Butterfly valves are an important component in many municipal, industrial, and commercial systems, as they are used to control the flow of gasses and liquids. There are several types of butterfly valves, each with its own specific designs and features.
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In this article, we will explore the different types of butterfly valves and their uses. Understanding the differences between these valves can help you choose the right one for your specific application, ensuring efficient isolation and effective flow control.
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The Wafer Butterfly Valve is sandwiched between two flanges, and none of the bolts on the flange will thread into the valve body itself. Wafer butterfly valves provide a low-cost solution for isolation.
There are several options of wafer-style valves, the most common are AWWA C504, API609, and high performance. The wafer style allows for a compact design, making it ideal for applications with limited space.
A wafer-style valve can be a zero, single, double, or triple offset butterfly valve. Among these options, the zero offset valve is the most commonly used and the least expensive. These valves are typically resilient seated, but the double and triple offset valves can be metal seated valves.
Most resilient seated valves can have replaceable seats, but some do not, so make sure you are aware of what type you&#;re getting as there are benefits to both.
The lug butterfly valve has lugs on the body of the valve, allowing for direct mounting to the pipe without the use of flanges. The counter flange bolts will thread right into the lug-style butterfly valve. Lug butterfly valves provide a low-cost solution for isolation.
There are several options for lug-style valves, and the most common are API609 and high performance. The lug style allows for a compact design, making it ideal for applications with limited space.
A lug-style valve can be a zero, single, double or triple offset butterfly valve, with the zero offset valve being the most commonly used and least expensive. These valves are typically resilient seated, but the double and triple offset valves can be metal seated valves.
If there is a metal seat on your valve, check and see if it&#;s replaceable and what it takes as far as service to ensure a long life with your valve.
Check out: Av-Tek&#;s Lug/Wafer Valves
The double flange butterfly valve has two flanges on the body of the valve, providing increased stability and security in high-pressure applications.
There are several options of flanged style butterfly valves, the most common are AWWA C504, API609, double offset or also known as double eccentric, high performance, and triple offset.
A flanged-style valve can be a zero, single, double, or triple offset butterfly valve. The zero and single offset are the most commonly used and least expensive.
AWWA C504 is written around single and zero offset valves, but there are some double and triple offset valves that meet that specification. Flanged valves are typically resilient seated. Most resilient seated valves in the flanged world are non-replaceable seats. This means if the valve begins to leak, you will be replacing the whole valve. The double flange refers to the connection to the pipe more than anything else.
This type of butterfly valve is ideal for applications where a tight seal is required, such as water treatment plants or chemical processing facilities.
Check out: Av-Tek&#;s Double Flanged Industrial Butterfly
This type of butterfly valve is designed for demanding applications and offers superior flow control. High-performance butterfly valves often have a metal-to-metal seat design and are often used in applications where a tight shutoff is required, such as power plants or pipelines carrying hazardous materials.
One advantage of using this type of butterfly valve is that its seat will outlast a standard resilient seated butterfly valve. Additionally, low torques make these valves easy to operate and extend the life of the actuator.
Notably, tight shut-off is the main reason why users choose an industrial style high-performance butterfly valve. Typically, these valves are made of either carbon steel or stainless steel, which improves their shut-off capabilities.
Av-Tek just launched a High Performance Double Offset wafer butterfly valve, which has PTFE seats and comes in SST or Carbon Steel. Please message us to learn more about this product.
The double eccentric butterfly valve is designed with an offset shaft and disc, providing improved sealing and reduced torque compared to other types of butterfly valves. This type of butterfly valve is often used in applications where a tight shutoff is required and low torque is necessary, such as water pipelines.
Double offset valves have been the standard valve around the world EXCEPT for the U.S. and Canada. Why this is the case is a question we have asked for years.
The company is the world’s best 2-Offset Butterfly Valve supplier. We are your one-stop shop for all needs. Our staff are highly-specialized and will help you find the product you need.
The double offset butterfly valve does not have issues with compression or seat set on the resilient seat. It has a double overlay weld on the body seat and typically comes with a non-wetted disc hub, among other features.
When we quote our DEX valves in Mexico, Colombia, and Puerto Rico, and the specification is for double offset valves, we scratch our heads wondering why the U.S. is so behind on the technology of butterfly valves. Although double eccentric butterfly valves cost more money, their long-term cost savings are well worth the extra upfront cost.
Check out: Av-Tek&#;s DEX Double Eccentric Butterfly Valves
Triple offset butterfly valves feature three offsets: an offset between the disc and the stem, an offset between the disc and the seat, and an offset in the sealing surface of the seat.
They are designed to eliminate rubbing between the seat and seal ring through the flow path, which reduces seat and seal wear and extends the valve&#;s cycle life. The seat of the valve also has a right-angled cone shape due to its offset conical form, which ensures smooth operation throughout the entire cycle.
Triple offset butterfly valves are often used in applications where a metal seat is required and a tight shutoff or quarter-turn actuation is desired, but they can be opened and closed more quickly and can be frequently operated, even in emergency shutoff situations.
With the third offset it makes the valve a torque seated valve rather than a position seated valve.
Butterfly valves are complex mechanisms with a variety of body types and are an important component in manufacturing and industrial processes. It is essential to understand their operation and uses in order to effectively utilize them.
