Masoneilan 21000 Series Top-Guided Globe Control Valve
Overview
The Masoneilan 21000 Series is a single-ported, unbalanced-trim globe control valve from Baker Hughes with heavy top plug guiding, designed to handle a wide variety of process applications with one familiar valve platform. The Masoneilan 21000 is offered as a high capacity globe or angle body, and Baker Hughes builds a long list of trim and bonnet options around it: contoured plugs, soft seats, single- and double-stage Lo-dB noise attenuation, anti-cavitation trim, reduced-capacity and low-flow trims, extension and cryogenic bonnets, and a bellows-seal design for zero-emission requirements.
In Oman and the GCC, Seven Star LLC proudly supplies the Masoneilan 21000 to refineries, power plants, gas processing facilities and petrochemical sites across the Sultanate of Oman and the wider GCC. Our instrumentation and valve team in Muscat helps engineers match trim, bonnet, material and actuator to the duty, and every valve is supported with genuine Baker Hughes documentation and local technical assistance.
Operating Principle
The Masoneilan 21000 throttles flow by moving a single plug against a single seat ring. Because the plug is unbalanced and uses no balance seals or pilots, the trim is mechanically simple: the actuator moves a heavy plug that is guided at the top, and the seat ring is either a threaded or a quick-change design. Baker Hughes describes the heavy top guiding as the feature that gives the plug maximum support and stability under adverse conditions, which matters when pressure drop, vibration or side loading would otherwise make a lightweight plug chatter.
Where noise or cavitation is the problem, the conventional plug is replaced by a Lo-dB or anti-cavitation design. The Lo-dB trims are offered in single-stage and double-stage forms, and Baker Hughes states that noise reduction of up to 25 dBA is possible depending on the operating conditions. Flow direction follows the trim: contoured trims can run flow-to-open or flow-to-close, Lo-dB trims are flow-to-open, and anti-cavitation trims are flow-to-close. The inherent characteristic can be linear, equal percentage or modified percent, with a rangeability ratio of 50:1.
Engineering Design of the Masoneilan 21000
The Masoneilan 21000 Series is available in sizes from 0.75 to 8 inches (20 to 200 mm) with ASME Class 150 to 2500 ratings and equivalent PN classes; the technical specification notes that Class 900 to 1500 is available only in 0.75 to 4 inch sizes and Class 2500 only in 0.75 to 2 inch sizes. End connections include raised-face flanged, socket weld, threaded, ring-type joint and butt weld, and bonnets are offered as bolted standard, bolted extension or bolted cryogenic. Body and bonnet materials range from carbon steel and 316 stainless steel to chrome-molybdenum steel, duplex stainless steel and NORSOK M-650 carbon steel, with Inconel, Monel and Hastelloy available as exotic options.
Temperature capability depends on the bonnet and packing. With a standard bonnet and PTFE or Low-E packing the specification lists −20°F to +450°F (−29°C to +232°C), graphite packing extends the upper limit to +800°F (+427°C), and a cryogenic extension covers −320°F to +212°F (−196°C to +100°C). Standard seat leakage is Class IV, with optional constructions meeting Class V and, with a soft seat, Class VI; the soft seat is limited to 1000 psi shutoff and 450°F. Baker Hughes also lists an API 6FA firesafe option for certain sizes and classes and states that the valves meet the design and materials requirements of the PED Directive 2014/68/EU.
Key Features
The following capabilities explain why the Masoneilan 21000 remains a standard choice for general and moderately severe control duty:
- Heavy top plug guiding gives the unbalanced plug maximum support and stability across the stroke.
- Single- and double-stage Lo-dB and anti-cavitation trims replace the conventional plug where noise or cavitation limit the application.
- Reduced-capacity trims in all valve sizes and an optional low-flow trim widen the usable flow range of each body size.
- Hardened trim is provided as standard to handle high pressure drop service.
- Class IV leakage is standard, with optional constructions for Class V and Class VI shutoff.
- Low-E packing is available for low-emission compliance, and a bellows-seal design is offered for zero-emission requirements.
- Sour-service construction is available to NACE MR0103, with MR0175 or ISO 15156 requirements subject to engineering review.
