. They are manufactured to meet
API, ANSI, and NACE standards.
MOVs are available in both adjustable and positive configurations, as well
as angled and in-line body configurations, with a variety of end connections
to meet most requirements.
The near-linear flow characteristics of the MOV make it well-suited for
production choke applications including:
Wellhead

The first Cameron subsea choke supplied in 1975, installed in the Gulf of Mexico.

Attached to the wing valve on the Christmas tree, and provides great
control for oil and gas production.
Manifold

Used to maintain pressures and control flow rates in oil or gas production
systems, and for pressure control in choke and kill manifolds.
Separator letdown

Used as a quick open/quick close quarter-turn valve to maintain levels
in separators.
Heater bypass

Used on a secondary bypass loop to reduce and control gas pressure.
Water flood

Used to control injection rates for pressure maintenance and enhanced oil
recovery (EOR).
CO2

MOV chokes within a offshore platform installation.

Provides accurate injection control for EOR with great resistance to freeze up.
Gas lift

Used to maintain pressures and control gas injection rates in a well to aid
in oil production.

MOV inline/axial choke electrically actuated.

MOV angled chokes manually operated.

5

Actuation
The actuation of MOVs can take many forms, including:
■■

Manual bar handles

■■

Handwheel gear operator

■■

Linear pneumatic actuator

■■

Linear hydraulic actuator

■■

Electric actuation

■■

Stepping actuator

Any MOV can be actuated, and field conversion from manual to actuated
is possible on most models.

Pneumatic actuators
Pneumatic actuators are applicable to all of Cameron MOV choke models.
They are especially effective for economical, automated control of the M2
and larger choke valves. Accessories such as positioners, limit switches,
filter regulators, local pressure controllers, solenoid valves, and more are
available with pneumatic actuators.
Selecting the most economical size of actuator is determined primarily by
the turning torque required to effectively operate the choke. Diaphragm
actuators are preferred on many applications as they are more economical
than piston types, and they require only 35-psi line pressure to operate.
Piston actuators are required if the torque is in excess of, or near, the
maximum capabilities of the diaphragm actuators.

Pneumatic diaphragm actuated MOV choke.

A Cameron representative can assist you in the selection of the proper
pneumatic actuator for the specified MOV application. Cameron MOV
chokes are easily adapted to pneumatic actuation using ruggedlyconstructed actuator adapters.

Electric actuators
Electric actuators are most popular for applications on smaller MOV
chokes such as the MC10, M1A, and M2. These chokes are designed
with actuation in mind and provide for an extremely compact and
simple installation.
Electrically-actuated MOV chokes are especially applicable to field
automated production installations using closed-loop computer control
systems. Specific advantages include:
■■

Control capability over a wide range of flow rates

■■

The capability of electronically controlled positioning

■■

Near-linear increasing flow rates with increasing valve opening

■■

■■

Dynamic stability at all pressure drop and flow-rate conditions.
Availability of valve trim to allow for different ranges of flow rates, while
using the same actuator, valve body, and control software system
Low energy and torque requirements

Selection of electric actuators is primarily determined by the choke turning
torque required and the specific control feedback and environmental
considerations of the installation. Cameron electrically-actuated MOV
choke valves can be provided with adjustable travel stops, a potentiometer
for remote valve position readout, electronic speed control, weather-proof
and explosion-proof housings, and a manual override.
Electrically-actuated inline MOV choke.

6

Stepping actuators
The S-15,000 stepping actuator is designed to open and/or close MOV
chokes in precise one-degree increments. The capabilities of this heavyduty actuator make it particularly applicable to M3, M3G, M4, and M6
MOVs choke.
The S-15,000 draws its name from the amount of torque it delivers,
15,000 in-lb, and is designed to work with either 100 psi pneumatic or
1,000 to 3,000 psi hydraulic fluid supply. The proven design features of
the S-15,000 make it one of the top actuators for remote and automated
control for locations on land, offshore, or subsea. The S-15,000 operates
at temperatures from −30 to 180 degF [−34 to 82 degC] in a watertight,
marine corrosion-resistant enclosure. In subsea applications, the unit has
been tested and rated to operate at depths of 4,000 ft.
For remote readings of the choke’s position, there is a standard 5,000-ohm
potentiometer which can be used with a transmitter to provide a feedback
signal in milliamps.

MOV choke with S-15,000 stepping actuator.

External position indicators on surface models of the S-15,000 can read
percent open, degrees rotated, or bean size for a quick visual reference
of MOV position at any given time. The S-15,000 has been tested through
1,000,000 cycles without any malfunction. In the event of a pneumatic
or hydraulic supply failure, the actuator will remain locked in its last set
position. There is a manual override drive achieved by rotating one of the
two hex shafts external to the actuator housing with a wrench.
Because of these features, and the high operational reliability of the
S-15,000, it can be specified for any production operation onshore or
offshore that requires precise, trouble-free flow control.

S-15,000 stepping actuator-cross section view.

S-15,000 stepping actuator

7

MC10
The MC10 choke is a 1-in [25-mm] nominal in-line MOV choke, and is
suitable for a wide variety of applications. It is commonly used in water
and gas injection operations as part of enhanced recovery processes.
The MC10 choke’s precise control also has gained acceptance in gas
injection and gas lift operations, and production systems.

MC10 Choke Parts List
Key no. Description
1
Body
2
O-ring†
3
Backup ring†
4
Dowel pin
5
Capscrew
6
O-ring†
7
Outlet hub
8
Back disc†
9
O-ring†
10
Dowel pin
11
Front disc†
12
Calibration band
13
Drive screw
14
Handle
15
Indicator ring
16
Rotator
Wear sleeve‡

The trim design resists freezing in CO2 service. It also has positive shutoff
and adapts easily to field applications utilizing electric, hydraulic, and
pneumatic actuators.
The standard MC10 choke end connections are 1-in [25-mm] and 2-in
[51-mm] female threaded interfaces or 2-in [51-mm] flanges. Other options
are available subject to inquiry. Optional Stellite or tungsten carbide outlet
wear sleeves are available to protect against cavitation and erosion.
A backpressure bean can be added to the choke to provide a second
pressure drop to reduce choked flow conditions.

