Designed for reliable flow isolation and control, lug type butterfly valves provide strong bolted mounting, maintenance flexibility and compact installation for demanding industrial applications.
Key design and construction parameters for selecting the appropriate lug type butterfly valve.
| Parameter | Specification |
|---|---|
| Valve Type | Lug Type Butterfly Valve |
| Size Range | DN 40 to DN 1200 |
| Pressure Rating | PN10 / PN16 / PN25 / PN40 depending on design |
| Body Material | CI / DI / WCB / CF8 / CF8M |
| Disc Material | SG Iron / SS304 / SS316 |
| Seat Material | EPDM / NBR / PTFE / Metal depending on duty |
| Shaft Material | SS410 / SS304 |
| End Connection | Lug Type |
| Operation | Lever / Gear / Pneumatic / Electric |
| Design Standard | API / BS / EN as applicable |
| Testing Standard | API 598 |
Material selection should be based on the process medium, temperature, pressure and required corrosion resistance.
Compare lug type construction with other butterfly valve configurations based on installation requirements.
Select the valve configuration according to the actual pipeline and process requirements.
Select lug type where stronger bolted support is preferred.
Use lug design where one-side piping removal may be needed.
Choose seat and body materials according to process media and temperature.
Select lever, gear or actuator depending on valve size and operating frequency.
Lug type is often preferred over wafer where maintenance flexibility matters.
For the most economical compact solution, wafer type may still be preferred.
For stronger full flange-supported applications, double flanged may be better.
Disc, seat and torque selection strongly influence valve performance.
Discuss your valve size, pressure rating, media, temperature and operation requirements with our team.
Enquire Now →Forex Valves is a manufacturer and supplier of lug type butterfly valves for isolation and flow control in compatible industrial piping systems. These valves have a lugged body with separate bolting points for connection to mating pipe flanges. Selection depends on pipeline size, pressure, temperature, process medium, sealing requirements and method of operation.
Lug type butterfly valves are used in water treatment, utility piping, HVAC and industrial process applications where the valve configuration meets the operating requirements. Explore our industrial butterfly valve range to compare the available designs and configurations.
A lug type butterfly valve is a quarter-turn valve with threaded lugs built into its body. These lugs are used for bolting the valve to mating pipe flanges. The internal disk rotates approximately 90 degrees between the open and closed positions.
Depending on the design and installation arrangement, a lug type valve may offer maintenance flexibility when one side of a pipeline needs to be disconnected. Suitability for end-of-line service must be verified against the valve pressure rating, manufacturer's installation instructions and isolation requirements.
The body houses the disk, shaft and sealing components and provides the connection to the pipeline. Threaded lugs allow the valve to be bolted to mating flanges using the specified fasteners and installation procedure.
The disk rotates to open, restrict or close the flow channel. The shaft transmits torque from the lever, gearbox or actuator to the disk. Disk and shaft materials should be compatible with the process fluid and operating conditions.
The seat is the sealing interface between the disk and the valve body. Seat selection affects sealing performance, operating torque, temperature limits and chemical compatibility. EPDM, NBR, PTFE and metal seating options may be considered where supported by the selected valve design.
A butterfly valve operates through a quarter turn of approximately 90 degrees. The operating mechanism must provide sufficient torque for the valve size, differential pressure, seat configuration and service conditions.
The Forex Valves product information lists the specifications below. Confirm the applicable combination for the exact model before ordering.
| Parameter | Listed Specification |
|---|---|
| Valve Type | Lug Type Butterfly Valve |
| Size Range | DN 40 to DN 1200 |
| Pressure Ratings | PN10 / PN16 / PN25 / PN40, based on design |
| Body Materials | CI / DI / WCB / CF8 / CF8M |
| Disk Materials | SG Iron / SS304 / SS316 |
| Seat Materials | EPDM / NBR / PTFE / Metal, based on service |
| Shaft Materials | SS410 / SS304 |
| End Connection | Lug type |
| Operation | Lever / Gear / Pneumatic / Electric |
| Design Standards | API / BS / EN, where applicable |
| Standard Testing | API 598, listed for the product |
Maximum permissible pressure and temperature depend on the particular valve construction, material combination, seat and size. Refer to the product datasheet and applicable standards for the selected configuration.
Material selection should take into account the process fluid, fluid concentration, operating temperature, pressure and corrosion requirements.
No single material is suitable for every process fluid. Check the complete wetted-material combination before making the final selection.
The pressure rating indicates the rating applicable under specified conditions. It does not determine the permissible operating pressure for every combination of temperature and material.
