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Master Flo Valve Inc. ON THE LEADING EDGE OF TECHNOLOGY!!!
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Master Flo Valve Inc.'s corporate head office in Edmonton,
Alberta, Canada is a custom designed surface and subsea choke assembly,
design, and testing facility. Our large engineering group is specifically
directed at the development of subsea and surface production chokes. This
45,000 square-foot facility is located on four acres of land. |
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Master Flo Valve Inc. is a dedicated choke valve and
critical service control valve manufacturing company. Since our inception in
1979, we have focused on the supply of quality, reliable, high performance
valves for the oil and gas industry. This has been achieved with our patented
external sleeve design cage choke which was introduced in 1981. |
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Master Flo Valve Inc. incorporated this revolutionary
technology into conventional oil and gas and related choke applications in
1983. The product line was fully developed to include actuation and our own
metal-to-metal seal technology. Master Flo utilizes this combined technology
to provide a proven valve/actuator package for subsea applications. The
subsea product introduced in 1991 benefits from utilizing the standard,
proven flow trim technology of our surface choke product line. |
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Master Flo's surface chokes are available in sizes
from 1/2" to 8" and up to 20,000 PSI. Master Flo has developed
pneumatic and hydraulic actuators in both piston and stepping designs to meet
the varied actuation requirements. |
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Master Flo continues to develop state of the art
technology with our complete metal-to-metal seals both for static and dynamic
applications. |
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Our subsea division has developed complete manual and
automated subsea choke packages that include: |
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Master Flo's subsea chokes are developed to operate at service depths of up to 18,000' of water. Master Flo Valve Inc. manufactures to API 6A under License Number 6A-0138 up to PSL 4, API 17D License Number 17D-0008, and in accordance to ISO 9001-94-74 registered with Quality Certification Bureau Inc. Master Flo Valve Co. (UK) Ltd. in accordance to ISO 9002:1994. Master Flo offers technical support and service throughout the world. |
Master
Flo Choke Valve Design
Flow Trim (External Sliding Sleeve and Internal Cage):
The choke valve system is based on a fixed radially ported internal nozzle (flow nozzle) with an external sliding sleeve (flow ring). The sleeve overlaps the nozzle ports to vary the flow.
Shutoff is accomplished by an independent seating area upstream and remote from the throttling area. The choke incorporates a dead band area to isolate the seating from the flow area. This isolates the seat from the throttling surface.
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Wear Performance: The external sleeve choke configuration has proven to provide superior wear control over other choke trim styles. The Master Flo choke controls high velocity flow jets during throttling by directing the flow upwards into the flow ring thereby containing the erosive energy within the flow trim. This phenomenon is due to the external flow ring internal nozzle design. This system is unique in protecting the valve body from high velocity fluid impingement. The potential wear is contained to the replaceable flow trim components, and this in turn reduces the need for an outlet blast wear sleeve as commonly seen with other trim configurations. |
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Flow Control:
The staged ports within the flow nozzle are positioned radially and orthogonal (one pair to the other) to prevent failure of flow nozzle due to erosive linking of throttling ports and to provide precise flow control.
The use of only two sets of ports in the flow nozzle provides a long stem travel thus ensuring precise flow control throughout the range.
The staged port system provides control from a Cv below 0.1 up to the valve's maximum. This high turn-down ratio and control eliminates the necessity of multiple trim sizes.
Micrometer Indicator Head:
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Master Flo manually operated chokes are supplied with an
indicator head having a micrometer calibration scale* that provides positive,
repeatable valve position indication to 1/10 of a turn increments.
This, together with the inherent controllability of the Master Flo trim
design, results in excellent throttling control. |
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The indicator head has a square cross-section with a different calibration scale on each face. This ensures that the valve position can be monitored in the desired units including Cv, bean size, millimeters, or the micrometer scale.
For P2 and larger chokes, the indicator head is supplied with a grease fitting to allow lubrication of the upper stem area.
*Micrometer scale is standard on P5 and smaller, and optional on P6 and larger.
Stem Lock Assembly:
Master Flo's optional stem lock for manually operated chokes allows the stem to be locked in 10 positions per turn of the handwheel. This provides a large number of fixed valve positions between the closed and full open position.
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Valve Model |
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Locking Positions |
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P2 |
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110 |
Seat Leakage:
Master Flo choke valves attain Class V or, optionally, Class VI shutoff per ANSI B16.104 1976 (FCI 70-2). Seating integrity is maintained throughout the service life of the flow trim.
Flow Trim Construction/Retention:
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Flow trim components are available in solid 17-4 PH stainless steel, or in Stellite, or Tungsten Carbide held in stainless steel carriers with interference fits. No epoxies, brazing, or threaded fasteners are used to retain components in their carriers. The flow nozzle and seat are retained in the valve body by use of a retaining sleeve that is compressed against the seat by the valve bonnet. The retaining sleeve also protects the valve body cavity against erosion. No special tooling is required for maintenance or service. |
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Master Flo Sizing/Flow Test Data:
The choke sizing data is based on ISA S75.01 and verified by actual flow tests conducted on an in-house flow test loop per ISA S75.02.
