DEMCO Series NEI-T Teflon-Lined Sanitary Butterfly Valve, 2″–10″
Butterfly ValvesLead time · 14 days
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DEMCO Series NEI-T Teflon-Lined Sanitary Butterfly Valve, 2″–10″Teflon-lined butterfly valve for "clean lines" in food and beverage plants and for highly corrosive chemical service. Inert, aseptic, non-stick virgin Teflon liner.
Key features
- Series: NEI-T
- Body configuration: Wafer (short-neck) and Lug (long-neck)
- Sanitary / FDA service
- ASME pressure class: ASME Class 150 (285 psi non-shock body rating)
- Series
- NEI-T
- Body configuration
- Wafer (short-neck) and Lug (long-neck)
- Sanitary / FDA service
- yes
- Size range
- 2″ – 10″ (50 – 250 mm)
- ASME pressure class
- ASME Class 150 (285 psi non-shock body rating)
- Operating temperature range
- +20°F to +275°F (−7°C to +135°C) — Teflon liner inert across the range
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24-month warranty
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Product description
The DEMCO Series NEI-T is a Teflon-lined butterfly valve, ideal for "clean lines" in food and beverage plants and for highly corrosive chemical service where the inert, aseptic and non-stick character of Teflon is required. The seat consists of a virgin Teflon liner overlaying and bonded to an elastomer cushion (Buna-N or EPT) which provides resilience for sealing. Available in wafer (short-neck) and lug (long-neck) styles, sizes 2″ through 10″, with the broadest range of corrosion-resistant body and disc materials of any DEMCO series including Hastelloy C and Alloy 20. 150 psi drop-tight shut-off across all sizes.
Construction
- Body configurations: Wafer (short-neck) and Lug (long-neck)
- Size range: 2″ – 10″ (50 – 250 mm)
- End connections: ASME Class 125/150 flanges
- Body materials: Ductile iron, gray iron (lug long-neck), aluminium bronze, carbon steel, aluminium (wafer only), 316 stainless steel, Hastelloy C
- Stem materials: 316 stainless, Monel, Hastelloy C
- Disc materials: 316 SS (polished or unpolished), Alloy 20, Hastelloy C
- Seat elastomers: Buna-N/Teflon (peroxide-cured), EPDM/Teflon (peroxide-cured or sulfur-cured) — virgin Teflon liner overlaying and bonded to elastomer cushion (Buna-N or EPT)
- Bearings: Bronze (standard); throttling discs include 4 stem O-rings for stem sealing.
Performance
- Pressure class: ASME Class 150 (285 psi non-shock body rating).
- Drop-tight shut-off ratings: 150 psi (drop-tight).
- Vacuum: Sealed against 10 microns of vacuum (29.9 in Hg).
- Temperature range: +20°F to +275°F (−7°C to +135°C) — Teflon liner inert across the range.
- Bi-directional sealing: Identical drop-tight closure from either flow direction.
- End-of-line service: Not rated for end-of-line service.
- Flow coefficient (Cv at 90° open): 145 (2″) → 5,000 (10″).
Engineered features
- Virgin Teflon (PTFE) liner — inert, aseptic, non-stick
- Teflon overlays a Buna-N or EPT elastomer cushion for resilience
- Hastelloy C and Alloy 20 body / disc options for the most aggressive chemical service
- Polished or unpolished 316 SS disc for sanitary or chemical applications
- Wafer (short-neck) for between-flange installation; lug (long-neck) for clearance over insulation
- 150 psi drop-tight closure across all sizes
- Same trim-handle range as the NE-I Sanitary series — bronze hub with SS fasteners for caustic wash-down
Typical applications
- Aseptic food and beverage clean-in-place (CIP) loops
- Pharmaceutical purified-water and process service
- Chemical processing — strong acids, caustics, solvents
- Pulp and paper bleach plant
- Specialty cosmetics and personal-care lines
- Semiconductor ultra-pure water and chemical handling
How to order
DEMCO uses an 11-character part number to specify each unique configuration. Build the part number from the base number plus six selection digits:
| Position | Selection |
|---|---|
| Body Configuration | Wafer (1), Lug (5) |
| Body Material | Ductile Iron (1), Cast Iron wafer (2), Aluminium Bronze (3), Carbon Steel (4), Aluminium NE-I wafer only (5), ENC Coated DI (6), Stainless Steel (8) |
| Stem Material | 416 SS (1), 316 SS (2), Monel (3) |
| Disc Material | 316 SS (2), Monel (3), Aluminium (4), Ductile Iron (5), Vented (6), Solid SS (9), Alloy 20 (7), Hastelloy C (8) |
| Seat Elastomer | Buna-N (31), Black Neoprene (32), Hypalon (33), Viton (34), Peroxide-Cured EPDM (35), Natural Rubber (36), White Neoprene (37), ETM-30230 (01), Fluorosteam (02), Peroxide-Cured Buna-N (03) |
| Actuation | Bare Shaft (—), 10-Position Locking Handle (14), 2-Position Locking Handle (64), Throttling Memory-Stop Handle (24), Square Nut (5), Worm-Gear Operator, Series DR Pneumatic Actuator |
Example DEMCO base part numbers in this series:
24680 (2″, 150 psi)24681 (2½″, 150 psi)24682 (3″, 150 psi)24683 (4″, 150 psi)24684 (6″, 150 psi)24685 (8″, 150 psi)24686 (10″, 150 psi)
For your RFQ, please specify: required size, pressure rating, body configuration (wafer or lug), body / stem / disc materials, seat elastomer, and required actuation. Indus Hydraulics will return an estimate against the corresponding DEMCO base part number.
Compliance & marking
- MSS SP-25 marking standard on every valve.
