How do you install a butterfly valve?
Installation Procedure:
- Install lever (for manual operated valve) or hand-wheel (for gear operated valve).
- Using lever or hand-wheel, turn (clockwise) to ensure valve is in full closed position. ...
- If disc is not aligned parallel to the ends, for lever style – slightly loosen top plate (by loosening 2 bolts), turn lever clockwise until disc is centered & parallel ...
How to install handle butterfly valve manually?
Manual Valves Pneumatically Actuated Valves Install the bolts and nuts. Torque to 15.8 ft.·lb (21.4 N·m) in a cross pattern. Multiposition handle - install the positioner. Place handle on the butterfly disc shaft in the open position and tighten the screw slightly with a 5/16 in. wrench. Reinstall the top plug. Prior to putting the valve in ...
How to install butterfly valves?
How to Install a Butterfly Valves.
- Clean the pipeline of all contaminants.
- Determine the direction of the fluid, torque as flow into the disc may generate higher torque than flow into the shaft side of the disc
- Position disk in the closed position during installation to prevent damage of disc sealing edge
How to install the lug type wafer butterfly valve?
How to install the lug type wafer butterfly valve
- When the lug type wafer butterfly valve and the pipe are installed, the flanges of the two sides are respectively installed with bolts, so that the sealing surfaces of ...
- The lug type can be easily installed in the discharge position.
- The lug-type bolts are relatively short and do not need to pass through the entire valve body. ...
How do butterfly valves operate?
A butterfly valve regulates flow by starting, slowing, or stopping media. The disk opens and closes with a low-torque rotation of 90 degrees and works for any compatible application. Because they cost less and are lighter weight, the butterfly valve is often preferred over other types of valves.
How do you control a butterfly valve?
0:547:34How Butterfly Valves Work - YouTubeYouTubeStart of suggested clipEnd of suggested clipIt is in line with the body and it is fully closed. We move to the open position you can see it isMoreIt is in line with the body and it is fully closed. We move to the open position you can see it is now fully open and the disc is aligned perpendicular to the body.
When would you use a butterfly valve?
Butterfly valves are used for applications that require handling large volume capacities. It can be used for flow control and regulation and on/off service. Recent developments have permitted this type of valve to throttle more accurately and perform well in high-temperature and high-pressure applications.
Which way do you turn a butterfly valve?
A butterfly valve has a disc which is mounted on a rotating shaft. When the butterfly valve is fully closed, the disk completely blocks the line. When the butterfly valve is fully opened, the disc is at a right angle to the flow of gas or liquid.
How do I know if my butterfly valve is open or closed?
When the handle is parallel to the valve, it is closed, and when it is perpendicular to the valve, it is open. Butterfly valves are suited for use in garden irrigation, and they are also commonly used in space-restrictive applications. They have a slender design that makes them ideal for tight-fitting spaces.
What is butterfly valve not suitable for?
A lug-style butterfly is suitable for end-of-line service but wafer-style butterfly valves can not be used for end-of-line services. In case there is a maintenance requirement on the line having water style butterfly valve, the entire line needs to be shut down.
Why is it called a butterfly valve?
Butterfly valves are quarter-turn valves, meaning they go from completely open to completely closed in 90 degrees. The "butterfly" name comes from the fact that the disc, or "wings," moves around a central axis, which acts like the body of a butterfly.
What are the three types of butterfly valves?
There are 3 main categories of butterfly valves: Rubber-lined, Plastic-lined, and Metal....WeldedUsed for very-high-pressure applications.Because most plastic lined valves are limited to PN10/16 (150#) flanges, this type is rarely seen with plastic-lined valves.Garlock does not offer this type of valve.
How many turns does it take to close a butterfly valve?
The handwheel or nut must be rotated through 35-290 turns (depending on model) to open or close the butterfly valve.
Can you control flow with a butterfly valve?
Unlike gate valves, butterfly valves can be used for throttling or regulating flow as well as in the full open and fully closed position. The pressure loss through a butterfly valve is small in comparison with the gate valve.
What is the symbol for a butterfly valve?
