Butterfly Valve

Your Professional Butterfly Valve Supplier

Our company owns a full set of equipment,complete processing and testing methods.The establishing of CAD valve design center and three-dimensional simulated manufacturing experimental design system ensures that new products with high quality can be developed promptly.Implementing perfect quality assurance system,our company is making unremitting endeavor for obtaining API certification on the passing ISO 9001, CE, API 6D International Quality Certification.

Reliable Product Quality
Implementing perfect quality assurance system,our company is making unremitting endeavor for obtaining API certification on the passing ISO 9001, CE, API 6D International Quality Certification.

Wide Product Range
Types of products include gate valve , globe valve, ball valve, check valve,plug valve,metal sealing butterfly valve as well as high temperature and high pressure power station special valve.

Advanced Equipment
Our company owns a full set of equipment,complete processing and testing methods.The establishing of CAD valve design center and three-dimensional simulated manufacturing experimental design system ensures that new products with high quality can be developed promptly.

Excellent Customer Service
We guarantee to reply clients within 24 hours and solve your problems in the first time with phone call. We offer field service and technical training upon request and can appoint specialists to clients' sites for installation, instruction, and usage assistance if request.

What is Butterfly Valve?

A butterfly valve is a quarter-turn rotary device used to control fluid flow in a piping system. It operates with a rotating disc positioned within the flow path. The disc is controlled by an external actuator connected through a stem. When the disc aligns with the flow direction, it fully blocks the flow. Conversely, when the disc is perpendicular to the flow, it allows the fluid to pass through. Opening or closing the valve requires a 90° rotation of the disc.

PTFE Seat Butterfly Valve

Construction: Centric/Center line type . Disc Type: Round Disc. Seat Sealing: PTFE, RPTFE,

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PTFE Seat Butterfly Valve

Design: API609,BS5155,ASME B 16.34,DIN3354,. Face to Face: ASME B16.10,EN 558,DIN 3202. Pressures: range PN6/PN10/PN16/5K/10K/CL150

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Rubber Lined Butterfly Valve

Concentric rubber seated butterfly valves.. GZP Concentric rubber seated butterfly valves with a field replaceable seat.

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2 Eccentric Butterfly Valve

GZPD342X Double Eccentric Rubber Seated Butterfly Valve is desined and manufactured according to AWWA C504, AWWW C516, BS EN593, ISO 10631, and GB/T12238.

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High Performance Butterfly Valve LUG

High Performance Butterfly Valve is eccentric structure for disc and sealing ring. It has compact structure, small volume, light weight, reliable sealing and long service life and other

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High Performance Butterfly Valve Wafer

High Performance Wafer Butterfly Valves are manufac-tured to the latest edition of API Standard 609 and tested to API Standard 598.

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Bi Directonal Butterfly Valve

Triple Offset Flange Butterfly Valve is used to prevent galling and scratches between the metal seat and the metal disc due to its unique design.

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Metal To Metal Butterfly Valve

Metal To Metal Butterfly Valve are manufactured and modified to the latest edition of API609, BS5155, ASME B 16.34 .

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Triple Offset Butterfly Valve

GZP 3-offset butterfly valves are manufactured and modified to the latest edition of API609, BS5155, ASME B 16.34 .

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Advantages of Butterfly Valve

Fast and Efficient Flow Control
One of the key advantages of butterfly valves is their ability to open and close quickly, making them ideal for applications that require frequent flow control. This is possible because the disc-shaped closing mechanism of a butterfly valve rotates a quarter-turn to open or close the valve. This allows for fast and efficient flow control, making butterfly valves a popular choice for applications that require frequent flow regulation such as water treatment plants, chemical plants, and oil refineries.

High Flow Rates
Butterfly valves are also known for their ability to handle large volumes of fluid flow. This makes them ideal for applications that require high flow rates such as water supply systems and irrigation systems. Butterfly valves can handle flow rates of up to 500 gallons per minute, making them a suitable option for applications that require high flow rates.

Cost-Effective
Another advantage of butterfly valves is their cost-effectiveness. Butterfly valves are relatively inexpensive compared to other types of valves, making them a popular choice for applications where cost is a major concern. Additionally, butterfly valves are easy to maintain and can be easily repaired in the event of damage or malfunction. This makes them a cost-effective option for applications that require frequent maintenance and repair.

Durability and Long Lifespan
Butterfly valves are also known for their durability and long lifespan. Because of their simple design, butterfly valves are less likely to experience wear and tear compared to other types of valves. This means that they can last for a long time, making them a cost-effective option for applications that require long-term flow control.

