WILLIS Multiple Orifice Valve Chokes (MOV) Brochure Mov

User Manual: WILLIS Multiple Orifice Valve (MOV) Chokes Brochure Resource Library

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WILLIS

Multiple Orifice Valve (MOV) chokes

1

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

2

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, and

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.

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.

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.

WILLIS MOV Chokes

In addition to testing chokes over a wide range of pressures,

Cameron measures flow rates and noise in a flow loop per

ISA specifications.

Cameron has an extensive erosion test facility with

specially designed equipment yielding high differential

pressure capabilities, as well as variable abrasive

content flow.

MOV Chokes are available in various configurations and

include a range of actuator options.

3

MOV drilling trim

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.

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

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

HS, abrasive fluids, and high pressures.

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 HS

present as defined by NACE MR-01-75 requirements.

3. Style 4—wet CO service

This type of choke is intended for applications and service with wet CO

(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.

Fully open Throttling Fully closed

4

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.

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.

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.

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.

Flow percent

Multiple Orifice Valves—Multiple Solutions

Linear

Fully closed Throttling Fully open

100

80

60

40

20

0

0 20 40 60 80 100

5

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

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).

CO

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.

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

MOV chokes within a offshore platform installation.

MOV angled chokes manually operated.MOV inline/axial choke electrically actuated.

6

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.

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 ruggedly-

constructed 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.

Pneumatic diaphragm actuated MOV choke.

Actuation

7

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 heavy-

duty 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.

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.

MOV choke with S-15,000 stepping actuator.

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

S-15,000 stepping actuator

8

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.

The trim design resists freezing in CO 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.

MC10 Choke Parts List

Key no. Description Qty Standard material

1 Body 1 Ni-Al-Bz or stainless steel

2 O-ring†2 Aflas

3Backup ring†2 Teflon§

4Dowel pin 4Stainless steel

5 Capscrew 6 Alloy

6 O-ring†1 Teflon

7Outlet hub 1Ni-Al-Bz or stainless steel

8Back disc† 1 Ceramic or tungsten carbide

9 O-ring†1 Teflon

10 Dowel pin 1Stainless steel

11 Front disc†1Ceramic or tungsten carbide

12 Calibration band 1Stainless steel

13 Drive screw 2Stainless steel

14 Handle 1 Alloy steel

15 Indicator ring 1Stainless steel

16 Rotator 1 Ni-Al-Bz or stainless steel

-Wear sleeve‡1Stellite or tungsten carbide

† Recommended spare parts for one year of operation.

‡ Optional

MC10

14

7

4

12,13

5

1

2

16

Wear sleeve

(optional)

11

9

8

15

6

10

3

A

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.

MC10 trim

Maximum body pressure rating, psi—ANSI Class 1500‡

Flow coefficient Cv (maximum)†

MC10 Physical Dimensions

Inlet and outlet connections A, in [mm] Weight, lb [kg]

1 in [25 mm] Female NPT, Ni-Al-Bz 8.87 [225] 16 [7]

1 in [25 mm] Female NPT, C.S., S.S. 10.30 [262] 20 [9]

2 in [51 mm] Female NPT 10.30 [262] 20 [9]

2 in [51 mm] ANSI Class 900 RF 10.30 [262] 64 [29]

2 in [51 mm] ANSI Class 900 RTJ 10.30 [262] 64 [29]

2 in [51 mm] ANSI Class 1500 RF 10.30 [262] 64 [29]

2 in [51 mm] ANSI Class 1500 RTJ 10.30 [262] 64 [29]

2⁄ in [52.4 mm] 3000 API 10.30 [262] 64 [29]

(1) ⁄

(2) ⁄

(1) ⁄

(2) ⁄

(1) ½

(2) ½

(2) ⁄

0.33

0.70

1.60

3.33

6.85

14.50

22.30

0 5 10 15 20 25

Trim size

(number of holes)

diameter, in

Bean size, ⁄ in

equivalent area

Degree open, °

20

15

10

5

0

0 10 20 30 40 50 60 70 80 90

56.4

45.3

32.0

22.6

16.0

(2) ⁄ in (pie)

(2) ⁄ in

(2) ⁄ in

(1) ⁄ in

(1) ⁄ in

MC10 flow curves

Cv

10

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.

The trim design resists freezing in CO 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.

MC20

MC20 Choke Parts List

Key no. Description Qty Standard material

1Outlet hub 1Ni-Al-Bz or stainless steel

2 Nut 16 Alloy

3 Stud 8 Alloy

4Dowel pin 5Stainless steel

5 O-ring†3 Teflon

6Front disc†1Ceramic or tungsten carbide

7Belleville washer‡1 Inconel§ 718

8Backup ring 1 Teflon

9 Rotor 1 Alloy steel or stainless steel

10 Body 1 Alloy steel or stainless steel

11 O-ring†1 Teflon

12 Screw 1 Stainless steel

13 Nameplate 2 Stainless steel

14 Handle 1 Alloy steel

15 Calibration band 1Stainless steel

16 Indicator ring†1Stainless steel

17 Back disc†1Ceramic or tungsten carbide

18 O-ring†2 Buna-N

19 Drive screw 4Stainless steel

-Wear sleeve‡1Stellite or tungsten carbide

† Recommended spare parts for one year of operation.

‡ Optional

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

Flow coefficient Cv (maximum)†

(2) ⁄

(1) ½

(2) ½

(2) ⁄

(2) 1

(2) 1⁄

0.33

0 10 20 30 40 50 60 70 80

Trim size

(number of holes)

diameter, in

14

16

7

13, 19

211

1

3

5

12, 15

Wear sleeve

(optional)

6

5

18

17

A

9

8

2.98

6.22

13.73

32.30

56.60

77.10

† 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.

