How to Care For Intake And Exhaust Valves in Your Car?

 

 

Engine valves are small, but they play a huge role in keeping your car running smoothly. If there is an issue with the valves, such as bent or burnt valves, it must be addressed immediately to prevent engine damage.

What are the symptoms of a bad exhaust valve or bad intake valve? How much will it cost to repair bent or burnt valves? Keep reading to learn the answers to these questions and more.

 

What are intake and exhaust valves?

Intake and exhaust valves are the final component in the valve train system. They are made of hardened metal that must withstand the extreme conditions of the combustion chamber.

Intake and exhaust valves are responsible for controlling the flow of gases through the combustion chamber. Intake valves let air in, whereas exhaust valves let air out.

They are shaped to have a slim stem leading to a flatter face, with the intake valves often being larger than the exhaust. Each valve is designed to only move up and down, not side to side.

When a valve is closed, it sits tightly on the valve seat to stop the flow of air. But when it is open, it separates from the valve seat to allow air to flow through.

In many modern engines, each cylinder has two intake and two exhaust valves per cylinder.

 

Why are intake and exhaust valves important?

There are four events that must take place in an internal combustion engine to ensure operation. These are called strokes.

• The first stroke is the intake stroke. During the intake stroke, an air/fuel mixture is drawn into the combustion chamber by opening of the intake valves (with direct injection engines, the fuel is injected after the air has been drawn in).

• The next stroke is the compression stroke. Both the intake and exhaust valves close, trapping the air/fuel mixture in the combustion chamber. The piston is now forced upward compressing the air/fuel mixture causing it to become highly combustible.

• The next stroke is the power stroke. The compressed air/fuel mixture is ignited by a spark plug. With the exhaust and intake valves remaining closed, the ignited mixture rapidly expands, forcing the piston back downward in the cylinder. This in turn spins the crankshaft, which then through the power train eventually turns the wheels of the vehicle.

• The final stroke is the exhaust stroke. During the exhaust stroke, the piston will begin to head upward again, pushing the expended mixture through the now open exhaust valve. After the exhaust gases have escaped the cylinder, the exhaust valve will close and the intake stroke will occur again.

This entire cycle occurs about 1,250 times per minute when driving at freeway speeds!

 

What can go wrong with intake and exhaust valves?

Although valves can fail for a number of reasons, the two most common types of failures are burnt valves and bent valves .

Burnt Valve

What causes a burnt valve?

Exhaust valves are more likely to burn than intake valves because they typically run hotter by about 450 degrees Fahrenheit.

What causes exhaust valves to burn? One of the most common burnt valve causes is an ineffective seal between the valve and valve seat. Burnt valves occur when the valve can no longer seal correctly after excessive temperatures have damaged the material of the valve.

When this happens, combustion gases are able to escape. These gases will start to burn the edges of the valve as they are forced through it. If the issue is left unaddressed, combustion gases will continue to burn the valve, causing further damage.

The typical causes of burnt valves are allowing the vehicle to overheat or incorrect fuel being used.

Bent Valve

What causes a bent valve?

Bent valves occur when the piston makes contact with the valves. This causes the valve to be no longer able to seal the cylinder correctly.

Many engines are interference engines, meaning the piston travels upward beyond the lowest point that the valves travel downward during normal operation. The engine is timed by a timing belt or chain via the crankshaft, which drives the pistons, and the camshaft, which drives the valves.

Impact between the two is caused when this timing is disrupted by a form of timing failure. For example, if the timing belt snaps or jumps, the piston could make contact with the valve, which could cause a bent valve.

 

What are the signs of bent or burnt valves?

Every car owner should know how to spot the signs of bent or burnt valves. Some of the many signs of a bad intake valve or exhaust valve include:

Engine noise

You may also hear a tapping or ticking noise in the engine if your car has a bad intake valve or exhaust valve. The noise may get louder and faster when the vehicle is accelerating.

