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Brand: Masoneilan
Masoneilan 28000 Series VariPak Valve Seal & O-Ring Kit
Description
Overview
The Masoneilan 28000 Series VariPak is Baker Hughes’ compact, high-integrity globe/angle control valve built for small-bore, high-pressure applications including cryogenic and chemical injection service, where its heavy top-guided plug and tight packing box give precise control in a body small enough to fit tight skid layouts. Because the VariPak is frequently specified into cryogenic and CL2500 duty, its soft-good specification is unusually service-dependent: standard carbon-core braided PTFE packing is limited to CL1500, Lattyflon packing is used above that rating, and cryogenic-service bodies position the bonnet gasket deliberately away from the cold zone so it never sees the cryogenic fluid directly. None of this soft-good content is captured under a single Baker Hughes catalog number; it is engineered against the confirmed pressure class and service temperature of the installed valve.
Backed by manufacturer datasheet documentation, Seven Star LLC proudly supplies this Masoneilan 28000 Series VariPak valve seal and O-ring kit to LNG facilities, chemical injection skids, and high-pressure instrumentation packages across Oman and the wider GCC. Seven Star LLC’s instrumentation division confirms the pressure class, cryogenic or ambient service, and bellows or standard stem seal configuration against the customer’s nameplate before every order, so the correct packing, O-rings, and body gasket arrive matched to the actual installed valve.
Operating Principle
The Masoneilan 28000 Series VariPak throttles flow through a heavy, top-guided contoured plug, with an optional multi-staged Varilog anti-cavitation trim for services prone to flashing or cavitation damage at this valve’s typically high pressure drop-to-size ratio. Stem sealing is carried by carbon-core braided PTFE packing rated to CL1500, or Lattyflon packing at the CL2500 rating, reflecting how much more demanding the sealing duty becomes as pressure class increases on a body this compact. Where a bellows-sealed stem is specified for zero-leakage or hazardous service, Viton O-rings complete the bellows assembly seal, and because bellows integrity is safety-critical, these O-rings are never reused across a disassembly regardless of their visual condition.
On cryogenic VariPak valves, the bonnet is positioned away from the cold zone specifically so the body/bonnet gasket is never exposed to the cryogenic fluid, which protects the gasket material from thermal shock that would otherwise cause it to lose sealing integrity within a handful of cool-down cycles; this design detail also means the gasket kit for a cryogenic Masoneilan 28000 Series VariPak is not automatically interchangeable with an ambient-service valve of the same nominal size. The valve’s 316 stainless steel stem (22 HRC maximum in the NACE version), works with the packing and O-ring set to maintain a controlled-friction, low-leakage seal across repeated cryogenic or high-pressure cycles.
Engineering Design of the Masoneilan 28000 Series VariPak
The Masoneilan 28000 Series VariPak is built in a compact globe or angle body pattern covering just three sizes – 1/2 inch (DN 15), 3/4 inch (DN 20), and 1 inch (DN 25) – but spanning the full pressure range from CL150 through CL2500, reflecting its role as a small-bore, high-integrity valve rather than a high-capacity one. Standard body material is ASTM A182 Type F316/F316L stainless steel, with Monel, Hastelloy C, Alloy 20, and other nickel-based alloys available for corrosive or cryogenic service where standard stainless is not adequate.
Seven Star LLC packages the VariPak seal kit to the customer’s confirmed pressure class, cryogenic or ambient service, and stem seal type (standard packing or bellows), supplying the correct packing material, Viton bellows O-rings where applicable, and the body/bonnet gasket sized to the cryogenic or standard bonnet configuration, so plant technicians can complete a rebuild without discovering a CL2500 packing mismatch mid-job.
Key Features
This Masoneilan 28000 Series VariPak kit is engineered to restore full containment on an in-service compact high-pressure valve. Key features include:
- Carbon-core braided PTFE packing for CL150–1500 service, or Lattyflon packing for CL2500 service.
- Viton bellows O-rings supplied fresh for every disassembly of bellows-sealed Masoneilan 28000 Series VariPak valves.
- Body/bonnet gasket engineered for the cryogenic bonnet configuration, positioned away from the cold zone.
- Compatible with the heavy top-guided contoured plug and optional multi-staged Varilog anti-cavitation trim.