Valve operating torque is affected by disk size, differential pressure, seat friction, material selection and process conditions. Gearbox or actuator selection must be based on the manufacturer's torque requirements and the intended operating duty.
Where valve size and operating torque permit, a lever provides manual quarter-turn control and direct operation.
When manual lever operation requires excessive effort, a gearbox can reduce the effort required from the operator. The gearbox must match the operating torque and service requirements of the valve.
Pneumatic actuation uses compressed air to operate the valve. It can be applied in automatic systems where the actuator, control accessories and available air supply meet the application requirements. Explore our pneumatic butterfly valve options for automated operation. Confirm actuator torque and valve compatibility for the intended service.
An electric actuator provides powered operation and may be used for remote control or integration with plant automation systems. Check actuator torque, power supply, control requirements and operating frequency.
Lug type butterfly valves can be used in the following applications when the materials, pressure ratings, temperature limits and sealing arrangements are compatible with the service.
Used for flow isolation in compatible water treatment, distribution and wastewater systems.
Used for isolation in chilled-water, cooling-water and other compatible utility lines.
Used for flow isolation in process lines when the selected valve meets the operating and sealing requirements.
Chemical service requires verification of the body, disk, shaft, seat and other wetted materials against the process medium.
Used in utility and infrastructure pipelines where the lug connection configuration meets the project's installation and maintenance requirements.
Both lug type and wafer type butterfly valves have a rotating disk, but their body connection arrangements differ.
| Comparison Point | Lug Type Butterfly Valve | Wafer Type Butterfly Valve |
|---|---|---|
| Body Connection | Threaded lugs provide bolting points. | Body is generally clamped between mating flanges. |
| Installation Hardware | Bolting arrangement specified for the lug design. | Bolting arrangement specified for the wafer design. |
| Maintenance Access | May permit one-side disconnection if the design and installation allow it. | Removal normally requires the specified flange and piping arrangement. |
| Space Requirements | Depend on body and lug dimensions. | Frequently used for compact installations. |
| Cost | Varies according to size, materials and design. | May have a lower initial cost in comparable configurations. |
| Selection Criteria | Connection requirements, isolation and maintenance access. | Space, cost, flange arrangement and service requirements. |
Neither design is necessarily suitable for every installation. Before choosing, check the pressure class, flange compatibility, installation instructions and intended isolation procedure.
Proper installation helps avoid damage to the seat, disk and body connections.
Isolate the pipeline, depressurize it and drain it as required by the approved site safety procedure before loosening any connection. Never assume that a lug type valve can safely hold pressure when one side is disconnected.
Forex Valves product information mentions API, BS and EN for design and API 598 for testing, where applicable. The relevant standard and edition must be checked against the selected valve model and purchase specification.
Design requirements, face-to-face dimensions, flange compatibility, pressure-temperature limitations and inspection requirements are separate considerations. If a project requires compliance with a specific standard, request the applicable product documentation.
Forex Valves supplies industrial valve products to clients in India and worldwide. For a lug type butterfly valve inquiry, provide the required nominal size, pressure class, process fluid, operating temperature, material preference, connection details and operating method.
These details help define the valve configuration to be evaluated for the application. Verify availability, manufacturing specifications, testing documentation and delivery requirements with Forex Valves.
It is a quarter-turn valve with threaded lugs in its body for bolting to mating pipe flanges.
The operating mechanism turns the disk approximately 90 degrees to open or close the flow passage.
It is used for flow isolation and suitable flow-control duties in compatible water, utility, HVAC and industrial piping applications.
A lug type valve has threaded body lugs for bolting to mating flanges. A wafer type valve is generally sandwiched between two flanges. The choice depends on installation, operating conditions and maintenance requirements.
Forex Valves product information lists PN10, PN16, PN25 and PN40, depending on design. Check the rating for the selected size, materials and operating conditions.
EPDM, NBR, PTFE and metal seats are listed as options depending on valve design. Selection should be based on fluid compatibility, pressure, temperature and sealing requirements.
Listed operating options include lever, gear, pneumatic and electric operation. Verify the availability and actuator compatibility of the requested model.
Possible causes include seat wear, disk damage, material incompatibility, misalignment or incorrect flange installation. Inspection is needed to determine the actual cause.
Specify the pipeline size, pressure, temperature, process fluid, required sealing performance, flange arrangement, operating method and maintenance requirements. Check the final configuration against the manufacturer's datasheet.
Contact Forex Valves with your application details to discuss a suitable valve configuration, technical documentation and quotation requirements.