Quality Assurance/Certification:
Master Flo Valve Inc. maintains an accredited quality program in accordance to ISO 9001-94 and API Q1. Master Flo Valve Canada is registered for the manufacture of choke valves and is approved to manufacture products under license to API-6A and API-17D.
Master Flo Valve (UK) operates under Quality Management System to BS 5750 Part II / ISO 9002 accredited by Bureau Veritas.
Valve Sizes
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Valve Model |
Std. End Connection Sizes |
Standard Trim |
Maximum Pressure Rating |
Maximum Turning Torque at 3,000 PSI |
# Turns Close to Open |
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Cv |
Bean Size |
PSI |
kPa |
ft-lb |
Nm |
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P05 |
1", 2" |
2.5 |
24 |
10,000 |
69 000 |
10 |
15 |
6 |
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P1 |
1", 2" |
10 |
48 |
6,000 |
41 000 |
35 |
46 |
6 |
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P2 |
2", 3" |
20 |
72 |
10,000 |
69 000 |
60 |
83 |
11 |
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P25 |
2",2-1/2",3" |
33 |
93 |
5,000 |
34 000 |
60 |
83 |
12 |
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15,000 |
103 000 |
70 |
92 |
9 |
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20,000 |
138 000 |
70 |
92 |
9 |
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P3 |
3", 4" |
50 |
116 |
6,000 |
41 000 |
45 |
62 |
17 |
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10,000 |
69 000 |
45 |
62 |
17 |
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15,000 |
103 000 |
70 |
92 |
13 |
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P35 |
4", 6" |
100 |
160 |
6,000 |
41 000 |
70 |
92 |
16 |
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15,000 |
103 000 |
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P4 |
4", 6" |
160 |
198 |
6,000 |
41 000 |
96 |
130 |
20 |
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10,000 |
69 000 |
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P5 |
5", 6", 8" |
250 |
240 |
6,000 |
41 000 |
81 |
110 |
22-1/2 |
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10,000 |
69 000 |
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P6 |
6", 8" |
335 |
280 |
6,000 |
41 000 |
81 |
110 |
27 |
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P8 |
8", 10" |
700 |
450 |
6,000 |
41 000 |
96 |
130 |
33-1/2 |
Other sizes and pressure ratings are available upon approval by Master Flo's engineering department.
Master Flo sizing is available upon request to ensure accurate valve selection to meet your specific needs.
Choke Parts Lists
(Generic Bill of Materials)
P2
* Parts included in seal replacement kit. |
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Metal-to-Metal Stem Seals
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Master Flo's Metal Stem Seal is a mechanical and pressure energized sliding metal-to-metal seal requiring no elastomers for the sealing function. This seal system has been fully performance verified by an independent testing facility. Master Flo Valve has tested this seal to over ten (10) times the requirements of API 6A PR 2 Appendix F testing criteria, far exceeding all requirements for a seal of this type. |
Dimensions
Choke valve inlet
and outlet dimensions are not regulated by any industry standards.
Master Flo's inlet
(I) and outlet (O) dimensions are one of the most compact in the industry
today. This ensures the most
compact overall envelope and allows for our product to be adapted to specific
customer dimensional requirements ensuring the optimum in design and
interchangeability for replacement units.
Master Flo standard
dimensions are available upon request. Below is a drawing showing how to
measure the dimensions. For special dimensions, please supply the required I
& O dimensions together with details of your requirements. We would be
pleased to offer pricing and/or further details to meet your needs.
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3” 900 RTJ P2 Dimensions ‘I’ & ‘O’ = 8.81 A = 13.00 B = 18.00 C = 19.00 |
Multistage Trim
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Master Flo has available multistage trim for high pressure drop liquid service applications to address cavitation concerns. Master Flo’s multistage trim is designed to eliminate cavitation for pressure drops of up to 3,500 PSI to atmosphere. Shut-off is designed to be maintained due to the isolated seat feature. |
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High Temperature Chokes and Valves
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Master Flo manufactures high temperature models of the choke and control valve. Temperature rating is up to 850°F with pressures to 3,600 PSI ensures suitability for steam and other high temperature applications. This valve style is available on P1 through P25 valve models. |
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Typical Non-wellhead Choke Applications
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Blow Down |
- Separator blow downs |
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Vent Valves |
Vent valves to flare |
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Level controllers |
High pressure drop level controllers, or high abrasive
applications |
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Gas Lift |
Chokes used to control injection volumes |
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Water Injection |
Injection chokes, as well as multistage trims used for the
recycle lines on the pumps. |
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Water Injection Recycle Lines |
High pressure drop liquid recycle lines with Master Flo’s multistage
trim. |
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Overboard Dumps |
Water injection systems. |
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Dump Valves |
- Glycol knock out drums |
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Glycol Injection |
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Well Cleanup |
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