Versatility
Butterfly valves are also versatile and can be used in a variety of applications. They can be used in both high-pressure and low-pressure applications, making them suitable for a wide range of industries including water treatment, chemical processing, and oil refining. Additionally, butterfly valves are available in a variety of materials, including metal, plastic, and rubber, making them suitable for use with a wide range of fluids.

Types of Butterfly Valve

Concentric Butterfly Valves

Concentric butterfly valves are the simplest and most common type. They have a central stem and a disc that rotates around the stem. These valves work well for isolating flow and regulating flow in low-pressure systems. However, they may not be the best choice for high-pressure systems, as they can wear out quickly in these situations.

Double-Offset Butterfly Valves

Double-offset butterfly valves are also called high-performance butterfly valves. They have a stem that is slightly offset from the center of the disc. This design reduces friction between the disc and the valve seat, which makes the valve more durable. Double-offset valves are better for high-pressure systems than concentric valves. They can regulate flow with more accuracy and handle a wider range of pressures and temperatures.

Triple-Offset Butterfly Valves

Triple-offset butterfly valves are the most advanced type. They have a stem that is offset from the center of the disc and the seat, and the disc has a conical shape. This design provides even better sealing and durability than double-offset valves. Triple-offset valves are ideal for very high-pressure systems or extreme temperatures. They are often used in demanding industries like power generation and petrochemical processing.

Material of Butterfly Valve

Stainless Steel
Stainless steel is an alloy with a high chromium content (10.5-30%) and small amounts of nickel and molybdenum. It is renowned for its exceptional strength, toughness, and resistance to corrosion and weathering. The corrosion resistance is primarily due to the chromium, which forms a thin, protective chromium oxide layer that prevents oxygen from penetrating the material.

Carbon Steel
Carbon steel is an alloy with a carbon content of up to 2.5%. It offers good mechanical properties and is suitable for applications that do not have specialized requirements. Common grades of carbon steel used for butterfly valves include ASTM A216 WCB (Welded Cast B-grade) and LCC (Low Carbon Content).

Hastelloy
Hastelloy is an alloy made of nickel, chromium, and molybdenum, and was the first alloy developed by Haynes International, Inc. It is known for its high strength at elevated temperatures and its excellent resistance to corrosion, cracking, and both oxidizing and reducing agents.

Brass
Brass is an alloy composed of copper and zinc, known for its toughness, durability, and ability to withstand high temperatures. It is prized for its resistance to corrosion and biofouling, as well as its antimicrobial properties, which help prevent the growth of microbes and biofilms on its surface.

Nickel Alloys
Nickel alloys are renowned for their excellent resistance to corrosion, harsh environments, and high temperatures. They typically outperform stainless steel in extremely corrosive conditions. However, nickel butterfly valves tend to have a higher density and come at a greater cost.

Titanium Alloys
Titanium alloys offer a high strength-to-weight ratio and are well-regarded for their resistance to corrosion and biofouling. They are suitable for use in seawater environments and water treatment applications due to their non-toxic nature. Despite these advantages, titanium butterfly valves are also quite expensive.

Polyvinyl Chloride Butterfly Valves (PVC)
PVC is a strong and rigid material commonly used in pipes, fittings, and valves. PVC butterfly valves are known for their durability and resistance to corrosion. They are suitable for handling most chemicals, although they should not be used with hydrocarbons or aromatic compounds.

Chlorinated Polyvinyl Chloride Butterfly Valves (CPVC)
CPVC contains more chlorine than PVC and is produced through the free radical chlorination of PVC. This modification allows CPVC to handle higher temperatures, up to 93.3°C, and enhances its flexibility. However, CPVC is generally more expensive than PVC.

Polypropylene Butterfly Valves (PP)
PP (Polypropylene) butterfly valves are known for their exceptional strength and durability in harsh environments. They resist corrosion, biofouling, and UV degradation, making them suitable for handling a wide range of chemicals and corrosive agents. However, they have selective compatibility with certain organic substances and solvents.

Application of Butterfly Valve

Chemical and Petrochemical Industries

Butterfly valves play a fundamental role in the chemical and petrochemical industry as they offer efficient control of the flow of chemicals and hazardous materials. These valves are characterized by their compact design and their ability to regulate the flow in large-diameter pipelines. Their operation consists of a circular plate that rotates on a central axis, allowing the opening and closing of the conduit to be adjusted. In the chemical industry, butterfly valves are frequently used in the transfer of corrosive chemicals, flammable liquids, and toxic substances.

