Electric Flange Butterfly Valve

Product Overview

The Electric Flange Butterfly Valve is engineered for secure and straightforward installation via its integral flange connections, which eliminate the need for additional flange adapters. This design ensures a rigid and leak-proof assembly in high-pressure or high-vibration systems.

Equipped with a powerful electric actuator, this valve provides precise, remote control over flow rates, making it ideal for applications requiring automated on/off operation or modulating control. The actuator can be configured with a range of control options, including 4-20mA signals for proportional flow regulation.

Constructed from durable materials such as ductile iron or stainless steel, and featuring resilient seats (EPDM, NBR, PTFE, or Viton), the Electric Flange Butterfly Valve offers excellent corrosion resistance and a long service life, even in harsh operating conditions involving corrosive media or extreme temperatures.

Key Features & Benefits

Electric Actuation

Delivers precise remote control and automation capabilities, suitable for systems requiring accurate on/off or proportional flow control.

Integral Flange Design

Features built-in flange connections for easy, direct mounting to pipeline flanges, ensuring a secure and leak-free seal in high-pressure applications.

Proportional Control Option

Available with 4-20mA or 0-10V signals for precise proportional flow control in automated industrial systems.

Resilient Seating

Provides superior sealing performance with resilient materials (EPDM, NBR, PTFE, Viton), suitable for a wide range of media and temperatures.

Easy Maintenance

Modular design allows for quick replacement of the actuator or seat without removing the valve from the pipeline, minimizing downtime.

ISO 5752 & API 609 Compliance

Designed and manufactured to meet international standards, ensuring compatibility and reliability in global industrial applications.

Technical Specifications

Basic Parameters

Parameter	Specification Range
Nominal Diameter (DN/NPS)	DN50 ~ DN2000 (2" ~ 80")
Nominal Pressure (PN/Class)	PN10, PN16, PN25, PN40 Class 150, Class 300, Class 600
Operating Temperature	-40°F ~ 450°F (-40°C ~ 232°C)
Applicable Media	Water, Air, Oil, Steam, Chemicals, Slurries (with appropriate seat material)
Sealing Class	ISO 5208 Class IV or V

Material Specifications

Component	Material Options	Standards/Features
Valve Body	Ductile Iron, Carbon Steel, Stainless Steel	EN-GJS-400-15, ASTM A216 WCB, ASTM A351 CF8/CF8M
Disc	Ductile Iron, Stainless Steel	EN-GJS-400-15, AISI 304/316
Seat	EPDM, NBR, PTFE, Viton	Corrosion and Temperature Resistant
Shaft	Stainless Steel	AISI 304/316
Actuator	Electric (On/Off or Proportional)	24V DC, 110V AC, 220V AC, 4-20mA Control Option

Standards & Compliance

Design Standards: ISO 5752, API 609
Flange Standards: ISO 7005-1, ANSI B16.5 Class 150/300/600
Testing Standards: ISO 5208, API 598
Certifications: CE, ISO 9001

Working Principle

The Electric Flange Butterfly Valve operates using a rotating disc controlled by an electric actuator:

Electric Actuation: The electric actuator receives a control signal (e.g., 4-20mA or digital command) and rotates the valve shaft to open or close the disc.
Opening Process: Rotating the disc to a parallel position with the flow direction allows media to pass through the valve with minimal pressure drop.
Closing Process: Rotating the disc to a perpendicular position blocks the flow path, creating a tight seal against the resilient seat.
Proportional Control: In proportional mode, the actuator adjusts the disc position based on the input signal (e.g., 4-20mA) to maintain a desired flow rate.

Application Areas

Power Generation

Boiler feedwater, cooling water systems, and flue gas desulfurization in power plants.

Oil & Gas

Pipeline transportation, refineries, and petrochemical processing plants.

Chemical Processing

Handling of corrosive and non-corrosive chemicals in industrial plants.

Water & Wastewater

Municipal water supply, wastewater treatment, and desalination plants.

Installation & Maintenance

Installation Guidelines

Inspect the valve and actuator for damage before installation. Ensure the valve is in the closed position.
Align the valve flanges with the pipeline flanges, ensuring proper bolt hole alignment. Use appropriate gaskets to ensure a leak-free seal.
Tighten the flange bolts evenly in a crisscross pattern to avoid uneven pressure on the valve body.
Connect the actuator to the control system according to the manufacturer's wiring diagram. Test the actuator for proper operation before commissioning.
Conduct hydrostatic testing (1.5×PN) and leakage testing after installation to verify performance.

Maintenance Recommendations

Regularly inspect the seat for signs of wear or damage. Replace the seat if necessary to maintain sealing performance.
Clean the valve interior periodically to remove any buildup or debris that may affect operation.
Check the actuator connections and wiring for looseness or damage. Replace any faulty components as needed.
Lubricate the actuator gearbox (if equipped) annually or as per manufacturer recommendations.
For long-term shutdown, flush the valve with clean water to prevent seat hardening or corrosion.

Frequently Asked Questions (FAQ)

Q: What is the difference between a flange and wafer butterfly valve?

A: A flange butterfly valve has integral flanges for direct bolted connection to pipeline flanges, offering better structural integrity for high-pressure applications. A wafer valve is thinner and clamped between two pipeline flanges without its own flanges, making it more compact and cost-effective for lower pressure systems.

Q: Can the Electric Flange Butterfly Valve be used for throttling applications?

A: Yes, when equipped with a proportional electric actuator (4-20mA control), this valve can be used for throttling applications. However, for precise flow control, consider a control valve with a suitable flow characteristic.

Q: What seat material is best for high-temperature applications?

A: For high-temperature applications, PTFE or Viton seats are recommended due to their excellent heat resistance. EPDM or NBR seats are suitable for lower temperature ranges. Contact our technical team for assistance in selecting the right seat material for your specific application.

Q: Is the Electric Flange Butterfly Valve suitable for vacuum applications?

A: Yes, this valve can be used for vacuum applications with appropriate seat materials (e.g., PTFE) and actuator selection. Consult with our engineering team to ensure the valve is properly configured for your vacuum service requirements.

Need Custom Solutions?

Our engineering team can customize Electric Flange Butterfly Valves to meet your specific pressure, temperature, and media requirements. Contact us today for a personalized quote.

Contact Our Technical Team