Butterfly valves for large-bore isolation and control
Resilient, double offset and triple offset designs, 2" to 72", wafer, lug and flanged.
Overview
Butterfly valves are compact, light and economical in large sizes, which is why they dominate water treatment, cooling water, desalination and HVAC lines. Metal-seated triple offset designs extend the same geometry to high-temperature and hydrocarbon service, with zero-leakage shut-off and fire-safe certification.
We supply resilient-seated valves with EPDM, NBR and PTFE liners for water and mild chemical service, double offset high-performance valves for general process duty, and triple offset valves to API 609 Category B for steam, hot oil and hydrocarbons.
Bodies are available in ductile iron, carbon steel, stainless steel and duplex, with discs in stainless, aluminium bronze or super duplex for seawater. Gear operators are standard above 8"; electric and pneumatic actuation packages are assembled and tested in Al Hakim's Dubai workshop.
See how a butterfly valve works in the interactive Valve Lab.
Typical applications
- Cooling-water intake, circulation and discharge
- Desalination and seawater systems
- Water treatment and distribution
- Hydropower penstock and pump isolation
- Steam, hot oil and hydrocarbon isolation (triple offset)
- HVAC and fire-water networks
Specified in power & heavy industry, hydropower & water, cement & process plants, petrochemicals.
Specifications
| Designs | Concentric resilient seated · double offset (high performance) · triple offset metal seated |
|---|---|
| Sizes | 2" – 72" (DN50 – DN1800) |
| Pressure classes | PN10 · PN16 · PN25 · ASME 150 · 300 · 600 |
| Body materials | Ductile iron · A216 WCB · A351 CF8M · duplex · super duplex |
| Seat / liner | EPDM · NBR · PTFE · RPTFE · laminated metal (triple offset) |
| Design standards | API 609 · EN 593 · ISO 5752 · ASME B16.34 |
| Testing | API 598 · EN 12266 · API 607 / 6FA fire-safe (triple offset) |
| End connections | Wafer · lug · double flanged · butt weld |
Sizes, classes and materials listed are typical of our stock and supply programme. Other combinations are quoted against your specification. See what is usually ex-stock.
Specifying the right butterfly valve
Butterfly valves win on size: above 8" they are a fraction of the weight and cost of a gate or ball valve, which is why they dominate cooling water, desalination, fire water, HVAC and large utility lines. Choose the design by the service. A concentric, resilient-seated valve (API 609 Category A, EPDM or NBR liner) handles water and air to Class 150 and gives bubble-tight shut-off at low cost. A double-offset high-performance valve (Category B) with a PTFE or metal seat extends the range to Class 300 and hotter fluids. A triple-offset metal-seated valve seals with a non-rubbing cone-in-cone contact and gives zero leakage on steam, hydrocarbons and high temperature to Class 600, which qualifies it as an isolation valve in refineries and power stations.
Specify the body style with the piping: wafer between flanges where the valve is never at the end of a line, lug for dead-end service, double-flanged for large sizes and buried pipelines (AWWA C504 for water). Check the disc and seat material against the fluid, state the shut-off class required (API 598 or ISO 5208 rate), and give the actuator duty if the valve is to be automated, as triple-offset valves need higher torque than their size suggests.
What to send us for a fast quote
- Size and class
- Design: resilient seated, double offset, triple offset
- Body style: wafer, lug, double flanged
- Body, disc, seat and liner material
- Shut-off requirement and temperature
- Operator: lever, gear, actuator; documents required
Why tenders get rejected, and how we avoid it
Butterfly valve tenders for Pakistani power and water projects usually call for API 609 with a stated category and a seat leakage class; bids that quote a resilient-seated valve against a triple-offset line item, or that omit the seat test report, are set aside. We quote the category the specification asks for and attach the manufacturer's API 609 licence, authorisation letter and test certificates. More on API licences, authorisation letters and certificates.
Brands available
Supplied from the manufacturers below, through our sister company Al Hakim in Dubai. Country of origin is confirmed on the certificates of every supply.
Documentation supplied
EN 10204 3.1 material test certificate traceable to heat number, API 598 pressure test report per serial number, certificate of origin and manufacturer's certificate of conformity, with NACE, fire-safe, 3.2 and third-party inspection documents where the order requires them. What every document in our package covers.
Frequently asked questions
What is a triple offset butterfly valve?
The disc and seat are machined as a cone with three geometric offsets, so the disc lifts off the seat without rubbing. This gives metal-to-metal, zero-leakage shut-off suitable for high temperature and fire-safe service.
Wafer or lug body?
Wafer valves sit between two flanges and are cheaper. Lug valves have threaded holes so the downstream pipe can be removed with the valve still holding pressure, which is needed for end-of-line and maintenance isolation.
Do you supply large-diameter butterfly valves for hydropower?
Yes, double flanged valves up to 72" with gear or hydraulic operation and counterweights where required.
Butterfly valve vs gate valve for large water lines?
Butterfly, almost always. Above 8" it costs and weighs far less, is quicker to operate and fits in less space. Gate valves keep a clear bore for pigging and have lower pressure drop, which is why they remain standard on pipelines and pump suctions.
When do I need a triple-offset valve?
When the valve must isolate steam, hot oil, hydrocarbons or any fluid above the limits of a rubber or PTFE seat, or when a bi-directional zero-leakage shut-off is specified. For water, air and other utility service a resilient-seated valve is sufficient and much cheaper.
Related products
For the gate, globe and check valves that make up the rest of a cooling-water or penstock station, see those product pages; for automated packages with electric or pneumatic actuators, see actuated valves.
Gate valves
Full-bore isolation with minimal pressure drop. API 600 cast steel and API 602 forged steel, 2" to 48".
Sizes, classes and brands
Actuated valves
Valves with electric or pneumatic actuators, function-tested as complete packages, including ESD.
Sizes, classes and brands
Check valves
Swing, dual plate, piston and tilting-disc designs. API 594, API 6D and BS 1868, ½" to 48".
Sizes, classes and brands
Gaskets
Spiral wound, ring joint, kammprofile and non-asbestos sheet gaskets to ASME B16.20 and B16.21.
Sizes, classes and brandsRequest a quotation for butterfly valves
Send size, class, material, quantity and required documents on WhatsApp or through the form. We reply within one working day with availability and lead time.