Food and Beverage Industry

Butterfly valves play an essential role in the food and beverage industry by providing an efficient and reliable solution for controlling the flow of raw materials, finished products, and cleaning liquids. These valves are widely used in various stages of the manufacturing process, from handling raw materials to final packaging. Their compact design and ability to provide a tight seal make them a popular choice in this industry. In the food industry, butterfly valves are essential for regulating the flow of ingredients such as liquids, pulps, and viscous mixtures, ensuring precise and consistent dosing. They are also used to control the flow of finished products, enabling efficient packaging and proper quality control.

Energy and Power Generation

In the energy and power generation industries, butterfly valves play a fundamental role by providing a reliable and efficient solution for regulating the flow of liquids and gases in piping systems. These valves are frequently employed in power plants, including thermal, nuclear, and renewable energy facilities. In power plant piping systems, butterfly valves allow for regulating the flow of liquids and gases at various process stages. They are used in the intake of water to turbines, controlling the amount of liquid admitted to generate energy.

Pharmaceutical and Biotechnology Industries

Butterfly valves are commonly used in the pharmaceutical and biotechnological industries for their ability to regulate flow at various stages of chemical, pharmaceutical, and biological product manufacturing. These valves provide a reliable solution for precisely controlling liquids and gases in pipeline systems, ensuring accuracy and safety in processes. In pharmaceutical production, butterfly valves are essential for directing the flow of active ingredients, excipients, and solvents.

Water and Wastewater Treatment

Butterfly valves are essential elements in the water and wastewater treatment sector, offering an efficient and reliable solution for flow control in water supply systems, treatment plants, and sewer networks. In water supply systems, butterfly valves regulate the flow of drinking water to consumers, ensuring equitable and efficient distribution. Their ability to operate in large-diameter pipes makes them ideal for applications in municipal and industrial networks, where robust flow control of large water volumes is required.

Butterfly Valves in the Pulp and Paper Industry

Butterfly valves are crucial in the paper pulp manufacturing sector for their ability to provide precise and effective control of liquid and gas circulation in various stages of production. In this sector, where closely monitoring flow is crucial to ensuring the quality of the final product and operational efficiency, butterfly valves stand out as an optimal choice.

Key Components of Butterfly Valve

Body
The body of the butterfly valve is the part that fits between the two pipes. This slim valve comes in two major body styles: wafer and lug. The wafer style body is the most economical of the two. It is connected to the pipes with bolt holes that run through the body of the valve. This design is easy to install and primarily used to prevent backflow in universal flow systems. However, it should be noted that they are not recommended for use in systems that require regulation. Lug style butterfly valves are slightly more expensive than their counterpart but offer a few distinct advantages. Lug butterfly valves are connected to the pipe through protruding lug holes on the outside of the body of the valve. With this design, the valve actually helps carry the weight of the piping throughout its body, unlike the wafer valve. This allows for removing piping from one side of the valve for dead-end servicing.

Disk
Both wafer and lug style butterfly valves have a disk inside, and this disk is what controls the flow of media through the valve, much like a gate in a gate valve or the ball in a ball valve. The disc of the valve can be either concentric or eccentric. The simplest of these two is the concentric disk. In the concentric design the stem passes through the centerline of the disk. Concentric valves are commonly used in low pressure applications. The eccentric disk design, however, has a stem that doesn’t pass through the center line, but rather behind it, in the opposite direction of the flow. The eccentric disk was first designed to help prevent contact of the disk and seal before it was fully closed to help prolong and improve life of the valve.

Stem
The stem of the butterfly valve may seem like a small part, but it plays an important role. The stem is what connects the disk inside to the handle outside. Without it, the valve would not be able to open or close, and what’s a valve if it can’t open or close? The stem has two different designs—wetted or non-wetted—which refers to the protection on the stem. Non-wetted stems are protected against any potential corrosive or erosive media in the line. Wetted stems are not protected against these and, thus, must be made of material that is compatible to the media flowing through the line.

Seat
The seat of a butterfly valve is made of different elastomers or polymers and is either bonded to the body or pressed or locked down. The seat runs along the inner diameter of the valve. When the disk presses along the seat, they seal together to stop the flow. When butterfly valves were first designed the metal of the disk sat against the metal body, which did not provide a tight, leak-free seal. The addition of elastomers or polymers to the design of the valve is what helps provide the leak-proof seal.

How Does a Butterfly Valve Work?

A butterfly valve is quite similar to a quarter-turn valve. The valve will shut or open at any time you turn the handle 90 degrees (a quarter of one turn). The principal function of these valves is to regulate fluid flow across a pipe area. Butterfly valves are commonly employed in waste treatment systems.