†
‡

Qty
1
2
2
4
6
1
1
1
1
1
1
1
2
1
1
1
1

Recommended spare parts for one year of operation.
Optional

14

12,13

7

4

10

Standard material
Ni-Al-Bz or stainless steel
Aflas
Teflon§
Stainless steel
Alloy
Teflon
Ni-Al-Bz or stainless steel
Ceramic or tungsten carbide
Teflon
Stainless steel
Ceramic or tungsten carbide
Stainless steel
Stainless steel
Alloy steel
Stainless steel
Ni-Al-Bz or stainless steel
Stellite or tungsten carbide

15
5
3

6

8

11
16

Wear sleeve
(optional)

1

9

A

8

2

MC10 Physical Dimensions
Inlet and outlet connections
1 in [25 mm] Female NPT, Ni-Al-Bz
1 in [25 mm] Female NPT, C.S., S.S.
2 in [51 mm] Female NPT
2 in [51 mm] ANSI Class 900 RF
2 in [51 mm] ANSI Class 900 RTJ
2 in [51 mm] ANSI Class 1500 RF
2 in [51 mm] ANSI Class 1500 RTJ
21/16 in [52.4 mm] 3000 API

Trim size
(number of holes)
diameter, in

MC10 trim

‡

Weight, lb [kg]
16 [7]
20 [9]
20 [9]
64 [29]
64 [29]
64 [29]
64 [29]
64 [29]

Maximum body pressure rating, psi—ANSI Class 1500‡

(1) 1/8
(2) 1/8
(1) 1/4
(2) 1/4
(1) ½
(2) ½
(2) 5/8

0.33
0.70
1.60
3.33
6.85
14.50
22.30

0
†

A, in [mm]
8.87 [225]
10.30 [262]
10.30 [262]
10.30 [262]
10.30 [262]
10.30 [262]
10.30 [262]
10.30 [262]

5

10
15
20
Flow coefficient Cv (maximum)†

25

Cv values given in table are subject to variation depending on valve end connections and options such as wear
sleeves and backpressure beans.
Valve pressure rating for specific configurations can be less depending on end connections, valve style and
use of ceramic or tungsten-carbide trim.

Bean size, 1/64 in
equivalent area

MC10 flow curves

56.4
(2) 5/8 in (pie)

20

15
45.3

Cv

(2) 1/2 in

10

(1) 1/2 in

32.0

5
(2) 1/4 in
(1) 1/4 in

0

0

10

20

30

40

50

60

70

80

22.6
16.0

90

Degree open, °

9

MC20
The MC20 choke is a 2-in [51-mm] nominal in-line MOV choke, with
suitability for multiple applications, particularly water, and gas injection
operations to achieve EOR. The MC20 choke’s precise control also
has gained acceptance in gas injection and gas lift operations, and
production systems.

MC20 Choke Parts List
Key no. Description
1
Outlet hub
2
Nut
3
Stud
4
Dowel pin
5
O-ring†
6
Front disc†
7
Belleville washer‡
8
Backup ring
9
Rotor
10
Body
11
O-ring†
12
Screw
13
Nameplate
14
Handle
15
Calibration band
16
Indicator ring†
17
Back disc†
18
O-ring†
19
Drive screw
Wear sleeve‡

The trim design resists freezing in CO2 service. It also has positive shutoff
and easily adapts to field applications utilizing electric, hydraulic, and
pneumatic actuators.
The MC20 choke is available with 2-in [51-mm] female threaded interfaces
or 2- to 4-in [51- to 102-mm] flanges. Other interface options are available
subject to inquiry. Optional Stellite or tungsten-carbide outlet wear sleeves
are available to protect against cavitation and erosion.
A backpressure bean can be added to the choke to provide a second
pressure drop to reduce choked flow conditions.

Trim size
(number of holes)
diameter, in

Maximum body pressure rating, psi—API Class 5,000‡
(2) 1/4
(1) ½
(2) ½
(2) 3/4
(2) 1
(2) 11/2

2.98
0.33
6.22
13.73
32.30
56.60
77.10

0

10

20

30

40

50

60

70

80

†

Flow coefficient Cv (maximum)

‡

†

†

‡

Qty
1
16
8
5
3
1
1
1
1
1
1
1
2
1
1
1
1
2
4
1

Recommended spare parts for one year of operation.
Optional

Cv values given in table are subject to variation depending on valve end connections and options such as wear
sleeves and backpressure beans.
Valve pressure rating for specific configurations can be less depending on end connections, valve style and use
of ceramic or tungsten-carbide trim.

12, 15

14

1
3

2

16

11

13, 19

4

5

7

17

6
Wear sleeve
(optional)
A

10

Standard material
Ni-Al-Bz or stainless steel
Alloy
Alloy
Stainless steel
Teflon
Ceramic or tungsten carbide
Inconel§ 718
Teflon
Alloy steel or stainless steel
Alloy steel or stainless steel
Teflon
Stainless steel
Stainless steel
Alloy steel
Stainless steel
Stainless steel
Ceramic or tungsten carbide
Buna-N
Stainless steel
Stellite or tungsten carbide

18

9
8

5

MC20 Physical Dimensions

2 in [51 mm] Female NPT
2 in [51 mm] ANSI Class 600 RF
2 in [51 mm] ANSI Class 600 RTJ
2 in [51 mm] ANSI Class 900 RF
2 in [51 mm] ANSI Class 900 RTJ
2 in [51 mm] ANSI Class 1,500 RF
2 in [51 mm] ANSI Class 1,500 RTJ
3 in [76 mm] ANSI Class 600 RF
3 in [76 mm] ANSI Class 600 RTJ
3 in [76 mm] ANSI Class 900 RF
3 in [76 mm] ANSI Class 900 RTJ
3 in [76 mm] ANSI Class 1,500 RF
3 in [76 mm] ANSI Class 1,500 RTJ
4 in [102 mm] ANSI Class 600 RF
4 in [102 mm] ANSI Class 600 RTJ
4 in [102 mm] ANSI Class 900 RF
4 in [102 mm] ANSI Class 900 RTJ
4 in [102 mm] ANSI Class 1,500 RF
4 in [102 mm] ANSI Class 1,500 RTJ
21/16 in [52.4 mm] API 3,000
21/16 in [52.4 mm] API 5,000
29/16 in [65.09 mm] API 3,000
29/16 in [65.09 mm] API 5,000
31/8 in [79.4 mm] API 3,000
31/8 in [79.4 mm] API 5,000
41/16 in [103.2 mm] API 3,000
41/16 in [103.2 mm] API 5,000

A
in
10.39
16.59
16.71
18.81
18.93
18.81
18.93
17.31
17.43
18.81
18.93
20.00
20.12
18.81
18.93
19.80
19.92
20.50
20.62
18.93
18.93
19.20
19.20
18.93
20.12
19.92
20.62

mm
264
421
424
478
481
478
481
440
443
478
481
483
486
478
487
503
506
521
524
481
481
488
488
481
486
506
524

Weight
lb
64
84
84
112
112
112
112
100
100
122
122
160
160
138
138
166
166
202
202
112
112
136
136
122
160
166
202

kg
29
38
38
51
51
51
51
46
46
56
56
73
73
63
63
76
76
92
92
51
51
62
62
56
73
76
92

Bean size, 1/64 in
equivalent area

MC20 flow curves

90.0
(2) 1 in (pie)

50

40

Cv

Inlet and outlet connections

30

(2) 3/4 in

68.0

(2) 1/2 in

45.0

(1) 1/2 in

32.0

20

10

(2) 1/4 in

0
0

10

20

30

40

50

60

70

80

23.0

90

Degree open, °

11

M1A

The M1A choke is designed for easy automation. You can change from
manual to actuated right in the field. No additional brackets or adjustments
are required for most models.

