Brand: Masoneilan

Masoneilan 39004 High-Performance Butterfly Control Valve (9004 Series)

Name: Masoneilan 39004 Butterfly Valve – Datasheet & Price Quote
Brand: Masoneilan

Description

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 a trusted 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 datasheet 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 supplies this item on request with the manufacturer documentation, and availability and lead time are confirmed at quotation.

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About brand

Masoneilan is a control valve brand of Baker Hughes with roots going back to 1882. Its Camflex eccentric plug rotary valve, 21000 series globe valve and SVI digital positioners are fixtures in refineries, gas plants and power stations. Every valve carries a serial number and a long model number that define the actuator, body and trim.

Seven Star LLC is an independent supplier listing Masoneilan control valves, actuators, regulators, positioners and level instruments for buyers in Oman and the GCC. We source complete valves as well as Masoneilan spare parts against that nameplate data.

Masoneilan at a glance

Origin	Mason Regulator Company, Boston area, USA (1882). It acquired the Neilan Company of California in 1931, and the two names became Masoneilan.
Ownership	Dresser Industries from 1985, then GE Oil & Gas, now Baker Hughes
Milestones the company cites	Cv flow coefficient introduced (1944), spring-diaphragm actuators (1955), Camflex rotary globe valve (1968), Lo-dB low-noise trim (1975), LincolnLog axial-flow letdown valve (1982), Varipak (1984), V-Log (1998), SteamForm steam conditioning valve (2002)
Product families	Globe, rotary, butterfly and severe-service control valves, actuators, digital positioners, self-operated regulators and displacer level instruments
Typical duty	Throttling control of steam, gas, hydrocarbons and water, high-pressure letdown, anti-cavitation and low-noise service

Masoneilan control valves and actuator series

Series	Type	Typical use
21000, 21009	Top-guided and cage-guided globe valves	General process control. Cryogenic (21000 C), bellows seal (21000 BS) and API 6A versions are also made
41005	Cage-guided globe valve	Higher pressure drop and larger sizes, up to 30-36 inch extended sizes; VRT anti-cavitation and API 6A versions
35002 Camflex II	Eccentric plug rotary control valve	Erosive, flashing and dirty service; HC high capacity, DVD low noise and GR globe replacement versions
37002 MiniTork II, 39003/39005, 33000	Butterfly control valves, high-performance and triple-offset	Large flows at low pressure drop, and tight-shutoff duty
28000 Varipak	Microflow control valve	Very small flows, with adjustable Cv
78400/18400 LincolnLog, 77000, 49000 V-Log	Severe-service multi-stage valves	High-pressure liquid letdown, anti-cavitation and gas noise reduction
84000/84003 SteamForm, DSH	Steam conditioning valves and desuperheaters	Turbine bypass and steam pressure and temperature reduction
87/88, 37/38, 51/52/53	Spring-diaphragm and piston actuators	Linear and rotary valve actuation; diaphragms and soft-goods kits are listed separately
SVI3, SVI II AP, SVi1000, SVI FF	Digital valve positioners	HART or FOUNDATION Fieldbus positioning with valve diagnostics; the SVI II ESD adds partial stroke testing
4700/4800, 8013	Pneumatic and electro-pneumatic positioners	Older installed base. Many sites move to SVI positioners at overhaul
525/526, 535/536, 171-174	Self-operated pressure regulators	Pressure reducing and back-pressure control without external power
12400, 12800	Displacer level transmitters and controllers	Digital (12400, HART, SIL 2 version 12420) and pneumatic (12800) level control on separators and vessels

Where Masoneilan valves are used

Throttling duty on steam, hydrocarbons, gas and water is the daily work of these valves. Typical services are feedwater and steam conditioning in power plants, separator and compressor loops in gas processing, high-pressure-drop letdown, cryogenic service in LNG and air separation, and general flow, pressure and level control in refineries and chemical plants.

Ordering Masoneilan valves and spare parts: what we need

For spare parts the serial number decides the order, because the factory record behind it lists the trim, materials and actuator. Send a clear nameplate photo with the serial number, model number, size and pressure class. For a new valve, add the process data: fluid, inlet and outlet pressure, temperature, minimum, normal and maximum flow, required leakage class, fail position, air supply and control signal. When an older positioner or valve series is no longer made, we quote the successor that Baker Hughes names and list the mounting kit it needs.

Facts checked against Baker Hughes Masoneilan product information and the company's published timeline, October 2026.

Browse Masoneilan products by category: Control Valves, Valve Actuator, Regulators, Valve Positioner, Level Transmitter.

FAQ

Questions about the Masoneilan 39004 High-Performance Butterfly Control

Answers from our engineering team on installation, compatibility and integration.

01What makes the 39004 a high-performance butterfly valve?

It uses a PTFE, RTFE, or metal seal ring instead of a liner, combined with double offset (eccentric) disc operation, distinguishing it from a conventional swing-through butterfly valve.

02Why does the double eccentric design reduce torque and wear?

The offset pivot axis lifts the disc away from the seat immediately upon opening, avoiding the dragging or rubbing contact that a centered-disc butterfly valve experiences, which reduces both operating torque and seal wear.

03What size range does the 39004 cover?

The 39004 Series is available from 3 inches to 48 inches (80 to 1200 mm) in wafer or lug body styles.

04What shut-off classes are available?

Depending on the seal material selected, the 39004 offers Class IV (metal) or Class VI (PTFE/RTFE) shut-off performance.

05Does Seven Star LLC supply this part across the GCC?

Yes, Seven Star LLC sources and supplies the Masoneilan 39004 High-Performance Butterfly Valve to refinery, gas processing, and petrochemical customers across Oman and the wider GCC region.