Key Questions to Ask When Ordering 2-Offset Butterfly Valve

Every facility, industrial plant, and process system needs suitable valves to help them keep operations running smoothly. If you’re looking for a reliable valve solution that offers both precise controls and minimal costs, look no further than butterfly valves! In this ultimate guide to butterfly valves, we’ll cover everything about butterfly valves. You’ll gain all the knowledge you need to understand how these industrial valves work in different processes – so get ready to open up the wingspan on your understanding of butterfly valves!

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FAQ about Butterfly Valves

Do you have a ton of questions about butterfly valves? Well, you’ve come to the right place!

Our FAQ about butterfly valves is here to help guide you through the decision-making process. We cover all the essential topics, from installation instructions to maintenance tips, ensuring you’ll have everything you need to make the right choice.

Don’t let your process get bogged down with a regular valve; choose butterfly valves and keep everything moving smoothly and quickly. With our FAQ about butterfly valves, you can be sure you’re getting all the information necessary to make an educated decision that will serve you well now and in the future.

What are butterfly valves?

Butterfly valves are industrial valves consisting of a disc or vane that is rotated inside a ring seat to control the flow of liquids or gases. They’re usually made from resilient materials, such as rubber and plastic, to ensure tight seals and reduce maintenance costs.

What Are butterfly valves used for?

Butterfly valves are used in a variety of applications. They’re often used to regulate the flow of liquids and gases in industrial, commercial, and residential applications.

What are the advantages of butterfly valves?

Butterfly valves offer several advantages, making them a popular choice among engineers and plant managers.

First, they provide precise flow control in tight spaces. This makes them ideal for applications where space is limited, or access is difficult.

Second, they require minimal maintenance due to their resilient construction materials.

Third, butterfly valves are very cost-effective, especially when compared to other types of valves.

Finally, butterfly valves can be used for high-temperature applications due to their heat resistance.

These advantages make butterfly valves a great choice for any application with limited space and budget constraints.

What are the disadvantages of butterfly valves?

Like any valve, butterfly valves come with a few disadvantages.

First, they can be difficult to install due to their size and weight.

Second, they may not provide the same level of control as other types of valves due to their limited range of motion.

Finally, they’re prone to leaking if the disc or seat is damaged over time.

These disadvantages should be considered when selecting a butterfly valve for your application.

Are butterfly valves better than gate valves?

The answer to this question depends on the application and desired performance. Butterfly valves offer precision control in tight spaces, while gate valves are best for applications that require shutoff of the fluid flow.

Gate valves are often used in applications with large amounts of flow; however, they tend to be more expensive than butterfly valves due to their complexity.

Why do butterfly valves fail?

Butterfly valves can fail for several reasons, such as worn or damaged seals and components, incorrect installation, or inadequate maintenance. It’s important to inspect the valve regularly and ensure that all components are in good working order to avoid failure.

Now that you have all the information about butterfly valves, you can be sure to choose the right valve for your application! With their precise flow control, low maintenance costs, and heat resistance capabilities, butterfly valves can provide reliable performance in various applications.

Why is it called a butterfly valve?

The butterfly valve is named after its disc, which resembles a butterfly in shape. The disc rotates on an axis to open and close the valve, just like the wings of a butterfly move up and down when it flies.

What are the three types of butterfly valves?

Butterfly valves come in three different types – high-performance butterfly valves, triple offset butterfly valves, and centerline butterfly valves. Each type provides its own unique advantages depending on the application.

High-performance butterfly valves are designed for applications that require precise control, such as those in power plants and refineries. Triple offset butterfly valves offer superior sealing capabilities to contain hazardous media and corrosive fluids. Lastly, centerline butterfly valves provide a low-cost solution for applications that don’t require precise control.

No matter the type of application or the process you need to control, butterfly valves can provide reliable performance at an affordable cost. From controlling water flow in municipal systems to regulating steam pressure in industrial plants, butterfly valves are a great choice!

Which gear is used in the butterfly valve?

A worm gear is typically used to rotate the disc of a butterfly valve, allowing for precise control over flow rate. The gear converts rotational motion into linear motion, allowing the user to precisely regulate the opening and closing of the valve.

Unfortunately, if this gear becomes damaged or worn out, it can lead to failure of the butterfly valve. Regular maintenance and inspection of the gear is critical to ensure the valve functions properly.

Can butterfly valves control flow?

