Wafer & Lug Butterfly Valves

A butterfly valve is a valve that is used to regulate or shut off the flow of a fluid through a pipe. It is called a butterfly valve because its disk or plate that controls the flow of fluid through the valve resembles the shape of a butterfly wing. The valve uses a disc that rotates 90 degrees from open to close to block or control the flow in a piping system.

Norriseal-Wellmark’s Butterfly Valves are trusted across various industries, including oil and gas, marine, and food and beverage processing. Available in sizes ranging from 2 inches to 36 inches and featuring a variety of durable materials, they provide reliable, repairable flow control for demanding applications. Contact us today for a quote or assistance in selecting the right valve for your specific needs. Norriseal-Wellmark’s Norris Butterfly valves are used in a variety of industries and applications from Oil and Gas to Food and Beverage. They are available in a variety of sizes and materials to suit different applications. We pride ourselves in offering high-quality valves in applications requiring reliable and repairable valves. Contact us today for a quote!

Download Case Study

Contact an expert

Wafer-style butterfly valves

Wafer-style valves are designed to fit snuggly between two flanges using long bolts that run through the flanges and the valve body. They are held in place by the compression of the flange bolts.

Key benefits:

Economical and compact
Ideal for systems where valve removal is not frequently needed
Great for HVAC, food & beverage, and general industrial use

Best suited for:

Compact and space-constrained piping systems
Cost-sensitive applications
HVAC, food & beverage, and general industrial use

Lug-style butterfly valves

Lug-style valves feature threaded inserts (lugs) around the valve body. Bolts are inserted through the flanges directly into these lugs, allowing each flange to be connected independently.

Key benefits:

Allows for dead-end service downstream piping can be removed without shutting down the entire system
Suitable for high-performance and critical-service applications
Provides stronger and more reliable flange connections

Best suited for:

Marine and shipboard systems (including U.S. Navy and Coast Guard vessels)
Oil & gas and other process-critical industries
Systems requiring frequent maintenance or section isolation

The Norris Advantage

Compared to other valve types, butterfly valves feature a low profile, low torque requirements, bubble tight shut off, the ability to handle different media types, and can be paired with various actuators. Due to low torque requirements, butterfly valves are offered in large sizes with a smaller actuation solution.

Angle-disc design: Our competitors use a vertical disc design which compresses the seat at the 12 and 6 o’clock positions, causing frictional wear which will require more torque to operate the valve. Norris’ differentiated design requires less torque and causes less wear on the seat.
Three-year warranty: The only butterfly valve on the market with a three-year warranty.
Sealing principal design: Independent body seals are used for flange sealing, which avoids the need to use a gasket during installation.
Double shaft seal: The double shaft seals provide redundant protection against outside contamination of bearing areas and fluid leakage into the shaft area.

Norriseal-Wellmark’s butterfly valves are proudly built in Texas and designed for dependable, bi-directional shutoff and smooth, low-torque operation in demanding environments. Engineered for durability and versatility, these valves are trusted across a wide range of industries.

Industries we serve

Food & Beverage

The versatility and compact design of butterfly valves make them a popular choice in the food and beverage industry.

Industrial

High-performance butterfly valves are economic and easy to install with less maintenance required that is why they are used in a vast number of industrial processes.

Marine

Butterfly valves are durable and reliable and are best suited for the extreme environments and conditions of marine applications.

Navy & Coast Guard

On Navy ships butterfly valves are used for large capacity lines, such as forward and aft sea water suction lines, or lines from various tanks to their respective pumps.

Oil & Gas

Butterfly valves are widely used in the oil and gas industry due to their capability to deliver a high degree of durability and reliability to ensure long service and low maintenance needs of pipelines in oil and gas applications.

Refrigeration

Butterfly valves are commonly used in HVAC systems to regulate airflow in ducts and dampers. They are also used in heating and cooling systems to control the flow of water or glycol.

Products

Series Comparision

	R-Series	R-Series	M-Series	M-Series	D-Series
	R200	R285	M200	M285	M200
Positive shutoff (bi-directional)	Yes	Yes	Yes	Yes	No
Bi-directional flow	Yes	Yes	Yes	Yes	Yes
Maximum velocity for throttling controls (liquids)	30 fps	30 fps	16 fps	16 fps	30 fps
Temperature range	-20 F to +250 F	-20 F to +250 F	-40 F to -350 F	-40 F to -350 F	-40 F to +400 F
Maximum working pressure	200 psi	285 psi (150# ANSI)	200 psi	285 psi	200 psi

Butterfly Valve Parts

A butterfly valve typically consists of the following parts:

Valve Body – The body of the valve installed between two flanges. Types of bodies are Span Wafer, Double Rib Span Wafer, or Lugged, and is a non-wetted component.
Valve Disc – The disc is mounted inside the body and rotates 90 degrees against the seat to open or close the valve. Norriseal’s angle disc is designed to eliminate contact seat compression and allows for less torque to operate.
Stems or Shafts – This part connects the disc to the actuation of the valve. It can be offered in different materials compatible with the media.
Seat – Internal lining of the valve. The design of the seat matches the angle design of the disc to achieve complete shutoff at the closed position. Available as a resilient seat or metal seat in different materials.
Seals – Multiple seals are present in the valve suited to the media and application. Extra shaft seals help prevent leaks to the outside of the valve from the inside. A disc seal is used for creating the positive shutoff with metal seated valves. Body seals allow the valve to be installed between the flanges without the use of gaskets and eliminate the pressure on the resilient seat.
Actuation – Operation of the valve. Wide range of options such as manual handles, gear operators, pneumatic, or electric actuators.

There can be slight variations in the design of butterfly valves depending on their application and type, but these are the most common parts found in a standard butterfly valve. If you have any questions, please contact us today for assistance in selecting the best option based on your specific requirements.

SUCCESS STORY

Norriseal Butterfly Valves Case Study

Operator boosts run time, halts oil leaks, and adds $16k/year with durable butterfly valves

Norriseal’s Norris butterfly valves exceeded expectations, showcasing a run time increase of “conservatively 50% greater run time” compared to competitors. In several instances, these valves outperformed competitors, saving thousands in replacement costs.

Learn More