Universal Flange Butterfly Valve

Product Overview

The Universal Flange Butterfly Valve is engineered as a robust and reliable solution for a wide range of industrial flow control applications. Its design features integral flanged ends, allowing for direct and secure bolting to matching pipe flanges, which simplifies installation and ensures a leak-proof connection in demanding environments.

Available with either a manual lever or gearbox actuator, this valve provides precise 90-degree on/off operation. The lever option is ideal for smaller sizes requiring quick actuation, while the gearbox offers mechanical advantage for larger valves or applications with higher torque demands. Its universal design ensures compatibility with a broad spectrum of non-corrosive and mildly corrosive media.

Constructed with a durable ductile iron body and a precision-machined stainless steel disc, the Universal Flange Butterfly Valve delivers reliable performance and a long service life in moderate pressure and temperature conditions. Its bi-directional sealing capability eliminates flow direction restrictions, offering exceptional value for standard industrial applications.

Key Features & Benefits

Integral Flange Design

Flanged ends allow for direct, secure bolting to pipeline flanges, simplifying installation and ensuring a robust, leak-proof connection.

Manual Actuation Options

Available with lever for quick operation or gearbox for mechanical advantage, catering to various valve sizes and operational requirements.

ISO/API Compliance

Fully compliant with ISO 5752 and API 609 standards for industrial butterfly valve design and performance, ensuring quality and reliability.

Bi-Directional Sealing

Symmetrical disc design ensures reliable sealing performance in both flow directions, eliminating flow direction restrictions and simplifying installation.

Durable Construction

Ductile iron body and stainless steel disc/shaft provide excellent durability and corrosion resistance for long service life in demanding industrial environments.

High Strength & Rigidity

The flange connection provides a robust mechanical joint, offering superior structural integrity and resistance to pressure and mechanical stress compared to wafer-style valves.

Technical Specifications

Basic Parameters

Parameter	Specification Range
Nominal Diameter (DN/NPS)	DN50 ~ DN1200 (2" ~ 48") Common Sizes: DN100, DN150, DN200, DN300, DN400, DN500
Nominal Pressure (PN/Class)	PN10, PN16, PN25 (10bar to 25bar) Class 150, Class 300 (285psi to 720psi)
Operating Temperature	-20°F ~ 400°F (-29°C ~ 204°C)
Applicable Media	Water, Oil, Gas, Steam, Chemicals, Mildly Corrosive Fluids
Sealing Class	ISO 5208 Class IV

Material Specifications

Component	Material Options	Standards/Features
Valve Body	Ductile Iron, Carbon Steel	EN-GJS-400-15, ASTM A216 WCB, Integral Flange
Disc	Stainless Steel	AISI 304/316, Precision-Machined for Optimal Sealing
Seat	NBR/EPDM/Viton/PTFE	Synthetic Rubber or PTFE, Abrasion and Chemical Resistant
Shaft	Stainless Steel	AISI 304/316, Anti-Corrosive Design
Actuator	Manual Lever or Gearbox	Lever for Quick Operation, Gearbox for Mechanical Advantage

Standards & Compliance

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

Working Principle

The Universal Flange Butterfly Valve controls fluid flow using a rotating disc and resilient seat mechanism. Its operation is facilitated by either a manual lever or a gearbox actuator:

Opening Process: For lever operation, a quick 90° turn of the handle rotates the disc to a parallel position with the flow direction, allowing media to pass through with minimal resistance. For gearbox operation, rotating the handwheel (typically 4-10 turns) drives the worm gear, which rotates the disc to the open position.
Closing Process: Rotating the lever or handwheel in the opposite direction turns the disc to a perpendicular position, compressing the resilient seat (NBR/EPDM/Viton/PTFE) against the disc to create a tight seal and shut off flow. The gearbox provides mechanical advantage for easier operation of larger valves.
Sealing Assurance: The resilient seat conforms to the disc surface, providing reliable bi-directional sealing even with fluctuating pressures. The integral flange design ensures a secure connection to the pipeline, preventing external leakage and ensuring system integrity.

Application Areas

General Industry

Chemical processing, power generation, and manufacturing plants requiring robust and reliable flow control in various systems.

Water & Wastewater

Municipal water supply, wastewater treatment, and large-scale irrigation systems where secure flange connections are preferred.

Oil & Gas

Upstream, midstream, and downstream applications for oil, gas, and water injection systems requiring reliable shut-off valves.

Power Generation

Boiler feedwater, cooling water, and flue gas desulfurization systems in power plants where secure and durable valves are essential.

Installation & Maintenance

Installation Guidelines

Inspect the valve for damage and confirm it is in the closed position before installation. Clean the pipeline flanges to remove any debris or contaminants.
Position the valve between the two pipeline flanges, ensuring the valve body is centered and the flange bolt holes align correctly with the pipeline flange holes.
Install gaskets between the valve flanges and the pipeline flanges (if not already integrated) and secure with flange bolts.
Tighten the flange bolts evenly in a crisscross pattern to avoid uneven pressure on the valve body and ensure a proper, leak-free seal.
Ensure the actuator (lever or gearbox) is mounted correctly and operating in the proper direction (consult the arrow on the valve body for flow direction and actuator for open/close direction).
Conduct hydrostatic testing (1.5×PN) and leakage testing after installation before commissioning the system.

Maintenance Recommendations

Regularly inspect the resilient seat for signs of wear, cracking, or deformation. Replace the seat if necessary to maintain optimal sealing performance.
Lubricate the gearbox (if equipped) annually or as per manufacturer recommendations to ensure smooth operation and prevent corrosion.
Check the shaft and disc for corrosion or buildup. Clean and lubricate the shaft bearings as needed to maintain smooth rotation.
Inspect the actuator (lever or handwheel) and its connections for looseness or damage. Tighten or replace components as required to ensure reliable operation.
For long-term shutdown, flush the valve with clean water to remove any residual media and prevent seat hardening or corrosion.

Frequently Asked Questions (FAQ)

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

A: A flange-style valve has integral flanged ends for direct bolting to pipeline flanges, providing a robust connection. A wafer-style valve is thinner and fits between two pipeline flanges, secured by the same bolts, making it more compact but potentially less rigid.

Q: When should I choose a gearbox actuator over a lever?

A: Choose a gearbox actuator for larger valve sizes (typically DN200 and above) or applications where higher torque is required to overcome seating friction, making manual operation easier and more controlled.

Q: Can the manual actuator be replaced with an automated one?

A: Yes, most flange butterfly valves are designed with a mounting pad that is compatible with electric, pneumatic, or hydraulic actuators for automated control. Contact our technical team for actuator compatibility and specifications.

Q: Are flange butterfly valves suitable for vacuum applications?

A: While they can handle some vacuum conditions, standard flange butterfly valves are primarily designed for positive pressure applications. For high-vacuum service, specialized valves with enhanced sealing features may be required. Please consult with our sales team for specific vacuum ratings.

Need Custom Solutions?

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

Contact Our Technical Team