- Covers all three VariPak sizes – 1/2, 3/4, and 1 inch – across the full CL150–2500 pressure range.
- Kit contents cross-checked against the current Baker Hughes 28000 VariPak technical specification before dispatch.
- Suitable for standard, corrosive, and cryogenic service body materials (316/316L stainless, Monel, Hastelloy C, Alloy 20).
- Supplied with reassembly guidance covering packing selection by pressure class and bellows handling precautions.
Industrial Applications
The Masoneilan 28000 Series VariPak is specified across Middle East LNG, chemical injection, and high-pressure instrumentation packages wherever a compact, high-integrity valve is needed in a tight skid footprint – cryogenic LNG vaporizer trains, chemical injection skids on production platforms, and high-pressure sampling or utility systems. Facilities around Muscat, Sohar, and the Salalah free zone running LNG or cryogenic process trains schedule Masoneilan 28000 Series VariPak seal and O-ring rebuilds carefully around the specific pressure class involved, since a CL2500 valve rebuilt with standard CL1500 packing will not hold the rated pressure drop reliably.
Working closely with plant engineers in the region, Seven Star LLC distributes this Masoneilan 28000 Series VariPak seal kit to reliability and instrumentation teams across the Sultanate of Oman and the broader GCC, supporting LNG, petrochemical, and production facilities that depend on this compact platform for high-integrity small-bore control. Seven Star LLC’s manufacturer-verified sourcing ensures the pressure-class-specific packing and O-ring materials supplied are correct for the confirmed service.
Technical Specifications
Representative build data for the Masoneilan 28000 Series VariPak platform this kit is engineered to match:
| Parameter | Specification |
|---|---|
| Model | Masoneilan 28000 Series VariPak |
| Valve Type | Compact globe/angle control valve, top-guided contoured plug |
| Sizes Covered | 1/2, 3/4, 1 inch (DN 15, 20, 25) |
| Pressure Classes | CL150–2500 |
| Packing (CL150–1500) | Carbon-core braided PTFE |
| Packing (CL2500) | Lattyflon (PTFE) |
| Bellows O-Ring | Viton |
| Stem Material | 316 stainless steel (22 HRC max, NACE version) |
| Body Materials | ASTM A182 F316/F316L; Monel, Hastelloy C, Alloy 20 optional |
Request a Quote for Masoneilan 28000 Series VariPak Valve Seal & O-Ring Kit
Seven Star LLC invites facility engineers, procurement leads, and maintenance planners across Oman and the GCC to submit a formal RFQ for the Masoneilan 28000 Series VariPak valve seal and O-ring kit with the valve’s confirmed pressure class and cryogenic or ambient service, so the correct kit is engineered without guesswork. Seven Star LLC supplies common VariPak soft-good variants on request, can furnish the current Baker Hughes technical datasheet on request, and can connect customers with its instrumentation division for turnaround planning.
Browse the full Masoneilan range or see more Control Valves products supplied by Seven Star LLC in Oman and the GCC.
See also: Masoneilan 35002 GR Camflex II Globe Replacement Control Valve.
Datasheets & Documents
- Instruction Manual Masoneilan 28000 Series VariPak Valve Seal & O-Ring Kit Manual Download
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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.
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Frequently Asked Questions
Is there one fixed part number for the 28000 VariPak seal kit?
No. Packing, O-ring, and gasket content is engineered against the confirmed pressure class and cryogenic or ambient service, so Seven Star LLC verifies nameplate data before quoting.
Why does the packing change at CL2500?
the manufacturer lists Lattyflon packing for CL2500, while carbon-core braided PTFE is used for CL150 through CL1500 service.
How is the cryogenic VariPak gasket different from a standard one?
On cryogenic VariPak valves the bonnet is positioned away from the cold zone so the body gasket never contacts the cryogenic fluid directly, which changes the gasket location and specification versus an ambient-service valve.
Are bellows O-rings reused during a VariPak rebuild?
No. Viton bellows O-rings are normally replaced at every disassembly of a bellows-sealed VariPak valve, since bellows integrity is safety-critical and a compression-set O-ring cannot guarantee zero-leakage performance.
Is Seven Star LLC an experienced supply partner for Masoneilan products?
Yes. Seven Star LLC is an experienced supplier of Masoneilan in Oman and the GCC, supplying genuine seal kits, spares, and valves with part-number traceability.
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