Poor engine performance

The engine will not have the right amount of compression to operate normally if there is an issue with the intake or exhaust valves. This is why one of the main symptoms of damaged valves is a rough engine operation, especially at idle. The engine will not be as powerful if a valve is damaged, so if your car starts to lose power, this is a sign of a valve problem.

Engine misfire

Bent or burnt valves can also cause your engine to misfire. This means the engine may jerk, stall, or hesitate when your car is in motion. Your vehicle's fuel consumption could also increase if it is misfiring due to a bad valve.

Check engine light

The check engine light can turn on for a number of reasons, including damaged intake and exhaust valves. If your check engine light turns on, this doesn't always mean that the valves are damaged, but it could. You will need to get a mechanic to inspect your vehicle and diagnose the issue.

 

These are some of the many symptoms of a bad exhaust valve or intake valve. If you spot any of these signs, contact a professional mechanic as soon as possible.

 

Can you drive a car with a bad intake valve or exhaust valve?

The intake and exhaust valves are important parts of your car's engine. If you suspect a problem with an intake or exhaust valve, you should not drive your vehicle until the issue has been addressed by a mechanic.

Bent or burnt valves could seriously damage your engine if they are not repaired right away. To prevent this damage, it's important to avoid driving your vehicle until the valves have been repaired.

 

What needs to be done when damaged valves are suspected?

The first step of diagnosis when damaged valves are suspected would be a leak down test. During this test, the engine is rotated until top dead center of the currently tested cylinder is achieved. The intake and exhaust valves will be closed at this time.

Compressed air is injected into the cylinder through the spark plug hole. The ability of the cylinder to hold pressure is then measured using a leak down gauge. If significant leakage is detected coming from either the car's throttle body or exhaust, the valves are leaking.

In some cases, the valves can to be inspected using a borescope inserted into the cylinder. Removal of the valve cover to inspect the valve train may also be required. If all else fails, the cylinder head may need to be removed to check the valves.

Your mechanic will know what to do to diagnose and repair the issue. All you will need to do is tell them what issues you are experiencing with the car. Then, they can complete a thorough inspection, diagnose the problem, and make all necessary repairs.

 

How much does it cost to repair bent or burnt valves?

Unfortunately, repairing bent or burnt valves is not easy. Valve replacement is a very large job requiring engine tear down. Because this is such a difficult task, the cost for valve repairs can reach above $5,000 in labor alone. This repair can take 35+ hours to complete, after diagnosis.

This estimate does not include the cost of parts, which will increase the total cost of repairs even further.

Sometimes, the valves may simply need to be adjusted rather than replaced. This involves adjusting the space between the valve and the camshaft to keep your engine running smoothly. Engine valve adjustments are much more affordable than engine valve replacements. The price can vary, but adjusting your engine valves will typically cost a few hundred dollars.

 

Note:

Because the engine is broken down during this repair, many gaskets will be replaced and many other parts will often be removed. If you are having this repair done, it may be a good time to have other needed repairs completed as overlapping labor discounts would likely be applied.

We are an exhaust valves supplier. Please feel free to contact us if you need them!

The Ultimate Guide to Check Valves

 

 

Check valves are responsible for ensuring proper flow within a fluid system. Also known as non-return or one-way valves, check valves are specifically designed to prevent reverse flow within a pipeline.

How Does a Check Valve Work?

To really understand the question: how does a check valve work, you must first understand how they’re constructed. Most check valves are made with a body, seat, disc, and cover. Other types of check valves may come with additional parts like a spring, ball, stem, or hinge pin depending on their design.

Check valves are controlled based on a system’s flow velocity. Once the system reaches the cracking pressure or the minimum upstream pressure needed for the valve to operate, the disc will lift and allow the fluid to pass through. If the fluid pressure decreases or if the flow direction starts to reverse, the disc will automatically close the valve to keep fluid from flowing through. This helps to prevent backflow.

Since check valves rely on the pressure and flow velocity of the fluid in the system to operate, they can usually work without any automation or human interaction. With that said, check valves aren’t typically designed with any form of exterior operation mechanisms like a lever or handle.