4

11

MC20 Physical Dimensions

Inlet and outlet connections A Weight

in mm lb kg

2 in [51 mm] Female NPT 10.39 264 64 29

2 in [51 mm] ANSI Class 600 RF 16.59 421 84 38

2 in [51 mm] ANSI Class 600 RTJ 16.71 424 84 38

2 in [51 mm] ANSI Class 900 RF 18.81 478 112 51

2 in [51 mm] ANSI Class 900 RTJ 18.93 481 112 51

2 in [51 mm] ANSI Class 1,500 RF 18.81 478 112 51

2 in [51 mm] ANSI Class 1,500 RTJ 18.93 481 112 51

3 in [76 mm] ANSI Class 600 RF 17.31 440 100 46

3 in [76 mm] ANSI Class 600 RTJ 17.43 443 100 46

3 in [76 mm] ANSI Class 900 RF 18.81 478 122 56

3 in [76 mm] ANSI Class 900 RTJ 18.93 481 122 56

3 in [76 mm] ANSI Class 1,500 RF 20.00 483 160 73

3 in [76 mm] ANSI Class 1,500 RTJ 20.12 486 160 73

4 in [102 mm] ANSI Class 600 RF 18.81 478 138 63

4 in [102 mm] ANSI Class 600 RTJ 18.93 487 138 63

4 in [102 mm] ANSI Class 900 RF 19.80 503 166 76

4 in [102 mm] ANSI Class 900 RTJ 19.92 506 166 76

4 in [102 mm] ANSI Class 1,500 RF 20.50 521 202 92

4 in [102 mm] ANSI Class 1,500 RTJ 20.62 524 202 92

2⁄ in [52.4 mm] API 3,000 18.93 481 112 51

2⁄ in [52.4 mm] API 5,000 18.93 481 112 51

2⁄ in [65.09 mm] API 3,000 19.20 488 136 62

2⁄ in [65.09 mm] API 5,000 19.20 488 136 62

3⁄ in [79.4 mm] API 3,000 18.93 481 122 56

3⁄ in [79.4 mm] API 5,000 20.12 486 160 73

4⁄ in [103.2 mm] API 3,000 19.92 506 166 76

4⁄ in [103.2 mm] API 5,000 20.62 524 202 92

(2) 1 in (pie)

(2) ⁄ in

(2) ⁄ in

(2) ⁄ in

(1) ⁄ in

Degree open, °

50

40

30

20

10

0

0 10 20 30 40 50 60 70 80 90

90.0

68.0

45.0

32.0

23.0

MC20 flow curves

Cv

Bean size, ⁄ in

equivalent area

12

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.

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

M1A

M1A Choke Parts List

Key

no. Description Qty Standard material

1Outlet hub 1Ni-Al-Bz, alloy steel, or stainless steel

2 Capscrew 8 Alloy

3 O-ring†2Buna-N, Viton§ or aflas§

4 Carrier 1 Ni-Al-Bz, alloy steel, or stainless steel

5 Body 1 Ni-Al-Bz, alloy steel, or stainless steel

6 O-ring†1Buna-N, viton, or aflas

7Front disc†1Ceramic or tungsten carbide

8Thrust bearing†1 Delrin

9 O-ring 2 Buna-N, Viton, or aflas

10 Backup ring†1 Teflon

11 Turning fork 1Ni-Al-Bz or stainless steel

12 Indicator plate 1Stainless steel

13 Bar handle 1 Ni-Al-Bz

14 Plate screw 2Stainless steel

15 Stem screw 1Stainless steel

16 Back disc†1Ceramic or tungsten carbide

17 O-ring†1Buna-N, viton, or aflas

18 Backup ring†1 Teflon

19 Inlet hub 1Ni-Al-Bz, alloy steel, or stainless steel

20 Thumbscrew 1 Alloy steel

–Wear sleeve (optional) 1Tungsten carbide or stellite

† Recommended spare parts for one year of operation.

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

Flow coefficient Cv (maximum)†

(1) ⁄

(2) ⁄

(1) ¼

(2) ¼

(1) ½

(2) ½

(2) ⁄

0 5 10 15

Trim size

(number of holes)

diameter, in

20

15

10

4

8

13

14, 12

9

9

11

7

6

5

3

2

1

3

16

17

18

19

† 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.

0.67

0.33

1.54

3.12

5.71

11.20

14.50

13

M1A flow curves

M1A dimensions

M1A Physical Dimensions

Inlet and outlet connections A B Weight

in mm in mm lb kg

1 in [25 mm] Female NPT 8.11 206 6.00 152 28 13

2 in [51 mm] Female NPT 9.06 230 6.95 177 29 13

2 in [51 mm] Male NPT 8.11 206 6.00 152 28 13

2 in [51 mm] Butt Weld 8.00 203 5.89 150 28 13

2 in [51 mm] ANSI Class 600 RF 9.88 251 7.77 197 48 22

2 in [51 mm] ANSI Class 600 RTJ 9.94 252 7.83 199 48 22

2 in [51 mm] ANSI Class 900 RF 9.88 251 7.77 197 76 35

2 in [51 mm] ANSI Class 900 RTJ 9.94 252 7.83 199 76 35

2 in [51 mm] ANSI Class 1,500 RF 9.88 251 7.77 197 76 35

2 in [51 mm] ANSI Class 1,500 RTJ 9.94 252 7.83 199 76 35

2⁄ in [52.4 mm] 2,000 API 9.94 252 7.83 199 48 22

2⁄ in [52.4 mm] 3,000 API 9.94 252 7.83 199 76 35

2⁄ in [52.4 mm] 5,000 API 9.94 252 7.83 199 76 35

A 4.88

B

Degree open

15

10

5

0

0 10 20 30 40 50 60 70 80 90

56.4

45.3

32.0

22.6

(2) ⁄ in (pie)