When selecting a butterfly valve, we recommend that you carefully study the application requirements, such as flow rate, pressure, and space constraints, so you can choose the right type of valve for the job.
Butterfly valves are a versatile and cost-effective solution for flow isolation in pipelines. The different types of butterfly valves offer unique features and are designed for specific applications.
The double eccentric butterfly valve is just one example of the many types of butterfly valves but is relatively new to the U.S., but you&#;ll find with Av-Tek that it is readily available.
At Av-Tek, we&#;re committed to helping you find valves that bring unprecedented longevity and reliability so you can meet the critical service demands of your organization. If you want to learn more about our products, you can request a quote by filling up this form. Likewise, you may us at or call us at (385) 325- or (801) 637-.
ARE YOU CURIOUS TO KNOW ALL ABOUT BUTTERFLY VALVES? If yes then you are on the correct article. In this article, we examine all the types of butterfly valves. We start with the operating system first and then we go ahead with the mechanism and specification of all kinds of Butterfly valves.
The butterfly valve is a rotary motion quarter-turn valve. This valve can be operated by a manual handle, gear, and pneumatic actuator. Most industrialists prefer pneumatic actuated butterfly valves as they can operate valves in a hazardous environment without any manpower.
Now, let&#;s focus on the types of Butterfly valves. So first of all we check the basic butterfly valve mechanism and how it works. The butterfly valve is fitted in the middle of the fluid flow pipe. There is a rotational disc connected to a centric stem or shaft and that shaft is connected to the handle or actuator on the other end. This disc rotates quarterly to stop or allow the fluid flow to pass through.
The engineers have designed various butterfly valves to fulfill industrial needs. There are mainly three types of butterfly valves (as per their disc alignment):
Concentric Butterfly Valve
Double eccentric Butterfly Valve and
Triple eccentric Butterfly Valve.
As per body type or end connection, we can distribute them in four types:
Wafer type
Lug Type
Flanged
Butt Welded.
Let&#;s explore each type of butterfly valve one by one to know their specifications, advantages, usage, etc.
This type of valve is also known as the &#;Zero Offset Butterfly Valve&#;. In this type of valve, the disc and shaft are placed centered on the valve seat, as a result, the disc stays constantly in contact with the seat, which reduces the valve life.
This type of disc valve is used to control liquid and gas type media like in Water Treatment plants, Water distribution, Pumping installation, Fire protection, Natural gas & flare gas, etc.
This disc type valve is called a Double Offset Butterfly valve and High-Performance Butterfly Valve. This valve has two offsets from the center. First, the axis of the shaft is eccentric and the backside of the disc and behind the centerline of the sealing point. The second one is, the axis of the shaft is also not in the center of the valve or pipe. When the valve operates, the position of the disc creates a cam action. When the valve is in a fully open position, the disc does not touch the seat which provides a long life to the valve seat.
The double offset butterfly valves are very suitable for thicker media that have high pressure because their unique design prevents contact between disc and seat. This valve is generally used in Power Generation plants, Pulp & Paper industries, Chemical industries, Oil & Gas plants, Water & Wastewater Treatment Plants, and shipbuilding.
This valve is also known as Triple Offset Butterfly Valve. The two offsets are the same as double offsets, and the third one is created by a geometrically designed seat surface. This designed seat and disc create a conical angle, which allows the disc to seal the seat with no friction and come in contact with the shut-off positions. This design in the metal seat provides a bubble-tight shutoff.
The triple offset butterfly valves are very demanding because of the tight shut-off. In all the applications where the double offset valves are used and required for tighter shut-off, this is an ideal butterfly valve for that.
As per the three figures, we can easily get all the points of the Butterfly valve&#;s working principle. We all know that these valves are fitted in the middle of the pipe, so let&#;s check out &#;How are butterfly valves fitted in pipelines?&#;
As we read above there are four types of end connections or body types of butterfly valves that help to be fitted in the pipeline.
Wafer Type Butterfly Valve
This type of butterfly valve is installed between two flanged-ended pipes. As we can see in the below image:
This wafer type butterfly valve fits with the help of studs. The studs go through pipe flanges and tighten the valve between two flanges. This type of valve is useful to prevent any backflow in the system. It is designed to keep a seal against bi-directional pressure.
Lug Type Butterfly Valve
The Lug type butterfly valve also connects in between the flange-ended pipeline. There are threaded inserts on both sides of the valve body. Both sides of the flange-ended pipe connect to these threaded inserts with two sets of bolts without nuts.
This threaded insert setup allows disconnecting one side without disturbing the other one. The lug-type valve can be fitted at the end of the pipe and used as an end valve.
Flanged End Butterfly Valve
This type of valve, Valve has a Flanged body that matches the flanged end pipe and fits with the Nut and Bolts.
The Flanged End Butterfly Valves have threadless inserts on both sides. This design binds the valve to the pipe tightly.
This type of valve ends directly welded to the pipe for high-pressure applications.
Conclusion
These end connections impact directly the valve&#;s performance. If we select an inappropriate end valve for our application, the valve may start leaking from the joints. All the butterfly valves are used in all types of industrial applications, for High-pressure media and also for High-temperature services.
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