 

Check Valve Applications

Now that you understand the basics of; how does a check valve work, we review the common applications. Check valves are commonly used for industrial pumps and fluid systems in the oil and gas industry. Chemical and power plants also use check valves to prevent reverse flow in advanced machinery. On top of that, check valves can be installed in many process systems to keep fluids of different pressures separated.

 

Check Valve Selection

While all check valves are designed to ensure proper flow direction, they’re not all the same. There are many types of check valves, and each is intended for specific application and service conditions.

The ideal check valve should be made with a material that’s compatible with the type of liquid or gas you’re working with. You should also make sure that you select the appropriate type of check valve (e.g. spring-assisted in-line check valve, silent check valve) for the application.

 

3 Common Problems in Check Valve Selection

Water Hammer

Water hammer is one of the most common check valve problems. A water hammer is a pressure surge that’s caused when a liquid or gas is forced to stop or change direction suddenly and often occurs when a valve is suddenly closed at the end of a pipeline system. This can result in both noise and vibration, which can, in turn, lead to damage and additional maintenance or repair costs.

Water hammer can be prevented, however, by using a faster-closing check valve that stops the pressure surges and shock waves that can damage and rupture equipment. Our silent check valves in particular are known for their effectiveness in preventing and in many cases eliminating water hammers.

Reverse Flow

Reverse flow is another common check valve problem and can be extremely costly, especially when it occurs at the discharge of a pump, causing the pump to spin backward.

A fast-closing and tight shut-off valve are necessary to prevent this problem, and the right spring-assisted in-line check valve will do just that, eliminating reverse flow.

Oversizing

If there is a lot of valve chatter—opening and closing of the valve repeatedly—chances are it’s due to oversizing. What’s important to remember is that check valves should be sized for the application, and not for the line size. You want the disc to be stable against the internal stop in the open position or fully closed; this will result in no repeated fluttering, and therefore no premature failure.

Keep these common problems in mind, select the right check valve for your application, and your check valves will last longer and work more effectively for your applications.

 

Takeaways

Most importantly, you need to ensure that the check valve you choose is the correct size for the application, not the line size. Selecting a valve that’s sized for the application keeps the disc stable on the internal stop when the valve is open or closed. This helps to keeps the disc from fluttering and extends the valve’s overall service life.

We are a check valve supplier, please feel free to contact us if you need them!

10 Factors to Consider When Choosing Butterfly Valves

 

A butterfly quarter is a quarter-turn valve, allowing for a quick shut off making it cost-efficient. The “butterfly” is a metal disc positioned in the center of the pipe with a rod passing through the disc to an actuator on the outside of the valve. It is in the shape of a gear, which is usually referred to as a gearbox, while the handwheel is connected to the stem. Rotating the actuator turns the disc either parallel or perpendicular to the flow.  The valve is fully opened or closed when the disc is rotated a quarter turn, to stop, regulate, or start the flow. They are suited for handling large flows of liquid and gas at low pressures.

Read on for more information on how to choose a butterfly valve.

 

Pressure Drop

Energy costs go up with excessive pressure drop. The valve or valves are but one factor in a piping system that contributes to pressure drop. Of equal concern are these factors:

 

• The flow area of piping.

• Friction loss against pipe walls.

• Change of flow direction via fittings

• Butterfly valves have flow characteristics three times better than globe valves and approximately 75% of an equivalent size gate valve.

 

Operating Life

Butterfly valves can provide many maintenance-free cycles and still accommodate "bubble tight" shut-off.

 

Weight

Installation dollars saved with lightweight butterfly valves as compared to heavyweight cast iron valves; i.e. a 10" butterfly may weight 55 pounds, whereas a 10" iron gate may weigh 490 pounds. This can be an important saving when it is calculated over an entire system. The heavier the system, the stronger the pipe hangers, and the more expensive they become. So, by considering the weight of a valve one can also reduce piping system costs.

 

Versatility

Butterfly valves can be used for on/off service and throttling/balancing. They are superior in "versatility" as compared to a gate or globe valve. Butterfly valves have a wider range of chemical resistance due to the trim options and choice of elastomeric liners.

