Lug Type Butterfly Valve
Threaded lug design allowing removal of downstream piping without disturbing the system.
Technical Specifications
| Type | Lug (Threaded Lugs) |
| Size Range | 2" to 36" (50 mm to 900 mm) |
| Body Materials | DI, CI, Carbon Steel, Stainless Steel |
| Disc Material | SS304, SS316, Aluminum Bronze |
| Seat Material | EPDM, NBR, PTFE, Viton |
| End Connections | Lug (tapped holes) |
| Pressure Rating | PN10 / PN16, Class 150 |
| Standards | API 609, EN 593 |
Applications
Dead-end service, water systems, process isolation
About the Lug Type Butterfly Valve
The lug type butterfly valve features a valve body with threaded inserts (lugs) cast integrally around its perimeter that accept separate bolts from each pipe flange independently. This dual independent bolting arrangement is the key difference from a wafer butterfly valve: because each flange bolts directly to the lug without depending on through-bolts that span across both flanges, downstream piping can be disconnected and removed with the valve remaining in place and the upstream system fully pressurised. This dead-end service capability makes lug butterfly valves mandatory at pipeline termination points, equipment connections where maintenance involves removing downstream spools, and any location where one-sided disassembly is needed.
The lug body can also function as the end-of-line connection when the valve is at the terminal point of a pipeline or equipment nozzle - the valve body itself provides structural support to the piping without requiring downstream spool pieces. In dead-end position (closed, with downstream pipe removed), the lug butterfly valve must support full line pressure on the disc and seat; some designs are limited in dead-end pressure rating, so always confirm the manufacturer's dead-end pressure rating. Vajra Industrial Solutions supplies lug butterfly valves in sizes 2" to 36" in Ductile Iron, Carbon Steel, and Stainless Steel to API 609 and EN 593 with all standard seat materials.
Where It's Used
Key industries and applications for the Lug Type Butterfly Valve
Pump discharge connections
lug butterfly valves as the isolating valve between pump discharge flange and the downstream process pipe; allows pump removal for maintenance without draining the entire downstream system
Equipment and vessel nozzle connections
lug butterfly valves at the inlet or outlet nozzles of tanks, vessels, heat exchangers, and filter housings; dead-end service allows equipment isolation and removal while the upstream line remains in service
Fire protection dead-end service
UL/FM listed lug butterfly valves at dead-end sprinkler main connections, riser isolation, and hose cabinet connections; dead-end pressure rating must meet system design pressure
Water distribution and treatment
Ductile Iron lug butterfly valves on water treatment plant filter outlet headers and distribution main dead-ends; EPDM seat for potable water compliance (NSF/ANSI 61)
Modular skid and package plant connections
SS316 or Ductile Iron lug butterfly valves at module interconnect flanges; allows skid sections to be disconnected for maintenance without draining adjacent modules
How to Choose the Right Lug Type Butterfly Valve
Specify a lug butterfly valve over a wafer type whenever: (a) dead-end service is required (downstream pipe may be disconnected while the valve is in place and upstream pressure is maintained); (b) the valve is at a pipeline termination or equipment nozzle end point; or (c) the piping specification requires that maintenance workers can disconnect downstream sections safely. Verify the dead-end pressure rating from the manufacturer - it may be lower than the full bidirectional PN rating. Seat selection follows the same rules as for wafer butterfly valves.
Popular Configurations
Most commonly ordered specifications for the Lug Type Butterfly Valve
Frequently Asked Questions
About Lug Type Butterfly Valve - ordering, specs, delivery & compliance
What standards does the Lug Type Butterfly Valve comply with?+
Our Lug Type Butterfly Valve complies with API 609, EN 593. All products are manufactured to international standards and come with full material test reports (MTR), dimensional inspection reports, and hydrostatic test certificates on request.
What materials are available for the Lug Type Butterfly Valve?+
The Lug Type Butterfly Valve is available in DI, CI, Carbon Steel, Stainless Steel. Material selection depends on your process fluid, temperature, pressure, and corrosion requirements.
What is the delivery lead time for Lug Type Butterfly Valve?+
Standard stock sizes are available for immediate dispatch from our Vadodara warehouse. Custom sizes and special materials typically have a lead time of 2–6 weeks depending on specifications. We serve customers across India within 1–7 business days and export to the Middle East, Southeast Asia, Europe, and the Americas with full export documentation.
Can I get a custom Lug Type Butterfly Valve for a specific application?+
Yes. Vajra Industrial Solutions supplies custom-engineered butterfly valves for specific process conditions. Submit your technical requirements - including pressure class, temperature range, fluid type, end connections, and any special trim or coating needs - via our RFQ form or WhatsApp, and our engineering team will respond within 24 hours.
What pressure ratings are available for the Lug Type Butterfly Valve?+
The Lug Type Butterfly Valve is available in pressure ratings of PN10 / PN16, Class 150. Higher-pressure classes are available for critical service applications in oil & gas, power generation, and chemical processing.
How do I request a quote for the Lug Type Butterfly Valve?+
You can request a quote by clicking the "Request Quote" button on this page, filling out our RFQ form at vajravyuh.com/rfq, emailing us at sales@vajravyuh.com, or WhatsApping us directly at +91-9979774557. Please include quantity, size, pressure class, material grade, and end-connection type for the fastest response.
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Other Butterfly Valves
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Lightweight wafer design that fits between flanges for space-saving installation.
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Double Flanged Butterfly Valve
Heavy-duty flanged design for high-pressure and critical service applications.
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Triple Offset Butterfly Valve
Metal-seated, zero-leakage design for high-temperature and high-pressure applications.
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