DEMCO Series NE-C General-Purpose Butterfly Valve, 2″–12″
Butterfly ValvesLead time · 14 days
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DEMCO Series NE-C General-Purpose Butterfly Valve, 2″–12″Long-neck general-purpose resilient-seated butterfly valve for chemical, oil & gas, water, HVAC and industrial process service. Long neck clears 2 inches of insulation on the pipe.
Key features
- Series: NE-C
- Body configuration: Wafer and Lug
- ASME pressure class: ASME Class 150 (285 psi non-shock body rating)
- Series
- NE-C
- Body configuration
- Wafer and Lug
- Sanitary / FDA service
- no
- Size range
- 2″ – 12″ (50 – 300 mm)
- ASME pressure class
- ASME Class 150 (285 psi non-shock body rating)
- Operating temperature range
- −30°F to +300°F (−34°C to +149°C) — depends on selected elastomer
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Product description
The DEMCO Series NE-C is the long-neck, general-purpose member of the DEMCO resilient-seated butterfly valve family. The longer neck length is engineered to provide full clearance of the valve top over two inches of insulation on ASME Class 150 pipe flanges, making it the default selection for insulated process lines, steam-jacketed systems, and any installation where the valve top must clear lagging or cladding. Available in both wafer and lug body styles, in sizes 2″ through 12″, with the full DEMCO range of body / stem / disc materials and seat elastomers. Bi-directional sealing at full rated pressure, with three drop-tight shut-off ratings (200 / 285 / 50 psi) and a throttling option for control-valve service.
Construction
- Body configurations: Wafer and Lug
- Size range: 2″ – 12″ (50 – 300 mm)
- End connections: ASME Class 125/150 flanges (raised- or flat-face)
- Body materials: Cast iron (wafer), ductile iron (lug), aluminium bronze, carbon steel (WCB), aluminium, ENC nickel-plated ductile iron, 316 stainless steel (CF8M), PVF-coated ductile iron
- Stem materials: 416 stainless, 316 stainless, Monel — utility-top option for actuator interchangeability
- Disc materials: 316 SS (CF8M), Monel (M30C), aluminium, bronze, ductile iron, ENC nickel-plated ductile iron, vented, solid SS, Alloy 20 (CN-7M), Hastelloy C (CW-2M), aluminium bronze, PVF-coated ductile iron
- Seat elastomers: Buna-N, Black Neoprene, Hypalon, Viton, EPDM (peroxide-cured), Natural Rubber, White Neoprene, ETM-30230, Fluorosteam, Peroxide-Cured Buna-N
- 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: 200 psi (standard), 285 psi (high-pressure), 50 psi (low-torque), Throttling.
- Vacuum: Sealed against 10 microns of vacuum (29.9 in Hg).
- Temperature range: −30°F to +300°F (−34°C to +149°C) — depends on selected elastomer.
- Bi-directional sealing: Identical drop-tight closure from either flow direction.
- End-of-line service: Lug body suitable for end-of-line service with downstream piping removed (weld-neck or socket flanges only).
- Flow coefficient (Cv at 90° open): 145 (2″) → 7,500 (12″).
Engineered features
- Long neck clears 2″ of insulation on ASME Class 150 flanges — eliminates handle/actuator clearance issues on lagged piping
- One-piece body for minimum weight and maximum strength
- Hard-backed cartridge seat — bonds resilient elastomer to a rigid backing ring; field-replaceable with no special tools
- Triple stem seal: integral flange seal + hard-backed seat + dual O-ring ribs in stem bore (eliminates stem leakage path that is common to "boot-seat" competitive designs)
- Dry stem journal — continuous annular raised land around stem hole prevents fluid behind the seat
- Floating disc — perfectly centres in seat for prolonged service life and drop-tight closure
- Positive stem retention — blowout-proof stem
- Flatted "double-D" upper stem with large flange top — accepts the full DEMCO actuation range
- MSS SP-25 marking is standard
Typical applications
- Chemical and petrochemical process lines (insulated)
- Oil and gas drilling and production utilities
- Steam-jacketed and steam-traced piping
- Cooling towers and HVAC chilled-water service
- Power generation auxiliary systems
- Mining and minerals processing
- Water and waste-water treatment
- Marine and government service
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 Bronze (4), Ductile Iron Nickel-Plated (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:
22119 (2″, 200 psi)22124 (6″, 200 psi)22127 (12″, 200 psi)22230 (6″, 285 psi)22239 (6″, 50 psi)22248 (6″, throttling)
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-10P, IH-VAL-BFLY-HDL-MEM, IH-VAL-BFLY-WGO, IH-VAL-BFLY-DR-DA, IH-VAL-BFLY-STMX. For automated installations, also see the position indicator switch, solenoid valve, pneumatic positioner, and seal-repair-kit accessories listed against the corresponding actuator product.