M1A trim
Maximum body pressure rating, psi—API Class 5,000‡

Trim size
(number of holes)
diameter, in

Like the MC10 choke, the M1A has the same economical, easy to replace
trim. The M1A choke is available with 1-in [25-mm] and 2-in [51-mm] male
threaded, 2-in [51-mm] male threaded, 2-in [51-mm] flanged or butt-weld
configurations. Other end connections are available as required. Optional
tungsten-carbide or Stellite outlet wear sleeves are available on the M1A
choke for erosive or cavitation conditions.

(1) 1/8
(2) 1/8
(1) ¼
(2) ¼
(1) ½
(2) ½
(2) 5/8

0.33
0.67
1.54
3.12
5.71
11.20
14.50

0

5

10

15

Flow coefficient Cv (maximum)†
Cv values given in table are subject to variation depending on valve end connections and options such as wear
sleeves and backpressure beans.
‡
Valve pressure rating for specific configurations can be less depending on end connections, valve style and use
of ceramic or tungsten-carbide trim.
†

M1A Choke Parts List
Key
Description
no.
1
Outlet hub
2
Capscrew
3
O-ring†
4
Carrier
5
Body
6
O-ring†
7
Front disc†
8
Thrust bearing†
9
O-ring
10 Backup ring†
11 Turning fork
12 Indicator plate
13 Bar handle
14 Plate screw
15 Stem screw
16 Back disc†
17 O-ring†
18 Backup ring†
19 Inlet hub
20 Thumbscrew
–
Wear sleeve (optional)
†

20
Qty Standard material

15

1
8
2
1
1
1
1
1
2
1
1
1
1
2
1
1
1
1
1
1
1

13

Ni-Al-Bz, alloy steel, or stainless steel
Alloy
Buna-N, Viton§ or aflas§
Ni-Al-Bz, alloy steel, or stainless steel
Ni-Al-Bz, alloy steel, or stainless steel
Buna-N, viton, or aflas
Ceramic or tungsten carbide
Delrin
Buna-N, Viton, or aflas
Teflon
Ni-Al-Bz or stainless steel
Stainless steel
Ni-Al-Bz
Stainless steel
Stainless steel
Ceramic or tungsten carbide
Buna-N, viton, or aflas
Teflon
Ni-Al-Bz, alloy steel, or stainless steel
Alloy steel
Tungsten carbide or stellite

14, 12
9
10
9
8

3

11
7
6
5
4
3
2

Recommended spare parts for one year of operation.

1

12

19

16
17
18

M1A dimensions

M1A Physical Dimensions
Inlet and outlet connections
1 in [25 mm] Female NPT
2 in [51 mm] Female NPT
2 in [51 mm] Male NPT
2 in [51 mm] Butt Weld
2 in [51 mm] ANSI Class 600 RF
2 in [51 mm] ANSI Class 600 RTJ
2 in [51 mm] ANSI Class 900 RF
2 in [51 mm] ANSI Class 900 RTJ
2 in [51 mm] ANSI Class 1,500 RF
2 in [51 mm] ANSI Class 1,500 RTJ
21/16 in [52.4 mm] 2,000 API
21/16 in [52.4 mm] 3,000 API
21/16 in [52.4 mm] 5,000 API

A
in
8.11
9.06
8.11
8.00
9.88
9.94
9.88
9.94
9.88
9.94
9.94
9.94
9.94

mm
206
230
206
203
251
252
251
252
251
252
252
252
252

B
in
6.00
6.95
6.00
5.89
7.77
7.83
7.77
7.83
7.77
7.83
7.83
7.83
7.83

mm
152
177
152
150
197
199
197
199
197
199
199
199
199

Weight
lb
kg
28
13
29
13
28
13
28
13
48
22
48
22
76
35
76
35
76
35
76
35
48
22
76
35
76
35

B

A

4.88

Bean size, 1/64 in
equivalent area

M1A flow curves

15
56.4
(2) 5/8 in (pie)

45.3
10

Cv

(2) 1/2 in

(1) 1/2 in

5
(2) 1/4 in

0

0

10

20

30

40

50

60

70

80

32.0

22.6

90

Degree open

13

M2
14

The M2 choke is a compact, 2-in [51-mm] nominal MOV choke used widely
throughout the world primarily for wellhead and production applications.
This closed die-forged body valve has a threaded bonnet for easy
maintenance and is available in several versions. The standard M2 choke is
bar-handle operated. Handwheel operators, electric, and pneumatic
actuators also are available.

M2 Choke Parts List
Key no. Description
1
Body
2
Disc assembly, back†
3
O-ring, bonnet†

Qty
1
1
1

4

Disc assembly, front†

1

5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20

Thrust bearing
O-ring, turning fork†
Backup ring†
Bonnet
Dowel pin†
Turning fork
Mounting flange
Calibration band†
Sheet metal screw†
Capscrew
Stud
Nut
Pointer
Shaft bushing
O-ring, turning fork†
O-ring, bonnet†
O-ring, back
disc assembly†
Indicat or head
Gear
operator, handwheel
Key
Drive shaft assembly
Capscrew
Mounting plate
Drive screw
Valve ID tag

1
1
3
1
4
1
1
1
4
1
8
8
1
1
2
1

Standard material
Alloy steel
Ceramic/SS or tungsten carbide/SS
Viton
Ceramic/SS or tungsten
carbide/SS
Delrin†
Viton
Teflon
Alloy steel
High-strength alloy
Alloy steel
Alloy steel
Stainless steel
Alloy steel
Stainless steel
High-strength alloy
High-strength alloy
Stainless steel
Turcite-A
Viton
Buna-N

1

Viton

1

Alloy steel

1

Alloy steel

1
1
4
1
4
1

High-strength alloy
Alloy steel
High-strength alloy
Alloy steel
Stainless steel
Stainless steel

21
22
23
24
25
26
27
28
29
†

12
13
17

22
23
24
25

27

26

16
15

11
8
19
28, 29
20
3
5
10
4
21
2

1

Recommended spare parts for one year of operation.

M2 chokes, manually operated.

14

13

18
9
7
6

M2 dimensions

M2 Choke Physical Dimensions
Inlet and outlet connections
2 in [51 mm] ANSI Class 600 RF
2 in [51 mm] ANSI Class 600 RTJ
2 in [51 mm] ANSI Class 900 RF
2 in [51 mm] ANSI Class 900 RTJ
2 in [51 mm] ANSI Class 1500 RF
2 in [51 mm] ANSI Class 1500 RTJ
2 in [51 mm] ANSI Class 2500 RF
2 in [51 mm] ANSI Class 2500 RTJ
21/16 in [52.4 mm] 2,000 API
21/16 in [52.4 mm] 3,000 API
21/16 in [52.4 mm] 5,000 API
29/16 in [65.09 mm] 2,000 API
29/16 in [65.09 mm] 3,000 API
29/16 in [65.09 mm] 5,000 API
3 in [76 mm] ANSI Class 600 RF
3 in [76 mm] ANSI Class 600 RTJ
3 in [76 mm] ANSI Class 900 RF
3 in [76 mm] ANSI Class 900 RTJ
3 in [76 mm] ANSI Class 1500 RF
3 in [76 mm] ANSI Class 1500 RTJ
3 in [76 mm] ANSI Class 2500 RF
3 in [76 mm] ANSI Class 2500 RTJ
31/8 in [79.4 mm] 2,000 API
31/8 in [79.4 mm] 3,000 API
31/8 in [79.4 mm] 5,000 API
111/16 in [42.9 mm] BX-150, 10,000
113/16 in [46 mm] BX-151, 10,000
21/16 in [52.4 mm] BX-152, 10,000
29/16 in [65.09 mm] BX-153, 10,000

mm
236
237
264
266
264
265
289
291
237
266
265
244
269
269
245
247
264
266
280
281
330
333
247
266
281
264
264
273
279