(2) ⁄ in

(2) ⁄ in

(1) ⁄ in

Cv

Bean size, ⁄ in

equivalent area

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

M2 Choke Parts List

Key no. Description Qty Standard material

1 Body 1 Alloy steel

2 Disc assembly, back†1Ceramic/SS or tungsten carbide/SS

3O-ring, bonnet†1 Viton

4 Disc assembly, front†1Ceramic/SS or tungsten

carbide/SS

5Thrust bearing 1 Delrin†

6 O-ring, turning fork†1 Viton

7Backup ring†3 Teflon

8 Bonnet 1 Alloy steel

9Dowel pin†4High-strength alloy

10 Turning fork 1Alloy steel

11 Mounting flange 1Alloy steel

12 Calibration band†1Stainless steel

13 Sheet metal screw†4Alloy steel

14 Capscrew 1 Stainless steel

15 Stud 8 High-strength alloy

16 Nut 8 High-strength alloy

17 Pointer 1 Stainless steel

18 Shaft bushing 1 Turcite-A

19 O-ring, turning fork†2 Viton

20 O-ring, bonnet†1 Buna-N

21 O-ring, back

disc assembly†1 Viton

22 Indicat or head 1Alloy steel

23 Gear

operator, handwheel 1Alloy steel

24 Key 1 High-strength alloy

25 Drive shaft assembly 1Alloy steel

26 Capscrew 4 High-strength alloy

27 Mounting plate 1Alloy steel

28 Drive screw 4Stainless steel

29 Valve ID tag 1Stainless steel

† Recommended spare parts for one year of operation.

27

11 15

14

8

28, 29

20

10

4

21

2

1

13

17

12

16

19

3

5

18

23

22

13

24

25

26

9

7

6

M2 chokes, manually operated.

15

A

A

7.25

C

C

B

B

12

M2 trim

Dimensions

C Adj: HW Gear = 14.50 in

C Adj: Bar Handle = 7.48 in

C Positive = 5.00 in

M2 dimensions

M2 Choke Physical Dimensions

Inlet and outlet connections A B Weight

in mm in mm lb kg

2 in [51 mm] ANSI Class 600 RF 9.29 236 7.10 180 84 38

2 in [51 mm] ANSI Class 600 RTJ 9.35 237 7.16 182 84 38

2 in [51 mm] ANSI Class 900 RF 10.41 264 8.22 209 110 50

2 in [51 mm] ANSI Class 900 RTJ 10.47 266 8.28 210 110 50

2 in [51 mm] ANSI Class 1500 RF 10.41 264 8.22 208 110 50

2 in [51 mm] ANSI Class 1500 RTJ 10.47 265 8.28 210 110 50

2 in [51 mm] ANSI Class 2500 RF 11.38 289 9.19 233 144 65

2 in [51 mm] ANSI Class 2500 RTJ 11.44 291 9.25 235 144 65

2⁄ in [52.4 mm] 2,000 API 9.35 237 7.16 182 84 38

2⁄ in [52.4 mm] 3,000 API 10.47 266 8.28 210 110 50

2⁄ in [52.4 mm] 5,000 API 10.47 265 8.28 210 110 50

2⁄ in [65.09 mm] 2,000 API 9.60 244 7.41 188 90 41

2⁄ in [65.09 mm] 3,000 API 10.60 269 8.41 213 116 53

2⁄ in [65.09 mm] 5,000 API 10.57 269 8.38 213 116 53

3 in [76 mm] ANSI Class 600 RF 9.66 245 7.72 196 102 46

3 in [76 mm] ANSI Class 600 RTJ 9.72 247 7.78 197 102 46

3 in [76 mm] ANSI Class 900 RF 10.41 264 8.47 215 126 57

3 in [76 mm] ANSI Class 900 RTJ 10.47 266 8.53 216 126 57

3 in [76 mm] ANSI Class 1500 RF 11.00 280 9.06 230 156 71

3 in [76 mm] ANSI Class 1500 RTJ 11.06 281 9.12 232 156 71

3 in [76 mm] ANSI Class 2500 RF 13.00 330 11.06 281 204 93

3 in [76 mm] ANSI Class 2500 RTJ 13.12 333 11.18 284 204 93

3⁄ in [79.4 mm] 2,000 API 9.72 247 7.78 197 102 46

3⁄ in [79.4 mm] 3,000 API 10.47 266 8.53 216 126 57

3⁄ in [79.4 mm] 5,000 API 11.07 281 9.13 232 156 71

1⁄ in [42.9 mm] BX-150, 10,000 10.39 264 8.20 208 121 55

1⁄ in [46 mm] BX-151, 10,000 10.39 264 8.20 208 121 55

2⁄ in [52.4 mm] BX-152, 10,000 10.75 273 8.82 224 126 57

2⁄ in [65.09 mm] BX-153, 10,000 10.99 279 9.05 230 133 60

(2) ⁄ in

(1) ⁄ in

(1) ⁄ in

(2) ⁄ in

Degree open, °

40

30

20

10

0

0 10 20 30 40 50 60 70 80 90

90.0

68.0

45.0

32.0

23.0

(2) 1 in (pie)

(2) ⁄ in

(2) ⁄ in

(2) ⁄ in

† 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.

