Masoneilan 21000 C Cryogenic Extension Bonnet Globe Control Valve
Overview
The Masoneilan 21000 C is the cryogenic configuration of the Baker Hughes Masoneilan 21000 Series top-guided globe control valve. In the 21000 numbering system the optional configuration code C stands for Cryogenic, and it is used with a long extension bonnet and a stainless steel material set that keeps the packing box away from the cold fluid. Baker Hughes lists the construction as recommended for cryogenic liquid natural gas (LNG) applications at -320°F (-196°C), and asks customers to consult the factory for suitability in other cryogenic services.
As the official trusted supplier of Masoneilan in the Sultanate of Oman, Seven Star LLC supplies the Masoneilan 21000 C to LNG, industrial gas and cold-chain facilities across the GCC. Oman has an established LNG export business, and the same cryogenic know-how is needed for nitrogen, oxygen and argon plants, so our valve team in Muscat can review the fluid, minimum temperature and shut-off requirement with you and confirm the construction before an RFQ is raised.
How the Masoneilan 21000 C Handles Extreme Cold
Two problems appear when a normal control valve, unlike the Masoneilan 21000 C, meets a fluid at -196°C: the packing box freezes, so that the stem seal fails and ice forms on the stem, and ordinary carbon steel becomes brittle. The Masoneilan 21000 C addresses the first problem with a long cryogenic extension bonnet that lifts the packing box well above the cold body so that it works close to ambient temperature and a vapour column forms in the bonnet, and the second problem with austenitic stainless steel, which keeps its toughness at liquid natural gas temperatures. The packing is a PTFE V-ring set, with an optional lantern ring in austenitic stainless steel, and the temperature table of the specification gives a cryogenic extension range of -320°F to +212°F (-196°C to +100°C).
The extension has a visible effect on the height of the Masoneilan 21000 C. In the dimension tables of the specification, dimension C of the cryogenic extension bonnet is 23.70 in for 3/4 to 2 inch valves in ASME Class 150 to 600, 27.64 in for 3 and 4 inch valves, 31.84 in for the 6 inch valve and 34.71 in for the 8 inch valve. The standard bonnet of a 3/4 inch Class 150 valve is only 5.65 in, so this valve is several times taller, and piping designers who plan insulation and a cold box need to allow for this.
Engineering Design of the Masoneilan 21000 C
In short, the Masoneilan 21000 C keeps the single-ported, unbalanced trim and the heavy top guiding that characterise the 21000 Series, so the plug is supported at the top by a guide bushing outside the main flow path. The specification limits the trim offerings of the cryogenic construction to quick-change designs, which means that the seat ring is removed from the top after the bonnet is lifted, without cutting the valve out of the line. The Masoneilan 21000 C is offered in sizes of 3/4 to 8 inch (DN 20 to 200) with ASME Class 150 to 2500 and equivalent PN ratings, although Class 900 to 1500 is limited to 3/4 to 4 inch and Class 2500 to 3/4 to 2 inch. Flanged, socket weld, threaded, ring joint and butt weld connections are listed according to size and class.
Flow data for the Masoneilan 21000 C follow the standard 21000 contoured trim: linear characteristic, 0.8 inch (20.3 mm) travel in the 3/4 to 2 inch sizes and a critical flow factor FL of 0.93 at 10 percent travel falling to 0.90 at full travel. Seat leakage is Class IV or V to IEC 60534-4, and Baker Hughes asks that the factory be consulted for proper actuator sizing of the Masoneilan 21000 C so that the correct valve shut-off is achieved when the stem and extension contract in the cold. The Masoneilan 21000 C meets the design and material requirements of the Pressure Equipment Directive 2014/68/EU.
Materials of Construction of the Masoneilan 21000 C
The cryogenic construction table of the Masoneilan 21000 C lists austenitic stainless steel for every pressure-containing and wetted part. The valve body and bonnet are ASTM A351 grade CF8M (EN 1.4408), with ASTM A479 and A312 type 316 listed as bonnet alternatives. The plug stem is solution annealed 316 stainless steel hardened to ASTM A638 grade 660, the plug and the seat ring are 316 with Stellite No. 6 hardfacing, the cage is solution annealed 304 stainless steel as standard or 316 as an option, and the guide bushing is Stellite No. 6 or, optionally, ASTM A479 UNS S21800. Gaskets are 316L stainless steel spiral wound with graphite filler. Studs and nuts are ASTM A193 grade B8 and ASTM A194 grade 8 for the packing flange, and ASTM A453 grade 660 class A is used for body studs larger than 3/4 inch. JIS and EN material equivalents are available, and the factory must be consulted for NACE applications.