Concentric butterfly valves work the same way as quarter-turn valves. Understanding how a butterfly valve functions is quite easy. It will allow you to understand the various components of valves.

Butterfly valves consist of a variety of components. The most important is the disc made of metal. The metal disc is often known as the butterfly. The butterfly is attached to rods and, if the valve gets shut, it stops the flow of fluid. A quarter-turn moves the butterfly or disc made of metal once the valve opens. The passageway is free of obstruction, allowing air, fluids, or other fluids to move through.

The motion of the disc is contingent depending on whether the valve opened or closed or if it is closed fully or partially. When the valve has been closed only a portion of the time, it will not be rotated for a full quarter turn, and therefore does not provide unrestricted flow.

This means that lesser amounts of air or liquid will pass through. If the valve is completely opened, the disc will be turned 90 degrees, and greater quantities of fluid or air will pass through.

Butterfly Valve Troubleshooting of Common Issues

Leakage

One of the biggest reasons for leakage is damaged disc seals. As you know, a disc is placed on the body. It provides seals and does not allow fluid to trip outside. However, with continuous pressure from fluids, these disc seals become weak.
Solution & Troubleshooting: You can apply grease or thick viscous gel to the seals. This will provide a short-term solution. However, changing the seals for a permanent solution would be best. Applying gel is not recommended if the adjoining pipes carry gasses. To change the seals, remove the butterfly valve.

Sticking of Disc

Sometimes, the valve’s disc can get stuck. For example, once you open it, the disc will turn at a 90-degree angle. This movement will allow the flow of fluid. But upon closing, the disc won’t move and gets stuck. If you apply force, it could damage the body or shaft.
Solution & Troubleshooting: Occasionally, parts of the butterfly valve get dirty. The dust and debris start to accumulate between the parts. This accumulated dust prevents the disc from moving freely. All you need to do is clean those areas with a lubricant. Grease can ease this sliding and help in solving the issue. If you see any sign of rust, remove it immediately.

Noise and Vibration

The butterfly valve can produce noise and vibration. This issue is rare. It generally happens when fluid flows at a very high speed. The culprits are loose bolts and misalignment of the valve and pipe. The vibration could be annoying for the operators. If it lasts for a long time, it can destroy the internal component of the valve.
Solution & Troubleshooting: Multiple factors contribute to vibrations. The primary reason is loose bolts. Moreover, the unbalanced valve between pipes can also be a big reason. The best solution is to reinstall the butterfly valve between the pipes.

Slow on and off of the disc

Sometimes, the disc shows lags when moved with the handle. It does not open or close quickly. This lag or delay will have a more prominent impact if the issue remains. However, it does not impact the valve’s performance during work.
Solution & Troubleshooting: You can keep using the valve even if this issue occurs. Once the pipes are idle, you can take the butterfly valve out to see the issue. Generally, this issue happens due to friction within the valve stem.

Actuator Malfunction

The Actuators of the butterfly valves are very durable. They generally don’t show any malfunctioning. However, if the valve is used for years, the actuator can get stuck in one place. The disc goes through a 90-degree turn while opening and closing. However, this disc does not move with a faulty actuator.
Solution and Troubleshooting: This issue is more common in old valves. Imagine you use a butterfly valve to join pipes. The valves remain there, holding two pipes for many years. The water keeps flowing through it. You never feel the need to stop the flow by closing the disc. In this case, the actuator or handle may fail to work due to prolonged inactivity.

What to Consider When Choosing Butterfly Valves?

Type of Fluid
The next step is to identify the kind of liquid or substance circulated through the system. Butterfly valves generally can handle gasses and liquids; however, they cannot accommodate bulk solids. Find out the characteristics of the media. It may be corrosive, which means it requires the valve body to be made of stainless steel as well as the disc. But, you can utilize carbon steel or less expensive alloys for common fluids such as water.

Mode of Operation
Once you know the kind of fluid, you will select the operation mode that the valve will operate. Manufacturers and suppliers typically have various options in this regard. The choice will be based on the area of the valve, its application, price, and the frequency at which you must switch off and on the valve.

Mode of Installation
Then, be aware of whether you need to flange the valve on both ends or if you need to weld it or screw it between two pipes. Once you have gathered this information, you will be able to identify the technical specifications for the butterfly valve you are installing as aligned with the manufacturer or the supplier.

Capacity
The capacity is the flow rate or the rate the material can pass through. This also includes the safety of the internal pressure capability for the valve. Be sure to verify the specifications for the butterfly valve to ensure you purchase the right valve for your system requirements.

