Masoneilan™ 28000 Series Varipak™ Control Valves
Precision Flow Control for Demanding Applications
Trusted Masoneilan Valve Supplier – Fluid Tech, Vaal Triangle & Free State.
The Masoneilan™ 28000 Series Varipak™ Control Valves from Baker Hughes deliver precision flow control across low-flow industrial processes. These microflow control valves are designed to perform in a wide variety of service conditions, including high pressure, cryogenic, anti-cavitation, and toxic media environments.
Engineered for Microflow Control Accuracy
The 28000 Series Varipak stands out with its wide Cv range – from 0.0016 to 3.8 – achieved with just eight plugs and five seat sizes. This minimises inventory needs while maximising flexibility across application requirements. Whether for research-scale dosing or process-critical regulation, this control valve is engineered to deliver exceptional stability and consistency in low-flow environments.
Cv Accuracy and Range
- Trim Numbers 0 to 9
- Precise Cv adjustment from 0.0016 to 3.8
- Cv ratio of 500:1 (max) and 200:1 (min)
- Linear and modified linear flow characteristics
- Flow-to-open (standard), flow-to-close (optional)
The adjustable Cv feature allows field-tuning without needing to replace internal components – ideal for adapting to varying service demands.
Varipak Configurations and Application Fit
The Masoneilan 28000 Series Varipak is available in multiple body styles and configurations, offering application-specific flexibility while maintaining consistent internal components for simplified maintenance and serviceability.
As a trusted Masoneilan valve distributor in the Vaal Triangle and Free State, Fluid Tech offers expert support and reliable access to the full Varipak range.
Need Vales, Valve Repairs / Reconditioning? Call us on 082 414 6756
Available Body Types
- Standard Flangeless Varipak: Compact, lightweight, and versatile for general applications.
- Flanged Varipak: With ASME Class 150–1500 ratings, ideal for critical process environments.
- Varilog™ Anti-Cavitation Varipak: Engineered for high-pressure drops with multistage trim to mitigate cavitation.
- High Pressure Varipak: ASME Class 2500-rated for extreme upstream pressures or high ΔP service.
- Bellows Seal Varipak: Designed to prevent packing box leakage – ideal for hazardous or toxic media.
- Cryogenic Varipak: Incorporates thermal insulation features for cold-box installation and extreme low temperatures.
Each configuration is available in ½”, ¾”, and 1″ sizes, with threaded, flanged, and flangeless connection options.
Masoneilan Rotary Control Valves
Eccentric Plug
35002 Series Camflex II
PFA Lined
31000 Series
Triple Offset Butterfly
33000 Series
Swing-Through Butterfly
37002 Series Minitork™ II
Key Benefits of the Masoneilan 28000 Series
The 28000 Series is a control valve range known for performance and reliability in precision metering. Core features include:
Wide Cv Range
Allows one valve design to cover a wide array of application requirements.
Flexible Trim Options
- Contoured, heavy top-guided plug design
- Multi-stage anti-cavitation trims available
- Metal seats with options for solid Stellite and Monel
Actuator Versatility
- Spring-opposed rolling diaphragm actuators
- Air-to-open or air-to-close
- Adjustable Cv knob or fixed Cv design
- Optional handwheel for manual override
Temperature & Pressure Performance
- Operating range: -320°F to +650°F (-196°C to +343°C)
- Available with Class IV (standard) or Class V (optional) seat leakage
- ASME ratings up to Class 2500 and ISO PN 420
Materials of Construction
Built with corrosion resistance and longevity in mind, the Varipak body and trim use high-grade alloys and engineered seat designs.
Standard and Optional Materials
- Body: 316L Stainless Steel (Forged or Cast), Monel, Hastelloy C, Alloy 20
- Seat & Plug: Solid Stellite No. 6/12, 17-4 PH SS, Monel (NACE compliant options available)
- Bellows (where applicable): 316L Stainless Steel
- Gaskets: Spiral wound 316SS with flexible graphite fillers
- Packing: Carbon core braided PTFE, Lattyflon, optional Viton O-rings
All materials conform to NACE MR0103 specifications, and Class I-III bolting where applicable.
