Every industry has a demand for sanitary fittings, but the pharmaceutical industry takes the crown in this race. There is very little margin of error in this industry, as we are talking about medicines. Medicines that cure our headaches, medicines that save our life! As it is evident, the standard sanitary fittings aren’t meant for manufacturing drugs. Hence, there is a need for biopharmaceutical sanitary valves, which we are going to discuss in this brief. Biopharmaceutical fittings (BPE) are a perfect solution to this problem.

The Difference Between Sanitary Valves and Industrial Valves

On the face of it, there seems to be very little difference between biopharmaceutical fittings and 3A sanitary fittings. However, there are some critical differences in the styles of the two fittings that set them apart. The BPE fittings comply with the ASME-BPE standards. It is pertinent to mention it again that sanitary valves play a critical role in the production of pharmaceutical products. Therefore, it is natural that these vales feature high tolerance and clean interior surface finishes. This is in contrast to standard fittings. Furthermore, material requirements are a lot different than 3A sanitary standards. 3A standards are industrial valves that find plenty of uses in industries like food, beverage, and dairy.

What are the Main Types of Sanitary Valves?

Fun fact: It is possible to build sanitary valves with thousands of variations! However, for the sake of convenience, we can classify sanitary valves into three key types. This classification is made on the basis of their mechanical motions. These three classes are linear motion, rotary motion, and quarter-turn valves. Let us talk about them briefly in the following lines of this brief:

1.    Linear Motion Valves

These valves use a closing member. As they move in a straight line, they permit, stop or choke the medium’s flow. You might have come across some types of linear motion valves already. These include gate, diaphragm, pinch, lift check valves and globe valves.

2.     Rotary Motion Valves

In this type of sanitary valve, a valve closure member is used. It is this valve that permits motions on the cylindrical or angled paths. Some of the common types of rotary motion valves include ball, eccentric, swing check, and butterfly valves.

3.    Quarter Turn Valves

In essence, these are just like rotary motion valves. The key point to note here is that these valves require only a quarter-turn stem motion to switch their positions between fully open and fully closed.

An important that must be kept in mind is that a sanitary valve is defined by a set criterion. Unless these special sterile requirements are met, a valve cannot be deemed sanitary.

Let us talk a bit about the sanitary ball valves and butterfly valves in this space as well. Coming towards the sanitary ball valves first, well, they use a ball with a hole that is drilled through the middle swivel mounted to the valve body. The sanitary ball valves operate at their maximum when the ball is in line with the pipe. However, it is quite possible to rotate the hole in the ball away from the pipe’s direction. This chokes the flow rate. It is cut off completely once the hole is at 90 degrees in the pipe direction.

Often, there is a question about the nature of the butterfly valves. Do they have a place in the sanitary club or not? The answer is, yes, of course, they are sanitary valves. They feature a single eccentric structure. Their soft seal is predominantly different from the middle section. Their characteristic features are compactness, lightweight and minimalistic composition.

Who Uses Sanitary Valves and Why?

Now, let us talk a bit about the end users of sanitary valves. Usually, biopharmaceutical sanitary valves are used by folks concerned with the pharmaceutical industry, biotechnological facilities, and certain other purity industries. What makes them suitable for use in these industries? Let us find that out in this section of the discussion!

In medical industries, contamination is the last word you would want to hear. We don’t need to build on why it is a taboo word there, right? Now to the real point, if there are services in the valves, then the chances of contamination increase by a significant factor. So ideally, valves that come without any services sound like a perfect pick for industries that we have mentioned in the earlier lines of this brief, right? Guess what? Sanitary valves come without any services! So that contamination problem is solved alright, what do you think?

Cleaning is cumbersome sometimes. When we are talking about mega industries like the pharmaceutical industry, then we need to pay more attention to streamlining the process. That’s where sanitary valves save the day. Because they are not stained easily, they are a super convenient option. Now you might not realize it at first, but the extensiveness of the process is directly proportional to the amount of cleaning that needs to be done afterward!

Sanitary valve manufacturers in USA are making gold as they are a perfect pick for anyone who is weary of polishing and smoothing valves all the time. Do you know who that is? Pharma boys! Rust is enemy number one in all such settings. It can complicate things to a great extent. Hence, sanitary valves are a perfect pick again because they are made of polished stainless steel.