Body maximum pressure rating—API 10,000‡

Flow coefficient Cv (maximum)†

(1) ⁄

(2) ⁄

(1) ¼

(2) ¼

(1) ½

(2) ½

(2) ⁄

(2) ⁄

(2) ⁄

(2) 1

0.65

1.46

3.21

6.22

14.00

17.70 (special)

27.20

30.20 (special)

41.10

0 10 20 30 40

Trim size

(number of holes) diameter, in

0.33

M2 flow curves

Cv

Bean size, ⁄ in

equivalent area

16

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

M3 Choke Parts List

Key no. Description Qty Standard material

1 Body 1 Alloy steel

2 Outlet flange assembly 1Alloy steel

3 Front disc assembly†1Ceramic/SS or tungsten

carbide/SS

4 Back disc assembly†1Ceramic/SS or tungsten

carbide/SS

5Calibration band†1Stainless steel

6Turning fork 1Alloy steel

7 Bonnet 1 Alloy steel

8 Capscrew 8 Alloy

9 Capscrew 8 Alloy

10 Dowel pin†7Stainless steel

11 Gear

operator, handwheel 1Alloy steel

12 Thrust bearing 1 Delrin

13 Spacer ring 1Alloy steel

14 Gear operator adapter 1Alloy steel

15 Drive shaft assembly 1Alloy steel

16 Indicator head 1Alloy steel

17 Sheet metal screw†2Alloy steel

18 Capscrew 2 High-strength alloy

19 Capscrew 8 High-strength alloy

21 Shaft bushing 1 Turcite-a

22 Key 1 High strength alloy

24 O-ring, turning fork†1 Viton

25 O-ring, turning fork†2 Viton

26 O-ring, outlet spool†1 Viton

27 O-ring, outlet spool†2 Viton

28 O-ring, bonnet†1 Viton

29 O-ring, bonnet†1 Viton

30 O-ring, bonnet†1 Buna-N

31 O-ring, back

disc assembly†1 Viton

32 Backup ring†3 Teflon

33 Flat washer 2Alloy steel

34 Drive screw 4Stainless steel

35 Valve ID tag 1Stainless steel

† Recommended spare parts for one year of operation.

4

31

9

2

27

7

33, 18

17

13

5

10

34, 35

29

28

32, 24

12

6

3

10

16

11

22

15

19

8

21

1

26

25, 32

14

30

17

A

8

C

12

9

B

M3 trim

M3 dimensions

M3 Choke Physical Dimensions

Inlet and outlet connections A B Weight

in mm in mm lb kg

3⁄ in [79.4 mm] 2,000 API 12.66 321 8.47 215 137 62

3⁄ in [79.4 mm] 3,000 API 13.41 340 9.22 234 161 73

3⁄ in [79.4 mm] 5,000 API 14.01 354 9.82 249 193 88

3 in [76 mm] ANSI Class 600 RF 12.60 320 8.41 213 137 62

3 in [76 mm] ANSI Class 600 RTJ 12.66 322 8.48 215 137 62

3 in [76 mm] ANSI Class 900 RF 13.35 339 9.16 232 161 73

3 in [76 mm] ANSI Class 900 RTJ 13.41 341 9.22 234 161 73

3 in [76 mm] ANSI Class 1500 RF 13.94 354 9.75 248 193 88

3 in [76 mm] ANSI Class 1500 RTJ 14.00 355 9.81 249 193 88

3 in [76 mm] ANSI Class 2500 RF 15.94 404 11.75 298 286 130

3 in [76 mm] ANSI Class 2500 RTJ 16.05 407 11.87 301 286 130

4⁄ in [103 mm] 2,000 API 17.38 440 9.22 234 185 84

4⁄ in [103 mm] 3,000 API 17.88 453 9.72 246 205 93

4⁄ in [103 mm] 5,000 API 18.24 462 10.07 255 251 114

4 in [102 mm] ANSI Class 600 RF 17.32 439 9.16 232 185 84

4 in [102 mm] ANSI Class 600 RTJ 17.38 440 9.22 234 185 84

4 in [102 mm] ANSI Class 900 RF 17.82 452 9.66 245 205 93

4 in [102 mm] ANSI Class 900 RTJ 17.88 453 9.72 246 205 93

4 in [102 mm] ANSI Class 1500 RF 18.17 460 10.01 254 251 114

4 in [102 mm] ANSI Class 1500 RTJ 18.23 462 10.07 255 251 114

4 in [102 mm] ANSI Class 2500 RF 20.76 526 12.63 320 398 181

4 in [102 mm] ANSI Class 2500 RTJ 20.95 531 12.82 325 398 181

Dimensions

C Adj: HW Gear = 15.25 in

C Positive = 6.12 in

† 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.

Body maximum pressure rating—ANSI class 2500‡

Flow coefficient Cv (maximum)†

(1) ¼

(2) ¼

(1) ½

(2) ½

(2) ⁄

(2) 1

(2) 1⁄

(2) 1⁄

(2) 1.41

0 10 20 30 40 50 60 70 80 90

Trim size

(number of holes) diameter, in

3.33

6.85

14.00

29.90

48.80

68.50

77.50

87.90

1.60

Degree open, °

80

60

40

20

0

0 10 20 30 40 50 60 70 80 90

124.0

116.7

107.8

90.6

68.0

(2)

1⁄ in (pie)

(2) 1.41 in (pie)

(2) 1⁄ in

(2) 1 in

(2) ⁄ in

Bean size, ⁄ in

M3 flow curves

Cv

Bean size, ⁄ in

equivalent area

18

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.