- Body rating to ASME Class 150 (285 psi non-shock).
- Wafer body diameters self-centre in ASME Class 150 flange patterns.
- Triple stem seal: hard-backed cartridge seat + integral flange seal + dual O-ring stem ribs in the seat bore.
Companion products
Manual handles, weatherproof worm-gear operators, and Series DR pneumatic actuators all interchange on this valve via the DEMCO top-flange standard. Compatible Indus SKUs include IH-VAL-BFLY-HDL-MEM, IH-VAL-BFLY-WGO, IH-VAL-BFLY-DR-DA. For automated installations, also see the position indicator switch, solenoid valve, pneumatic positioner, and seal-repair-kit accessories listed against the corresponding actuator product.
Identification
| Parameter | Value |
|---|---|
| Series | NEI-T |
| Body configuration | Wafer (short-neck) and Lug (long-neck) |
| Sanitary / FDA service | yes |
Dimensions
| Parameter | Value |
|---|---|
| Size range | 2″ – 10″ (50 – 250 mm) |
Performance
| Parameter | Value |
|---|---|
| ASME pressure class | ASME Class 150 (285 psi non-shock body rating) |
| Drop-tight shut-off ratings | 150 psi (drop-tight) |
| Operating temperature range | +20°F to +275°F (−7°C to +135°C) — Teflon liner inert across the range |
| Vacuum rating | 29.9 in Hg (sealed against 10 microns) |
| End-of-line service capable | no |
| Flow coefficient Cv (full open) | 145 (2″) → 5,000 (10″) |
| Actuation options | Sanitary or corrosion-resistant lever handles, weatherproof worm-gear operators, Series DR pneumatic actuators |
Compliance
| Parameter | Value |
|---|---|
| End-connection / flange standard | ASME Class 125/150 flanges |
Construction
| Parameter | Value |
|---|---|
| Body material options | Ductile iron, gray iron (lug long-neck), aluminium bronze, carbon steel, aluminium (wafer only), 316 stainless steel, Hastelloy C |
| Stem material options | 316 stainless, Monel, Hastelloy C |
| Disc material options | 316 SS (polished or unpolished), Alloy 20, Hastelloy C |
| Seat elastomer options | Buna-N/Teflon (peroxide-cured), EPDM/Teflon (peroxide-cured or sulfur-cured) — virgin Teflon liner overlaying and bonded to elastomer cushion (Buna-N or EPT) |
Shipping & lead time
Lead TimeTypically dispatched within 14 working days.
OriginMade in USA
Is the NEI-T a wafer or lug butterfly valve?▾
Wafer (short-neck) and Lug (long-neck). Wafer bodies install between two flanges using through-bolts and self-centre in ASME Class 150 flange patterns. Lug bodies have threaded bolt holes. Specify the body configuration explicitly on your RFQ.
What sizes are available in the DEMCO NEI-T?▾
2″ – 10″ (50 – 250 mm). Larger bores (14"–36" / 350–900 mm) are covered by the Series NF-C product line — please request the NF-C series instead if you need 14" or larger.
Which shut-off pressure rating should I order?▾
150 psi (drop-tight). The 200 psi rating is the standard general-service shut-off and covers the majority of applications. The 285 psi rating is for higher-pressure liquid service. The 50 psi rating is selected when the application allows reduced shut-off pressure in exchange for substantially smaller actuator sizing — common in automated systems where actuator cost dominates. Throttling-rated valves do not provide drop-tight closure but offer the lowest operating torque for control-valve service.
How do I select the right seat elastomer?▾
Match the elastomer to your fluid and temperature: Buna-N is the general-purpose hydrocarbon and oil seat (0–180°F). EPDM is the recommended water-service elastomer (peroxide-cured, +20–275°F) and is also resistant to alkaline solutions. Viton is the premium chemical/high-temperature seat (+20–300°F). Hypalon is preferred in acid service. Refer to the DEMCO Material Selection Guide for chemical-specific compatibility — Indus Hydraulics will cross-check the elastomer against your service conditions during quote review.
How do I select the right body and disc material?▾
Body material is driven by line-fluid corrosivity and pressure: ductile iron is the volume choice; bronze, stainless steel, aluminium and aluminium-bronze cover progressively more aggressive fluids; nickel-plated and PVF-coated ductile iron variants extend ductile iron's chemical service. Disc material should match the body material's corrosion class — DEMCO discs are available in 316 SS, Monel, aluminium, bronze, ductile iron (nickel-plated or PVF-coated), Alloy 20 and Hastelloy C. Indus Hydraulics will recommend a body/disc pairing on your RFQ once you confirm the line fluid and temperature.
Can this valve be automated?▾
Yes. The DEMCO top-flange is dimensionally compatible with competitive butterfly valves, so any DEMCO 10-position locking handle, 2-position locking handle, memory-stop throttling handle, square-nut handle, weatherproof worm-gear operator, or Series DR double-acting / spring-return pneumatic actuator can be fitted in the field. With the optional "utility top" stem the valve also accepts third-party actuators without modification — useful when replacing a competitive valve in an existing automated installation.
Is this valve fire-safe / NACE / API 607 rated?▾
No — the DEMCO NE/NF/NEI series is a resilient-seated process butterfly valve and does not carry API 607 fire-safe certification or NACE MR0175 certification. For fire-safe or sour-service applications, Indus Hydraulics carries triple-offset metal-seated butterfly valves under the Cameron oilfield valve product line — please request the oilfield butterfly valve series instead.
Is end-of-line service supported?▾
End-of-line service is not supported on this body style. The NEI-T is supplied wafer-only and requires both upstream and downstream flanges to constrain the valve in service. For end-of-line service requirements, specify the lug-body NE-C, NE-I or NF-C product line instead.
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