The butterfly valve symbol is the only symbol where a full triangle is not used. If you refer to the first symbol, it is similar to a globe valve, but a triangle is not full. The alternative symbol is clearer in this case. For isometric symbols, you can see that there is no socket end butterfly valve.
Why do butterfly valves get stuck?
The valve has a pneumatic actuator rotating anti clockwise to open the valve. The reason for the sticking of the valve is suspected to be swollen rubber of the seat.
Can a butterfly valve be a control valve?
With so much crossover between the two valve types, you may wonder whether they're interchangeable with each other. Indeed, butterfly valves are a type of control valve because they deal with controlling and regulating the flow of materials in a process.
How many turns does it take to close a butterfly valve?
The handwheel or nut must be rotated through 35-290 turns (depending on model) to open or close the butterfly valve.
What is the symbol for a butterfly valve?
The butterfly valve symbol is the only symbol where a full triangle is not used. If you refer to the first symbol, it is similar to a globe valve, but a triangle is not full. The alternative symbol is clearer in this case. For isometric symbols, you can see that there is no socket end butterfly valve.
What is a butterfly valve?
In a more technical tone, a butterfly valve is a regulated rotary valve that consists of a rotating disk which directs the flow of fluid in a system. Basically, the disk is operable up to 90 degrees and that’s why it is called a quarter-turn valve. A butterfly valve controls the flow linearly and can be bi-directional.
How does a butterfly valve control flow?
In butterfly valves, fluid flow constriction and control is easily done by just turning the valve handle. As it is a regulating valve, it controls the flow rate of system through the help of actuators. Basically, when a flow monitor senses that a set parameter (differential pressure) has been reached, it will signal the valve actuator to close or open the valve.
What to Consider When Choosing Butterfly Valves?
When choosing butterfly valves for your operation, you would need to determine a few things before jumping in with the technical specifications of the valve. These basic information are the valve application, type of fluid, mode of operation and mode of installation, which are expounded below.
What type of valve is used for throttling?
For throttling services, you can use a high performance butterfly valve, which is a higher industry standard for larger applications. Generally, this type of valve is manufactured to process large capacities and oftentimes, viscous and seawater medium. We will get more into high performance butterfly valves later.
How to find the life of a butterfly valve?
Typically, you can find the operating life of the valve in the specifications sheet. Overall, butterfly valves promise less maintenance activities and can still give bubble-tight shut-off.
Why is my butterfly valve not working?
Therefore, it should be noted that in order to reduce maintenance work, butterfly valves should be properly installed during the commissioning stage.
What is AWWA valve?
For example, lightweight and AWWA butterfly valves are meant for water lines and potable water control applications. Other light duty valves can be used for aquariums and sprinkler systems. Some valves are also meant for fuel flow control.
What is butterfly valve?
The term “butterfly” in a butterfly valve is actually a disk that is connected to a rod. When this rod rotates the disk by 90° the butterfly valve opens or closes.
How are butterfly valves measured?
The size of butterfly valves used for control purposes is not dictated by the pipe nominal diameter. The size is determined based on the operating characteristics to achieve correct control characteristics. To determine the size, the opening angle characteristics should be considered. Typically, some butterfly valves are designed with approximately equal percentage characteristics over an opening of 60 0.
What are the components of a butterfly valve?
There are four main components in a butterfly valve: body, disk, stem and seat. Valve body: the body of the Butterfly valves fits two pipe flanges, the most common body design is lug and wafer type (Fig. 2). Butterfly valve disk: The disk (disc) is the element that stops the flow. For improving flow, sealing, and operating torque, ...
What is a triple offset butterfly valve?
For highly critical applications, a triple offset butterfly valve is used. The third offset is in between the disc and seat contact axis. This design results in minimal seat contact thus very less wear and highly efficient.
Why are butterfly valves so popular?
Butterfly valves are popular in industry because of their lightweight, fast operation, and low costs. These valves use handles, gears, or automatic actuators for operation as per the requirement.
How to control flow?
Flow regulation: Flow can be easily controlled or regulated simply by turning the valve wheel.Using a flow controller the process can be automated.
Where is the circular disc in a valve?
The circular disc (butterfly) of the valve is placed in the center of the pipe which allows a rod to go through it to an actuator, on the outer side of the valve. Using the handwheel, the metal disc is rotated to keep the disc parallel or perpendicular to the flow and it allows or closes the flow. So, the operating principle ...