B
in
7.10
7.16
8.22
8.28
8.22
8.28
9.19
9.25
7.16
8.28
8.28
7.41
8.41
8.38
7.72
7.78
8.47
8.53
9.06
9.12
11.06
11.18
7.78
8.53
9.13
8.20
8.20
8.82
9.05

mm
180
182
209
210
208
210
233
235
182
210
210
188
213
213
196
197
215
216
230
232
281
284
197
216
232
208
208
224
230

Weight
lb
kg
84
38
84
38
110
50
110
50
110
50
110
50
144
65
144
65
84
38
110
50
110
50
90
41
116
53
116
53
102
46
102
46
126
57
126
57
156
71
156
71
204
93
204
93
102
46
126
57
156
71
121
55
121
55
126
57
133
60

(1) 1/8
(2) 1/8
(1) ¼
(2) ¼
(1) ½
(2) ½
(2) 5/8
(2) 3/4
(2) 7/8
(2) 1

C

B
A

C

12
Dimensions
C Adj: HW Gear = 14.50 in
C Adj: Bar Handle = 7.48 in
C Positive = 5.00 in

7.25

Bean size, 1/64 in
equivalent area

M2 flow curves

90.0

40

(2) 1 in (pie)

30

0.33
0.65
1.46
3.21

68.0

(2) 7/8 in

45.0
6.22

(2) 3/4 in
14.00
17.70 (special)

20

27.20
30.20 (special)

(2) 1/2 in

41.10

10

20

30

40

Flow coefficient Cv (maximum)†
‡

A

Body maximum pressure rating—API 10,000‡

0
†

B

Cv

Trim size
(number of holes) diameter, in

M2 trim

A
in
9.29
9.35
10.41
10.47
10.41
10.47
11.38
11.44
9.35
10.47
10.47
9.60
10.60
10.57
9.66
9.72
10.41
10.47
11.00
11.06
13.00
13.12
9.72
10.47
11.07
10.39
10.39
10.75
10.99

32.0

10

Cv values given in table are subject to variation depending on valve end connections and options such as wear
sleeves and backpressure beans.
Valve pressure rating for specific configurations can be less depending on end connections, valve style and
use of ceramic or tungsten-carbide trim.

(1) 1/2 in

0

(2) 1/4 in
(1) 1/4 in

23.0

(2) 1/8 in

0

10

20

30

40

50

60

70

80

90

Degree open, °

15

M3
The M3 choke is a 3-in [76-mm] nominal MOV that is used worldwide in
applications where high flow capacity is required. It is primarily used in
surface wellhead and production applications. As with all MOV models,
the M3 choke is available with multiple actuation options, including the
S-15,000 stepping actuator. It also is available with various end connection
options to suit specific requirements.

M3 Choke Parts List
Key no. Description
1
Body

Standard material
Alloy steel

2

Outlet flange assembly 1

3

Front disc assembly†

1

4

Back disc assembly†

1

5
6
7
8
9
10

Calibration band
Turning fork
Bonnet
Capscrew
Capscrew
Dowel pin†
Gear
operator, handwheel
Thrust bearing
Spacer ring
Gear operator adapter
Drive shaft assembly
Indicator head
Sheet metal screw†
Capscrew
Capscrew
Shaft bushing
Key
O-ring, turning fork†
O-ring, turning fork†
O-ring, outlet spool†
O-ring, outlet spool†
O-ring, bonnet†
O-ring, bonnet†
O-ring, bonnet†
O-ring, back
disc assembly†
Backup ring†
Flat washer
Drive screw
Valve ID tag

1
1
1
8
8
7

Ceramic/SS or tungsten
carbide/SS
Ceramic/SS or tungsten
carbide/SS
Stainless steel
Alloy steel
Alloy steel
Alloy
Alloy
Stainless steel

1

Alloy steel

1
1
1
1
1
2
2
8
1
1
1
2
1
2
1
1
1

Delrin
Alloy steel
Alloy steel
Alloy steel
Alloy steel
Alloy steel
High-strength alloy
High-strength alloy
Turcite-a
High strength alloy
Viton
Viton
Viton
Viton
Viton
Viton
Buna-N

1

Viton

3
2
4
1

Teflon
Alloy steel
Stainless steel
Stainless steel

11
12
13
14
15
16
17
18
19
21
22
24
25
26
27
28
29
30
31
32
33
34
35
†

16

Qty
1

†

Recommended spare parts for one year of operation.

Alloy steel

33, 18
17
5

16
11
22
15
14

7
13
10
34, 35
29
28
32, 24
12
6
3

19
30
8
21
25, 32

4

1

31
27
10

26

9
2

M3 dimensions

M3 Choke Physical Dimensions
B
in
8.47
9.22
9.82
8.41
8.48
9.16
9.22
9.75
9.81
11.75
11.87
9.22
9.72
10.07
9.16
9.22
9.66
9.72
10.01
10.07
12.63
12.82

mm
321
340
354
320
322
339
341
354
355
404
407
440
453
462
439
440
452
453
460
462
526
531

mm
215
234
249
213
215
232
234
248
249
298
301
234
246
255
232
234
245
246
254
255
320
325

Weight
lb
kg
137
62
161
73
193
88
137
62
137
62
161
73
161
73
193
88
193
88
286
130
286
130
185
84
205
93
251
114
185
84
185
84
205
93
205
93
251
114
251
114
398
181
398
181

‡

A

C

12

Dimensions
C Adj: HW Gear = 15.25 in
C Positive = 6.12 in

8

Bean size, 1/64 in
equivalent area

M3 flow curves
Body maximum pressure rating—ANSI class 2500‡

(1) ¼
(2) ¼
(1) ½
(2) ½
(2) 3/4
(2) 1
(2) 13/16
(2) 11/4
(2) 1.41

124.0

1.60
3.33
6.85

80

(2)
11/4 in (pie)

(2) 1.41 in (pie)

14.00

(2) 13/16 in

29.90
48.80
77.50

(2) 1 in

87.90

0

10

20

30

40

50

60

70

116.7
107.8

60

68.50

80

90

Flow coefficient Cv (maximum)†
†

B

Cv values given in table are subject to variation depending on valve end connections and options such as wear
sleeves and backpressure beans.
Valve pressure rating for specific configurations can be less depending on end connections, valve style and
use of ceramic or tungsten-carbide trim.

