Masoneilan 39004 High-Performance Butterfly Control Valve (9004 Series)
Overview: Precision Throttling Beyond the Conventional Butterfly Valve
The Masoneilan 39004 Series High-Performance Butterfly Valve (HPBV) is a heavy-duty, automatic throttling control valve engineered to outperform conventional swing-through butterfly valve designs in both sealing method and operational characteristics. Two features define the HPBV category and distinguish the 39004 from a standard butterfly valve: a PTFE, RTFE, or metal seal ring in place of a simple elastomeric liner, and the use of double offset (eccentric) disc operation rather than a centered, swing-through disc.
As an authorized supplier of Masoneilan control valves, Seven Star LLC sources and supplies the 39004 Series high-performance butterfly valve to refineries, gas processing plants, and petrochemical facilities across Oman and the wider GCC. Because HPBV technology delivers meaningfully better control performance and seal life than conventional butterfly valves at a similar cost point, Seven Star LLC helps engineering teams specify the correct 39004 configuration for demanding throttling applications.
Working Principle: Double Eccentric Disc Geometry
The double offset (double eccentric) disc design positions the disc’s pivot axis offset from both the pipe centerline and the seat plane, so that as the disc rotates open, it lifts away from the seat immediately rather than dragging or rubbing across it as a conventional centered-disc butterfly valve would. This near-frictionless opening and closing action is what gives the double eccentric geometry its low operating torque, and it is also what protects the seal ring from the abrasive wear that shortens conventional butterfly valve seal life.
The seal itself is a double eccentric TFE, RTFE, or flexible metal ring rather than a molded elastomeric liner, offering either Class IV (metal seat) or Class VI (PTFE/RTFE soft seat) shut-off performance depending on the selected trim. Combined with an inherent equal-percentage flow characteristic, this seal and disc geometry gives the 39004 accurate, repeatable throttling control across its travel range, not just tight shut-off at the fully closed position.
Engineering Design of the 39004 Series
The 39004 is available in sizes from 3 inches through 48 inches (80 through 1200 mm), in wafer or lug body styles for mounting between ANSI Class 150 through Class 600 flanges, with carbon steel or stainless steel body material options to suit a range of process media and pressure-temperature conditions. The low-torque, double offset disc reduces the actuator sizing requirement compared to a conventional butterfly valve of the same size, translating into smaller, more economical actuator selection for a given torque requirement.
Actuation options include the Masoneilan Model 96/97 pneumatic rack-and-pinion actuator or the Model 34 Scotch yoke cylinder actuator, both purpose-matched to the valve’s torque and stroke requirements. This combination of proven actuator platforms and the HPBV’s inherently lower operating torque supports reliable automated throttling control across the valve’s full size range.
Key Features
The Masoneilan 39004 High-Performance Butterfly Valve delivers precise throttling control with reduced maintenance. Key characteristics include:
- Double eccentric (double offset) disc geometry for low torque and reduced seal wear.
- PTFE, RTFE, or flexible metal seal ring options for Class IV or Class VI shut-off.
- Sizes from 3 inches to 48 inches (80 to 1200 mm).
- Wafer and lug body styles for ANSI Class 150 to Class 600 flange mounting.
- Carbon steel or stainless steel body material options.
- Inherent equal-percentage flow characteristic for accurate throttling control.
- Compatible with Model 96/97 rack-and-pinion or Model 34 Scotch yoke pneumatic actuators.
Industrial Applications
The 39004 Series is deployed across refinery process units, gas processing plants, and petrochemical facilities wherever large-diameter throttling control is required with better control accuracy and lower maintenance than a conventional butterfly valve can provide. Its low operating torque and reduced seal wear make it particularly cost-effective on large-diameter lines where actuator sizing and seal replacement frequency directly affect project lifecycle cost.
Seven Star LLC supports refinery engineering teams, gas processing operators, and petrochemical maintenance departments across Oman, Muscat, Sohar, and the broader GCC region with sourcing of Masoneilan 39004 high-performance butterfly valves, helping projects achieve reliable, low-maintenance large-diameter flow control.
Technical Specifications
The table below summarizes the core specifications of the Masoneilan 39004 High-Performance Butterfly Valve as supplied by Seven Star LLC.
| Parameter | Specification |
|---|---|
| Model | Masoneilan 39004 Series (9004) |
| Type | High-performance butterfly valve (HPBV), double eccentric |
| Sizes | 3 inch to 48 inch (80-1200 mm) |
| Body Styles | Wafer, lug |
| Ratings | ANSI Class 150 to Class 600 |
| Body Material | Carbon steel, stainless steel |
| Trim / Seal | Double eccentric TFE, RTFE, or flexible metal |
| Shut-off Class | Class IV (metal) or Class VI (PTFE/RTFE) |
| Flow Characteristic | Equal percentage |
| Compatible Actuators | Model 96/97 rack-and-pinion; Model 34 Scotch yoke |
Why Choose Seven Star LLC for Masoneilan High-Performance Butterfly Control Valves
A double-eccentric-disc control valve like the 39004 series has to be sized correctly against your Cv requirements and paired with a compatible actuator and positioner — get either wrong and the valve either hunts around setpoint or can’t deliver the rangeability the process needs. Seven Star LLC reviews sizing calculations and actuator selection with your instrumentation team as part of the quotation process, drawing on our experience supplying Masoneilan control valves to refining, petrochemical, and gas processing sites across Oman and the wider GCC. We also help plan actuator and trim spare parts alongside the initial valve order, and coordinate delivery and on-site technical support so a critical control loop stays in commission through startup and beyond.
Request a Quote for Masoneilan 39004 High-Performance Butterfly Control Valve (9004 Series)
Seven Star LLC supplies the Masoneilan 39004 High-Performance Butterfly Valve with full manufacturer documentation and regional technical support. Contact our valve and instrumentation division for a formal B2B quotation, to confirm the correct size, trim, and actuator combination for your application, or to obtain the complete technical datasheet. Seven Star LLC ensures every unit shipped across Oman and the GCC is genuine Masoneilan hardware, correctly specified, and backed by local support.
Related Products
Masoneilan, a Baker Hughes brand, is a global leader in the design and manufacture of control valves, pressure regulators, and valve automation systems. With over a century of engineering excellence, Masoneilan products are trusted for precise flow control, durability, and performance across critical industrial processes.
Its extensive product portfolio includes spring-loaded regulators, globe control valves, positioners, and digital valve controllers designed to optimize efficiency and ensure safe, stable operation in oil & gas, chemical, and power generation applications.
Seven Star LLC supplies authentic Masoneilan valves and regulators across the Middle East, providing clients with high-quality process control solutions backed by Baker Hughes’ global expertise and local support.
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