Custom Machined Teflon Valve Seats
Precision CNC machined PTFE and engineered plastic valve seats for check valves, ball valves, and control valves in chemical processing, water treatment, and industrial applications
- Custom valve seats machined for any valve size and configuration
- Virgin PTFE, glass-filled, carbon-filled, and PEEK materials available
- Universal chemical resistance prevents corrosion and contamination
- NSF-certified and FDA-compliant materials for water and food applications
- Reverse engineering service for obsolete valve seat replacement
- Chicago-based precision manufacturing since 1986
Overview
Precision CNC machined Teflon valve seats for leak-free operation in demanding chemical and industrial service.
CDS Plastics manufactures custom machined PTFE valve seats that provide superior sealing performance and chemical resistance for check valves, ball valves, gate valves, and control valves. Our precision CNC machining creates the critical sealing surfaces that prevent leaks while withstanding aggressive chemicals, extreme temperatures, and high-pressure service. We machine valve seats from virgin PTFE, glass-filled PTFE, carbon-filled PTFE, and PEEK materials to match your specific application requirements. Whether replacing corroded metal seats, repairing obsolete valves, or upgrading to chemical-resistant materials, our custom machining capabilities produce exact-fit valve seats without tooling investment.
Why Choose CDS Plastics Valve Seats
Universal Chemical Resistance
PTFE valve seats are chemically inert to virtually all industrial chemicals, acids, bases, and solvents. No corrosion, no contamination, no degradation. Maintains sealing performance in aggressive chemical service.
Precision Sealing Surfaces
CNC machining creates smooth, flat sealing surfaces with precise angles and dimensions. Tight tolerances ensure proper contact between seat and closure element, eliminating leaks and extending valve service life.
Self-Lubricating Operation
PTFE's natural low-friction properties eliminate need for external lubrication. Smooth valve operation reduces wear on both seat and closure element while preventing contamination from grease or oil.
Custom Sizes Without Tooling
CNC machining produces valve seats in any size without mold tooling costs. Accommodate non-standard valve dimensions, obsolete models, and custom configurations economically for single replacements through production quantities.
Solutions for Common Valve Seat Problems
Corrosion from Chemical Exposure
Obsolete Valve Parts Unavailable
Persistent Valve Leakage
High Temperature Degradation
Contamination from Lubrication
Technical Specifications & Capabilities
Valve Types & Configurations
- Check valve seats (swing, lift, ball)
- Ball valve seats (trunnion and floating)
- Gate valve seats
- Butterfly valve seats
- Control valve seats
- Plug valve seats
Machining Capabilities
- Seat diameter: 0.5" through 24"
- Sealing angles: 45°, 60°, 90° or custom
- Flatness: ±0.002" across sealing surface
- Surface finish: 32Ra standard, finer available
- O-ring grooves and mounting features
- Press-fit, threaded, or adhesive mounting
Material Selection Guide for Valve Seats
| Material | Key Properties | Temperature Range | Best Applications |
|---|---|---|---|
| Virgin PTFE | Universal chemical resistance, lowest friction, FDA/NSF compliant | -400°F to 500°F | General purpose, pure chemicals, food/pharma, ultra-pure water |
| Glass-Filled PTFE (15-25%) | Improved dimensional stability, reduced cold flow, better wear | -400°F to 500°F | High pressure service, tight sealing requirements, reduced creep |
| Carbon-Filled PTFE (15-25%) | Enhanced strength and stiffness, excellent wear resistance | -400°F to 500°F | Abrasive slurries, high cycle applications, improved dimensional stability |
| Bronze-Filled PTFE | Highest load bearing capacity, extreme wear resistance | -400°F to 550°F | High pressure/temperature, heavy duty service, compressor valves |
| PEEK | Excellent mechanical strength, steam resistant, USP Class VI available | Up to 480°F continuous | High temperature, steam service, pharmaceutical autoclaving |
| PVDF (Kynar®) | Excellent chemical resistance, rigid, UV stable | -40°F to 280°F | Strong acids/bases, chlorinated systems, outdoor installations |
| UHMW-PE | Excellent abrasion resistance, low friction, impact tough | -260°F to 180°F | Slurry service, abrasive chemicals, cost-effective applications |
Information We Need From You
To machine your valve seats, provide us with:
- Valve type and manufacturer (if known)
- Seat inside and outside diameters
- Seat thickness or height
- Sealing surface angle (45°, 60°, 90°)
- Mounting method (press-fit, threaded, adhesive)
- Fluid/chemical type for material selection
- Operating temperature and pressure
- Drawing or existing seat for dimensional capture
Industries and Applications
Chemical Processing
- Acid and base handling valve seats
- Solvent transfer system check valves
- Corrosive gas control valves
- PTFE seats withstand aggressive chemical exposure
- No corrosion byproducts contaminate process streams
Water & Wastewater Treatment
- Chlorine-resistant valve seats for chemical feed
- NSF-61 certified materials for potable water
- Check valve seats for pumping stations
- Control valve seats for process optimization
- Corrosion-free performance in chlorinated environments
Pharmaceutical Manufacturing
- USP Class VI compliant valve seats
- Sanitary check valves for process piping
- Steam sterilizable PEEK valve seats
- Clean-in-place compatible materials
- Zero contamination from seat materials
Food & Beverage Processing
- FDA-compliant PTFE valve seats
- Sanitary valve components for product transfer
- Check valves in CIP/SIP systems
- Non-contaminating materials prevent taste/odor transfer
- Washdown-resistant for daily cleaning protocols
Semiconductor & Electronics
- Ultra-pure chemical delivery valve seats
- Vacuum system check valves
- Plasma etching gas control valves
- Cleanroom-compatible materials prevent contamination
- Precision tolerances maintain system integrity
Oil, Gas & Petrochemical
- High-pressure valve seats for wellhead applications
- Sour gas service PTFE seats
- Compressor valve seats (carbon and bronze-filled)
- High-temperature service up to 500°F
- Abrasion-resistant seats for slurry applications
Ordering Process
We manufacture custom valve seats from your drawings and specifications.
Information Required for Quoting
- Technical drawing or detailed dimensions
- Valve type and size
- Material requirements based on your application
- Quantity needed and delivery timeline
- Existing valve seat for reverse engineering (if applicable)
Common Valve Seat Features
- Sealing angles: 45°, 60°, 90° or custom
- Mounting: Press-fit, threaded, or bonded
- O-ring grooves: Standard or custom dimensions
- Back angles: For improved sealing contact
- Counterbores: For closure element clearance
Reverse Engineering Service Available
Send us your existing valve seat for complete dimensional analysis. We'll capture all specifications and manufacture exact replacements with documentation for future reorders.
Frequently Asked Questions
Why choose PTFE valve seats over metal seats?
PTFE valve seats eliminate corrosion completely, providing permanent chemical resistance that metal seats cannot match. The naturally low friction coefficient reduces valve operating torque and wear on both seat and closure element. PTFE seats prevent contamination of process fluids from corrosion byproducts and eliminate need for external lubrication. For chemical processing, pharmaceutical, and water treatment applications, PTFE's chemical inertness and self-lubricating properties deliver superior long-term performance.
Can you replicate obsolete valve seats?
Yes. Our reverse engineering service captures all critical dimensions from your existing valve seat. We create detailed documentation and machine exact replacements that fit your valve precisely. This service is essential when original equipment manufacturers no longer support legacy valves or when imported equipment requires custom replacement parts unavailable domestically.
How do I select the right PTFE grade for my valve seat?
Virgin PTFE provides universal chemical resistance for general applications. Glass-filled PTFE offers better dimensional stability for high-pressure service and tight sealing requirements. Carbon-filled PTFE provides enhanced wear resistance for abrasive slurries. Bronze-filled PTFE handles the highest loads in compressor valves. Our team can help you select the appropriate material grade based on your operating pressure, temperature, chemical exposure, and cycle frequency.
What's the minimum quantity for custom valve seats?
We machine single valve seats for emergency repairs through production quantities for preventive maintenance programs. CNC machining requires no tooling investment, making custom valve seats economical for any quantity. Most orders range from single replacements to several hundred pieces depending on valve population and maintenance schedules.