 

Bubble Tight Shut-Off

Gate and globe (metal to metal) seats cannot provide bubble-tight shut-off. Resilient seated butterfly valves are bubble-tight by design.

 

Physical Size

Butterfly valves take up approximately 1/6 the space of a gate valve. Every cubic foot of a building costs money.

I.E.: 10" butterfly is about 21" high and a 10" iron gate is about 43" high.

 

Cost

A butterfly valve is generally 40% the cost of an iron gate valve, not only in low initial costs but in low installation costs as well.

 

Maintenance

Properly installed butterfly valves are virtually self cleaning and are less susceptible to failure due to trash material in the line.

 

Ease of Operation

Butterfly valves offer 1/4" turn (90 degrees) open to close. Gates and globes require multiple turns to open and close. Ease of opening or closing means that butterfly valves can employ less expensive operators.

 

For more information on Yuanda Valves, visit our website.

What is the Difference Between a Knife Gate Valve and a Gate Valve?

 

While knife gate valves and gate valves share many similarities – they’re both used in on-off applications, involving slurries and other viscous media – there are some noteworthy design variances to consider when weighing up which type of valve would be best suited for your application. While gate valves and knife gate valves share many similar characteristics, there are some fundamental differences that set them apart.

 

HOW DO KNIFE GATE VALVES WORK?

Knife gate valves perform exactly as the name implies. These types of valves were originally designed for the pulp and paper industry. Stringy pulp would impinge between the wedge and seat of a normal gate valve and prevent flow shut-off. Knife gate valves were designed with a sharp edge to cut through the pulp and seal. With this type of useful attribute, the knife gate valve has become invaluable in applications involving slurry, viscous fluids, and other systems where impingement is an issue.

 

HOW DO GATE VALVES WORK?

Gate valves open by lifting a round or rectangular gate (or wedge) out of the path of the fluid. The sealing surfaces between the gate and seats are planar, so gate valves are often used when a straight-line flow of fluid and minimum restriction is needed. They have a flat gate closure that slides in and out or up and down between two parallel plates to open or close the valve. Gate valves are used for shut-off, rather than flow regulation because they only have two settings: on and off.

 

KNIFE GATE VALVE APPLICATIONS

Knife gate valves are advantageous in sludge and slurry applications because their blades cut right through thick liquids easily. They’re generally specified in larger sizes for handling thick flows of heavy oils, light grease, slurry, paper pulp, varnish, and wastewater to name but a few knife gate valve applications.

 

GATE VALVE APPLICATIONS

Gate valves are used in many industrial applications requiring shut-off valves, including the oil and gas industry, pharmaceuticals, manufacturing, and automotive. They can cope in demanding environments, such as high temperature and high-pressure environments. Common gate valve applications include power plants, water treatments, mining, and offshore applications.

 

PROS AND CONS OF GATE AND KNIFE GATE VALVES

The advantages of knife gate valves are that they’re cheap, easy to actuate, and light. One of the most notable disadvantages of knife gate valves is that they’re known to have low-pressure limitations. This makes them less desirable for use in applications that require cleanliness or sanitary conditions.

One of the advantages of gate valves is that pressure drop across a gate valve is very low when it is fully open. They can also be used for bi-directional action and are useful as on-off valves. Gate valves do, however, need a large force to operate and large-sized valves need automatic actuators. They’re not quick to open or close, and take up more space when compared to some other valves. Thermal expansion and shrinking can also lead to unwanted leakage in some gate valves that are exposed to high-temperature fluctuations.

 

THE BEST GATE AND KNIFE GATE VALVES MANUFACTURER

Founded in 1994, Yuanda Valve Group Co., LTD. has made use of the short 30 years to rise and expand at a speed of 100 times. We are advancing with time, updating equipment, elaborately carving out our brand, focusing on developing high-end valve products, and actively responding to market demands with creativity. If you are interested in our products, please visit our website for more information!

What are the Features of Gate Valves?

