Butterfly Valves

Compact and efficient butterfly valves for large-scale flow control and isolation.

Wafer Type Butterfly Valve - Wafer type butterfly valve for compact installations

Wafer Type Butterfly Valve

Lightweight wafer design that fits between flanges for space-saving installation.

Technical Specifications
Lug Type Butterfly Valve - Lug type butterfly valve for end-of-line service

Lug Type Butterfly Valve

Threaded lug design allowing removal of downstream piping without disturbing the system.

Technical Specifications
Double Flanged Butterfly Valve - Double flanged butterfly valve for large diameter pipelines

Double Flanged Butterfly Valve

Heavy-duty flanged design for high-pressure and critical service applications.

Technical Specifications
Triple Offset Butterfly Valve - Triple offset butterfly valve for zero-leakage critical duty

Triple Offset Butterfly Valve

Metal-seated, zero-leakage design for high-temperature and high-pressure applications.

Technical Specifications

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Frequently Asked Questions

Technical questions about Butterfly Valves - selection, materials, standards & ordering

Concentric, double-offset, and triple-offset butterfly valves - what is the difference?+

Concentric (centric) butterfly valves have the shaft running through the disc centre with a rubber elastomer seat - simple, low-cost, suitable for water and HVAC up to 200°C (limited by elastomer). Double-offset (high-performance) butterfly valves move the shaft behind the disc centreline, reducing seat rubbing and allowing PTFE soft seats for tighter shut-off and higher temperatures to 260°C. Triple-offset butterfly valves add a third geometric offset creating a cam-action, friction-free closure - the metal-to-metal seat provides ANSI Class VI (bubble-tight) shut-off from -196°C to +815°C and is inherently fire-safe.

What does API 609 Category A vs. Category B mean?+

API 609 covers butterfly valves for general refinery and petrochemical service. Category A includes wafer and lug types (clamped between flanges) - applicable to lug-body designs used in dead-end service and most standard applications. Category B covers double-flanged designs with raised face or ring joint flanges, rated for higher pressures and temperatures. Category B also requires more stringent testing - including seat leak test per API 598 - making it the specification of choice for critical or high-integrity shutoff requirements.

Are butterfly valves fire-safe?+

Triple-offset butterfly valves with metal-to-metal seats are inherently fire-safe - there are no elastomers to burn. Concentric and double-offset designs with elastomer or PTFE seats are NOT fire-safe in their standard form; fire-safe versions with secondary metal seat rings and graphite stem seals are available and tested to API 607. If your process handles flammable or combustible fluids, always specify API 607 fire-tested butterfly valves or use triple-offset metal-seated designs.

What is the maximum size available for butterfly valves?+

Standard production butterfly valves are available up to DN1200 (48") for double-flanged and triple-offset designs. Concentric wafer and lug designs are typically available to DN600 (24") in stocked production; larger sizes up to DN1200 on request. For special requirements above DN1200 - such as large dam, power plant inlet, or water authority trunk main applications - please contact our engineering team for a bespoke quotation.