A Concentric Butterfly Valve is an industrial isolation valve featuring a centered stem and disc design. It is widely used for flow control and shut-off applications in water treatment, HVAC, industrial process, and utility pipeline systems.
Technical Data
|
Parameter |
Specification |
|
Valve Type |
Concentric Butterfly Valve |
|
Design Structure |
Centered Stem and Disc |
|
Size Range |
DN50–DN1200 (2"–48"), Customized Sizes Available |
|
Pressure Rating |
PN10, PN16, Class 150, Customized Pressure Classes |
|
Temperature Range |
-20°C to +120°C (Depending on Material Selection) |
|
Connection Type |
Wafer, Lug, Flanged |
|
Body Materials |
Carbon Steel, Stainless Steel, Duplex Stainless Steel, Alloy Steel |
|
Disc Materials |
Stainless Steel, Duplex Stainless Steel, Other Materials Available |
|
Seat Materials |
EPDM, NBR, PTFE and Other Elastomers |
|
Operation |
Manual, Pneumatic, Electric Actuation |
|
Applicable Media |
Water, Air, Cooling Water, Non-corrosive Industrial Fluids |
Key Features
Centered Stem and Disc Structure
The concentric design provides balanced operating torque and stable valve operation, suitable for general industrial isolation and flow regulation applications.
Space-Saving Wafer and Lug Configurations
Wafer and lug connection designs allow installation between pipeline flanges, reducing installation space requirements and simplifying maintenance access in compact piping layouts.
Bidirectional Shut-Off Capability
The resilient seat design provides bidirectional shut-off performance and helps maintain sealing integrity under standard operating conditions.
Balanced Torque Characteristics
The centered stem and disc arrangement distributes operating forces evenly, helping maintain stable torque characteristics during opening and closing operations.
Reduced Flow Resistance
The streamlined disc profile minimizes flow disturbance and helps reduce pressure loss in pipeline systems.
Concentric vs. Eccentric Butterfly Valve
|
Comparison Item |
Concentric Butterfly Valve |
Eccentric Butterfly Valve |
|
Design Structure |
Centered stem and disc design |
Offset stem and disc design |
|
Structure |
Simple structure with compact design and easy maintenance |
More complex structure for demanding applications |
|
Operating Torque |
Suitable for standard operating conditions with stable torque performance |
Reduced friction design for lower operating torque |
|
Sealing Performance |
Reliable bidirectional shut-off for general applications |
Enhanced sealing performance for higher pressure and temperature services |
|
Typical Applications |
Water treatment, HVAC, cooling water, and general industrial systems |
Power, chemical, and high-pressure industrial applications |
|
Main Advantages |
Compact design, easy installation, and reliable operation |
Better performance under severe operating conditions |
Valve Configuration Options
The valve configuration can be selected according to operating conditions, including medium characteristics, pressure rating, temperature, installation requirements, and automation needs.
PORO provides configuration options based on application requirements, including:
Body, Disc, and Stem Materials: Available in carbon steel, stainless steel, duplex stainless steel, and alloy steel according to strength and corrosion requirements.
Seat Materials: EPDM, NBR, PTFE, and other sealing materials can be selected based on temperature range, medium compatibility, and sealing requirements.
Size and Pressure Rating: Customized valve sizes and pressure classes are available according to pipeline design and project specifications.
Connection Type: Wafer, lug, and flanged configurations are available for different installation requirements.
Operation Method: Manual, pneumatic, and electric actuation options are available for different control requirements.
Surface Treatment: Coating solutions such as epoxy coating and powder coating can be applied according to operating environments.
Manufacturing Process & Quality Control
PORO applies systematic quality control throughout the manufacturing process, including:
Material Inspection
Verify body, disc, stem, and sealing materials before machining and assembly.
Machining Inspection
Check critical dimensions, machining accuracy, and assembly compatibility.
Assembly Inspection
Inspect valve assembly, operation performance, and operating torque.
Pressure Testing
Perform shell and seat leakage tests according to API 598, ISO 5208, or customer requirements.
Final Inspection
Confirm product appearance, functionality, documentation, and shipment requirements before delivery.
Company Strength and Advantages
Highly Experienced
With more than 25 years of butterfly valve manufacturing experience, PORO has supplied concentric butterfly valves for municipal water projects, cooling systems, industrial utilities, and EPC applications worldwide.
23,186㎡ Manufacturing Facility
The 23,186㎡ facility supports machining, assembly, inspection, and industrial valve production.
Full-Process Valve Manufacturing
PORO manages key manufacturing processes including material verification, CNC machining, valve assembly, pressure testing, and final inspection
Multi-Material Production Capability
Supporting valve manufacturing with carbon steel, LTCS, stainless steel, duplex stainless steel, and alloy steel materials.
Global Industrial Project Experience
PORO supports OEM customers, distributors, and engineering projects in petroleum, chemical, power, steel, shipbuilding, and water treatment industries worldwide.
FAQ
Q: What information is required to select a concentric butterfly valve?
A: To select a suitable concentric butterfly valve, customers should provide valve size, pressure rating, operating medium, temperature, connection type, operation method, and applicable standards. Additional information such as flow conditions and actuator requirements may be required for specific applications.
Q: How does a concentric butterfly valve reduce operating torque?
A: A concentric butterfly valve uses a centered stem and disc structure to provide balanced operation. The optimized sealing design and polished disc surface help reduce friction between the disc and seat, improving operating efficiency and supporting suitable actuator selection.
Q: When should an eccentric butterfly valve be considered instead of a concentric butterfly valve?
A: An eccentric butterfly valve may be considered for applications requiring higher pressure, higher temperature resistance, reduced seat wear, or more demanding sealing performance. Concentric butterfly valves are generally suitable for standard industrial isolation and flow control applications.
Q: How do I choose the right seat material for a butterfly valve?
A: Seat material selection depends on the operating medium, temperature, pressure, and chemical compatibility. EPDM is commonly used for water applications, while NBR, PTFE, and other materials may be selected for different fluid and temperature requirements.
Q: Can concentric butterfly valves be used for throttling applications?
A: Yes. Concentric butterfly valves can be used for flow regulation in many industrial systems. However, the suitability depends on flow requirements, operating conditions, and the specific application. For precise control requirements, valve selection should be evaluated based on system performance needs.
Q: Can concentric butterfly valves be used for automated systems?
A: Yes. Concentric butterfly valves can be equipped with pneumatic or electric actuators for automated flow control systems. Actuator selection depends on valve size, operating conditions, and control requirements.
Q: What causes butterfly valve leakage?
A: Butterfly valve leakage may result from improper material selection, damaged sealing surfaces, incorrect installation, excessive operating conditions, or unsuitable valve selection. Proper design selection, installation, and maintenance help reduce leakage risks.
Q: What documents are available for butterfly valve supply?
A: Documentation may include material certificates, inspection reports, pressure test records, product drawings, and other project-specific documents required for approval and delivery.
Q: What pressure conditions are suitable for concentric butterfly valves?
A: Concentric butterfly valves are commonly used for standard pressure applications such as water, HVAC, and utility systems. The suitable pressure range depends on valve size, design standard, seat material, and operating conditions.
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