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4 inch butterfly valves are quarter-turn industrial valves designed for isolating, regulating, and automating flow in NPS 4 / DN100 piping systems. Their compact design, lower operating torque, and fast operation make them widely used in water treatment, HVAC, wastewater, process piping, compressed air systems, and industrial automation applications.
BPC supplies 4 inch butterfly valves in wafer, lugged, flanged, high-performance, and PTFE-lined configurations — available with manual, pneumatic, and electric actuation for demanding industrial and utility service.
A 4 inch butterfly valve is a rotary flow control valve installed in NPS 4 piping systems, corresponding to DN100 metric sizing under ISO and DIN standards. The valve operates through a rotating disc mounted on a central shaft. A 90-degree disc rotation moves the valve between fully open and fully closed, providing fast, automation-ready shutoff with a compact face-to-face footprint per ANSI B16.10 / ISO 5752 narrow face-to-face dimensions.
| Valve Position | Disc Orientation | System Effect |
|---|---|---|
| Fully Open | Parallel to flow | Maximum flow capacity |
| Partially Open | Angled in flow path | Flow regulation |
| Fully Closed | Perpendicular to flow | Shutoff against valve seat |
Wafer — Compact installation between ANSI or DIN flanges using through-bolts. Meets ANSI B16.10 / ISO 5752 narrow face-to-face. Economical and widely stocked for standard utility and process applications.
Lugged — Threaded inserts allow independent bolting to each flange, supporting dead-end service and downstream maintenance without full line shutdown.
Flanged — Integral flanged ends provide stronger mechanical support for demanding piping systems and heavier industrial service.
High-Performance — Double-offset or triple-offset disc geometry for elevated pressure ratings, higher cycle rates, and improved shutoff performance in demanding process applications.
PTFE-Lined — Full PTFE lining on disc and body contact surfaces for corrosive chemical service requiring enhanced chemical compatibility beyond standard elastomer seats. Configure a PTFE-Lined Valve →
| Parameter | Specification |
|---|---|
| Nominal Size | NPS 4 / DN100 |
| Face-to-Face | Per ANSI B16.10 / ISO 5752 Narrow |
| Flange Drilling | ANSI B16.5 Class 150 / Class 300; DIN PN10 / PN16 |
| Pressure Rating | 150 PSI / 10 Bar at 70°F (21°C), Non-Shock |
| Temperature Range | -4°F to 250°F (-20°C to 121°C) depending on seat material |
| Cv Flow Coefficient | [Value] at full open |
| Body Material | Ductile Iron; per applicable ASTM standards |
| Disc Material | Ductile Iron, 316 Stainless Steel |
| Seat / Liner | EPDM, NBR, Viton (FKM), PTFE |
| Stem Material | 316 Stainless Steel |
| Actuator Mounting | ISO 5211 Direct Mount |
| Operation | Lever, Gear Operator, Pneumatic Actuator, Electric Actuator |
| Certifications | NSF/ANSI/CAN 61 (potable water configurations) |
| Warranty | [X]-Year Limited Warranty |
| Origin | Manufactured in [USA / country of origin] |
| Application | Typical Function | Key Selection Consideration |
|---|---|---|
| Water Distribution | Isolation and flow control | Pressure class, NSF certification |
| Wastewater Systems | Process isolation | Corrosion resistance, seat compatibility |
| HVAC Systems | Balancing and shutoff | Low torque, compact design |
| Chemical Transfer | Batch isolation | PTFE lining or Viton seat compatibility |
| Process Skids | Automated shutoff | ISO 5211 actuator interface |
| Bulk Utility Systems | Utility isolation | Lug-style for dead-end service |
| Valve Type | Best Fit | Main Advantage | Main Limitation |
|---|---|---|---|
| Butterfly Valve | Compact automation-ready flow control | Lightweight, economical, fast operation | Disc remains in flow path |
| Ball Valve | Full-port shutoff | Minimal pressure drop | Larger installed size at higher flow rates |
| Gate Valve | Full-bore isolation | Unrestricted flow when open | Slow operation, larger footprint |
| Globe Valve | Precision throttling | Better control accuracy | Higher pressure drop |
| Pinch Valve | Abrasive slurry handling | Sleeve isolation from process | Limited by sleeve material |
| Valve Size | Metric Equivalent | Typical Applications |
|---|---|---|
| 3 Inch | DN80 | OEM systems and utility sub-mains |
| 4 Inch | DN100 | HVAC, process water, and plant utilities |
| 6 Inch | DN150 | Wastewater and plant utilities |
| 8 Inch | DN200 | Municipal and industrial piping |
| 10 Inch | DN250 | Large-diameter process and utility mains |
4 inch butterfly valves are used across water treatment, HVAC, manufacturing, wastewater, chemical processing, and process utility systems. At DN100 sizing, they are a practical fit for process skids, utility headers, and equipment isolation where compact installation and automation compatibility are priorities.
Yes. Outdoor installations should specify corrosion-resistant body coatings, stainless steel external hardware, and weather-protected or NEMA-rated actuator enclosures. Seat and disc material selection should also account for ambient temperature extremes and UV exposure for exposed actuator components.
Yes. They are widely used in condenser water, chilled water, and process cooling applications. EPDM-seated configurations are standard for cooling water service; NSF/ANSI/CAN 61 certified configurations are available where potable water compliance is required.
Both pneumatic and electric actuators are common at NPS 4 / DN100. Pneumatic actuators are preferred in facilities with available instrument air and where fast fail-safe response is required. Electric actuators suit applications requiring modulating control or where compressed air is unavailable. All BPC actuated configurations include ISO 5211 direct-mount interface.
Yes, provided seat, disc, and body materials are selected for the media, solids exposure, and any chemical treatment present. EPDM or NBR seats are standard for wastewater service; higher-performance elastomers or PTFE linings may be required for chemically aggressive streams.
Yes. Properly specified butterfly valves perform reliably in frequent cycling applications. High-performance configurations with reinforced seats and metal disc options extend cycle life in demanding automated service. Actuator sizing and seat material selection are the most critical factors for long cycle life.
BPC supplies industrial butterfly valves to water treatment facilities, HVAC systems, process plants, chemical operations, and industrial utilities. Our 4 inch butterfly valve inventory includes wafer, lugged, flanged, high-performance, and PTFE-lined configurations with manual lever, gear, pneumatic, and electric actuator options — backed by a [X]-year warranty and supported by an applications engineering team experienced in valve sizing and industrial specification.
4 inch butterfly valves provide compact, reliable, and automation-ready flow control for NPS 4 / DN100 industrial piping systems. Selecting the correct valve requires evaluating pressure rating, body style, seat material compatibility, Cv requirements, and actuation method. BPC supports industrial butterfly valve applications with configurations engineered for demanding process and utility service.