Cv

Trim size
(number of holes) diameter, in

M3 trim

9

90.6

40
(2) 3/4 in

68.0

Bean size, 1/64 in

A
Inlet and outlet connections
in
31/8 in [79.4 mm] 2,000 API
12.66
31/8 in [79.4 mm] 3,000 API
13.41
31/8 in [79.4 mm] 5,000 API
14.01
3 in [76 mm] ANSI Class 600 RF
12.60
3 in [76 mm] ANSI Class 600 RTJ
12.66
3 in [76 mm] ANSI Class 900 RF
13.35
3 in [76 mm] ANSI Class 900 RTJ
13.41
3 in [76 mm] ANSI Class 1500 RF
13.94
3 in [76 mm] ANSI Class 1500 RTJ 14.00
3 in [76 mm] ANSI Class 2500 RF
15.94
3 in [76 mm] ANSI Class 2500 RTJ 16.05
41/16 in [103 mm] 2,000 API
17.38
41/16 in [103 mm] 3,000 API
17.88
41/16 in [103 mm] 5,000 API
18.24
4 in [102 mm] ANSI Class 600 RF
17.32
4 in [102 mm] ANSI Class 600 RTJ 17.38
4 in [102 mm] ANSI Class 900 RF
17.82
4 in [102 mm] ANSI Class 900 RTJ 17.88
4 in [102 mm] ANSI Class 1500 RF 18.17
4 in [102 mm] ANSI Class 1500 RTJ 18.23
4 in [102 mm] ANSI Class 2500 RF 20.76
4 in [102 mm] ANSI Class 2500 RTJ 20.95

20

0
0

10

20 30

40

50

60

70

80

90

Degree open, °

17

M3G
30, 39
5

The M3G choke is a specially designed 3-in [76-mm] nominal MOV that has
been used in drilling choke applications for more than 15 years. Built for
severe abrasive service, it has a working pressure up to 10,000 psi and is
capable of taking a full 10,000-psi pressure drop with tungsten-carbide discs.
The M3G choke is well suited to high-pressure gas letdown applications
thanks to its enlarged outlet design which permits 4- to 6-in [102-to 152-mm]
flanges to be attached directly to the body for gas expansion. The discs are
located near the enlarged outlet, allowing high velocity fluids and particles
to pass through into the expanded cavity. The resulting deceleration reduces
wear on the choke outlet.

11
36
27
33
31
28
32
20
7
38
37
16
17
40, 41
12

Trim size
(number of holes) diameter, in

M3G trim
Body maximum pressure rating—psi API 10,000‡
(1) ¼
(2) ¼
(1) ½
(2) ½
(2) 3/4
(2) 1
(2) 13/16
(2) 11/4
(2) 1.41

1.60
3.33
6.85

29
8
13
14, 21

14.00

6
1

29.90
48.80
68.50
87.90

0

10

20

30

40

50

60

70

80

15, 21

4

77.50

3

18
19

90

Flow coefficient Cv (maximum)†

38

38
9

Cv values given in table are subject to variation depending on valve end connections and options such as wear
sleeves and backpressure beans.
‡
Valve pressure rating for specific configurations can be less depending on end connections, valve style and
use of ceramic or tungsten-carbide trim.
†

2

M3G Choke Parts List
Key
no.

Description

Qty

Standard material

1
Body
1
Alloy steel
2
Outlet flange assembly
1
Alloy steel
3
Back disc assembly†
1
Ceramic/SS or tungsten carbide/SS
†
4
Front disc assembly
1
Ceramic/SS or tungsten carbide/SS
5
Calibration band
1
Stainless steel
6
Turning fork
1
Alloy steel
7
Bonnet
1
Alloy steel
8
Capscrew
12
Alloy
9
Capscrew
16
Alloy
11
Sheet metal screw†
2
Stainless steel
12
Thrust bearing
1
Delrin
13
Shaft bushing
1
Turcite-a
14
O-ring, turning fork†
2
Viton
15
O-ring, turning fork†
1
Viton
16
O-ring, bonnet†
1
Viton
17
O-ring, bonnet†
1
Viton
18
O-ring, back disc assembly†
1
Viton
†
Recommended spare parts for one year of operation.

18

Key
no.

Description

Qty

Standard material

19
20
21
27
28
29
30
31
32
33
36
37
38
39
40
41

O-ring, outlet spool†
O-ring, bonnet†
Backup ring†
Gear operator, handwheel
Adapter for gear assembly
Drive shaft assembly
Capscrew
Capscrew
Capscrew
Key
Indicator head
Spacer ring
Dowel pin†
Flat washer
Drive screw
Valve ID tag

1
1
3
1
1
1
2
4
6
1
1
1
7
2
4
1

Viton
Buna-N
Teflon
Alloy steel
Alloy steel
Alloy steel
High-strength alloy
High-strength alloy
High-strength alloy
High-strength alloy
Alloy steel
Alloy steel
Stainless steel
Alloy steel
Stainless steel
Stainless steel

M3G Choke Physical Dimensions
Inlet connections

Outlet connections

3 in [76 mm] ANSI 600 RF
3 in [76 mm] ANSI 600 RTJ
3 in [76 mm] ANSI 900 RF
3 in [76 mm] ANSI 900 RTJ
3 in [76 mm] ANSI 1500 RF
3 in [76 mm] ANSI 1500 RTJ
3 in [76 mm] ANSI 2500 RF
3 in [76 mm] ANSI 2500 RTJ
31/8 in [79.4 mm] API 2,000
31/8 in [79.4 mm] API 3,000
31/8 in [79.4 mm] API 5,000
4 in [102 mm] ANSI 600 RF
4 in [102 mm] ANSI 600 RTJ
4 in [102 mm] ANSI 900 RF
4 in [102 mm] ANSI 900 RTJ
4 in [102 mm] ANSI 1,500 RF
4 in [102 mm] ANSI 1500 RTJ
4 in [102 mm] ANSI 2500 RF
4 in [102 mm] ANSI 2500 RTJ
41/16 in [103 mm] API 2,000
41/16 in [103 mm] API 3,000
41/16 in [103 mm] API 5,000
29/16 in [65 mm] BX-153 10K
31/16 in [78 mm] BX-154 10K
41/16 in [103 mm] BX-155 10K

4 in [102 mm] ANSI 600 RF
4 in [102 mm] ANSI 600 RTJ
4 in [102 mm] ANSI 900 RF
4 in [102 mm] ANSI 900 RTJ
4 in [102 mm] ANSI 1500 RF
4 in [102 mm] ANSI 1500 RTJ
4 in [102 mm] ANSI 2500 RF
4 in [102 mm] ANSI 2500 RTJ
41/16 in [103 mm] API 2,000
41/16 in [103 mm] API 3,000
41/16 in [103 mm] API 5,000
6 in [152 mm] ANSI 600 RF
6 in [152 mm] ANSI 600 RTJ
6 in [152 mm] ANSI 900 RF
6 in [152 mm] ANSI 900 RTJ
6 in [152 mm] ANSI 1,500 RF
6 in [152 mm] ANSI 1500 RTJ
6 in [152 mm] ANSI 2500 RF
6 in [152 mm] ANSI 2500 RTJ
71/16 in [179 mm] API 2,000
71/16 in [179 mm] API 3,000
71/16 in [179 mm] API 5,000
31/16 in [78 mm] BX-154 10K
31/16 in [78 mm] BX-154 10K
41/16 in [103 mm] BX-155 10K

