Butterfly Valve

Butterfly Valve Manufacturers in USA

SVR Global manufactures butterfly valves for applications where installed footprint, weight, and flow control matter as much as shutoff. Butterfly valves from SVR Global come in three types of body construction, wafer, lug, and flanged. Moreover, our valves come in concentric, double offset, and triple offset types in accordance with the API 609 standard. The reason why our valves have smaller size and lower weight compared to a ball or gate valve is because the disc rotates in the line, not across it.

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Butterfly valve Specifications 

Butterfly Valve Overview:

• A butterfly valve regulates the fluid flow with the help of a disc fixed to a shaft that turns inside the pipe bore. 

• The turning of the shaft by ninety degrees causes the disc to turn from the parallel position (fully open) to the perpendicular one (fully closed). 

• In contrast to a ball valve, the disc is always located within the flow path; hence, there is some resistance but a compact valve body.

Working Principle of Butterfly Valve:

The disc's position within the bore can be set anywhere between fully open and fully closed, giving butterfly valves genuine throttling capability rather than just on/off operation. The seat, typically a rubber or PTFE liner around the inside of the body, seals against the disc edge when closed. At partial openings, the disc angle determines flow rate, making this valve type a common choice where flow needs to be regulated, not just switched on or off.

Butterfly Valve Types:

• Concentric Butterfly valve

• Double eccentric Butterfly valve

• Double Flanged Butterfly valve

• Double offset Butterfly valve

• Lug Butterfly valve

• Triple Eccentric Butterfly Valve

• Triple offset Butterfly valve

• Wafer Butterfly valve 

Disc and Seat Configurations:

Concentric valves center the disc and shaft directly in the pipe bore, with the disc edge sealing against a flexible rubber seat, a simple, low cost design suited to moderate pressures and temperatures. Double offset valves shift the shaft off center in two directions, reducing seat friction during rotation and extending seat life. Triple offset valves add a third offset to the seat's sealing angle itself, allowing a metal to metal seal that removes the flexible seat entirely used where zero leakage shutoff or high temperature service is required.

Butterfly Valve Body Designs:

• Wafer - sits between two pipe flanges, held in place by the flange bolts running through the valve body

• Lug - has threaded lugs, allowing either side of the pipeline to be unbolted and removed independently

• Flanged - has its own integral flanges bolted to the pipe flanges on each side

Torque and Operating Performance:

• Butterfly valves require torque input to overcome seat friction, especially at the start (breakaway torque) and end of rotation. 

• Torque increases with valve size, pressure differential, and seat material resilient seats generally need higher breakaway torque than metal seats. 

• Actuator sizing should be based on the valve's rated breakaway torque at maximum differential pressure, not just its running torque, to avoid stalling on startup.

Pneumatic and Electric Actuation:

Butterfly valves have a top flange that allows the fitting of pneumatic or electric actuators through ISO 5211 standards without the need for any special brackets. Pneumatic actuators provide quick actuation and cycle, while electric actuators are used when accurate position feedback is required, or when there is no compressed air supply.

Installation Benefits:

• Because the disc rotates within the bore instead of sliding through it, butterfly valves have a shorter face to face dimension than ball or gate valves of the same size. 

• This reduces both the valve's weight and the length of pipe it occupies, lowering material and installation cost on large diameter lines, a meaningful factor once sizes exceed 12 inches, where a ball or gate valve alternative becomes substantially heavier and more expensive.

Applications of Butterfly valve:

• Water and wastewater treatment - Flow control for treatment plants and distribution lines.

• Marine and shipboard piping - Corrosion resistant valves for saltwater and shipboard systems.

• Power generation cooling lines - Durable valves for high flow cooling water systems.

• Bulk material and slurry handling - Rugged valves built for abrasive and high solids media.

• General industrial process lines - Versatile flow control for everyday industrial piping.

International Standards:

• API 609 - butterfly valve design standard

• MSS SP-67 / SP-68 - general and high performance butterfly valve standards

• ASME B16.34 - pressure temperature ratings

• EN 593 - European butterfly valve standard, referenced for export projects

Leakage Performance Of Butterfly valve:

• Leakage class defines the amount of fluid allowed to pass a closed valve under test conditions.

• Ranges from Class II (small measurable leak allowed) to Class VI (bubble tight, essentially zero leakage).

• Resilient seated butterfly valves typically achieve Class IV.

• Triple offset, metal seated designs are tested to Class VI.

• Specifying the correct leakage class is critical in applications where even minor bypass affects downstream process control or safety.

Automation Compatibility of Butterfly valve

SVR Global butterfly valves mount to pneumatic and electric actuators through a standard ISO 5211 top flange, so actuators from most manufacturers can be fitted without a custom adapter. This makes it straightforward to convert a manually operated valve to automated control, or to standardize actuator selection across a mixed fleet of valve sizes.