National Filtration Systems
High-Reliability Transfer & Diverter Valves for Critical Filtration and Gas Separation Service
National Filtration Systems (NFS) designs and manufactures industrial filtration, separation, and modular skid systems engineered for demanding process environments. As an ASME Code Certified manufacturer, NFS delivers equipment that meets the highest standards for safety, quality, and long-term reliability across a wide range of industries.
Our filtration and separation systems are trusted for the removal of liquid and solid contaminants from gases (including air) and liquids, with particular expertise in Gas Separator Systems where performance, pressure integrity, and cleanliness are critical.
Engineered Transfer & Diverter Valves for Filtration Systems
National Filtration Systems Transfer and Diverter Valves are manufactured to exacting standards and are specifically selected to meet the demands of filtration, separation, and critical fluid handling applications.
These valves combine rugged fabricated steel construction, patented sealing technology, and field-serviceable design to deliver zero leakage, low pressure drop, and long service life.
Key Design Features & Performance Advantages
Fabricated All-Steel Body
Each valve features a fully fabricated steel body, providing superior structural integrity compared to cast designs.
Benefits:
- High mechanical strength and durability
- Excellent resistance to vibration and thermal cycling
- Ideal for continuous industrial service
- Internally plated for corrosion protection
Compact, Space-Saving Design
The valve’s compact footprint allows installation in tight skid layouts and congested piping systems.
Benefits:
- Reduced skid size and overall system footprint
- Easier integration into modular filtration systems
- Ideal for retrofit and OEM applications
Positive Seal with True Zero Leakage
At the heart of the valve is a patented shoe seal with positive mechanical lockdown, ensuring zero leakage to the inactive side of the system.
Why this matters:
- Prevents cross-contamination between clean and dirty streams
- Protects downstream equipment and filter media
- Maintains system integrity during transfer or diversion
- Eliminates bypass leakage common in plug and ball valves
Stainless Steel Linkage Mechanism
The internal shoe and linkage mechanism is manufactured from stainless steel, providing:
- Excellent corrosion resistance
- Smooth, repeatable operation
- Long service life in aggressive environments
- Consistent sealing performance over time
Replaceable Seals – Viton® Available
All sealing elements are fully replaceable, with Viton® elastomer options available for higher temperature and chemical compatibility.
Benefits:
- Extended valve life
- Reduced total cost of ownership
- Easy adaptation to changing process conditions
- Simplified maintenance planning
Multiple End Connection Options
Valves are available with Flanged, Butt Weld, or FNPT connections, allowing seamless integration into existing piping systems.
Advantages:
- Flexibility for new installations or retrofits
- Compatibility with industry-standard piping practices
- Reduced installation complexity
Material Options: 304SS or 316SS Bodies
For corrosive or sanitary environments, valves are available in 304 or 316 stainless steel construction.
Ideal for:
- Gas separation systems
- Filtration of aggressive fluids
- Clean process applications
- Long-term corrosion resistance
API-614 Compliant Design
The valve design meets API-614 requirements, making it well suited for:
- Turbine and compressor lubrication systems
- Power generation auxiliary systems
- Critical oil and process fluid transfer applications
Exceptionally Low Pressure Drop
The patented sealing and flow path design delivers very low pressure drop, even during valve changeover.
Benefits include:
- Improved system efficiency
- Reduced pumping energy
- Stable process conditions
- Uninterrupted flow during transfer
Broad Size Range: 1-1/2″ to 6″
Standard valve sizes range from 1-1/2″ through 6″, covering the majority of industrial filtration and separation requirements.
Inlet & Outlet Pressure Taps (1/4″ NPT)
Integrated 1/4″ pressure taps allow easy monitoring of inlet and outlet pressures.
Advantages:
- Simplified system diagnostics
- Easy differential pressure measurement
- Enhanced system monitoring and control
Fully Field-Serviceable Design
Every component of the valve is field replaceable using standard hand tools.
This delivers:
- Minimal downtime during maintenance
- No need to remove the valve body from the line
- Lower lifecycle maintenance costs
- Increased confidence in long-term operability
Designed for Filtration & Gas Separation Applications
The valve’s center-body lip ring seal ensures that contaminated fluid cannot migrate to the clean side—a critical requirement in filtration and separation service.
This makes the valve ideal for:
- Gas filtration and separation systems
- Liquid filtration skids
- Duplex filter changeover
- Cooler and heat exchanger bypass applications
- Clean/dirty stream isolation
Proven, Rugged, and Built for Long-Term Service
With a welded machine-steel body, internally plated surfaces, and stainless steel sealing mechanisms, National Filtration Systems transfer valves are built for decades of trouble-free service.
The same patented sealing technology is also available in:
- 3-Way Transfer Valves
- Split 3-Way Valves for cooler and heat exchanger applications
All designs share the same zero-leakage, low-pressure-drop seal system.
The Bottom Line
National Filtration Systems transfer valves deliver:
- Zero leakage sealing
- Protection of clean process streams
- Low pressure loss and uninterrupted flow
- Field-serviceable, long-life construction
- Proven performance in filtration and gas separation systems
When process integrity, reliability, and uptime matter, National Filtration Systems provides the valve solution you can trust.