 

The gate valve is one of the most commonly used cut-off valves, used to cut off or connect the medium in the pipeline. The shrinkage of the diameter can reduce the size of the parts, reduce the force required for opening and closing, and expand the application range of the parts. But after the diameter shrinks, the fluid resistance loss increases.

The gate valves have the characteristics: Low fluid resistance Applicable pressure and temperature range, etc. It is one of the most commonly used cut-off valves, used to cut off or connect the medium in the pipeline.

Domestic and abroad low-pressure gate valves generally use cast iron materials. Cast iron gate valves often have serious problems such as freezing and cracking of the valve body and falling off of the gate. The carbon steel stem of the cast-iron gate valve is easy to rust, the quality of the packing gasket is poor, and the internal and external leakage is serious.

Diameter shrinkage can reduce the size of parts, reduce the force required for opening and closing, and expand the application range of parts. But after the diameter shrinks, the fluid resistance loss increases.

 

So more features of gate valves

1. Overall rubber encapsulation: The gate adopts high-quality rubber for the overall inner and outer rubber. European first-class rubber vulcanization technology enables the vulcanized gate to ensure accurate geometric dimensions, and the rubber and ductile cast gate can be firmly connected, which is not easy Good shedding and elastic memory.

2. Lightweight: The body is made of high-grade nodular black cast iron, and the weight is about 20%~30% lighter than the traditional gate valve. It is easy to install and maintain.

3. Precision casting valve body: The valve body adopts precision casting, and the precise geometric dimensions make the inside of the valve body without any fine processing to ensure the sealing of the valve.

4. Flat-bottomed gate seat: The traditional gate valve often deposits in the groove at the bottom of the valve due to foreign objects such as stones, wood, cement, iron filings, sundries, etc. after the pipe is washed with water, which can easily cause water leakage.

The bottom of the elastic seat-sealed gate valve adopts the same flat-bottom design as the water pipe machine, which is not easy to cause debris siltation and makes the fluid flow unimpeded.

5. The opening and closing torque are small, and the opening and closing are more labor-saving. Because the direction of the gate movement is perpendicular to the direction of the medium flow when the gate valve is opened and closed, the opening and closing of the gate valve is more labor-saving

6. Small fluid resistance: because the internal medium channel of the gate valve body is straight, the medium does not change its flow direction when flowing through the gate valve, so the fluid resistance is small.

 

We are a gate valves supplier, please feel free to contact us if you need them!

Ball Valve Types Based on Valve Housing

 

The difference between ball valve types is how the pieces of the valve are assembled and this affects the ways for maintenance or repair. The operation of the valves is the same in each housing type. The assembly of the valve housing can be divided into a few commonly used designs detailed out below.

 

Top Entry Ball Valve

Top Entry Ball Valves are valves that assembled their ball from the top side part. A top entry body allows access to the ball and seats for maintenance without the need to remove the valve and is preferred for larger sizes. It is not required to be removed the valve from the pipe system. Usually, top entry ball valves are made from casting metal. Since it is made from casting it will need some additional NDE tests to make sure that there is no defect from the casting process. The advantage of the top entry ball valves is their construction that allows minimal thread connection so that it will also minimize possible leak paths.

 

Side Entry Ball Valves

Side Entry Ball Valves are valves that assembled their ball from the side part. It is usually assembled in two pieces or three pieces of body. Each part of the body is assembled by a bolt stud just like joining a two-piece of flanges. Usually, side entry ball valves are made from forge metal. Each piece of the body is forged and then assembled together. This construction will minimize a defect caused by a casting valve. Side entry ball valves are also easy to assemble and the trim component is also easy to align. Another advantage of the side entry type is its fast delivery time from almost all vendors rather than a casting product that still needs some additional test.

 

Welded Body Ball Valves

Welded Body Ball Valves are valves that are assembled in completely welded construction so that there are no leak paths through-bolt connection etc. It’s not possible to do maintenance for the valve in the field. These welded body ball valves are usually used at underground or buried applications where maintenance is not expected such as gas transmission, subsea application, etc.

