Valves and flow control
Butterfly valve
Isolation or control with a compact quarter-turn design
Engineering digital twin
Configure, inspect and review the valve
Wafer butterfly valve with resilient seat and manual operator
A56 mm
B203 mm
C216 mm
Flow state:Open
ClosedPartly openOpen
Dimensions and weights are sourced from the official Series 22/23 table and must be checked against wafer or lug body style and flange drilling for final selection.
Specialist selection guide
What should be reviewed before selecting this valve?
A butterfly valve is a quarter-turn valve with a rotating disc. Its low weight, short face-to-face dimension and actuator compatibility make it common in medium and large sizes. Concentric, double-offset and triple-offset designs have different sealing behaviour and pressure-temperature capabilities and are not automatically interchangeable.
Technical selection path
- 1
Choose wafer, lug or double-flanged construction for the installation and line-isolation requirement
- 2
Select concentric, double-offset or triple-offset geometry for pressure, temperature and leakage duty
- 3
Check fluid velocity, cavitation and torque across the operating range
- 4
Match elastomer liner or metal seat to the fluid and temperature
- 5
Verify disc sweep clearance and flange inside-diameter compatibility
Key strengths
- Lower weight and shorter installation length than many same-size valves
- Well suited to large sizes and electric or pneumatic actuation
- Suitable for isolation and, with appropriate design, throttling
Selection limitations
- The disc always occupies part of the flow path
- Flange or pipe geometry can interfere with disc movement
- Liner and seat require careful temperature and chemical compatibility checks
Typical applications
Where can this option be considered?
- Industrial water, cooling water and utility systems
- Large lines with weight and installation-space constraints
- Actuated isolation or flow-control systems
Reference standards
A standard does not replace the project specification
Common technical questions
Concise answers before enquiry
How do wafer and lug butterfly valves differ?
A wafer valve is clamped between two flanges and is not always suitable for one-sided line isolation. A lug valve has independent threaded lugs and, when specifically designed and rated, may be considered for some dead-end arrangements.
When does triple-offset design become important?
Triple-offset geometry can be considered for higher pressure-temperature duties, metal seating and reduced rubbing during operation. Actual limits must be verified from manufacturer documentation.
Medium and large sizes, water, utilities and many process services
Seat design, offset, disc-to-pipe clearance and permitted velocity
Initial review sheet
Technical attributes to review
Final values must come from project specifications, calculations and manufacturer data. This table defines the information scope.
FamilyManual and mechanical valves
Main groupValves and flow control
Materials to evaluateCarbon steel, Stainless steel, Alloy steel, Cast and ductile iron, Bronze and brass, Special alloys
Connections to evaluateFlanged, Butt-weld, Socket-weld, Threaded, Wafer and lug
Typical mediaProcess liquids, Gas, Steam, Water, Corrosive fluids
Relevant industriesOil and gas, Refining, Petrochemical, Power generation, Water and utilities
Reference standardsASME B16.34 · ASME B16.10 · API 6D · API 600 · API 602 · API 609 · API 598
Enquiry checklist
Include this information with your request
Valve duty
Class and design pressure
Temperature and fluid
Body, trim and seat materials
End connection and face-to-face
Leakage class
Before substitution
A matching name does not guarantee interchangeability
Installation dimensions, pressure rating, wetted materials, sealing design, construction standard, testing and documentation must be checked independently.
Adjacent types
Other options in this family
Final technical approval is required
This page is educational and intended for initial screening. Final selection must be approved against project requirements, actual service conditions and manufacturer documentation.
Send request for review