Part numbers by size
Cameron part numbers we can supply in this series, grouped by size and body style, each with its body, disc, stem and seat:
- 2″ lug — 2 part numbers
- 3″ lug — 4 part numbers
- 4″ lug — 3 part numbers
- 5″ lug — 2 part numbers
- 6″ lug — 4 part numbers
- 8″ lug — 5 part numbers
- 12″ lug — 3 part numbers
- 16″ lug — 1 part number
- 2″ wafer — 6 part numbers
- 2½″ wafer — 1 part number
- 3″ wafer — 2 part numbers
- 4″ wafer — 4 part numbers
- 5″ wafer — 3 part numbers
- 6″ wafer — 2 part numbers
- 8″ wafer — 2 part numbers
- 12″ wafer — 4 part numbers
Identification
| Parameter | Value |
|---|---|
| Series | NE-C |
| Body configuration | Wafer and Lug |
| Sanitary / FDA service | no |
Dimensions
| Parameter | Value |
|---|---|
| Size range | 2″ – 12″ (50 – 300 mm) |
Performance
| Parameter | Value |
|---|---|
| ASME pressure class | ASME Class 150 (285 psi non-shock body rating) |
| Drop-tight shut-off ratings | 200 psi (standard), 285 psi (high-pressure), 50 psi (low-torque), Throttling |
| Operating temperature range | −30°F to +300°F (−34°C to +149°C) — depends on selected elastomer |
| Vacuum rating | 29.9 in Hg (sealed against 10 microns) |
| End-of-line service capable | yes |
| Flow coefficient Cv (full open) | 145 (2″) → 7,500 (12″) |
| Actuation options | Lever handles (10-position, 2-position, memory-stop, square nut), weatherproof worm-gear operators (handwheel/chainwheel/square nut/crank), Series DR double-acting and spring-return pneumatic actuators |
Compliance
| Parameter | Value |
|---|---|
| End-connection / flange standard | ASME Class 125/150 flanges (raised- or flat-face) |
Construction
| Parameter | Value |
|---|---|
| Body material options | Cast iron (wafer), ductile iron (lug), aluminium bronze, carbon steel (WCB), aluminium, ENC nickel-plated ductile iron, 316 stainless steel (CF8M), PVF-coated ductile iron |
| Stem material options | 416 stainless, 316 stainless, Monel — utility-top option for actuator interchangeability |
| Disc material options | 316 SS (CF8M), Monel (M30C), aluminium, bronze, ductile iron, ENC nickel-plated ductile iron, vented, solid SS, Alloy 20 (CN-7M), Hastelloy C (CW-2M), aluminium bronze, PVF-coated ductile iron |
| Seat elastomer options | Buna-N, Black Neoprene, Hypalon, Viton, EPDM (peroxide-cured), Natural Rubber, White Neoprene, ETM-30230, Fluorosteam, Peroxide-Cured Buna-N |
Shipping & lead time
Lead TimeTypically dispatched within 14 working days.
OriginMade in USA
Is the NE-C a wafer or lug butterfly valve?▾
Wafer and Lug. Wafer bodies install between two flanges using through-bolts and self-centre in ASME Class 150 flange patterns. Lug bodies have threaded bolt holes and can be used for end-of-line service with the downstream pipe removed (provided weld-neck or socket flanges are used upstream). Specify the body configuration explicitly on your RFQ.
What sizes are available in the DEMCO NE-C?▾
2″ – 12″ (50 – 300 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?▾
200 psi (standard), 285 psi (high-pressure), 50 psi (low-torque), Throttling. 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?▾
Yes — the lug-body variant of the NE-C is rated for end-of-line liquid service with the downstream piping removed, up to the standard 200 psi shut-off rating (150 psi for sizes 14" and larger). Only weld-neck or socket flanges may be used upstream — slip-on or threaded flanges are not supported in this configuration. Lug bodies are also recommended for isolation of pumps, control devices and any system component which may need to be removed for repair or replacement.
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