Advanced Accessories & Positioners
To support modern industrial control requirements, the Varipak can be equipped with a wide selection of accessories:
Pneumatic Positioner – Model 7700P
- Force-balance pneumatic
- Split range capability
- Fast stroke response (<1 second)
- Sensitivity and repeatability within 0.1%
Electropneumatic Positioner – Model 7700E
- 4–20 mA signal input
- Compact, non-linkage mounting
- Hazardous location approvals (ATEX, FM, CSA)
Optional Enhancements
- Proximity sensors and limit switches
- Solenoid valves
- Digital positioners (HART and Foundation Fieldbus)
- Manual handwheel for override operations
Precision for Critical Applications
Whether in pharmaceutical dosing, cryogenic liquefaction, chemical injection, or research and development labs, the 28000 Series Varipak supports application-specific needs through its modularity, reliability, and adaptability. These control valves are also trusted in refinery, petrochemical, and fine chemical processing environments where consistent microflow is vital.
The anti-cavitation Varilog trims drastically reduce wear and vibration, extending service life. The cryogenic design simplifies serviceability by allowing plug inspection without removing the body from the cold box.
Masoneilan Reciprocating Control Valves
Double Seated Globe Valve
10000 Series
Globe & Angle Top-Guided Valve
21000 Series
Micro-Trim Globe Valve
28000 Series VariPak™
Globe & Angle Cage-Guided Valve
41005 Series
Need Vales, Valve Repairs / Reconditioning?
Masoneilan Severe Service Control Valves
Angle Valve with Lo-dB and V-LOG Trim
72000 Series
Multi-Stage Valves (Angle/Globe)
77003 Series
LincolnLog
78400/18400 Series
Globe & Angle Style with Lo-dB / V-LOG Trim
49000 Series
Why Choose Fluid Tech?
At Fluid Tech, we specialise in distributing and supporting Masoneilan control valves across the Vaal Triangle and Free State regions. Our technical expertise ensures seamless product selection, specification alignment, and after-sales support.
We offer:
- Access to the complete Masoneilan valve range, including the 28000 Series
- Expert valve specification advice
- Stock availability and quick turnaround
- On-site support and installation consulting
- Fully backed by Baker Hughes technical documentation and warranty
Need Vales, Valve Repairs / Reconditioning? Call us on 082 414 6756
Need Valve Repairs / Reconditioning?
Contact Fluid Tech for Masoneilan™ Valves
Looking for trusted control valve solutions? Whether you’re upgrading, specifying a new installation, or maintaining existing assets, Fluid Tech is ready to assist.
Get the right Masoneilan™ 28000 Series Varipak™ valve for your needs.
Contact our sales team today or request a quote tailored to your application.
Proudly serving the Vaal Triangle and Free State industrial sectors.
Frequently Asked Questions (FAQ)
Q: What is the maximum Cv available in the Varipak 28000 Series?
A: The series supports a Cv up to 3.8, covering a wide range of microflow applications using just a few trim combinations.
Q: Can the Varipak be used for cryogenic service?
A: Yes. The 28000 EB Series is specifically engineered for cryogenic applications, including insulation isolation, material selection for cold ductility, and safe cold box installation.
Q: Is anti-cavitation protection available?
A: Yes. The 28000 MS Series Varilog variant provides multi-stage anti-cavitation trim for high ΔP and erosion-prone applications.
Q: What seat leakage classes are offered?
A: Class IV is standard. Class V is available as an option across most variants, including the cryogenic and high-pressure models.
Q: Are these valves suitable for hazardous environments?
A: Yes. When equipped with the appropriate accessories such as the 7700E electropneumatic positioner, the Varipak is approved for ATEX, CSA, and FM hazardous location use.
Q: What body materials are available for corrosive service?
A: Options include 316L Stainless Steel, Monel, Hastelloy C, and Alloy 20, depending on service compatibility.