Standards & Certification

ASME-BPE

ASME has a BPE committee that acts as a governing body for BPE standards. The ASME-BPE standard is concerned with all aspects of BPE fittings. These aspects include tolerances, interior surface finishes, product markings, composition, and packaging. BPE certification implies that ASME has conducted an audit of a company. Companies that hold ASME-BPE certification can proudly flaunt that they are meeting the required standards. Such audits are a must for compliance. Companies who undergo the said audits have permission to label their products with ASME certification marks.

One of the key requirements of ASME-BPE standards is that the BPE fittings must be consistent in terms of dimensions. It doesn’t matter who is producing them; the manufacturer becomes an irrelevant topic in this discussion. Then, these sanitary valves must also come with specific permanent markings on the outside of the fittings. These markings include heat number, material type, company, manufacturing country, surface finish, and the letters BPE inscribed on them.

An important question that arises here is: how is material verification performed in the case of BPE fittings? Well, it is done so by using a niton gun. Thanks to this clever invention, identifying a fitting in terms of its chemical composition is fairly easy. All that it takes is a single click! Performing this identification is extremely important since, without it, one cannot be sure about the materials that the end-users are getting.

Traceability

Traceability is one of the most important factors when we are talking about BPE fittings. It is absolutely essential that the chemical and mechanical make-up of the materials must meet the set criterion. Otherwise, the sanitary valves in question will not be given the due nod of approval. Here, talking about heat numbers is a must; they identify the manufacturing lot of the steel. Normally, heat numbers are marked on the outer side of the sanitary valves. Heat numbers must match up with the corresponding paperwork. This corresponding paperwork is dubbed Materials Test Reports. It serves as proof that the sanitary valves meet the specified standards.

MTR

Let us talk about Material Test Report (MTR) in this domain as well. It is an official piece of documentation from the mill; it specifies the mechanical and chemical properties of the steel. Its importance in material traceability and verification cannot be ignored. The MTR must be provided with every sanitary valve. Sanitary valve suppliers need to take care of these parameters.

Conclusion

So, that would be all from this brief. As it is evident from these lines, the biopharmaceutical sanitary valves have critical importance in medicine and related pharmaceutical industries. Precision and fine finishes are key parameters that distinguish them from their industrial counterparts. To ensure that nothing wrong has happened throughout the process, documentation and packaging have been given due weightage as well. It is these major points that allow users to trace back products to inception. Once the understanding is at the most perceptive level, users can easily pick the sanitary valve that is the requirement of the process.

Today, the industrial web is bigger than ever. It is getting more and more specific with every day passing. Biopharmaceutical industries needed something safer and more efficient to solve their quality woes and concerns. Sanitary valves are the answer, as it seems!

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What are Diaphragm Valves?

Diaphragm valves are bi-directional on-off throttle valves. They control the flow and speed of fluids through an area. Diaphragm valves regulate the area through which fluids enter or exit the system. The name diaphragm comes from a thin and flexible membrane that moves up and down within the valve’s body, causing it to open and close. Diaphragm valves can be made from plastics, single-use materials, and stainless steel. Stainless steel Diaphragm valves are easy to maintain, and they are clean and leak-proof.

How Do Diaphragm Valves Work?

Diaphragm valves are pretty similar to pinch valves in the way they work. The valve has a linear compressor that pushes the thin diaphragm into contact with the valve’s body. When the user decides to shut the valve, the actuator is pressed or turned, pushing the membrane to the edge of the valve, thus closing the valve.

Criteria for Selecting a Diaphragm Valve

You may encounter some problems specifying the correct valve size to use as there are no industry standard diaphragm valves. Below are some parameters you can consider when purchasing a diaphragm valve, so you can make the right choice.

● Valve size: The size of the valve is important since they have different throttling applications. As such, the size of the valve has a way of affecting the control of the fluids. To get the right valve size to use, ensure that the volume of the process fluid moving through the system is known. Hence, it’s important to know the state of the liquid, how it flows, as well as the viscosity and specific gravity of the fluid. Endure to also know the inlet and outlet pressures and temperatures.

● Deciding the Type of Actuator to Use: The actuator type will determine the size of the diaphragm valve you should select. Actuation types include electric motor, thermal, pneumatic, hydraulic, etc. This factor determines how the valve is opened or closed. The type of actuator you use depends on the force of the fluid flow through the system.