- Spring-diaphragm and piston actuators, an optional handwheel and Masoneilan digital positioners let the valve be specified at the right level of automation.
Industrial Applications
Baker Hughes lists power generation, refining, petrochemicals, and midstream and upstream oil and gas as the target industries for the Masoneilan 21000, with typical duties such as steam turbine generator systems, condensers, cooling towers, heat recovery steam generators, distillation, hydroprocessing, compression, dehydration, refrigeration, liquefaction and regasification. In Oman these map directly onto combined-cycle and desalination power stations, the refining complexes at Sohar, gas treatment plants and LNG-related facilities, where a single valve family that can be fitted with cryogenic, bellows-seal or Lo-dB options simplifies spare-parts planning.
In Oman and the GCC, Seven Star LLC supplies the Masoneilan 21000 Series to EPC contractors, plant operators and maintenance organizations throughout Oman and the GCC, including projects in the Sohar and Salalah economic zones. For routine turnarounds we also supply the matching 21000 Series seal kit, Type 87/88 spring-diaphragm actuators, and, where a balanced plug is preferred, the Masoneilan 10000 Series double-port valve.
Technical Specifications
The table below summarizes the principal data of the Masoneilan 21000 as published in the Baker Hughes Masoneilan technical specification and fact sheet; please consult the official technical specification for complete data and dimensions.
| Parameter | Specification |
|---|---|
| Model | Masoneilan 21000 Series top-guided globe valve (globe or angle body) |
| Valve sizes | 0.75 to 8 in (20 to 200 mm) |
| Pressure ratings | ASME Class 150 to 2500 and equivalent PN |
| End connections | RF flanged, socket weld, threaded, RTJ, butt weld |
| Bonnet types | Bolted standard, bolted extension, bolted cryogenic |
| Body and bonnet materials | Carbon steel, 316 stainless steel, chrome-moly, duplex stainless steel, Inconel, Monel, Hastelloy |
| Trim | Contoured, soft seat, Lo-dB (1 or 2 stage), anti-cavitation (1 or 2 stage) |
| Seat ring | Threaded or quick change |
| Flow characteristic | Linear, equal percentage or modified percent |
| Rangeability | 50:1 |
| Seat leakage | Class IV standard; Class V and VI optional |
| Temperature (standard bonnet) | −20°F to +800°F (−29°C to +427°C) depending on packing |
| Actuation | Spring diaphragm (87/88) or piston (51/52/53); optional handwheel |
Related Masoneilan control valves for comparison are the Masoneilan PXR single-seated globe valve, Masoneilan 71000 Series streamlined angle valve and Masoneilan 77000 Series multi-stage valve.
Request a Quote for Masoneilan 21000
Engineers and procurement teams in Oman and across the GCC can send Seven Star LLC a formal RFQ for the Masoneilan 21000 Series, with trim, bonnet, material and actuator confirmed against your process data, regional warehouse availability checked, and the Baker Hughes technical specification available for download from this page. In Oman and the GCC, we back every valve with manufacturer documentation and responsive local support from our Muscat instrumentation division.
- Datasheet Masoneilan 21000 Series Technical Specifications Datasheet Download
Masoneilan control valves and actuator series
The globe valve listing centers on the 21000 series, including the cryogenic version with extension bonnet, and the 41005 cage-guided series in high pressure, API 6A and VRT anti-cavitation executions. The 80385 and 80386 are three-way combining and diverting valves. Rotary products include the 35002 Camflex II and the 37002 MiniTork II butterfly control valve. Actuators cover spring-diaphragm, cylinder and rack-and-pinion designs, among them the 5A cylinder actuator for Camflex II. Masoneilan also makes pressure regulators, SVI digital valve positioners and displacer-type level instruments, and offers Lo-dB trim for noise control.Where Masoneilan valves are used
Throttling duty on steam, hydrocarbons, gas and water is the daily work of these valves: 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 is decisive, since the factory record behind it lists trim, materials and actuator. Send a clear nameplate photo with 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.Browse Masoneilan products by category: Control Valves, Valve Actuator, Regulators, Valve Positioner, Level Transmitter.
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