Yes, butterfly valves are capable of controlling flow in applications ranging from water systems to steam plants. The precise control over flow rate allows users to regulate system pressure, temperature, and other variables depending on their specific needs.

How much pressure can a butterfly valve hold?

The pressure rating of a butterfly valve depends on its size, materials used, and features such as seal design. Centerline butterfly valves can handle pressures up to 150 psi (1 MPa), but high-performance butterfly valves and triple offset butterfly valves can meet class lb, even higher.

It’s important to select the right butterfly valve for your application in order to ensure it can withstand the pressure of your system.

Do butterfly valves need lubrication?

Some butterfly valves require lubrication in order to function properly. Generally, it’s recommended that you use a light oil or grease for regular maintenance and inspection of the valve. This will help ensure all parts are working correctly and reduce wear on the seals.

It’s important to refer to the manufacturer’s instructions when lubricating butterfly valves to ensure proper use and safety.

How long do butterfly valves last?

The lifespan of a butterfly valve will depend on the application, materials used, and frequency of maintenance. Generally, butterfly valves can last for many years if they are properly cared for and maintained regularly.

Regular inspection of butterfly valves is essential in order to identify any potential issues before they become larger problems. This will help ensure your system works at its optimum performance for many years to come.

No matter what type of application you’re using butterfly valves for, proper maintenance and inspection will help ensure reliable performance and extend the life of your valve.

How do you maintain a butterfly valve?

The best way to maintain a butterfly valve is through regular inspection and cleaning. It’s important to inspect the seals, shaft, and other parts for wear or damage on a regular basis. Additionally, you should clean the valve periodically with soap and water to remove any dirt or debris that could interfere with its operation.

Finally, if the butterfly valve is exposed to high temperatures or corrosive fluids, it’s important to regularly lubricate the seals and other parts. This will help ensure optimal performance of your butterfly valve for many years.

With proper maintenance and inspection, butterfly valves can provide reliable performance at an affordable cost. Whether you’re controlling water flow in a residential system, or regulating pressure in an industrial plant, butterfly valves are a great choice!

With this knowledge about butterfly valves, now you know why they’re such a popular choice for controlling flow and regulating pressure in many different applications. With proper maintenance and inspection, butterfly valves can provide reliable performance at an affordable cost.

6 Factors to Consider When Choosing a High-Performance Butterfly Valve

To ensure that you have the most appropriate butterfly valve for your application, please consider the following 6 factors when selecting a butterfly valve.

1. Functional – Body Type

According to the design structure, the butterfly valves can be divided into centerline butterfly valve, double eccentric butterfly valve and triple eccentric butterfly valve. The centerline butterfly valve is generally used for on-off functions, while the double eccentric and triple eccentric butterfly valves can achieve both on-off and flow control functions.

2. Environment – Body Material

Butterfly valves can be made from a variety of materials, and when choosing a butterfly valve material, it is important to consider the role of these materials in the environment. Butterfly valves can be non-metallic or metallic. The most common butterfly valve materials are ductile iron or carbon steel, as they are readily available and inexpensive. However, these materials are not corrosion resistant, so in applications that are prone to corrosion, we should choose a stainless steel or alloy steel butterfly valve. Although stainless steel or alloy steel costs more, it is resistant to both corrosion and high temperatures. In extreme conditions, such as high pressure drop, strong corrosion, and the presence of solid particle impurities may require the use of a special material butterfly valve.

3. Media – Seat Material

When selecting a butterfly valve, it is critical to know what fluid is passing through your application, whether it is a gas, liquid or slurry. The type of medium will affect the sealing performance of the valve. Butterfly valves used in gas systems require a minimum specified leak rate at a specific operating temperature and pressure. Valves used for liquids require a tight seal to prevent liquid leakage. And butterfly valves for slurry media need to have a reliable wear resistance to ensure tight closure.

Slurry fluids, because they contain solid media, require a seal that is flush and smooth with the inside of the pipe to avoid fluid obstruction and prevent media buildup at the valve seal from affecting valve closure. In addition the media containing solid class is easy to wear the valve seat, these materials are easy to be stuck between disc and seat, therefore, in this condition, butterfly valve should try to choose metal to metal design.

4. Connection Type

There are three types of connection for butterfly valves, lug type, wafer type, and flange type. According to the engineering system requirements, we provide the right connection type to meet pipeline installation.

