High-Performance : EPDM Seat Butterfly Valves, NBR Seat Butterfly Valves, and PTFE (Teflon) Seat Butterfly Valves
In industrial flow control, the longevity of a butterfly valve is determined almost entirely by its seat material. Choosing between EPDM, NBR, and PTFE (Teflon) is critical to ensuring chemical compatibility, temperature resistance, and bubble-tight shut-off.
epdm seat butterfly valve, nbr seat butterfly valve, ptfe (teflon) seat butterfly valve
1. EPDM Seated Butterfly Valves
Ethylene Propylene Diene Monomer (EPDM) is the industry standard for general-purpose applications. It offers excellent resistance to weathering, ozone, and water-based chemicals.
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Temperature Range: -20°C to 120°C.
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Best For: HVAC systems, water treatment, fire protection, and low-pressure steam.
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Avoid: Petroleum-based oils, fuels, and mineral acids.
2. NBR (Buna-N) Seated Butterfly Valves
Nitrile Butadiene Rubber (NBR) is the preferred choice for applications involving oils and hydrocarbons. It provides a rugged seal with high tensile strength.
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Temperature Range: -10°C to 80°C.
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Best For: Hydraulic fluids, lubricating oils, animal fats, and air lines.
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Avoid: Ketones, strong acids, and brake fluids.
3. PTFE (Teflon) Seated Butterfly Valves
For high-purity or highly corrosive environments, Polytetrafluoroethylene (PTFE) is the gold standard. Often referred to by the brand name Teflon, these seats are nearly chemically inert.
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Temperature Range: -30°C to 200°C.
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Best For: Chemical processing, food and beverage (FDA compliant), pharmaceutical manufacturing, and aggressive acids.
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Design Note: Often used in "lined" butterfly valves where the disc and body are also protected from the media.
4. Technical Specifications Table
Feature | Industrial Standard | Our Specification |
|---|---|---|
Size Range | 2" to 48" (DN50 - DN1200) | Full range available in stock |
Pressure Class | ASME Class 150 / PN10 / PN16 | Rated up to 232 PSI (16 Bar) |
Body Materials | CI, DI, WCB, CF8M | Ductile Iron GGG40/50 (Standard) |
Seat Material | EPDM / NBR / PTFE | High-Density EPDM (Standard) |
Face-to-Face | API 609 / ISO 5752 | Short & Long pattern available |
Top Flange | ISO 5211 | Universal mounting for easy actuation |
Key Technical Features
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Bubble-Tight Shut-off: Precision-molded seats ensure zero leakage in both directions.
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Disc Materials: Available in Ductile Iron, Stainless Steel (CF8/CF8M), or Al-Bronze to match the seat’s chemical profile.
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Standard Compliance: Designed according to API 609 and ASME B16.34 standards.
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Actuation Ready: Features ISO 5211 top mounting pads for seamless integration with pneumatic or electric actuators.
Applications Across Industries
Whether it is a heavy-duty NBR seat for an oil refinery or an FDA-approved PTFE seat for a food processing plant, selecting the correct elastomer is vital for operational safety. These valves are widely used in:
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Desalination and Wastewater plants.
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Chemical and Petrochemical processing.
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Paper and Pulp industries.
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Marine and Shipbuilding.
Flowtorq Engineering India Pvt. Ltd.
60 Ft Road, Fatima nagar - Naigaon, Bhiwandi 421302, MH, India
Phone
+91-7028405198
+91-9028305198
+91-8007405198