Lug Type Butterfly Valve
Description
Lug Type Butterfly Valve
Resilient Seated Industrial Lug Butterfly Valves | PN10 / PN16 / PN25 | DN 40β1200
MNC Valves is a Manufacturer of Lug Type Butterfly Valve in India, manufacturing heavy-duty resilient seated butterfly valves designed for secure bolted installation, sectional pipeline isolation, and maintenance-friendly industrial applications.
Lug type butterfly valves are widely used where one-side pipeline removal is required without disturbing the opposite side, making them ideal for plant maintenance and modular piping systems.
MANUFACTURING STANDARDS
Manufactured in compliance with:
- API 609 β Butterfly Valves
- EN 593 β Industrial Butterfly Valves
- MSS SP-67 β Resilient Seated Butterfly Valves
- ASME B16.34 β Pressure-Temperature Ratings
- API 598 β Inspection & Testing
Face-to-face dimensions as per:
- EN 558 Series 20
- API 609 (Category A β Where applicable)
Flange drilling compatibility:
- ASME B16.5
- EN 1092-1
- IS Standard
PRODUCT DESIGN OVERVIEW
Lug type butterfly valves are installed between two flanges using threaded lugs integrated into the valve body.
Each flange bolt is threaded into the valve body, allowing:
- Independent flange tightening
- One-side pipeline disassembly
- Secure positioning in dead-end service (subject to pressure rating)
Design includes:
- Concentric disc configuration
- Moulded or replaceable seat
- Blow-out proof shaft
- Precision machined disc
- Threaded lug body
This design provides:
- β Maintenance flexibility
- β Secure bolted installation
- β Suitable for sectional isolation
- β Heavy-duty industrial configuration
SIZE & PRESSURE RANGE
- Size Range: DN 40 mm to DN 1200 mm
- Pressure Rating: PN10 / PN16 / PN25
- ANSI Class: 150
- Temperature: As per seat material limits
Dead-end service capability depends on size and pressure rating.
MATERIALS OF CONSTRUCTION
| Body Materials | Disc Materials | Seat Materials |
|---|---|---|
|
Cast Iron (CI) Ductile Iron (DI) WCB (Carbon Steel) CF8 (SS304) CF8M (SS316) Aluminium Bronze Duplex (On Request) |
SG Iron SS304 SS316 Aluminium Bronze Duplex (On Request) |
Moulded Seat (Primary Manufacturing Strength): β’ EPDM β’ NBR β’ Viton β’ Silicon Replaceable Seat (Optional Design): β’ EPDM β’ NBR β’ Viton β’ Silicon β’ PTFE |
DESIGN FEATURES
- Threaded lug body design
- Bi-directional sealing
- ISO 5211 top mounting pad
- Low operating torque
- Blow-out proof shaft
- Compact face-to-face dimension
- Suitable for automation
- Maintenance-friendly design
END CONNECTION
- Lug type installation between flanges
- Compatible with ANSI / DIN / IS drilling standards
- Individual bolt tightening capability
TESTING & QUALITY CONTROL
All valves tested as per API 598:
- Hydrostatic shell test
- Seat leakage test
- Functional torque verification
Third-party inspection available upon request.
OPERATING PRINCIPLE β LUG TYPE CONCENTRIC DESIGN
The disc rotates 90Β° inside the pipeline.
- 0Β° β Closed
- 90Β° β Fully open
The resilient seat provides tight shut-off and allows bi-directional sealing within rated pressure limits.
APPLICATIONS
- Water Treatment Plants
- Chemical Processing Units
- HVAC Systems
- Power Plant Cooling Systems
- Fire Protection Networks
- Modular Industrial Pipelines
LUG TYPE VS WAFER TYPE β ENGINEERING DIFFERENCE
| Feature | Lug Type | Wafer Type |
|---|---|---|
| Bolt Engagement | Threaded lugs | Through bolts |
| Maintenance | One-side removal possible | Full line shutdown required |
| Dead-End Capability | Possible (rated sizes) | Generally not recommended Cost | Higher | Economical |
Lug type valves are preferred where maintenance flexibility and sectional isolation are required.
AUTOMATION COMPATIBILITY
Available With:
- β’ Pneumatic Actuation
- β’ Electric Actuation
- β’ Manual Lever Operation
- β’ Gear operation
Suitable for automated industrial flow control systems.
Frequently Asked Questions
ENQUIRY DETAILS REQUIRED
To select correct valve, please provide:
Our engineering team will assist in proper configuration and material selection.