M3G Choke Parts List

Key

no. Description Qty Standard material Key

no. Description Qty Standard material

1 Body 1 Alloy steel 19 O-ring, outlet spool†1 Viton

2 Outlet flange assembly 1Alloy steel 20 O-ring, bonnet†1 Buna-N

3 Back disc assembly†1Ceramic/SS or tungsten carbide/SS 21 Backup ring†3 Teflon

4 Front disc assembly†1Ceramic/SS or tungsten carbide/SS 27 Gear operator, handwheel 1Alloy steel

5Calibration band 1Stainless steel 28 Adapter for gear assembly 1Alloy steel

6Turning fork 1Alloy steel 29 Drive shaft assembly 1Alloy steel

7 Bonnet 1 Alloy steel 30 Capscrew 2 High-strength alloy

8 Capscrew 12 Alloy 31 Capscrew 4 High-strength alloy

9 Capscrew 16 Alloy 32 Capscrew 6 High-strength alloy

11 Sheet metal screw†2Stainless steel 33 Key 1 High-strength alloy

12 Thrust bearing 1 Delrin 36 Indicator head 1Alloy steel

13 Shaft bushing 1 Turcite-a 37 Spacer ring 1Alloy steel

14 O-ring, turning fork†2 Viton 38 Dowel pin†7Stainless steel

15 O-ring, turning fork†1 Viton 39 Flat washer 2Alloy steel

16 O-ring, bonnet†1 Viton 40 Drive screw 4Stainless steel

17 O-ring, bonnet†1 Viton 41 Valve ID tag 1Stainless steel

18 O-ring, back disc assembly†1 Viton

† Recommended spare parts for one year of operation.

M3G trim

M3G

28

7

38

37

16

6

4

18

9

2

1

31

32

20

17

40, 41

12

19

38

27

36

33

29

8

13

14, 21

15, 21

3

38

11

5

30, 39

† 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.

Body maximum pressure rating—psi API 10,000‡

Flow coefficient Cv (maximum)†

(1) ¼

(2) ¼

(1) ½

(2) ½

(2) ⁄

(2) 1

(2) 1⁄

(2) 1⁄

(2) 1.41

0 10 20 30 40 50 60 70 80 90

Trim size

(number of holes) diameter, in

3.33

6.85

14.00

29.90

48.80

68.50

77.50

87.90

1.60

19

M3G dimensions

M3G Choke Physical Dimensions

Inlet connections Outlet connections A B Weight

in mm in mm lb kg

3 in [76 mm] ANSI 600 RF 4 in [102 mm] ANSI 600 RF 14.22 361 8.41 213 197 90

3 in [76 mm] ANSI 600 RTJ 4 in [102 mm] ANSI 600 RTJ 14.28 362 8.47 215 197 90

3 in [76 mm] ANSI 900 RF 4 in [102 mm] ANSI 900 RF 14.72 373 9.16 231 215 98

3 in [76 mm] ANSI 900 RTJ 4 in [102 mm] ANSI 900 RTJ 14.78 375 9.22 234 215 98

3 in [76 mm] ANSI 1500 RF 4 in [102 mm] ANSI 1500 RF 15.07 382 9.75 248 253 115

3 in [76 mm] ANSI 1500 RTJ 4 in [102 mm] ANSI 1500 RTJ 15.13 384 9.81 249 253 115

3 in [76 mm] ANSI 2500 RF 4 in [102 mm] ANSI 2500 RF 17.72 449 11.75 298 372 169

3 in [76 mm] ANSI 2500 RTJ 4 in [102 mm] ANSI 2500 RTJ 17.91 453 11.87 301 372 169

3⁄ in [79.4 mm] API 2,000 4⁄ in [103 mm] API 2,000 14.28 362 8.47 215 197 90

3⁄ in [79.4 mm] API 3,000 4⁄ in [103 mm] API 3,000 14.78 375 9.22 234 215 98

3⁄ in [79.4 mm] API 5,000 4⁄ in [103 mm] API 5,000 15.13 384 9.82 248 253 115

4 in [102 mm] ANSI 600 RF 6 in [152 mm] ANSI 600 RF 20.27 515 9.16 232 267 121

4 in [102 mm] ANSI 600 RTJ 6 in [152 mm] ANSI 600 RTJ 20.33 516 9.22 234 267 121

4 in [102 mm] ANSI 900 RF 6 in [152 mm] ANSI 900 RF 21.16 537 9.66 245 305 139

4 in [102 mm] ANSI 900 RTJ 6 in [152 mm] ANSI 900 RTJ 21.22 538 9.72 246 305 139

4 in [102 mm] ANSI 1,500 RF 6 in [152 mm] ANSI 1,500 RF 22.38 567 10.01 254 386 175

4 in [102 mm] ANSI 1500 RTJ 6 in [152 mm] ANSI 1500 RTJ 22.50 570 10.07 256 386 175

4 in [102 mm] ANSI 2500 RF 6 in [152 mm] ANSI 2500 RF 26.38 668 12.63 320 675 307

4 in [102 mm] ANSI 2500 RTJ 6 in [152 mm] ANSI 2500 RTJ 26.63 674 12.82 325 675 307

