Laux Valve manufactures wafer butterfly valves with PTFE (polytetrafluoroethylene) seats for applications requiring chemical resistance at an economical price point. Our PTFE seat wafer butterfly valves combine the compact, lightweight wafer body design with the proven chemical inertness of PTFE — providing an affordable alternative to fully PTFE lined valves for mild-to-moderate corrosive service. As a direct OEM manufacturer with 15+ years of export experience, we offer competitive factory pricing, flexible customization, and fast global delivery.
| Parameter | Specification |
|---|---|
| Size Range | DN40 – DN600 (NPS 1½" – 24") |
| Pressure Rating | PN6 / PN10 / PN16 |
| Design Standard | API 609, EN 593, GB/T 12238 |
| Face-to-Face | ISO 5752 Table 1 (short pattern), EN 558 Series 20 |
| Flange Compatibility | ANSI B16.5 Class 150, EN 1092-2 PN10/PN16, JIS B2220 10K |
| Operation | Lever Handle (≤DN200) / Gearbox (≥DN250) / Pneumatic / Electric |
| Actuator Interface | ISO 5211 top mounting pad — standard |
| Temperature Range | -20°C to +180°C |
| Leakage Rate | Class IV (standard) / Class VI (with PTFE energized seat option) |
Unlike fully PTFE lined butterfly valves which are significantly more expensive due to the complex body lining process, the PTFE seat wafer design places a pure PTFE seat ring in the valve body. The disc has a PTFE seat ring carrier that seals directly against the body PTFE seat. This provides PTFE chemical resistance where it matters — at the sealing interface — at a fraction of the cost of a fully lined valve.
| Feature | PTFE Seat | EPDM / NBR Seat |
|---|---|---|
| Chemical Resistance | Near-universal — acids, alkalis, solvents, oils, chlorine | Limited — each rubber type suits specific media only |
| Max Temperature | 180°C | 80°C (NBR) — 120°C (EPDM) |
| Leakage | Class IV–VI | Class VI bubble-tight |
| Wear Resistance | Moderate — not for abrasive slurries | Good — rubber absorbs particle impact |
| Best For | Chemical, acid, solvent, oil, chlorine, high temperature | Water, wastewater, HVAC, general service |
| Industry | Typical Media | Why PTFE Seat? |
|---|---|---|
| Chemical Processing | Dilute acids (HCl, H₂SO₄), caustic soda, solvents | Rubber seats fail rapidly; PTFE handles mild-to-moderate chemicals at lower cost than full PTFE lining |
| Oil & Gas | Crude oil, refined products, natural gas | PTFE resists hydrocarbon swelling and chemical attack |
| Water Treatment (Chemical Dosing) | Sodium hypochlorite, ferric chloride, PAC, sodium bisulfite | Treatment chemicals attack rubber; PTFE seat resists oxidation and chemical degradation |
| Pharmaceutical | Solvent recovery, CIP chemicals, purified water | PTFE has low extractables, will not contaminate product |
| Food & Beverage | CIP solutions, acids, alkalis, hot water | PTFE is FDA-compliant for food contact (virgin grade) |
| HVAC & District Energy | Hot water, thermal oil, steam condensate | PTFE handles 180°C — above rubber seat limits |
As a direct OEM manufacturer headquartered in China's largest butterfly valve manufacturing region, Laux Valve eliminates the multiple layers of distribution markup that inflate prices from Western-brand valves:
| Advantage | Detail |
|---|---|
| Factory-Direct Pricing | No distributor margin, no agent commission, no trading company markup — you deal directly with the manufacturer. |
| In-House Foundry Network | Long-term partnerships with qualified foundries ensure competitive raw material costs and consistent casting quality. |
| Mature Supply Chain | Located in Tianjin, China's largest valve manufacturing cluster, we benefit from an integrated supply chain for PTFE, fasteners, and seals. |
| Flexible MOQ | Small or mixed orders accepted — no minimum order quantity for standard configurations. |
| OEM / Private Label | Custom body casting with your brand name, custom nameplate, custom packaging, custom color — full OEM support. |
| Fast Lead Times | Standard DN40–DN300: 1–5 working days from stock. Custom configurations: 2–4 weeks. |
| Global Shipping | Exported to 45+ countries. FOB Tianjin / CIF to your port. Complete export documentation provided. |
| ISO 9001 Certified | Manufacturing and testing processes certified to ISO 9001:2015 quality management system. |
A PTFE seat valve uses a PTFE ring as the sealing element in an otherwise coated metal valve — the disc is nylon/epoxy coated ductile iron. A fully PTFE lined valve has the entire body interior and disc encapsulated in PTFE/PFA, so no metal contacts the fluid. PTFE seat valves cost 30–50% of fully lined valves and are appropriate for mild-to-moderate chemicals. For concentrated strong acids or ultra-pure media, a fully lined valve should be specified.
Standard PTFE seat valves achieve Class IV leakage (0.01% of rated Cv), which is sufficient for most on/off isolation applications. For bubble-tight (Class VI / Rate A) shut-off, we offer an energized PTFE seat option with an elastomeric backing ring (EPDM or Viton behind the PTFE, not contacting the fluid). Contact our team to discuss your leakage requirement.
PTFE is resistant to virtually all chemicals up to 180°C. The only substances that attack PTFE are molten alkali metals (sodium, potassium), elemental fluorine at elevated temperature and pressure, and chlorine trifluoride. For any other chemical — acid, base, solvent, oxidizing agent — virgin PTFE is chemically inert. Verify compatibility for your specific concentration and temperature with our engineering team.
Wafer butterfly valves are not recommended for dead-end (end-of-line) service because the downstream flange is required to support the valve and resist the reaction force of pipeline pressure. For dead-end service, a lug-type butterfly valve with threaded bolt holes is recommended.
Lead time for standard DN40–DN300 PTFE seat wafer butterfly valves is 1–5 working days from stock. Yes, we offer full OEM service: custom body casting with your brand, custom nameplate data, custom packaging, your logo on the hand lever — all at competitive OEM pricing with flexible MOQ.
Yes, all sizes feature an ISO 5211 top mounting pad as standard, compatible with direct mounting of pneumatic actuators, electric actuators, or worm gearboxes. We can supply the complete valve + actuator assembly, fully assembled and tested.
Contact Laux Valve today for a quotation on wafer butterfly valves with PTFE seats. Please advise size, pressure rating, medium, and quantity for our best factory price.
From raw material inspection to final delivery, every butterfly valve undergoes a comprehensive quality inspection to ensure reliable performance and compliance with international standards.