5. Pressure Drop – Valve Size

The on/off butterfly valve generally follows the size of the pipeline to select the corresponding valve size, but for the control type butterfly valve, the parameter of pressure drop needs to be considered in the selected size. Pressure drop refers to the change in medium pressure between the valve inlet and outlet. For example, for regulating flow conditions, if the butterfly valve is fully open, but the pressure drop is not large enough, this means that the valve cannot control or change the fluid flow well until it is in a position close to fully closed (the pressure drop change does not occur until the small opening). In this case, we need to choose a smaller diameter butterfly valve to meet the actual pressure drop or flow requirements.

6. Operation Speed – Operated Type

In many working conditions, there are requirements for valve closing time, in order to ensure the safety of the whole system operation and cost saving. So when selecting a butterfly valve, we need to consider the system’s operating speed and application requirements for the butterfly valve. If the system requirements must be quickly isolated or stopped, the butterfly valve needs to be equipped with fast-acting actuators. For example, by hydraulic or pneumatic actuators combined with solenoid valves to meet the fast action requirements. Some electric actuators have relatively high motor speeds, and it can also provide reasonably fast action. However, in most cases, where fast closing conditions are required, we give preference to pneumatic or hydraulic actuation structures. Quick-opening butterfly valves are not suitable for regulating the flow of fluids.

If the fast isolation function is not required, then refer to the energy source that can be provided on-site, and if the air source is convenient, then use a pneumatic actuator. If it is easier to provide a power source, then use an electric actuator.

Maximizing Efficiency Through High-Performance Butterfly Valves

High-performance butterfly valves offer the highest level of efficiency due to their ability to open and close quicker than other valve types. Their single-piece construction reduces installation time and allows for higher operating speeds. Triple offset butterfly valves provide increased resistance to vibration, as well as a greater range of pressure settings than standard models. This improved performance requires less energy to operate, allowing for cost savings across the board. Butterfly valves are beginning to replace the more traditional gate and globe valves due to their improved performance properties. Although butterfly valves have a higher initial cost than other types of valves, they provide greater long-term value due to their energy efficiency and reduced maintenance requirements. Butterfly valves can be used in a wide range of industries and applications, making them a great choice for any system.

For more detailed information about butterfly valves, contact one of THINKTANK’s experienced engineers today to learn how they can help you optimize your process. With the right high-performance butterfly valve, you can maximize efficiency while minimizing costs.

Increase Productivity By Utilizing a High Quality, High-Performance Butterfly Valve

The key to achieving maximum efficiency lies in selecting the right valve for your system. High-performance butterfly valves are designed specifically to handle the rigors of industrial production and deliver reliable, high quality results. Their improved performance over other types of valves makes them a must-have component in any piping system. From controlling air flow to regulating temperatures, butterfly valves are capable of providing precise control while reducing energy costs.

In addition, butterfly valves require less maintenance and provide longer service life than other types of valves making them an ideal choice for any production environment. With their superior performance capabilities, butterfly valves can increase productivity by ensuring product quality and minimizing downtime.

Conclusion

Now you know all the essential information about butterfly valves, you can be sure to make the right choice for your specific application! With their precise flow control, low maintenance costs, and heat resistance capabilities, these valves can provide reliable performance in various applications.

If you’re in the market for a valve, the butterfly valve is your go-to! From on/off and throttling needs, our butterfly valves are sure to be the perfect addition to your system. Cut through your competition with these reliable yet efficient valves.

Our butterfly valves stand out with their ability to provide just the right pressure for any system. Our range of capabilities makes them one of the most versatile valve options – designed for whatever challenge you may face. On top of that, our butterfly valves are highly reliable and aesthetically pleasing – with both manual and automated versions to choose from. Whether you’re looking for convenience or need something tough enough to withstand even the toughest conditions, our valves are sure to meet your needs.

For an extra bit of flare, all our valves come with compact and unique design choices, making them great fits for modern systems! With such a wide array of possibilities and benefits, it’s no question why so many people swear by our butterfly valves. So don’t wait another moment—just freely contact us for an instant quote.

If you are looking for an easy installation and low-cost valve for fluid flow control and throttle with a tight shut-off, then look no further. You’re probably looking for a butterfly valve.

We don’t exactly know what and where you will be using it for, but in this guide, you will find plenty of things insightful about Butterfly Valves. First, you will learn the basics on butterfly valves, its operation, installation and maintenance. Then, we will show you how a designer, engineer and investor thinks and does before actually buying high-performance butterfly valves.