Advantages of Using a Diaphragm Valve

1. It serves as an on-off and throttling service valves
2. There is no case of stem leakage when using the diaphragm valve
3. The diaphragm valve provides tight bubble service
4. There are no pockets that trap impurities, slurries, and other solids.
5. Diaphragm valves have suitable linings that are resistant to chemical attacks.

Disadvantages of the Diaphragm Valve

1. Diaphragm valves are not suitable for use where the temperature is below -60 or more than 450 degrees Fahrenheit.
2. It is also not suitable for use in a flow system, where the flow pressure is more than 300psi.
3. Diaphragm valves are not ideal for use in multi-turn operations

Application of Diaphragm Valves

Diaphragm valves are used in different industries because they are cheap, very effective, and made in different sizes and forms. Below are some common places where the diaphragm valve is of importance:
1. Power industry
2. Vacuum services
3. Breweries
4. Corrosive applications
5. Water treatment facilities, and
6. Pharmaceutical manufacturing systems

What Are Butterfly Valves?

A butterfly valve controls fluid flow using a rotating circular plate or two hinged semicircular plates attached to a transverse spindle and mounted on a pipe to prevent or control flow. Butterfly valves are used mainly in places with limited space. They are very easy to operate and they open fast, with just a 90-degree rotation of the handle that will cause the valve’s complete opening or closure.

Advantages of Using Butterfly Valves

1. They are relatively light in weight
2. Butterfly valves work well in small spaces since they have a compact design
3. Have low-pressure drop and high-pressure recovery
4. They are used to provide bubble-tight service

Disadvantages of the Butterfly Valve

1. The butterfly valve leaves residual materials in the pipeline.
2. The flow turbulence affects the movement of the disc.
3. Sometimes, the thickness of the valve may restrict the fluid flow.
4. Thick liquids can sometimes prevent the disc from moving freely.

Application of Butterfly Valve

Some common applications where the butterfly valve offers effective control includes:
1. Vacuum service
2. Slurry and similar services
3. High pressure and high-temperature water and steam services
4. Compressed air or gas applications
5. Cooling water, air, games, and fire protection.

The most significant difference between the butterfly and diaphragm valves is their valve elements. The diaphragm valve uses a thin, flexible membrane, whereas a butterfly valve uses a circular plate that controls fluid flow by closing and opening.
Are you in search of top-quality valves for your system? Visit Adamant valves to get high-quality sanitary valves, including stainless steel diaphragm valves, butterfly valves, pneumatic valves, and electric valves for different flow systems. Feel free to call us today at (949) 407 8897 to reach our experts and get the perfect valve for your system.

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A sanitary valve for powders is widely used in many industries.

A customer of Adamant Valves has a wide range of products, including organic infant formulas, organic follow-on milk, organic milk, organic cereals, allergenic formulas, milk-free infant formulas, dietetic baby food, probiotics, and polyunsaturated fatty acids.

Butterfly Valve for Powders

The drive for innovation has necessitated the requirements of extraordinary accuracy in production and packaging. The company, from a technological point of view, classifies itself somewhere between a dairy and pharmaceutical products and pays the highest attention to the selection of sanitary components for its process.
Sanitary diverter valves and sanitary butterfly valves play an important role in powder conveying.

How to convey powders for sanitary valves in the materials handling industry?

In a typical wet blending/spray drying process for infant formulas and powders, ingredients are blended with water in large batches and then pumped to a heat exchanger for pasteurization. After pasteurization, the liquid is homogenized and the product may be concentrated by passing it through an evaporator or sent directly to the spray dryer.

the product is then atomized in the spray dryer. As droplets of products are fluidized in the dryer, water is evaporated, and then dry powder drops to the bottom of the spray dryer, where it is discharged with a sanitary butterfly valve to a fluidized bed.

As droplets of products are fluidized in the dryer, water is evaporated and then dry powder deposits drop to the bottom of the spray dryer. There the product is typically dried further and cooled. The outlet air from the spray drying chamber still carries product (fines) which is normally ducted into cyclones and bag filters after the spray dryer. From there the product is discharged with sanitary shutoff valves into the fines return line.

The fines can either be transported by conveying pneumatically to the fluidized bed or back to the top of the spray dryer for agglomeration purposes. The actual conveying path is selected by the sanitary valve. After the fluidized bed, the finished powder passes through a sifter and is then pneumatically conveyed to storage silos or packaging lines, where it is deposited into bags or where it is canned.