All welding processes for the body have to be suited to the materials of construction and are to be qualified and performed according to relevant standards. Non-destructive tests (NDTS) are also to be performed on the circumferential weld joints of the body

 

One Piece or Single Body Ball Valve

One Piece Ball Valves or Single Body Ball Valves have a solid, cast body which reduces the risk for leakage. These are the cheapest variant of ball valves. These valves can not be opened for cleaning or maintenance. These valves are generally used for low demanding applications. One-piece ball valves are almost always reduced bore, are relatively inexpensive, and generally are throw-away.

 

Two-Piece Ball Valve

Two-Piece Ball Valves consists of two pieces, one piece that has one end connection and the body and the second piece that fits into the first, holds the trim in place, and includes the second end connection. These can be disassembled for cleaning, servicing, and inspection. The valve must be completely removed from the pipe in order to separate the two parts. Two-piece ball valves are generally slightly reduced (or standard) bore and they can be either throw-away or repairable.

 

Three Piece Body Ball Valve

Three Piece Ball Valve consists of three pieces two end caps and a body. All three pieces are generally clamped together by bolt connections. The three-piece design allows for the center part of the valve containing the ball, stem & seats to be easily removed from the pipeline. This facilitates efficient cleaning of deposited sediments, replacement of seats and gland packing, polishing out of small scratches on the ball, all this without removing the pipes from the valve body. The advantage of this embodiment is that the valve can be serviced without removing the entire valve from the pipeline. These valves are usually the most expensive compared to other types.

The Best Ball Valve Manufacturer

Founded in 1994, Yuanda Valve Group Co., LTD. Has made use of the short 30 years to rise and expand at a speed of 100 times. We are advancing with time, updating equipment, elaborately carving out our brand, focusing on developing high-end valve products, and actively responding to market demands with creativity. If you are interested in our products, please visit our website for more information!

Ball Valve Types Based on Valve Housing

 

The difference between ball valve types is how the pieces of the valve are assembled and this affects the ways for maintenance or repair. The operation of the valves is the same in each housing type. The assembly of the valve housing can be divided into a few commonly used designs detailed out below.

 

Top Entry Ball Valve

Top Entry Ball Valves are valves that assembled their ball from the top side part. A top entry body allows access to the ball and seats for maintenance without the need to remove the valve and is preferred for larger sizes. It is not required to be removed the valve from the pipe system. Usually, top entry ball valves are made from casting metal. Since it is made from casting it will need some additional NDE tests to make sure that there is no defect from the casting process. The advantage of the top entry ball valves is their construction that allows minimal thread connection so that it will also minimize possible leak paths.

 

Side Entry Ball Valves

Side Entry Ball Valves are valves that assembled their ball from the side part. It is usually assembled in two pieces or three pieces of body. Each part of the body is assembled by a bolt stud just like joining a two-piece of flanges. Usually, side entry ball valves are made from forge metal. Each piece of the body is forged and then assembled together. This construction will minimize a defect caused by a casting valve. Side entry ball valves are also easy to assemble and the trim component is also easy to align. Another advantage of the side entry type is its fast delivery time from almost all vendors rather than a casting product that still needs some additional test.

 

Welded Body Ball Valves

Welded Body Ball Valves are valves that are assembled in completely welded construction so that there are no leak paths through-bolt connection etc. It’s not possible to do maintenance for the valve in the field. These welded body ball valves are usually used at underground or buried applications where maintenance is not expected such as gas transmission, subsea application, etc.

All welding processes for the body have to be suited to the materials of construction and are to be qualified and performed according to relevant standards. Non-destructive tests (NDTS) are also to be performed on the circumferential weld joints of the body

 

One Piece or Single Body Ball Valve

One Piece Ball Valves or Single Body Ball Valves have a solid, cast body which reduces the risk for leakage. These are the cheapest variant of ball valves. These valves can not be opened for cleaning or maintenance. These valves are generally used for low demanding applications. One-piece ball valves are almost always reduced bore, are relatively inexpensive, and generally are throw-away.