Beware that this IS an actionable guide. You might want to take down notes which can help you decide on how to choose and purchase butterfly valves.

Contents of this Guide:

What is a Butterfly Valve?

A butterfly valve is a quarter-turn valve that initiates throttling and flow control of fluids. Given its name, you can easily visualize a thin metal disc that “flutters” about a fixed axis (stem assembly). The opening and closing mechanism allows and restricts the flow of a medium between an upstream and downstream pipe.

What type of valve 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. The configuration and operation of the valve is similar to a ball valve, but it is lighter and less costly.

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.

For more 2-Offset Butterfly Valveinformation, please contact us. We will provide professional answers.

You can find butterfly valves typically in piping systems delivering large volumes of fluids. These valves are delicate and not recommended to handle dry bulk solids as they can choke or break the butterfly valve.

The operation can be through a packing from a pneumatic actuator, an electric motor, a solenoid or a hydraulic piston and cylinder. Either way, this type of valve is the most economical and the easiest to handle. Butterfly Valves are also more affordable than other types of valves.

Advantages

Here are some of the advantages of butterfly valves compared with other valve types.

• Lightweight and compact
• Easy to install
• Low-pressure loss
• Low maintenance
• Simple, rapid operation

Disadvantages

• The disc can interrupt flow even when it is open
• Not recommended for high differential pressures

What are Butterfly Valves used for?

Butterfly valves are used in many industrial applications such as:

• HVAC
• Vacuum service
• High-temperature applications
• Refrigeration and Air Conditioning systems
• Irrigation and agricultural needs
• Corrosive processing
• Lubrication
• Petroleum Industries
• Wastewater treatment
• Slurries
• Sanitary valve applications
• Sprinkler and fire protection systems

When it comes to choosing a butterfly valve type for a specific application, one can look into a pile of different valve classifications. Seat, body and disc materials are varied depending on the service they will be used.

Regulating Fluid 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.

To control a regulating valve remotely, it must have a flow controller which automatically communicates with the valve mechanism based on the flow rate.

Flow Isolation

Butterfly valves are used typically in low pressure and low-temperature applications. They are lightweight and easy to manipulate and its quarter-turn action can also be used for flow isolation.

Backflow Prevention

In food industries where there are aggressive washdown processes, butterfly valves can be used for backflow prevention. This is necessary, from standard regulations, as it is aimed in food processing to deliver procedures in sanitary conditions.

General Butterfly Valves for Smaller Processing Units

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.

High-Performance Valves for Heavy-duty industry applications

For large and heavy-duty applications such as in oil and gas industries or high-pressure controls, high-quality and high performance butterfly valves are needed. These high-grade valves are certified and quality tested to meet quality demands and international standards.

Constant Load Applications

It should be noted that even though butterfly valves can handle large volumes of liquids, care is needed when controlling its load. This type of valve has a limited capacity in handling small load changes as only allowing a few millimeters opening is equivalent to a large volume difference. However, designs can be enhanced to diversify its control range, especially in larger applications where pressure is intricately regulated.

Parts of a Butterfly Valve

Generally, there are four main parts: the stem, disc, seat and valve body.

Valve Body

The valve body fits between the pipe flanges. It holds the other valve component into place. The valve body can be lug-type or wafer type.

It can also be made of different materials depending on the application. For example, Carbon steel is a general type of valve body used in common applications that do not require corrosion resistant properties. Stainless Steel, Nickel Alloy and Titanium Alloy, on the other hand, can be used for corrosive environments.

Disc

Attached to the valve body is the disc that functions as a gate that stops fluid flow. Again, it can be made from different materials depending on application.

Seat

Lining the internal valve body is a strong elastomer or metal anti-leak seal that secures the disc in place. It main function is This can be soft seated or metal seated. Soft seats (PFTE/RTFE) can be made of O-rings or rubber rings, while metal seals can be inconel or stainless steel.

Stem

The stem is valve component that usually lies protected inside the disc in resilient valves. However, in high-performance valves, it is typically in contact with the fluid.

The stem connects the disc to the actuator, like a shaft connecting a propeller to a motor. Similarly, the rotary action of the stem initiated from the power of the actuator is transmitted to the disc, allowing the close and open position of the valve.