A
in
14.22
14.28
14.72
14.78
15.07
15.13
17.72
17.91
14.28
14.78
15.13
20.27
20.33
21.16
21.22
22.38
22.50
26.38
26.63
20.32
21.19
22.51
15.41
15.41
16.88

mm
361
362
373
375
382
384
449
453
362
375
384
515
516
537
538
567
570
668
674
517
538
570
391
391
429

B
in
8.41
8.47
9.16
9.22
9.75
9.81
11.75
11.87
8.47
9.22
9.82
9.16
9.22
9.66
9.72
10.01
10.07
12.63
12.82
9.22
9.72
10.07
10.56
11.18
11.94

Weight
lb
kg
197
90
197
90
215
98
215
98
253
115
253
115
372
169
372
169
197
90
215
98
253
115
267
121
267
121
305
139
305
139
386
175
386
175
675
307
675
307
267
121
305
139
386
175
226
103
291
132
444
202

mm
213
215
231
234
248
249
298
301
215
234
248
232
234
245
246
254
256
320
325
234
246
256
268
284
303

Bean size, 1/64 in
equivalent area

M3G flow curves

M3G dimensions

124.0
(2)
11/4 in (pie)

80

9

(2) 1.41 in (pie)

(2)
13/16 in

116.7
107.8

B

Cv

(2) 1 in

A

90.6

40

C

(2) 3/4 in

68.0

Bean size, 1/64 in

60

20
12

0
Dimensions
C Adj: HW Gear = 15.25 in
C Positive = 6.12 in

0

10

20 30

40

50

60

70

80

90

Degree open, °

8

19

M4
The M4 choke is a 4-in [102-mm] nominal MOV that has found a great
deal of acceptance worldwide, particularly in large volume production
and in water-injection applications in the North Sea, Middle East, and
Alaskan North Slope. This choke is extensively used in surface wellhead
and production applications and has gained wide acceptance as a
high-quality subsea choke. The M4 choke affords easy actuation from
a variety of pneumatic diaphragm actuators to the Cameron S-15,000
stepping actuator.
M3 Choke Parts List
Key no. Description
Qty
1
Body
1
2
Outlet flange assembly 1
3

Front disc assembly†

1

4

Back disc assembly†

1

5
6
7
8
9
10
11
12
13
14

Calibration band
Turning fork
Bonnet
Capscrew
Capscrew
Dowel pin†
Bearing race
Thrust needle bearing
Thrust bearing race
O-ring, outlet spool†
Backup ring,
outlet spool†
O-ring, outlet spool†
O-ring, back
disc assembly†
O-ring, bonnet†
Backup ring†
O-ring, bonnet
O-ring, turning fork†
Backup ring†
O-ring, turning fork†
Key
Sheet metal screw
Gear
operator, handwheel
Adapter for
gear assembly
Spacer ring
Drive bushing
Indicator head
Capscrew
Nut
Stud
Key
Key retainer plug
Capscrew
Drive screw
Valve ID tag

1
1
1
12
12
6
1
1
1
1
1

Teflon

1

Viton

1

Viton

1
2
1
1
3
2
1
2

Viton
Teflon
Viton
Viton
Teflon
Viton
High-strength alloy
Stainless steel

1

Alloy steel

1

Alloy steel

1
1
1
2
4
4
1
1
4
4
1

Alloy steel
Alloy steel
Stainless steel
High-strength alloy
High-strength alloy
High-strength alloy
High-strength alloy
Alloy steel
High-strength alloy
Stainless steel
Stainless steel

16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
†

20

31
Standard material
Alloy steel
Alloy steel
Ceramic/SS or
tungsten carbide/SS
Ceramic/SS or
tungsten carbide/SS
Stainless steel
Alloy steel
Alloy steel
Alloy
Alloy
Stainless steel
Alloy steel
Alloy steel
Alloy steel
Viton

15

Recommended spare parts for one year of operation.

26

5
35
29
24
32, 33
27
8
7
10
19, 20
18,19
22, 23
21, 22
37, 38
6
3
1
4
52
17
10
9

2

25
30

34
36
13
12
11
22, 23
28

15, 16
14

M4 dimensions

M4 Physical Dimensions
Inlet and outlet connections
4 in [102 mm] ANSI Class 600 RF
4 in [102 mm] ANSI Class 600 RTJ
4 in [102 mm] ANSI Class 900 RF
4 in [102 mm] ANSI Class 900 RTJ
4 in [102 mm] ANSI Class 1500 RF
4 in [102 mm] ANSI Class 1500 RTJ
4 in [102 mm] ANSI Class 2500 RF
4 in [102 mm] ANSI Class 2500 RTJ
41/16 in [103 mm] API 2,000
41/16 in [103 mm] API 3,000
41/16 in [103 mm] API 5,000
6 in [152 mm] ANSI Class 600 RF
6 in [152 mm] ANSI Class 600 RTJ
6 in [152 mm] ANSI Class 900 RF
6 in [152 mm] ANSI Class 900 RTJ
6 in [152 mm] ANSI Class 1500 RF
6 in [152 mm] ANSI Class 1500 RTJ
6 in [152 mm] ANSI Class 2500 RF
6 in [152 mm] ANSI Class 2500 RTJ
71/16 in [179 mm] API 2,000
71/16 in [179 mm] API 3,000

A ± .12 in
in
mm
17.22 437
17.28 438
17.72 450
17.78 451
18.07 458
18.13 460
20.69 525
20.88 530
17.28 438
17.78 451
18.13 460
23.28 591
23.34 593
24.16 613
24.22 615
25.38 643
25.51 646
29.38 744
29.63 750
23.35 593
24.22 615

B ± .12 in
in
mm
12.34 313
12.40 315
12.81 326
12.87 327
13.19 335
13.25 336
15.81 401
16.00 406
12.40 315
12.90 327
13.25 336
18.40 467
18.46 469
19.28 489
19.34 491
20.50 519
20.62 523
24.50 620
24.75 627
18.47 469
19.34 491

Weight
lb
kg
403
183
403
183
425
193
425
193
469
213
469
213
685
311
685
311
403
183
425
193
539
245
414
188
414
188
445
202
445
202
504
229
504
229
790
359
790
359
414
188
445
202

M4 trim

13.50

B

A

20.50

18

Dimensions
C Adj: HW Gear = 20.50 in
C Positive = 6.25 in

12.25

Bean size, 1/64 in
equivalent area

M4 flow curves

(1) ½
(2) ½
(2) 3/4
(2) 1
(2) 13/16
(2) 11/2
(2) 2
(2) 25/16

214.6

6.85

200

14.00
29.90

181.2

57.20
87.80
130.00

(2) 2.00 in

224.0

0

50

100

150

(2) 1.50 in

200

Flow coefficient Cv (maximum)