4⁄ in [103 mm] API 2,000 7⁄ in [179 mm] API 2,000 20.32 517 9.22 234 267 121

4⁄ in [103 mm] API 3,000 7⁄ in [179 mm] API 3,000 21.19 538 9.72 246 305 139

4⁄ in [103 mm] API 5,000 7⁄ in [179 mm] API 5,000 22.51 570 10.07 256 386 175

2⁄ in [65 mm] BX-153 10K 3⁄ in [78 mm] BX-154 10K 15.41 391 10.56 268 226 103

3⁄ in [78 mm] BX-154 10K 3⁄ in [78 mm] BX-154 10K 15.41 391 11.18 284 291 132

4⁄ in [103 mm] BX-155 10K 4⁄ in [103 mm] BX-155 10K 16.88 429 11.94 303 444 202

A

8

C

12

9

B

Dimensions

C Adj: HW Gear = 15.25 in

C Positive = 6.12 in

Degree open, °

80

60

40

20

0

0 10 20 30 40 50 60 70 80 90

124.0

116.7

107.8

90.6

68.0

(2)

1⁄ in (pie)

(2)

1⁄ in

(2) 1.41 in (pie)

(2) 1 in

(2) ⁄ in

Bean size, ⁄ in

M3G flow curves

Cv

Bean size, ⁄ in

equivalent area

20

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.

M4

M3 Choke Parts List

Key no. Description Qty Standard material

1 Body 1 Alloy steel

2 Outlet flange assembly 1Alloy steel

3 Front disc assembly†1Ceramic/SS or

tungsten carbide/SS

4 Back disc assembly†1Ceramic/SS or

tungsten carbide/SS

5Calibration band 1Stainless steel

6Turning fork 1Alloy steel

7 Bonnet 1 Alloy steel

8 Capscrew 12 Alloy

9 Capscrew 12 Alloy

10 Dowel pin†6Stainless steel

11 Bearing race 1Alloy steel

12 Thrust needle bearing 1Alloy steel

13 Thrust bearing race 1Alloy steel

14 O-ring, outlet spool†1 Viton

15 Backup ring,

outlet spool†1 Teflon

16 O-ring, outlet spool†1 Viton

17 O-ring, back

disc assembly†1 Viton

18 O-ring, bonnet†1 Viton

19 Backup ring†2 Teflon

20 O-ring, bonnet 1 Viton

21 O-ring, turning fork†1 Viton

22 Backup ring†3 Teflon

23 O-ring, turning fork†2 Viton

24 Key 1 High-strength alloy

25 Sheet metal screw 2Stainless steel

26 Gear

operator, handwheel 1Alloy steel

27 Adapter for

gear assembly 1Alloy steel

28 Spacer ring 1Alloy steel

29 Drive bushing 1Alloy steel

30 Indicator head 1Stainless steel

31 Capscrew 2 High-strength alloy

32 Nut 4 High-strength alloy

33 Stud 4 High-strength alloy

34 Key 1 High-strength alloy

35 Key retainer plug 1Alloy steel

36 Capscrew 4 High-strength alloy

37 Drive screw 4Stainless steel

38 Valve ID tag 1Stainless steel

† Recommended spare parts for one year of operation.

35

5

26

29

24

32, 33

27

8

7

10

19, 20

37, 38

6

3

1

4

10

9

2

18,19

22, 23

21, 22

52

17

34

36

30

25

11

15, 16

14

22, 23

28

13

12

31

21

A 20.50

12.25

18

13.50

B

M4 trim

M4 dimensions

M4 Physical Dimensions

Inlet and outlet connections A ± .12 in B ± .12 in Weight

in mm in mm lb kg

4 in [102 mm] ANSI Class 600 RF 17.22 437 12.34 313 403 183

4 in [102 mm] ANSI Class 600 RTJ 17.28 438 12.40 315 403 183

4 in [102 mm] ANSI Class 900 RF 17.72 450 12.81 326 425 193

4 in [102 mm] ANSI Class 900 RTJ 17.78 451 12.87 327 425 193

4 in [102 mm] ANSI Class 1500 RF 18.07 458 13.19 335 469 213

4 in [102 mm] ANSI Class 1500 RTJ 18.13 460 13.25 336 469 213

4 in [102 mm] ANSI Class 2500 RF 20.69 525 15.81 401 685 311

4 in [102 mm] ANSI Class 2500 RTJ 20.88 530 16.00 406 685 311

4⁄ in [103 mm] API 2,000 17.28 438 12.40 315 403 183

4⁄ in [103 mm] API 3,000 17.78 451 12.90 327 425 193

4⁄ in [103 mm] API 5,000 18.13 460 13.25 336 539 245

6 in [152 mm] ANSI Class 600 RF 23.28 591 18.40 467 414 188

6 in [152 mm] ANSI Class 600 RTJ 23.34 593 18.46 469 414 188

6 in [152 mm] ANSI Class 900 RF 24.16 613 19.28 489 445 202

6 in [152 mm] ANSI Class 900 RTJ 24.22 615 19.34 491 445 202

6 in [152 mm] ANSI Class 1500 RF 25.38 643 20.50 519 504 229

6 in [152 mm] ANSI Class 1500 RTJ 25.51 646 20.62 523 504 229

6 in [152 mm] ANSI Class 2500 RF 29.38 744 24.50 620 790 359

6 in [152 mm] ANSI Class 2500 RTJ 29.63 750 24.75 627 790 359

7⁄ in [179 mm] API 2,000 23.35 593 18.47 469 414 188

7⁄ in [179 mm] API 3,000 24.22 615 19.34 491 445 202

† 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.