Types of Butterfly Valves

How many types are there?

Butterfly valves can be categorized in many types. The most known classification is by end-connection type (lug or wafer). But it can also be classified according to seat design, body material and offset design. Some even classify these valves according to their mode of operation.

But each classification can also be intertwining. For example, you need a specific design for severe, heavy-duty applications where vibration is high and the substance is corrosive. In this type of scenario you can use a lug-style (end-connection type), titanium alloy (body material type) butterfly valve – two different valve classification in a row.

What are the two body styles of butterfly valves? Classification by end-connection

• Wafer Type Ends – have a flexible seal that protects the system from backflows which occurs when bi-directional pressure occurs
• Lug Type Ends – has threaded “lugs” or inserts around its circumference that permit for bolt passages.

Seat Material

• Soft Seated (PTFE/RTFE) – a synthetic fluoropolymer that is highly resistant to chemicals as compared with other plastics. Plus, PTFE lined seat has a low coefficient of friction which makes it ideal for low torque applications. 

• Metal-to-metal (SS316 and Inconel) – Inconel butterfly valves are used for applications requiring heavy duty seats such as in handling bulkier fluids. On the other hand, Stainless steel butterfly valves can be used in processing corrosive substances as they have a higher resistance to corrosion than inconel.

Offset Design

• Zero Offset Butterfly Valves – Concentric disk valves have their seals line against the edge of the elastomer lining which ensures tight shut-off. The stem is mounted in a vertical axis at the center of the disk.
• Double Offset Butterfly Valve – The Double Offset or Double Eccentric Valve is a high performance butterfly valve which is designed with two offsets of the stem. The movement is calculated with a specific cone profile to address shut off of high pressure applications.
• Triple Offset Butterfly Valve – There are three offsets for triple offset butterfly valves all mounted eccentrically. This helps provide a tighter seal. In this type of valve, there is a combination of the double offset design and an additional offset of the disk seat axis.

Body Material

• Carbon Steel – This type of butterfly valve is relatively cheaper than other types of butterfly valve material, but it cannot be used for corrosive applications.
• Stainless Steel – specialize in corrosive piping applications. As the stainless steel material is a combination of iron, nickel, chrome (10.5%) and sometimes Molybdenum, it possesses both strong acid endurance and strength of steel.
• Titanium Alloy – This type of valve has the highest strength-to-weight ratio as compared with other metal valves. It is lightweight and corrosion-resistant.
• Nickel Alloy (Hastelloy) – one of the strongest and most versatile types of valve. They are used in specific applications that require extreme resistance to fluid impact and high and low temperatures
• Aluminum Bronze – corrosion resistant valves for seawater piping systems. A distinct feature of this valve is in prevents biofilm formation. Nickel aluminum bronze is a composition of 10% aluminum, 5% iron and 5% nickel.

For a more detailed discussion of butterfly valve types, you can refer here.

Valve Actuation

There are many ways to operate a butterfly valve. It can be manual, semi-manual or automatic.

Electric-Operated Valve – use an electric actuator for operating the valve in an open and close position.

Pneumatically-operated valves – Pneumatic actuators are used to operate these types of valves for shut-off pipelines. Pneumatic Butterfly valves are typically used for transferring compressed and pressurized air.

Hydraulic Piston – These types of valves are used for applications requiring huge impacts or force for opening and closing the valve.

Manual or handwheel operation – These types of valves are manually operated through a hand-wheel or crank. Hence, they are not automatic.

How Do Butterfly Valves work?

Check out this video to see how this type of valve work.

Installation

Here are few installation tips, as well as a checklist to take note of:

1. In order to check parts of the butterfly valve, you can be able to disassemble it in order to further inspect its parts. For guidance, you can check out this on assembly and disassembly of butterfly valves.
2. Before anything, see to it that the flange and pipeline are clean from foreign materials. These can damage the seat or disc and can also cause disc to movement restrictions.
3. Since resilient seated valves extend to both faces, gaskets are not needed.
4. In order to easily insert the valve body, spread the flanges and align the pipe-work. With this the valve body is inserted even with no contact to pipe flanges.
5. Partially open the valve disc to prevent the valve from jamming.
6. Insert the valve between the flanges, taking care not to damage the seat faces.
7. When you lift the valve, hold it by the locating holes. Also, you can tie up a nylon sling around the body or the neck.Make sure you do not lift the valve at the actuator or its operator.
8. Once the valve is placed and aligned in between the flanges, insert all the bolts before hand-tightening them.
9. Slowly open the disc. This will test if it has the right clearance form the inside of the pipes.
10. Afterwhich, a gradual closure of the valve should also be done to verify enough clearance from the disc to the pipe flanges.
11. Fully open the valve, and start to tighten all of the bolts.
12. To test proper clearances after fastening the valve in the pipeline, repeatedly fully open and close the valve. This ensures the valve functions well during operation.

