Butterfly Valve
A quarter-turn valve using a disc (butterfly) as the obturator. The disc rotates in the flow stream. Types: concentric (resilient seat, Class 150), double-offset (metal seat, Class 150–600), triple-offset (metal seat, tight shutoff, Class 150–900). Used in large-diameter (DN50–DN2000) on-off and throttling service.
Related Terms
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Applicable Standards
Fire Test for Quarter-Turn Valves and Valves Equipped with Nonmetallic Seats
API 607 is the fire-test standard for quarter-turn valves (ball valves and butterfly valves) and other valves with soft (non-metallic) seats and seals.
Butterfly Valves: Double-Flanged, Lug- and Wafer-Type
API 609 is the dimensional and performance standard for butterfly valves in petroleum and natural gas service.
Frequently Asked Questions
What is a Butterfly Valve?
A quarter-turn valve using a disc (butterfly) as the obturator. The disc rotates in the flow stream. Types: concentric (resilient seat, Class 150), double-offset (metal seat, Class 150–600), triple-offset (metal seat, tight shutoff, Class 150–900). Used in large-diameter (DN50–DN2000) on-off and throttling service.
What is a Butterfly Valve used for?
Butterfly Valves are used in industrial piping systems for on-off isolation, flow control, or backflow prevention depending on the valve type. They are selected based on the process fluid, operating pressure and temperature, required shutoff class, and pipeline size. Vajra Industrial Solutions supplies Butterfly Valves certified to API 6D, ASME B16.34, and other applicable standards.
How do I select the right Butterfly Valve for my application?
Selecting the correct Butterfly Valve requires specifying: (1) nominal pipe size (NPS/DN), (2) pressure class per ASME B16.34, (3) body and trim material based on fluid compatibility and temperature, (4) end connections (flanged RF/RTJ, butt-weld, socket-weld, or threaded), (5) required certifications (API 6D, ISO 9001, fire-safe API 607). Contact Vajra Industrial Solutions at sales@vajravyuh.com with your specifications for a quote.
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