Moisture and warm temperatures in the wet blending and spray drying process are conducive to bacterial growth. Therefore wet cleaning is normally applied in this process while dry cleaning is often typical in the process after the fluid bed dryer.

What are the features in the design of Adamant sanitary butterfly valves for powders?

It is designed for the delivery of a split open and closed valve by using the principle of compressed air to realize sealing. The valve is the ultra smaller torque and longer life standard than other normal butterfly valves.

What distinguishes sanitary valve components is the gap-free design, especially in critical areas, such as inlet flanges or side cover gaskets. This is very important when the production plants are cleaned wet, in order to prevent product deposits and also humidity residues in gaps.

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The aim of using a butterfly valve is for isolating or regulating the flow of liquid. The closing technique takes the form similar to a disk. All the operation is similar to that of a ball valve, where a quick shut-off is there to regulate the flow. Usually, people prefer butterfly valves as they are inexpensive as compared to other valves due to their lightweight. A butterfly valve needs less support to function.

Here in butterfly valve sanitary, a circular pipe is attached which controls the flow of material through a circular pipe or tube. Usually, the materials for which a butterfly is used are air, gas, steam, or liquid. It can be also be used for certain dry materials.

Butterfly valves are quick opening valves associated with a metal circular disc along with its pivot axes at right angles. It regulates the direction of the flow of the pipe. It works with the mechanism that when it is rotated on a shaft, it seals against seats in the valve body. The butterfly valves are normally used as throttling valves to control flow. The high-performance butterfly valves do not have any pockets where the fluids may get trapped while the valve is closed.

This type of valve is one of the most compact, as well as lightweight valves, that exist on the earth. It has a wide range of applications. This kind of valve is more popular due to the choice of the seat as well as the lining. Moreover, the disc options have significantly enhanced the demand for the same over the latest years making the valve a smart alternative.

Being full of all the favorable qualities like the wide range of materials with desired sizes and pressure ratings offers reliable and positive isolation with moderate flow control potential more than a wide range of applications all the way through the valve industry.

The petrochemical trade and oil industry use this metal seated valve because they are fire safe, lightweight as well as perfectly suitable for actuation. If used for the appropriate application these butterfly valves offer you a great number of advantages. It is suitable for chemical services. The main advantage of the valve is that it can be used where space is less. It is designed to be used with small dimensions.

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This may sound discouraging to business owners but fortunately, all is not lost. Lots of manufacturers have already managed to develop new sanitary valves which can take on the fermentation of antibiotics with ease. They can also withstand corrosion and resist rust. In short, they offer value for money.

Design

The latest sanitary butterfly valves feature cutting-edge technological concepts meant to curb bacterium and polytetrafluoroethylene liners. This is made possible by the fact that screw threads of butterfly valves do not directly touch the production material. Keep in mind that the valves can withstand high temperatures as well as corrosive liquids. That explains why they are ideal for organic solvents, acids, and alkalis.

Specifications

Working pressure, operating temperature, and diameter are some of the most important specifications one has to take into account when considering sanitary valves. The diameter is usually measured across the valve inlet or outlet port. Working pressure on the other hand is simply the pressure at which the valve is designed to optimally operate. Then there is the operating temperature which happens to be the most important specification.

It is simply the ideal temperature that can allow smooth flow of liquids through the valve without compromising their composition and ultimately quality. Note that these valves can be configured to work with gases, liquids, and liquids with suspended solids. The ideal temperature is therefore one that the valve can easily withstand and still function as it should.

Body Material

This can be either plastic or metal. Metal choices often include copper, cast iron, bronze, ductile iron, steel, and stainless steel. Plastic choices include CPVC and PVC. Common end connections may be threaded or buttweld. Other forms of connections on the common end may include solder end, lugged, flangeless wafer style, grooved end, and mechanical joint. Sanitary valve actuation types include pneumatic, manual and electric.

Choosing the best valve

Sanitary valves are not the same. That being said, you should only select your valves according to the characteristics and composition of the fluids that will pass through them. This explains why valves are made of different materials as already hinted.

Some materials can handle more corrosive and flammable liquids than others. Failure to take this simple consideration into account can easily lead to crystallization or corrosive build-up around the piston. This can in turn lead to unexpected safety problems some of which could be life-threatening.