Maintenance of Butterfly Valves

Valves, as having constant contact with fluids, are prone to rusting and corrosion. The applied grease on the butterfly valves should also be monitored.

1. Apply grease at constant intervals, based on manufacturer’s recommendations. To apply grease, the grease fitting is located at the top of the valve. Also, to ensure that the right amount of grease is placed, apply grease to the neck of the valve until old grease flows out and is replaced by newly applied grease.
2. For greasing the gearbox, a lithium-based grease is recommended.
3. If cleaning is necessary, you can use silicon-based lubricants and other silicon-based products.
4. When not used regularly, exercising the valve by rotating it once a month can ensure the valve will continually be operational.

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.

Valve Specific Application

The first thing you have to determine when choosing a butterfly valve type is to know what you will use it for. Do you need it for flow control applications such as regulating or stopping fluid flow?

Type of Fluid

Next is to know what type of fluid or substance will be circulating your system. Butterfly valves can generally accommodate liquids and gases, but not bulk solids. Also find out the properties of your media. It could be corrosive which requires stainless steel valve body and disc. However, for general fluids such as water, you can use carbon steel or cheaper alloys.

Mode of Operation

After knowing the type of fluid, you can choose the mode of operation of the butterfly valve. Manufacturers and suppliers usually have a range of choices for this. They would have manually operated, semi-automatic or automatically-operated valves. This would depend on the location of your valve, application, cost and on how often you need to turn on and off the valve.

Mode of Installation

Lastly, you should be able to see to it if you would need to flange the valve at both ends, weld it or screw it in between the pipes.

Upon determining these necessary information, you can now determine the technical specifications regarding your butterfly valve installation as coordinated with the manufacturer or supplier.

Capacity

The capacity includes the flow rate or the rate at which the material will pass through. This parameter also accounts for the safe internal pressure capacity of the valve. Make sure to check the butterfly valve specifications to ensure that you buy a valve sufficient to what your system needs.

Level of Precision

Each valve from a supplier specifies valve specifications which states the leakage volume or amount, if there is. It also indicates the shut-off position specs, the width of the passage and the volume of fluid that it can accommodate when fully opened.

Operating Life

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.

Pressure Drop

Pressure drop is an important parameter when sizing the valve for your specific application. It describes the difference in pressure which occurs between the outlet and inlet of the butterfly valve.

It is recommended that “If the pressure drop across the fully opened valve is not a large enough percentage of the total system drop, there will be little change in the fluid flow until the valve closes. In this case, a fast acting valve would be appropriate.”

Consider that 25% to 50% of the total system pressure drop of the butterfly valve should be absorbed by the valve.

How to Choose the Best Butterfly Valve Manufacturer

If you are planning to search for the most reliable butterfly valve manufacturer, there are a few things you should look for to know that you have chosen the right one. There are a pool of valve manufacturers to select from but how do you know you have fished out the right one?

Let us guide you with the following questions to help you choose the best butterfly valve manufacturer:

How to inspect butterfly valves?

First is inspection. You can’t buy a product you haven’t even inspected. Here are some of the things you should check in the butterfly valve:

• Check the valve body if it has scratches or deformations or cracks. If there is, this can result in the wrong positioning of the valve during installation so be wary of this. Also check if the seal is new. If there are visible cracks, it means it’s old.
• See if the disc is secured and there’s no deformations. Also examine if it can perfectly seal on the seat.
• Examine the seat if it is new.
• See that the stem is straight and not deformed.
• Examine the condition of the o-ring and packing gland.

Do they have the proper certification?

A butterfly valve supplier should have an ISO certification. Some valve manufacturers place this on their websites. Having this certification ensures that the facility meets the valve standards and quality in their manufacturing process and end products. It also notes that the manufacturer takes full responsibility for their product quality. You need to see their ISO certification first before you make any purchase for your own safety.

What is the cost?