†

Cv values given in table are subject to variation depending on valve end connections and options such as wear
sleeves and backpressure beans.
‡
Valve pressure rating for specific configurations can be less depending on end connections, valve style and
use of ceramic or tungsten-carbide trim.
†

(2) 25/16 in (pie)

150

188.0

136.0

Cv

Trim size
(number of holes) diameter, in

Body maximum pressure rating—ANSI class 2500‡

100

(2) 13/16 in
(2)
1.00 in

50

(2) 3/4 in

107.8
90.6
68.0

0
0

10

20

30

40

50

60

70

80

90

Degree open, °

21

M6
The M6 choke is a 6-in [152-mm] nominal MOV choke, and is the
largest MOV-style choke provided by Cameron. It has all the features
and benefits of the smaller MOVs but at a greatly increased working
capacity. As with all MOV models, the M6 choke is available with
multiple actuation options including the S-15,000 stepping actuator.
It also is available with various end connection options to suit
specific requirements.
M6 Choke Parts List
Key no. Description
Qty
1
Body
1
2
Outlet flange assembly 1
3

Front disc assembly†

1

4

Back disc assembly†

1

5
6
7
8
9
10
11
12
13
14
15

Calibration band
Turning fork
Bonnet
Capscrew
Capscrew
Dowel pin†
Sheet metal screw
Thrust needle bearing
Thrust bearing race
O-ring, outlet spool†
O-ring, outlet spool†
O-ring, back
disc assembly†
O-ring, bonnet†
O-ring, bonnet†
O-ring, turning fork†
Backup ring†
O-ring, turning fork†
Key
Gear
operator, handwheel
Indicator head
Capscrew
Spacer ring
Gear operator adapter
Drive bushing
Key
Pointer
Pointer riser
Capscrew
Stud
Nut
Set screw
Capscrew
Key retainer plug
Flow direction label
Drive screw
Valve ID Tag

1
1
1
16
16
6
2
1
2
1
1
1

Viton

1
1
1
3
2
1

Viton
Viton
Viton
Teflon
Viton
High-strength alloy

1

Alloy steel

1
2
1
1
1
1
1
1
4
8
8
1
4
1
1
6
1

Alloy steel
Stainless steel
Alloy steel
Alloy steel
Alloy steel
High-strength alloy
Stainless steel
Alloy steel
High-strength alloy
High-strength alloy
High-strength alloy
High-strength alloy
High-strength alloy
Alloy steel
Stainless steel
Stainless steel
Stainless Steel

18
20
21
22
23
24
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
†

22

Recommended spare parts for one year of operation.

5
1
28
34

40
27

Standard material
Alloy steel
Alloy steel
Ceramic/SS or
tungsten carbide/SS
Ceramic/SS or
tungsten carbide/SS
Stainless steel
Alloy steel
Alloy steel
Alloy
Alloy
Stainless steel
Stainless steel
Alloy steel
Alloy steel
Viton
Viton

17

29
35

33
24
39
8
10
12, 13
20
18
43, 44
7

41
32
36
37, 38
31
22, 23
30
21, 22

6
1
3

4
10
42, 43
9
2

17
15
14

M6 dimensions

M6 Choke Physical Dimensions
Inlet and outlet connections
6 in [152 mm] ANSI Class 600 RF
6 in [152 mm] ANSI Class 600 RTJ
6 in [152 mm] ANSI Class 900 RF
6 in [152 mm] ANSI Class 900 RTJ
6 in [152 mm] ANSI Class 1500 RF
6 in [152 mm] ANSI Class 1500 RTJ
71/16 in [179 mm] API 3,000
8 in [203 mm ] ANSI Class 600 RF
8 in [203 mm ] ANSI Class 600 RTJ
8 in [203 mm ] ANSI Class 900 RF
8 in [203 mm ] ANSI Class 900 RTJ
8 in [203 mm ] ANSI Class 1500 RF
8 in [203 mm ] ANSI Class 1500 RTJ

A ± .12 in
in
mm
26.31 669
26.37 670
27.19 691
27.25 692
28.44 721
28.57 724
27.25 692
32.88 835
32.94 836
34.01 863
34.07 865
36.01 912
36.20 916

B ± .12 in
in
mm
15.31 389
15.37 391
16.19 411
16.25 413
17.44 442
17.57 445
16.25 413
21.88 555
21.94 557
23.03 584
23.07 586
25.01 632
25.20 637

Weight
lb
kg
826
375
826
375
880
400
880
400
939
427
939
427
880
400
934
425
934
425
1086 494
1086 494
1258 572
1258 572

13.75

B

A

C

18

Trim size
(number of holes) diameter, in

M6 trim
Body maximum pressure rating—ANSI class 1500‡
(2) 3/4
(2) 1
(2) 13/16
(2) 11/2
(2) 2
(2) 25/16
(2) 31/8

Dimension
C Adj: HW Gear = 22.50 in

29.90
57.20
87.80

12.25
130.00
188.00
235.00
435.00

0

10

20

30

40

50

60

70

80

90

Flow coefficient Cv (maximum)†
‡

Bean size, 1/64 in
equivalent area

M6 flow curves

Cv values given in table are subject to variation depending on valve end connections and options such as wear
sleeves and backpressure beans.
Valve pressure rating for specific configurations can be less depending on end connections, valve style and
use of ceramic or tungsten-carbide trim.

400

283.0

(2) 31/8 in (pie)

300

(2) 25/16 in (pie)

Cv

†

200

214.6

(2) 2.00 in

181.3

(2) 1.5 in

136.0

100

20
0

10

20

30

40

50

60

70

80

90

Degree open, °

23

MOV Positive Chokes
Most of our MOV chokes have the capability
of being field converted from the standard
rotating disc design to a positive configuration.
Conversely, positive chokes can be field
converted to adjustable rotating discs when
desired. Removal of beans requires no special
tools and each bean is marked in 64th of an inch
for easy identification.

In-line Positive Choke
Size
Standard connections
2 in [51 mm]
1-in female threaded
1 in [25 mm] or 2 in [51 mm] 2-in male threaded
buttweld

Max. CWP Max. bean
5,000 psi
74 /64s

3 in [76 mm]
4 in [102 mm]

6,000 psi
5,000 psi

3-in buttweld
4-in buttweld

128 /64s
176 /64s

Bean material
Either stainless steel or
tungsten carbide come
in sizes up to 66/ 64s.
All larger orifice sizes come
in stainless steel.

In-line positive chokes
In-line positive chokes are available for
either standard service or high-temperature
applications. Standard chokes are constructed
with O-ring seals and are recommended for
temperatures less than 225 degF [107 degC].
High-temperature positive chokes are furnished
with spiral-wound flexitallic gaskets and are
designed for temperatures up to 750 degF
[399 degC]. Servicing is a simple matter of
loosening the hub flange bolts and partially
disassembling the connection to allow the
bean to be removed or replaced as required.