Body maximum pressure rating—ANSI class 2500‡

Flow coefficient Cv (maximum)†

(1) ½

(2) ½

(2) ⁄

(2) 1

(2) 1⁄

(2) 1⁄

(2) 2

(2) 2⁄

0 50 100 150 200

Trim size

(number of holes) diameter, in

200

150

100

50

0

(2)

1.00 in

Degree open, °

0 10 20 30 40 50 60 70 80 90

214.6

181.2

136.0

107.8

90.6

68.0

(2) 2⁄ in (pie) (2) 2.00 in

(2) 1.50 in

(2) 1⁄ in

(2) ⁄ in

14.00

29.90

57.20

87.80

130.00

188.0

224.0

6.85

M4 flow curves

Cv

Bean size, ⁄ in

equivalent area

Dimensions

C Adj: HW Gear = 20.50 in

C Positive = 6.25 in

22

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

M6 Choke Parts List

Key no. Description Qty Standard material

1 Body 1 Alloy steel

2 Outlet flange assembly 1Alloy steel

3 Front disc assembly†1Ceramic/SS or

tungsten carbide/SS

4 Back disc assembly†1Ceramic/SS or

tungsten carbide/SS

5Calibration band 1Stainless steel

6Turning fork 1Alloy steel

7 Bonnet 1 Alloy steel

8 Capscrew 16 Alloy

9 Capscrew 16 Alloy

10 Dowel pin†6Stainless steel

11 Sheet metal screw 2Stainless steel

12 Thrust needle bearing 1Alloy steel

13 Thrust bearing race 2Alloy steel

14 O-ring, outlet spool†1 Viton

15 O-ring, outlet spool†1 Viton

17 O-ring, back

disc assembly†1 Viton

18 O-ring, bonnet†1 Viton

20 O-ring, bonnet†1 Viton

21 O-ring, turning fork†1 Viton

22 Backup ring†3 Teflon

23 O-ring, turning fork†2 Viton

24 Key 1 High-strength alloy

27 Gear

operator, handwheel 1Alloy steel

28 Indicator head 1Alloy steel

29 Capscrew 2 Stainless steel

30 Spacer ring 1Alloy steel

31 Gear operator adapter 1Alloy steel

32 Drive bushing 1Alloy steel

33 Key 1 High-strength alloy

34 Pointer 1 Stainless steel

35 Pointer riser 1Alloy steel

36 Capscrew 4 High-strength alloy

37 Stud 8 High-strength alloy

38 Nut 8 High-strength alloy

39 Set screw 1High-strength alloy

40 Capscrew 4 High-strength alloy

41 Key retainer plug 1Alloy steel

42 Flow direction label 1Stainless steel

43 Drive screw 6Stainless steel

44 Valve ID Tag 1Stainless Steel

† Recommended spare parts for one year of operation.

34

35

29

33

24

39

8

10

12, 13

20

18

43, 44

7

6

1

3

4

10

42, 43

9

2

41

27

40

28

1

5

32

37, 38

31

30

22, 23

21, 22

17

15

14

36

23

A C

12.25

18

13.75

B

M6 trim

M6 dimensions

M6 Choke Physical Dimensions

Inlet and outlet connections A ± .12 in B ± .12 in Weight

in mm in mm lb kg

6 in [152 mm] ANSI Class 600 RF 26.31 669 15.31 389 826 375

6 in [152 mm] ANSI Class 600 RTJ 26.37 670 15.37 391 826 375

6 in [152 mm] ANSI Class 900 RF 27.19 691 16.19 411 880 400

6 in [152 mm] ANSI Class 900 RTJ 27.25 692 16.25 413 880 400

6 in [152 mm] ANSI Class 1500 RF 28.44 721 17.44 442 939 427

6 in [152 mm] ANSI Class 1500 RTJ 28.57 724 17.57 445 939 427

7⁄ in [179 mm] API 3,000 27.25 692 16.25 413 880 400

8 in [203 mm ] ANSI Class 600 RF 32.88 835 21.88 555 934 425

8 in [203 mm ] ANSI Class 600 RTJ 32.94 836 21.94 557 934 425

8 in [203 mm ] ANSI Class 900 RF 34.01 863 23.03 584 1086 494

8 in [203 mm ] ANSI Class 900 RTJ 34.07 865 23.07 586 1086 494

8 in [203 mm ] ANSI Class 1500 RF 36.01 912 25.01 632 1258 572

8 in [203 mm ] ANSI Class 1500 RTJ 36.20 916 25.20 637 1258 572

Dimension

C Adj: HW Gear = 22.50 in

† 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.

Body maximum pressure rating—ANSI class 1500‡

Flow coefficient Cv (maximum)†

(2) ⁄

(2) 1

(2) 1⁄

(2) 1⁄

(2) 2

(2) 2⁄

(2) 3⁄

Trim size

(number of holes) diameter, in

0 10 20 30 40 50 60 70 80 90

57.20

87.80

130.00

188.00

235.00

435.00

29.90

Cv

400

300

200

100

20

Degree open, °

0 10 20 30 40 50 60 70 80 90

283.0

214.6

181.3

136.0

(2) 3⁄ in (pie)

(2) 2⁄ in (pie)

(2) 2.00 in

(2) 1.5 in

M6 flow curves Bean size, ⁄ in

equivalent area

24

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 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.

In-line Positive Choke

Size Standard connections Max. CWP Max. bean Bean material

2 in [51 mm]

1 in [25 mm] or 2 in [51 mm]

1-in female threaded

2-in male threaded

buttweld

5,000 psi 74 /64s Either stainless steel or

tungsten carbide come

in sizes up to 66/ 64s.

All larger orifice sizes come

in stainless steel.

