8 Inch Butterfly Valves (DN200)

8 inch butterfly valves are quarter-turn industrial valves designed for isolating, throttling, and automating flow in NPS 8 / DN200 piping systems. They are widely used in municipal water systems, process piping, wastewater infrastructure, HVAC utilities, and industrial plant service where compact installation and efficient automation are required.

BPC supplies 8 inch butterfly valves in wafer, lugged, flanged, and stainless steel configurations — available with manual, pneumatic, and electric actuation for demanding industrial and utility service.

What Is an 8 Inch Butterfly Valve?

An 8 inch butterfly valve is a rotary flow control valve installed in NPS 8 piping systems, corresponding to DN200 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.

How an 8 Inch Butterfly Valve Works

Valve Position	Disc Orientation	System Effect
Fully Open	Parallel to flow	Maximum flow through valve
Partially Open	Angled in flow path	Flow throttling
Fully Closed	Perpendicular to flow	Shutoff against seat

Common 8 Inch Butterfly Valve Configurations

Wafer — Compact installation between ANSI or DIN flanges using through-bolts. Meets ANSI B16.10 / ISO 5752 narrow face-to-face. Lowest installed weight and space requirement.

Lugged — Threaded inserts allow independent bolting to each flange, supporting dead-end service and downstream maintenance without full line shutdown.

Flanged — Heavy-duty end connections for demanding industrial service, including ANSI Class 150 and Class 300 applications.

Stainless Steel — 316SS body and disc for corrosion resistance in chemical transfer, process water, and aggressive media service.

Automated — Pneumatic or electric actuator packages with ISO 5211 direct-mount interface for remote operation and SCADA integration.

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8 Inch Butterfly Valve Technical Specifications

Parameter	Specification
Nominal Size	NPS 8 / DN200
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	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]

Key Benefits

Compact footprint — ANSI B16.10 narrow face-to-face reduces space and installation cost vs. gate or globe valves at equivalent bore
Lower installed weight — Lighter than gate or ball valves at DN200, reducing structural support requirements
Fast quarter-turn operation — 90-degree travel enables rapid manual or actuated response
Automation-ready — ISO 5211 top flange supports direct-mount pneumatic and electric actuators
NSF certified — Potable water configurations certified to NSF/ANSI/CAN 61

Applications

Application	Typical Function	Key Selection Consideration
Municipal Water	Distribution isolation	NSF certification, pressure class
Wastewater Systems	Process isolation	Corrosion resistance, seat compatibility
Cooling Water Systems	Utility flow control	Automation compatibility
Chemical Transfer	Isolation and batching	Seat and disc material compatibility
Tank Systems	Inlet / outlet control	Lug-style for dead-end service
Industrial Utilities	Plant service shutoff	Installed footprint, actuator interface

BPC’s applications team can confirm material selection, actuator sizing, and flange compatibility for your system.

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Selection Considerations

Flange Standards — Confirm ANSI B16.5 (Class 150 or 300) or DIN drilling compatibility. Wafer and lug styles must match the adjacent flange bolt circle.
Media Compatibility — EPDM is standard for water and mild process service; Viton (FKM) suits hydrocarbon and elevated-temperature service; PTFE suits chemical and aggressive media. All materials should conform to applicable ASTM standards for the body type specified.
Pressure and Temperature — Evaluate maximum operating pressure, surge/water hammer conditions, and differential pressure at shutoff against the 150 PSI / 70°F non-shock rating.
Actuation and Torque — At NPS 8 / DN200, operating torque requires careful actuator sizing. BPC provides actuator sizing support for pneumatic and electric valve packages.
Maintenance Access — Lug bodies support downstream line removal without disturbing the upstream flange. Wafer bodies require both flanges to remain in place during valve removal.

8 Inch Butterfly Valve vs. Other Valve Types

Valve Type	Best Fit	Main Advantage	Main Limitation
Butterfly Valve	Larger utility piping	Compact, lightweight, automation-ready	Disc remains in flow path
Ball Valve	Tight shutoff	Full-port, low pressure drop	Higher cost and weight at large sizes
Gate Valve	Full-bore isolation	Unrestricted flow when open	Larger installed footprint
Globe Valve	Precision throttling	Better control characteristics	Higher pressure drop

Related Butterfly Valve Sizes

Valve Size	Metric Equivalent	Typical Applications
3 Inch	DN80	OEM systems and utility sub-mains
4 Inch	DN100	HVAC, process water, plant utilities
6 Inch	DN150	Wastewater, cooling water, distribution
8 Inch	DN200	Municipal and industrial piping
10 Inch	DN250	Large-diameter process and utility mains

FAQ: 8 Inch Butterfly Valves

Why are 8 inch butterfly valves popular in municipal water systems?

They combine compact ANSI B16.10 face-to-face dimensions with reliable quarter-turn shutoff, NSF/ANSI/CAN 61 certification for potable water service, and straightforward actuator integration — keeping installed weight and maintenance complexity well below gate valve alternatives at DN200 sizing.

Can an 8 inch butterfly valve be electrically actuated?

Yes. Electric actuators mount directly via ISO 5211 flange and support both on/off and modulating control. BPC automated configurations are available for remote operation and SCADA integration.

Are 8 inch butterfly valves suitable for tank farms?

Yes. Lug-style configurations are preferred for tank service because they support dead-end shutoff and allow downstream disconnection without disturbing the tank-side flange.

What seat materials are available for 8 inch butterfly valves?

EPDM (standard water and utility service), NBR (petroleum-based media), Viton/FKM (elevated temperature and hydrocarbon), and PTFE (chemical and aggressive process fluids).

Do 8 inch butterfly valves require gear operators?

Manual operation at NPS 8 typically requires a worm gear operator because torque increases with valve size and line pressure. Gear operators reduce handwheel effort and improve throttling control.

What is the Cv of an 8 inch butterfly valve?

Cv varies by manufacturer and disc geometry. BPC 8 inch butterfly valves have a Cv of [value] at full open — contact our applications team for sizing assistance.

About BPC

BPC supplies industrial butterfly valves to municipal water systems, process facilities, wastewater infrastructure, and industrial plant operations. Our 8 inch butterfly valve inventory includes wafer, lugged, flanged, and stainless steel configurations with manual 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.

Conclusion

8 inch butterfly valves provide reliable, compact, and automation-ready flow control for NPS 8 / DN200 industrial piping. Selecting the correct valve requires evaluating pressure rating, body style, seat material, flange standard, Cv requirements, and actuation. BPC supports industrial butterfly valve applications with configurations engineered for demanding municipal and industrial service.