How do butterfly valves work?
The construction of a butterfly valve is relatively simple, with the rotation of the valve disc controlling the fluid flow. In the closed position, the disc blocks the valve bore while in the open position, the disc is oriented perpendicular to the flow direction to allow flow. Butterfly valves generally provide bi-directional flow and shutoff capability. However, they are not full-bore, which renders them unsuitable for pigging or swabbing. The body material is ductile iron with an epoxy powder coat on both internal and external surfaces. The valves are typically operated by handwheels, gears, or actuators, or a combination thereof, according to the specific application requirement and technical specifications. We will be discussing the actuation methods later in the article.
What is butterfly valve?
Butterfly valves are a family of quarter-turn rotational motion valves that are used in pipelines to shut-off flow. It is often said that butterfly valves can be used to regulate the flow. However, we do not recommend doing this, as it can damage the valve disk and have a negative effect on the sealing properties.
What is the pressure rating of a Hawle butterfly valve?
The Hawle 9881k series double eccentric butterfly valves come in sizes ranging from DN 150 up to DN 1600 with pressure ratings of both PN 10 and PN 16. Additionally, design feature optimizations such as the double offset, or double eccentric (e1 and e2 as seen above) disc further reinforces its advantages of achieving a tight seat seal through full circle sealing, and improves the service life of internal components while lowering operating torque requirements.
Why are actuators less expensive for butterfly valves?
Due to inherently lower torque requirements, sizing and installing actuators are less expensive for butterfly valves compared to others, like gate valves.
How many ways can a butterfly valve be operated?
There are multiple ways to operate, or actuate, a butterfly valve - manual, semi-manual, or fully automatic.
What are the components of a butterfly valve?
Below are the major components of a butterfly valve. Besides, there are smaller more common components such as the bushings, bearings, and fasteners that are part of most other valve constructions as well. Details on some of the components on the actuation end, such as the handle, lever, gearbox, and handwheel will be covered in ...
How are valves operated?
The valves are typically operated by handwheels, gears, or actuators, or a combination thereof, according to the specific application requirement and technical specifications. We will be discussing the actuation methods later in the article. 04.
How does a butterfly valve work?
Understanding the way a basic butterfly valve works is pretty simple. It can help you to learn more about the components of valves. Butterfly valves are made of a number of components. The most important one is the metal disc. This metal disc is the one commonly referred to as the butterfly. The butterfly is mounted on a rod and when ...
What is butterfly valve?
A butterfly valve is a type of quarter turn valve. A quarter turn valve can open or close whenever the handle is turned 90 degrees (a quarter of a turn). The main function of these valves is to control the flow of liquids through a section of pipe.
What happens when a butterfly valve is opened?
However, if the valve is opened completely, the disc will be rotated 90 degrees then larger amounts of air or fluid will pass through. There are many other components that form the butterfly valve.
What happens when a valve is fully open?
When the valve is fully open, the metal disc or butterfly moves a quarter turn. The passageway is unrestricted allowing fluids or air to pass. In essence, the movement of the disc will depend on whether the valve is open or closed either partially or completely. If the valve is opened partially, it means that the disc will not be rotated ...
What are the components of a butterfly valve?
There are many other components that form the butterfly valve. They include the resilient seat, body, packing, a stem and an actuator. The resilient seat is mounted on the body of the butterfly valve in order to provide the proper seal.
Do butterfly valves work manually?
There are those which offer high performance in systems like large pump lines and front suctions. Butterfly valves can also be used in automobile systems.
What is butterfly valve?
Butterfly valves are a quarter-turn valve that has a plastic or metal disc in the middle that rotates on a metal rod or "stem." If the stem is the body of the butterfly, then the disc is the "wings." Because the disc always sits in the middle of the pipeline, the fluid is slowed slightly as it rushes through an open valve. The following examples are a few jobs -- some specific and some general -- that butterfly valves are perfect for!
How many holes are in a butterfly valve?