 

Two-Piece Ball Valve

Two-Piece Ball Valves consists of two pieces, one piece that has one end connection and the body and the second piece that fits into the first, holds the trim in place, and includes the second end connection. These can be disassembled for cleaning, servicing, and inspection. The valve must be completely removed from the pipe in order to separate the two parts. Two-piece ball valves are generally slightly reduced (or standard) bore and they can be either throw-away or repairable.

 

Three Piece Body Ball Valve

Three Piece Ball Valve consists of three pieces two end caps and a body. All three pieces are generally clamped together by bolt connections. The three-piece design allows for the center part of the valve containing the ball, stem & seats to be easily removed from the pipeline. This facilitates efficient cleaning of deposited sediments, replacement of seats and gland packing, polishing out of small scratches on the ball, all this without removing the pipes from the valve body. The advantage of this embodiment is that the valve can be serviced without removing the entire valve from the pipeline. These valves are usually the most expensive compared to other types.

The Best Ball Valve Manufacturer

Founded in 1994, Yuanda Valve Group Co., LTD. Has made use of the short 30 years to rise and expand at a speed of 100 times. We are advancing with time, updating equipment, elaborately carving out our brand, focusing on developing high-end valve products, and actively responding to market demands with creativity. If you are interested in our products, please visit our website for more information!

The Evolution Of Butterfly Valves

 

The prototype of a butterfly valve

The original butterfly valve was a simple, poorly closed flap valve. It is usually used as a flow regulator and damper valve in water piping systems. With the application of chemically resistant synthetic rubber on the butterfly valve, the performance of the butterfly valve has been improved. Synthetic rubber has the characteristics of corrosion resistance, erosion resistance, dimensional stability, good resilience, ease to form, low cost, etc., and can be selected according to different requirements for the use of different properties of synthetic rubber to meet the working conditions of the butterfly valve. Therefore, it is widely used to manufacture the lining and resilient seat of a butterfly valve.

 

The development of butterfly valve

 

PTFE

Polytetrafluoroethylene (PTFE) has strong corrosion resistance, stable performance, not easy to aging, low coefficient of friction, easy to shape, dimensional stability, and other characteristics. And it can also be filled and added with appropriate materials to improve its comprehensive performance, to get better strength, the lower friction coefficient of the butterfly valve sealing material, to overcome some of the limitations of synthetic rubber. Therefore, the polymeric materials represented by PTFE and its filler-modified materials are widely used in butterfly valves. Thus, the performance of butterfly valves has been further improved. There are butterfly valves with a wider temperature and pressure range, sealing performance, and longer service life.

 

Metal Sealed Butterfly Valves

To meet the use requirements of industrial applications such as high and low temperature, strong erosion, and long life, metal sealed butterfly valves have been developed greatly in the last decade or so. With the application of high-temperature resistance, low-temperature resistance, strong corrosion-resistance, strong erosion resistance, and high strength alloy materials in butterfly valves, metal sealed butterfly valves have been widely used in industrial fields such as high and low temperature, strong erosion, and long life. The butterfly valve with a large diameter (9750mm), high pressure (2.2kN/cm2), and wide temperature range (-102～606℃) has emerged, thus bringing the technology of the butterfly valve to a whole new level.

 

CAD&CAM

Due to the application of computer-aided design (CAD) and computer-aided manufacturing (CAM) and flexible manufacturing system (FMS) in the valve industry, the design and manufacture of butterfly valves have reached a whole new level. The comprehensive innovation of the valve design calculation method reduces the heavy and repetitive routine design work of professional and technical personnel. So that technical personnel has more energy to improve the technical performance of the product and the research and development of new products. Shorten the cycle, improve labor productivity. Especially in the field of metal sealed butterfly valves, due to the application of CAD/CAM, there is a three-dimensional seal designed by CAD and manufactured by cAM CNC machining. It makes the sealing surface of the valve free from any extrusion, abrasion, and wears during the opening and closing process, thus increasing the sealing and service life of the butterfly valve by orders of magnitude.

 

We are a butterfly valve supplier, please feel free to contact us if you need them.