Care and maintenance

You don’t have to worry much about the performance of your sanitary valve. They call for little maintenance. It should however be noted that regular inspection is mandatory if one is to enjoy the full benefits that come along with the valves.

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So what are the reasons for large diameter sanitary butterfly valve to leak? It has two aspects.

1. Butterfly valve itself quality problems

In the analysis of large-diameter butterfly valve problems, we have to mention the quality of the valve itself. In particular, some small manufacturers of valves are prone to such a phenomenon. Gates off the coating or anti-corrosion coating is thin, can cause the gate rust as well. This led to rust block dregs damage caused by the closure of the tape on the valve lax. If there are quality defects in the sealant, it will cause poor installation, causing the sealing ring brake.

2. Butterfly valve operation in the hydraulic reasons

Generally, large-diameter pipe network pressure is 30 meters above the butterfly valve in the opening and closing process to withstand greater pressure. The sudden movement of the water flow changes the state, and the butterfly valve from the closed state gradually opens to form a gap.

The shear force generated by the flow acts on the gate, cutting the edge of the gate. Multiple effects may make the rubber ring off or break, causing the valve to lose.

Conclusion

Thank you for reading our article and we hope it can help you better understand the large diameter sanitary butterfly valve leakage reasons. If you want to learn more about the large diameter sanitary butterfly valve leakage reasons, we would like to advise you to visit Adamant Valve homepage for more information.

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1. Butterfly valve can be installed anywhere in the pipelines in the space.

2. The installation location of the sanitary butterfly valve should ensure the convenience of use, maintenance, and replacement.

3. There’s no need to take into consideration the flow direction of the pipeline medium when installing the butterfly valve. That is to say, two-way flow is allowed.

4. Before installation, the butterfly valve should be stored in an indoor dry place and the valve plate should open at 4 to 5 degrees.

5. The following work should be carried out before installing the butterfly valve:
(1) Carefully check to see whether the use of the butterfly valve is consistent with its specifications.
(2) Clean the cavity and sealing surface. Do not allow dirty substances to be attached to it. Do not open or close the butterfly plate before cleaning.
(3) Check to see whether the driving device has a reliable connection with the flange on the butterfly valve.

6. When the pipeline clamps, notice whether the connecting force is uniform and reliable.

7. After installation, when the pipeline strength pressure test is underway, the valve plate must be in the position of “open”.

8. After installation, the butterfly valve should be periodically checked. the main items of the inspection are as follows:
(1) Whether the valve seat and O-shaped sealing ring are damaged.
(2) The sealing performance of the sealing surface.
(3) After maintenance and assembly, no jamming is allowed to occur when opening or closing, or rotating.
(4) After maintenance and assembly, a sealing performance test should be carried out.
(5) After each maintenance, document the situation for future reference.

Conclusion

Thank you for reading our article and we hope it can help you better understand the precautions to take when using a signal butterfly valve. If you want to learn more about precautions to take when using a signal butterfly valve, we would like to advise you to visit Adamant Valve homepage for more information.

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Automatic, manual, or sanitary butterfly valves are widely used in many fields such as beer, beverage, dairy, fruit juice, pharmacy, and biological engineering. There are many valves that are vulnerable to high temperature and pressure. It should be noted that high temperature and high pressure can also directly affect the extension of ventilation butterfly valve life, as is often said, the higher the medium temperature, the shorter the sanitary valve life. So we’re going to add a cooling device at high pressure, which obviously increases the life of the butterfly valve.

Why do sanitary butterfly valves need to be annealed?

In the production process of ferritic stainless steel sanitary butterfly valves, in order to meet the requirements of the final cold rolling, a key and costly process is annealing after hot rolling. The traditional process route is that the hot-rolled strip is annealed in the covered furnace. The whole annealing cycle is long and the energy consumption is very high.

In order to reduce energy consumption and production cost, and improve product competitiveness, as well as to meet the final cold rolling on the sanitary butterfly valve requirements, an invention has low energy consumption, short time consumption, cost competitiveness and can fully meet the requirements of the sanitary butterfly valve of the final cold rolling has been invented, which is called direct annealing process. The basic principle of this process is to use the waste heat after hot rolling to treat it immediately.

How to improve the quality of sanitary butterfly valves?