Cost is actually one of the first things clients look for. For this, you can either see butterfly valve prices online or you can contact specific valve suppliers. If it’s a physical conversation, chances are, you can readily negotiate. However, you might want to see first the cost of China butterfly valve manufacturers as they offer huge savings on valve price. Again, to make sure that you are getting a high quality valve, you should look for proper company certifications.

Is there an After Sales Service?

The best manufacturers provide after sales service. This is one of the most crucial aspects in choosing a valve provider. When you see a lot of good testimonials about the company, it must mean they provide good quality service and perhaps they are true to their word. Also, valve suppliers who have professional staff ready and willing to solve your product problems are the best companies. So you should carefully choose who among the valve suppliers actually care.

How about repair services?

It is not uncommon that a few problems may arise upon installation of the butterfly valve. Although this can barely happen if you install it right, there may be times that it is not your fault why it does not work well. Manufacturers who provide clients with the best repairing services are top-notch.

These services may range from repairing to replacing your valve part and accessories.

Since Huamei is a butterfly valve manufacturer, we provide professional repair service along with our after sales service. Repair service may include repair, replacement, overhaul or instrumentation if necessary.

Do they have Warranties?

Warranties are protectional tools which ensures that you are protected from defective products over the span of the warranty period. Be sure to look for a valve manufacturer that promise product warranty.

Huamei offers 18 months warranty, complete with customer support, repair services and aftersales service to ensure that you get the best experience with your purchased high performance butterfly valves.

Do they have a good company reputation?

It also matters that the supplier/manufacturer has a good reputation which reflects the quality of the product they deliver, the services they provide, and the response time on queries. You can verify this by simply checking their testimonials, history and ratings from other customers.

Frequently Asked Questions

Have some confusion? Here, we have gathered some of the most famous FAQ about butterfly valves that may answer your question in mind. However, if you did not find the solution here, just contact us for more information.

1. Are butterfly valves good for throttling?

They are mainly used for regulating large fluid flows, including viscous slurries, but it should be noted that they are not meant for precision throttling.

2. Do butterfly valves require gaskets?

Butterfly valves are available with built-in elastomer seal that rests on flanges to prevent leaks. So most of them do not require additional gaskets.

3. Can Bi-directional high-performance butterfly valve supply for dead-end services?

Bidirectional high-performance butterfly valves can be used for dead-end service. But it should be noted that for such service, you cannot subject it in high-pressure applications.

A valve used for a normal service with KPA can be used on a dead-end service but with only 500KPA. The high pressure may tend to cause the seat retainer to unload. The seat retainer may be bolted to prevent this, but the easiest way is to install it with a bolted flange. This flange can support the seat retainer.

4. Can a butterfly valve be used for flow control?

Yes. Butterfly valves, like needle valves, have good control capacities.

5. What is the difference between the ball valve and butterfly valve?

The butterfly valve with the same specification as the ball valve is usually cheaper in price and easier to install. Easier maintenance may go in recognition to ball valves as butterfly valves have a disc that can block some impurities that got stuck. Furthermore, ball valves are used in most high-pressure applications because they are more suitable for high differential pressures as compared to butterfly valves.

Butterfly valves are simpler in design, having lesser moving parts. Ball valves material and torque use is only low for narrower pipe diameters. For butterfly valves, it may start from DN 50mm and above.

6. How to Avoid Problems with Butterfly Valves?

Most of the major problems with butterfly valves are a result of poor installation and not the device itself. Therefore, it should be noted that in order to reduce maintenance work, butterfly valves should be properly installed during the commissioning stage.

• One of the things that should be inspected during installation is the elastomer seal. It tends to move towards the face of the valve and gets compressed while you install it. So its effects, it will easily wear away and will not effectively perform its duty of sealing the valve during operation. Hence, care must be put when installing the valve so it should not conceal the seal material.

• Another scenario is when the disc extends outside the surface of the body and close in with the valve. Therefore, it should be inspected that the disc can turn freely while it enters the flanges.

Conclusion

So there. We have finally reached the end of this guide. We hope that it has given you a better understanding of a butterfly valve; its operation, maintenance and installation. Most importantly, we hope that it gave you an idea on how you can choose and buy butterfly valves from manufacturers/suppliers.

Contact us to discuss your requirements of Cast Steel Globe Valve-DIN. Our experienced sales team can help you identify the options that best suit your needs.