Lug butterfly valves have 8-12 holes for attachment lugs. The flanges on each side attach to half of the lugs each. This means that the flanges are each independently mounted onto the valve itself. This creates a strong seal and allows maintenance to be done on one side of the pipeline without having to shut the entire system down. The main downside of this style is a lower pressure tolerance.
Why use butterfly valves in pool?
Butterfly valves are ideal for this task as they completely stop fluid when closed. They are also extremely easy to clean since they have such thin bodies. This is important to consider when pool water is involved!
Which is better, a lug or a wafer butterfly valve?
Basically, lug style valves are more convenient to work with and maintain, but wafer style valves can handle higher pressures. For more info on wafer butterfly valves vs. lug butterfly valves, read this great article. Check out our high quality, wholesale-priced PVC and CPVC butterfly valves by clicking the links below!
Can you use PVC valves for irrigation?
Using PVC valves to control water in a system is not difficult and can be extremely rewarding when done correctly. These valves are especially useful in home irrigation & gardening systems, homemade fish tanking piping, and other such home applications. Today we will be looking at a few different butterfly valve applications and why these pieces of equipment are so useful.
Can a butterfly valve be opened?
But if you use automatic actuation on your butterfly valve, it can be opened almost instantly. Protect your pipeline and other equipment with a butterfly valve!
Do butterfly valves take up space?
If you're just generally wondering where to use butterfly valves, systems with space restrictions are ideal. In small spaces, putting together an effective piping system can be challenging. Pipes and fittings don't take up too much room, but equipment like strainers and valves can be unnecessarily clunky. Butterfly valves typically require less space than ball valves and other types of shutoff valves, which makes them perfect for flow control in a tight space!
How does a butterfly valve work?
As a regulating valve, this is done through the action of the actuator that communicates with the stem and disc assembly of the valve. The degree of angular opening translates to an exact amount of fluid that goes through the valve. Thus, the flow rate of the system is controlled through the actuators.
What is butterfly valve?
Butterfly valves are used for applications that require handling large volume capacities. It can be used for flow control and regulation and on/off service. Recent developments have permitted this type of valve to throttle more accurately and perform well in high-temperature and high-pressure applications. Although butterfly valves can be used as isolation valves, the piping system should be carefully designed to eliminate system losses.
Where can you find butterfly valves?
Lightweight butterfly valves are mostly found in water lines and potable water control services. Other light-duty valves such as PVC butterfly valves can be used for aquariums and sprinkler systems. Some general butterfly valves are also meant for fuel flow control.
Why do food processing plants use butterfly valves?
Some food manufacturing processes require aggressive wash down procedures in which butterfly valves can be used for backflow prevention during this process. Backflow pre vention is necessary as food processing plants should be clean and operate in extremely sanitary conditions.
What is a high performance butterfly valve?
High-performance butterfly valves are economic and easy to install with less maintenance required. They are used in a vast number of industries. If you want to know more about high-performance butterfly valves and want to improve your piping system, you may contact us for more information.
Why do vortex valves form?
In order to do this, vortex formation should be eliminated or reduced. One of the causes of vortex formation is when flow is obstructed by the valve. It may happen in butterfly valves due to the interruption of water flow from its disc.
How do you operate an automatic actuator?
Automatic actuators can be remotely operated through a pneumatic system, hydraulic piston or electrical motor. Manual operation can be through a handwheel attached in a gear system above the valve that connects it to the spindle.
What is the difference between a butterfly valve and a pneumatic valve?
Electronic valves require a signal to the gearbox to open or close, while pneumatic valves can be either single or double actuated .
What is a single actuated valve?
A single-actuated valve is typically set up to require a signal to open with a failsafe, meaning that when power is lost the valve springs back to a fully closed position. Double-actuated pneumatic valves are not spring loaded and require a signal both to open and to close.
Is a butterfly valve more reliable than a ball valve?
They are small and, when actuated pneumatically, open and close very quickly. The disc is lighter than a ball, and the valve requires less structural support than a ball valve of comparable diameter. Butterfly valves are very precise, which makes them advantageous in industrial applications. They are quite reliable and require very little ...
Is a butterfly valve reliable?
Automated pneumatic butterfly valves are both reliable and durable. Reduced wear improves the valve life cycle, which reduces operating costs otherwise lost in working hours to maintain the valves.