The choice of material is very important to the normal and reliable work of the butterfly valve. Compared with globe and gate valves, sanitary butterfly valves avoid deformation caused by irregular shape, uneven shell wall thickness, cold contraction at low temperature, and differential stress; as the volume of the sanitary butterfly valve is small, the shape of the valve body basically weighs, so the heat capacity is small and cooling consumption is also small. The shape rule also facilitates cooling measures for regulating valves. A series of measures should be taken to prevent the above phenomenon when developing a low temperature regulating valve.

According to the user’s report, some low temperature regulating valves during operation, the rotating part of the butterfly valve is stuck, and occlusion phenomenon occurs from time to time. The main reasons are an unreasonable selection of matched materials, too small cold clearance, and machining accuracy. For example, SF-1 composite bearings with a small friction coefficient and self-lubricating properties are selected for the upper and lower bush of the stem, which can be applied to some special needs of the low-temperature butterfly valve.

Conclusion

The butterfly is mounted on a rod and when the valve is closed it blocks the passage of fluid. 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.

Thank you for reading our article and we hope it can help you better understand the service life of sanitary butterfly valves. If you want to learn more about sanitary butterfly valves, we would like to advise you to visit Adamant Valve homepage for more information.

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Usually, in throttling, regulation control, and mud medium, it’s required that the structural length is short, opening and closing speed is quick. It’s recommended to use a sanitary butterfly valve under low-pressure shut-off occasions.

In situations such as two-position regulation, necking channel, low noise, cavitation and gasification, a small amount of leakage to the atmosphere, abrasive media, butterfly valve can be used. Throttling under special working conditions, or strict requirement for sealing, or using butterfly valves under severely abrasive and low-temperature working conditions, three eccentric or double eccentric special butterfly valve that has special-designed metal sealing with regulating device needs to be used.

The centerline butterfly valve is suitable for fresh water, sewage, seawater, brine, steam, natural gas, food, medicine, oil, and other pipelines that require complete sealing, zero leakage from the gas test, higher life expectancy, and a working temperature between -10~150°C.

The soft sealing eccentric butterfly valve is suitable for two-way opening and closing and regulation of ventilation and dust-removal pipelines and is widely used in gas pipelines and waterways of metallurgy, light industry, electricity, petrochemical system.

The metal-to-metal linear sealing double eccentric butterfly valve is suitable for pipelines of urban heating, gas supply, water supply, gas, oil as regulating, and throttling devices. In addition to being used as the control valve of large pressure swing adsorption (PSA) gas separation device, metal-to-metal surface sealing three eccentric butterfly valves can also be widely used in petroleum, petrochemical, chemical, metallurgy, electric power, and other fields. It is a good replacement for the gate valve and shut-off valve.

Conclusion

Thank you for reading our article and we hope it can help you better understand the selection of the size and type of butterfly valve. If you want to learn more about the selection of the size and type of butterfly valve, we would like to advise you to visit Adamant Valve homepage for more information.

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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 does a butterfly valve work?

The opening and closing member of a sanitary butterfly valve is a disc-shaped butterfly plate, which rotates around its own axis in the sanitary valve body to achieve the purpose of opening, closing, and regulating. Full opening to the full closure of a butterfly valve is usually less than 900. The butterfly valve and butterfly rod themselves don’t have self-locking capabilities. In order to position the butterfly plate, a worm-wheel reducer needs to be installed on the valve rod. Using a worm-wheel reducer not only makes the butterfly plate have self-locking capabilities, which make the butterfly plate stop at many positions, but also improves the operating performance of valves.

The advantages of butterfly valves:

1. Convenient, fast, effortless opening and closing; small fluid resistance; frequent operation.
2. Simple structure, small size, lightweight.
3. Being able to transport mud; smallest accumulation of liquid at the opening of the pipeline.
4. Good sealing under low pressure.
5. Good regulating performance.

The disadvantages of butterfly valves:

1. Small range of working pressure and temperature.
2. Poor sealing.

The installation and maintenance of the butterfly valves:

1. During installation, the valve flap must stay at the closed position.
2. The opening position should be decided according to the rotating angle of the butterfly plate.
3. For those butterfly valves with bypass valves, bypass valves need to be opened before opening the butterfly valves.
4. Installation should be performed according to the manufacturer’s installation manuals. There needs to be a solid foundation for heavy butterfly valves.

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