Level of Precision
Every valve manufactured by a company has specifications that define the leakage quantity or volume. It also specifies the shut-off specifications, the passageway’s length, and the amount of fluid it can hold when fully open.

Operating Life
Typically, you will find the operational life of the valve in its specifications sheet. In general, butterfly valves offer lower maintenance requirements and still provide a tight, bubble-free shut-off.

Pressure Drop
Pressure drop is an essential aspect to consider when selecting the appropriate valve to suit your particular needs. It defines the variation in pressure between the outlet and the inlet of the butterfly valve.

Our Certifications

CE, ISO9001, API 6D, ISO14000, ISO18000

Ultimate FAQ Guide to Butterfly Valve

Q: What is butterfly valve basics?

A: 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.

Q: What are the requirements for a butterfly valve?

A: If possible, butterfly valves are recommended to be installed a minimum of six (6) pipe diameters from upstream components, and a minimum of four (4) pipe diameters from downstream components.

Q: What are the problems with butterfly valves?

A: Butterfly valves leak for a variety of causes. This could be one of the following

Q: What causes a butterfly valve to fail?

A: Rust buildup is the leading cause of butterfly valve failure. Due to rust, the parts start to deteriorate and malfunction. If the rust is removed, the valve will not show any issues.

Q: Can a rusty butterfly valve be repaired?

A: Yes. However, the extent of the damage determines the extent of the repair. A valve with severe rust will have to be replaced.

Q: How do you inspect a butterfly valve?

A: A visual examination is good enough for inspecting butterfly valves. You can start by checking the external surface. If you notice any rust or damage, it is a red light. Moreover, close attention must be paid to the valve body, disc, and seals.

Q: When not to use a butterfly valve?

A: Butterfly valves are not designed to handle dry bulk solids. They were designed for gas and liquid applications.

Q: How do you size a butterfly valve?

A: Length A – Length of butterfly valve body + stem endpoint.
Length B – Length from centerline x-axis to valve end.
Length C – thickness of the valve body.
Length F – length of the key.
Length H – diameter of stem.
Length J – Hole size.
K – thread size.
L – number of holes.

Q: How many turns does it take to close a butterfly valve?

A: The handwheel or nut must be rotated through 7-50 turns (depending on model) to open or close the butterfly valve.

Q: Does it matter which way a butterfly valve is installed?

A: Having the valve upright minimizes any side- loading of the bearings and liner, due to the weight of the disc. This is only important in the larger diameter sizes.

Q: How to inspect a butterfly valve?

A: After ensuring there is no leakage at the stuffing and other sealed parts, close the butterfly plate. Open the other end, if there is no leakage at the butterfly plate's sealing, it is considered qualified. The butterfly valve that is used for flow regulation can skip the sealing performance test.

Q: How do you tell if a butterfly valve is open or closed?

A: 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.

Q: How much pressure can a butterfly valve handle?

A: The best type of butterfly valve for high-pressure systems is the triple offset butterfly valve. Of the three types, the triple offset is the most advanced with lower emissions and is designed to work with various environments. Its heat tolerance is 1200°F as it can withstand 1,480 PSI of pressure.

Q: Why use butterfly valve instead of gate valve?

A: Butterfly valves are part of the quarter-turn family of valves and can be shut off much faster than gate valves, which are multi-turn valves. Gate valves are preferable for high-pressure systems whereas butterfly valves are preferable for larger port sizes.

Q: What is the most common use of butterfly valve?

A: Butterfly valves can be used across a wide range of applications. They perform well in large volume water applications and slurry applications. The following are some typical applications of Butterfly valves: Cooling water, air, gases, fire protection etc.

Q: What can go wrong with a butterfly valve?

A: Butterfly valve, ubiquitous in industries such as oil and gas, water treatment, and power generation, can fail for a variety of reasons, including worn or damaged seals and components, incorrect installation, or inadequate maintenance.

Q: Do you use a gasket with a butterfly valve?

A: Gaskets play a crucial role in ensuring the reliability and efficiency of wafer butterfly valve systems. These sealing components, typically made from materials such as rubber, Teflon, or metal, are designed to create a leak-proof barrier between the valve and the adjoining pipe flanges.

Q: What is the alternative to the butterfly valve?

A: One such alternative is the gate valve, renowned for its ability to handle high-pressure applications and provide tight sealing. Gate valves operate by lifting a gate out of the path of the fluid, allowing unobstructed flow when fully open.

We're well-known as one of the leading butterfly valve manufacturers and suppliers in China. If you're going to buy high quality butterfly valve at competitive price, welcome to get more information from our factory.

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