M2 Positive Choke Parts List
Key no.
Description
1
Body
2
Bonnet
3
Seat†
4
Bean insert†
5
O-ring, seat†
6
O-ring, bean†
7
O-ring, bonnet†
8
O-ring, bonnet†
9
O-ring, bonnet†

3

6

7

8

2

Quantity
1
1
1
1
1
1
1
1
1

Recommended spare parts for one year of operation.

†

1

24

5

4

9

M3 Positive Choke Parts List
Key no.
Description
1
Capscrew
2
Outlet flange assembly
3
Dowel pins†
O-ring, outlet spool
4
and bonnet†
5
O-ring, bean carrier†
6
Bean carrier†
7
Bean insert†
8
O-ring, bean†
9
Retainer plate
10
Retainer post
12
Body
13
Bonnet
†

2

34 3 5

6 7 89

12 10

4

1

4

13

1
1
1
1
1
2
1
1

Recommended spare parts for one year of operation.

M4 Positive Choke Parts List
Key no.
Description
1
Capscrew
2
Outlet flange assembly
3
Dowel pins†
4
O-ring, outlet spool†
5
O-ring, bean carrier†
6
Bean carrier†
7
Bean assembly†
8
O-ring, bean†
9
Retainer plate
10
Retainer post
11
O-ring, outlet spool†
12
Body
13
Bonnet
14
O-ring, bonnet†
15
O-ring, bonnet†
†

1

Quantity
16
1
3

1

Quantity
24
1
3
1
1
1
1
1
1
2
1
1
1
1
1

M2
M3
M3G
M4
M6

Available positive bean
sizes, in
2/64 to 74/64
2/64 to 96/64
2/64 to 96/64
2/64 to 176/64
176/64 to 304/64

10

1

13

Recommended spare parts for one year of operation.

MOV Positive Bean
Valve type

2 3 411 5 3 6 7 8

12

9

15

14

Bean material
Either stainless steel or
tungsten carbide come
in sizes up to 66/64s. All
larger orifice sizes come in
stainless steel.

25

Technical reference
Cameron Body Material Chart (Subject to change per Q.A./Engineering Evaluation)
Style 0
Style 8
Style 4
CO2 with or without H2S
Service
Standard service
H2S
temperature range,
Partial pressure, psi
ASTM API Type: 1,2,3
NACE MR-01-75
degF [degC]
0–3
(3–30)
−50 to 230 degF A350 LF2
A182 F6NM
8620
A352LCB/LCC† 8620
††
[−46 to 110 degC]
8620
8720
8720
A487 CA6NM
A350 LF2†
Style C
8720
4130†
4130
4130

30+
Inconel 625
Inconel 600
Incoloy 825
Alloy 20
Duplex§
A351 CF8M
316 SS
8351 CF3
A487 CA6NM
A182 F6NM
Inconel 625
Inconel 600
Incoloy 825
Alloy 20
Duplex§
316*
410 SS

A350 LF2†

−20 to 230 degF A 487 4N
[−29 to 110 degC]
A105

8620
8720
4130

A 487 4N†
A105
AA352LCC
A352LCB

†

8620
8720
4130

8620
8720
4130
A105†

8620
8720
4130

8620
8720
4130

†

410 SS
A182 F6a
A217 CA15

A216 WCB

−20 to 350 degF
[−29 to 110 degC]
A105

8620
8720
4130

A105†

A216 WCB

410 SS

Inconel 625
Inconel 600
Incoloy 825
Alloy 20
Duplex§
316‡
410 SS

A182 F6a
A217 CA15

A105†

Sea water

HCI environment

Inconel 625
Inconel 600
Incoloy 825
Alloy 20
Duplex§
316
8620
8720
4130

Hastelloy C276
Inconel 625
Alloy 20
Duplex§

Inconel 625
Inconel 600
Incoloy 825
Alloy 20
Duplex§
316
8620
8720
4130
NAIA Bronze‡
Inconel 625
Inconel 600
Incoloy 825
Alloy 20
Duplex§
316
8620
8720
4130
NAIA Bronze‡

Hastelloy C276
Inconel 625
Alloy 20
Duplex§

Hastelloy C276
Inconel 625
Alloy 20
Duplex§

Additional requirement: Hardness HRC22 max. as heat-treated seawater without H2S.
316 SS for high CO2 plus chloride.
§
Ferralium 255 or Sandvik 2205.
††
Includes Charpy impact testing for Style C.
Equivalent regarding corrosive resistance.
†
‡

MOV Trim Selection, Flow Coefficient Cv (Maximum)‡
Valve
type

Body maximum
pressure rating, psi†

MC20
MIA
MC10
M2
M3
M3G
M4
M6

API 5,000
API 5,000
ANSI Class 1500
API 10,000
API 6,250
API 10,000
API 6,250
API 3,750

Trim size (number of holes, diameter)
1, 1/8
–
0.33
0.33
–
–
–
–
–

2, 1/8
–
0.67
0.70
0.65
–
–
–
–

1, 1/4
–
1.54
1.60
1.46
1.60
1.60
–
–

2, 1/4
2.98
3.12
3.33
3.21
3.33
3.33
–
–

1, 1/2
6.22
5.71
6.85
6.22
6.85
6.85
6.85
–

2, 1/2
13.73
11.20
13.50
14.00
14.00
14.00
14.00
–

2, 5/8
–
14.50§
19.60§
17.70
17.70
17.70
17.70
–

2, 3/4
32.30
–
–
27.20
29.90
29.90
29.90
29.90

2, 7/8
–
–
–
30.20
–
–
–
–

2, 1
56.60
–
–
36.10§
48.80
48.80
57.20
57.20

Valve pressure rating for specific configurations can be less depending on end connections, valve style and use of ceramic- or tungsten-carbide trim.
Cv values given in table are subject to variation depending on valve end connections and options such as wear sleeves and backpressure beans.
§
Pie-shaped holes.
Because of continued research, testing and product improvement programs and flow coefficient, CV values are subject to change.
†
‡

26

2, 13/16
–
–
–
–
68.50
68.50
87.80
87.80

2, 11/4
77.10
–
–
–
77.50§
77.50§
–
–

2, 1.41
–
–
–
–
87.90§
87.90§
–
–

2, 11/2
–
–
–
–
–
–
130.00
130.00

2, 2
–
–
–
–
–
–
188.00
188.00

2, 25/16
–
–
–
–
–
–
218.00§
235.00§

2, 31/8
–
–
–
–
–
–
–
435.00

M2 choke with pneumatic actuator.

WILLIS

cameron.slb.com
­*Mark of Cameron
§
Other company, product, and service names
are the properties of their respective owners.
Copyright © 2016 Cameron. All rights reserved. SUR-1095



---

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Format                          : application/pdf
Title                           : WILLIS Multiple Orifice Valve chokes
Description                     : WILLIS Multiple Orifice Valve chokes
Creator                         : Schlumberger
Subject                         : MOV chokes, Cameron, actuation, control, trim
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