Extension Bonnet for Hot Service
A related option in the same numbering system is the EB extension bonnet. It is used at the other end of the temperature scale from the Masoneilan 21000 C, where the packing must be protected from heat. With an extension bonnet the specification lists a minimum temperature of -50°F (-46°C) and a maximum of +800°F (+427°C) with graphite packing, compared with -20°F to +450°F (-29°C to +232°C) for the standard bonnet and PTFE packing. Dimension C of the extension bonnet is 9.78 in for a 3/4 inch Class 150 valve. This valve should not be confused with the EB bonnet: the C option uses the long cryogenic extension and the stainless material set described above.
Key Features
The following points summarise the strengths of the Masoneilan 21000 C:
- Cryogenic extension bonnet keeps the PTFE V-ring packing box away from the cold fluid.
- Recommended materials for LNG service at -320°F (-196°C), with a cryogenic extension range of -320°F to +212°F (-196°C to +100°C).
- Austenitic stainless steel body and bonnet in ASTM A351 CF8M, with a stem hardened to ASTM A638 grade 660.
- Quick-change trim only, so the trim can be serviced from the top of the valve.
- Sizes from 3/4 to 8 inch and ASME Class 150 to 2500, with Class 900 to 2500 limited to the smaller sizes.
- Heavy top guiding with a Stellite No. 6 guide bushing and Stellite No. 6 hardfaced plug and seat ring.
- Class IV and Class V seat leakage to IEC 60534-4, and design to the Pressure Equipment Directive 2014/68/EU.
- Compatible with the 87/88 spring diaphragm and 51/52/53 piston actuators and the SVI digital positioner of the 21000 platform.
Industrial Applications
The Masoneilan 21000 C is intended for control of liquid natural gas at export terminals and satellite regasification stations, for boil-off and cold-box duties in air separation plants, and for cold liquid nitrogen, oxygen and argon streams in industrial gas and food-processing facilities. Typical loops include tank filling and transfer lines, vaporizer feed control and liquid level or pressure loops on storage vessels. Oman’s LNG sector, with its liquefaction plant on the Gulf of Oman coast, is the natural regional market, and industrial gas users in the Sohar and Salalah economic zones also need low temperature control valves.
In Oman and the GCC, Seven Star LLC supplies the Masoneilan 21000 C together with the complete 21000 range. For ordinary-temperature service of this platform see the Masoneilan 21000 Series seal kit page for spares, and for a heavier cage-guided alternative see the Masoneilan 41005 Series cage guided control valve. For positioning, a Masoneilan SVI3 digital valve positioner can be added to the actuator package.
Technical Specifications
The table summarises the principal published data of the Masoneilan 21000 C from the Baker Hughes 21000 Series technical specification. Please confirm complete data against the official document.
| Parameter | Specification |
|---|---|
| Model | Masoneilan 21000 C (21000 Series, cryogenic extension bonnet configuration, option code C) |
| Valve sizes | 3/4 to 8 in (DN 20 to 200) |
| Pressure ratings | ASME Class 150 to 2500 and equivalent PN; Class 900 to 1500 in 3/4 to 4 in; Class 2500 in 3/4 to 2 in |
| Temperature range, cryogenic extension | -320°F to +212°F (-196°C to +100°C); materials recommended for LNG at -320°F |
| Body and bonnet | ASTM A351 grade CF8M / EN 1.4408 |
| Plug stem | Solution annealed 316 stainless steel, hardened ASTM A638 grade 660 |
| Plug and seat ring | 316 stainless steel with Stellite No. 6 hardfacing |
| Packing | PTFE V-ring; optional lantern ring |
| Trim | Quick-change designs only; linear flow characteristic; FL 0.93 to 0.90 |
| Seat leakage | Class IV and V, IEC 60534-4 |
| Dimension C, cryogenic extension bonnet | 3/4 to 2 in: 23.70 in; 3 and 4 in: 27.64 in; 6 in: 31.84 in; 8 in: 34.71 in (Class 150 to 600) |
| Directive | Pressure Equipment Directive 2014/68/EU |
| Actuators | 87/88 spring diaphragm and 51/52/53 piston |
The complete 21000 family is described on the Masoneilan 21000 Series top-guided globe control valve page.
Request a Quote for Masoneilan 21000 C
Engineers and procurement teams in Oman and across the GCC can send Seven Star LLC a formal RFQ for the Masoneilan 21000 C with the fluid, minimum temperature, pressure drop, line size and shut-off requirement stated, so that the construction and actuator can be confirmed with the factory. Regional availability is checked, and the Baker Hughes technical specification and instruction manual can be downloaded from this page. In Oman and the GCC, we back every valve with manufacturer documentation and local support from our Muscat instrumentation division.
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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