3 in [76 mm] 3-in buttweld 6,000 psi 128 /64s

4 in [102 mm] 4-in buttweld 5,000 psi 176 /64s

M2 Positive Choke Parts List

Key no. Description Quantity

1 Body 1

2 Bonnet 1

3 Seat†1

4Bean insert†1

5O-ring, seat†1

6O-ring, bean†1

7O-ring, bonnet†1

8O-ring, bonnet†1

9O-ring, bonnet†1

† Recommended spare parts for one year of operation.

MOV Positive Chokes

2

9

873

1 5 4

6

25

M3 Positive Choke Parts List

Key no. Description Quantity

1 Capscrew 16

2 Outlet flange assembly 1

3Dowel pins†3

4O-ring, outlet spool

and bonnet†4

5 O-ring, bean carrier†1

6Bean carrier†1

7Bean insert†1

8O-ring, bean†1

9Retainer plate 1

10 Retainer post 2

12 Body 1

13 Bonnet 1

† Recommended spare parts for one year of operation.

M4 Positive Choke Parts List

Key no. Description Quantity

1 Capscrew 24

2 Outlet flange assembly 1

3Dowel pins†3

4 O-ring, outlet spool†1

5 O-ring, bean carrier†1

6Bean carrier†1

7Bean assembly†1

8O-ring, bean†1

9Retainer plate 1

10 Retainer post 2

11 O-ring, outlet spool†1

12 Body 1

13 Bonnet 1

14 O-ring, bonnet†1

15 O-ring, bonnet†1

† Recommended spare parts for one year of operation.

MOV Positive Bean

Valve type Available positive bean

sizes, in

Bean material

M2 ⁄ to ⁄ Either stainless steel or

tungsten carbide come

in sizes up to ⁄s. All

larger orifice sizes come in

stainless steel.

M3 ⁄ to ⁄

M3G ⁄ to ⁄

M4 ⁄ to ⁄

M6 ⁄ to ⁄

1

1

13

13

21 410

10

129

21

8765

87

3

6

4

3

3

51143

1415

12 9

26

MOV Trim Selection, Flow Coefficient Cv (Maximum)‡

Valve

type

Body maximum

pressure rating, psi†

Trim size (number of holes, diameter)

1, ⁄ 2, ⁄ 1, ⁄ 2, ⁄ 1, ⁄ 2, ⁄ 2, ⁄ 2, ⁄ 2, ⁄ 2, 1 2, 1⁄ 2, 1⁄ 2, 1.41 2, 1⁄ 2, 2 2, 2⁄ 2, 3⁄

MC20 API 5,000 – – – 2.98 6.22 13.73 – 32.30 – 56.60 – 77.10 – – – – –

MIA API 5,000 0.33 0.67 1.54 3.12 5.71 11.20 14.50§––––––––––

MC10 ANSI Class 1500 0.33 0.70 1.60 3.33 6.85 13.50 19.60§––––––––––

M2 API 10,000 – 0.65 1.46 3.21 6.22 14.00 17.70 27.20 30.20 36.10§–––––––

M3 API 6,250 – – 1.60 3.33 6.85 14.00 17.70 29.90 – 48.80 68.50 77.50§87.90§––––

M3G API 10,000 – – 1.60 3.33 6.85 14.00 17.70 29.90 – 48.80 68.50 77.50§87.90§––––

M4 API 6,250 – – – – 6.85 14.00 17.70 29.90 – 57.20 87.80 – – 130.00 188.00 218.00§–

M6 API 3,750 – – – – – – – 29.90 – 57.20 87.80 – – 130.00 188.00 235.00§435.00

† 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.

Technical reference

Cameron Body Material Chart (Subject to change per Q.A./Engineering Evaluation)

Style 0 Style 8 Style 4

Service

temperature range,

degF [degC]

Standard service

ASTM API Type: 1,2,3

HS

NACE MR-01-75

CO with or without HS

Sea water HCI environmentPartial pressure, psi

0–3 (3–30) 30+

−50 to 230 degF

[−46 to 110 degC]

Style C

A350 LF2 8620

8720

4130

A352LCB/LCC†

A350 LF2†

8620

8720

4130†

8620

8720

4130

A350 LF2†

A182 F6NM

A487 CA6NM

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

8620

8720

4130

Hastelloy C276

Inconel 625

Alloy 20

Duplex§

−20 to 230 degF

[−29 to 110 degC]

A 487 4N

A105

A216 WCB

8620

8720

4130

A 487 4N†

A105

AA352LCC

A352LCB

8620

8720

4130

8620

8720

4130

A105†

410 SS

A182 F6a

A217 CA15

Inconel 625

Inconel 600

Incoloy 825

Alloy 20

Duplex§

316*

410 SS

Inconel 625

Inconel 600

Incoloy 825

Alloy 20

Duplex§

316

8620

8720

4130

NAIA Bronze‡

Hastelloy C276

Inconel 625

Alloy 20

Duplex§

−20 to 350 degF

[−29 to 110 degC]

A105

A216 WCB

8620

8720

4130

A105†

8620

8720

4130

8620

8720

4130

A105†

410 SS

A182 F6a

A217 CA15

Inconel 625

Inconel 600

Incoloy 825

Alloy 20

Duplex§

316‡

410 SS

Inconel 625

Inconel 600

Incoloy 825

Alloy 20

Duplex§

316

8620

8720

4130

NAIA Bronze‡

Hastelloy C276

Inconel 625

Alloy 20

Duplex§

† Additional requirement: Hardness HRC22 max. as heat-treated seawater without HS.

‡ 316 SS for high CO plus chloride.

§ Ferralium 255 or Sandvik 2205.

†† Includes Charpy impact testing for Style C.

Equivalent regarding corrosive resistance.

††

†

†

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