Butterfly Valves for Sale
What is a butterfly valve? A butterfly valve is basically a quarter-turn rotational motion valve used to isolate or regulate a liquid’s flow. The closing mechanism used in it is a disc that rotates. In addition to standard butterfly valves, DBV butterfly valve manufacturer also offers custom orders and custom assemblies for unique applications.
- Min Order Quantity: 1 PCS. (Buy More Save More)
- Custom Options: valve dimension, pressure, connection type, operation type, material, company logo, packaging, etc.
- Custom Material: Aluminum, Copper, Bronze, Silicone Bronze, Brass, Grey Iron, Ductile Iron, Carbon Steel, 3% Nickel Iron, Nickel-Plated Ductile Iron, 400 Series Stainless Steel, 316 Stainless Steel, 17-4 PH Stainless Steel, Alloy 20Cb-3, Monel, Stellite, Hastelloy C, etc.
- Available butterfly valve types: Wafer-style butterfly valve, Lug-style butterfly valve, Rotary valve, double flanged butterfly valve, triple offset butterfly valve, grooved butterfly valve, etc.
Wholesale Wafer Type Butterfly Valves
Wholesale Lug Type Butterfly Valves
Triple Offset Butterfly Valves
Double Offset Butterfly Valves
Double Flanged Butterfly Valves
Actuated Butterfly Valve
High Performance Butterfly Valves
Know More about Butterfly Valves
Butterfly Valve History
An example of a butterfly valve is the choke in a carburetor. While the concept used in a butterfly valve is a fairly common one, its application in industrial piping actually began in the 1930s. The applications of this valve started from oil field use but eventually spread to other industries.
Eventually, butterfly valves became very common, and a lot of other types emerged. Manufacturers tried to standardize the design, but they did not succeed. There were standardized flanged waterwork valves in the fluid processing industry, rubber-lined lug valves, and wafer valves. But the butterfly valves were the ones that were standardized the least.
Eventually, in 1882, high-performance valves were standardized. If anyone wants an end-to-end unstandardized valve, they are still available, but they may not be for many years.
Butterfly Valve Working Principle
How does a butterfly valve work?
The principle used in the construction of butterfly valves is the pipe damper principle. The flow element rotates on either a horizontal or vertical axis. It is a disc shape, and its diameter is about the same as that of the inside of an adjoining pipe.
The valve opens fully when the flow element is parallel to the piping run. When the disc is at a 90 degrees angle, the valve closes. This happens because the passageway is open in a similar position and allows the passage of fluids.
Handle-locking devices can secure the valves. Butterfly valves work in a manner quite similar to that of ball valves. So why don’t we just use ball valves? Well, for starters, butterfly valves cost much lesser than butterfly valves. Secondly, butterfly valves are lighter in weight. For this reason, they don’t need a lot of support.
There is a rod that passes through the disc (flow element) onto an actuator. This actuator is at the other end of the rod. We can rotate the actuators to turn the disc parallel or perpendicular and restrict or release the flow of fluids. The disc is there during the flow, which causes it to create a pressure drop when open.
Butterfly Valve Construction
Butterfly Valve Seat Construction
A seat is present on the inside periphery of the body of the valve. This seat helps in the stoppage of flow. Some butterfly valves have an elastomeric seat while others have a seal ring arrangement. The elastomeric seat seals against the disc. The seal rings use a clamp-ring and backing ring. These rings are present on a rubber ring with a serrated edge. Extrusion of O-rings is presented with the help of these designs.
Conventional designs used a metallic disc to seal against a seat made of metal. While this arrangement provided good closure in some departments like the water distribution line, it did not provide a leak-tight or leak-free closure. Hence, this design was rejected.
Butterfly Valve Body Construction
There are various designs of the body construction of butterfly valves. The wafer type construction is one that fits between two pipeline flanges. This wafer type of body construction is the most economical design.
Then we also have a lug-wafer butterfly valve body construction. In this case, the body is held between pipe flanges (two) with bolts’ help. The bolts join the flanges and go through holes or openings in the outer casing of the valve. You can get butterfly valves with the conventional flanged ends to bolt to pipe flanges. This occurs in a threaded end construction.
Butterfly Valve Material
1. Butterfly Valve Body Material
The body of a butterfly valve is usually made up of cast iron. The force of the adjacent pipeline usually does not affect the valve body. The lining management theory is capable of protecting the valve body from fluid damages.
Apart from cast iron, manufacturers also use ductile iron and steel to make valve bodies. For extreme external conditions like corrosion, brackish water, or in aquatic environments, aluminium bronze can be used as it can resist these conditions. Sometimes resistant coatings of multi-part epoxy, nickel plating, etc. are used on car body exteriors. This is to protect it against corrosion and encourage cleanliness.
2. Butterfly Valve Disc Material
Materials used to construct the disc of butterfly valves include ductile iron, aluminium bronze, stainless steel, etc. Aluminium bronze is suitable for the water supply. Ductile iron accompanied by electroless metal coating can also be used for water supply discs. If corrosion resistance is not a priority, then stainless steel can also be used. For example, in air service or HVAC pipelines, we don’t need a corrosion-resistant disc, so 300 series or 400 series stainless steel is used for the valve stem.
3. Butterfly Valve Seat Material
For the valve seat, usually, the following materials are used:
- NBR (Buna-N)
- FKM (Viton)
- metal to metal etc.
Butterfly Valve Application Guide
What is a butterfly valve used for? Do you know the uses of butterfly valve?
Butterfly valves find their uses in a lot of areas such as fluid processing in the chemical, food, and pharmaceutical industries. They also act very well when applications are slurry. They are used in the following areas:
- Slurry services
- Fire protection services
- Vacuum services
- High-pressure water and steam services
- High-temperature steam and water services
- Cooling fluids (water, air, gases)
Butterfly Valve Advantages and Disadvantages
Butterfly Valve Advantages
Butterfly valves have many benefits that make them useful in many services.
- They are small in size and compact, so they take up less space.
- They are also available in large sizes if needed.
- They take less time to open or close.
- They are precise enough for industrial uses.
- They are durable and reliable.
- They require less maintenance.
- They provide a low-pressure drop and recovery from high-pressure.
- The disc of the butterfly valve is very light, so it requires less support than that of a ball valve of nearly the same size. Ball valves are heavier, so need more structural support.
Butterfly Valve Disadvantages
- There are two potential concerns: Cavitation and choked flow.
- Butterfly Valve Throttling service is limited to low differential pressure.
- Butterfly Valve disc movement guides and affects by flow turbulence.
Butterfly Valve Installation
Most problems associated with butterfly valves are related to the difficult installation process.
So it is much better to consider the best-practice while laying out the pipework and installing the valve. In a strong and pliable butterfly valve, the seat generally spreads to either side of the valve. Thanks to these seats, no gaskets are required. The seat performs all the functions of a gasket.
The seat in a resilient-seated Butterfly valve usually extends around to both faces of the valve. As a result, no gaskets are required as these seats serve the function of a gasket. The material of the seat extends past the face and is compressed during installation. It flows toward the middle of the seat of the valve. If this configuration is disturbed due to improper installation, then the ratings of pressure will be affected. Also, the seating and unseating torques are likely to be affected.
Butterfly valves are different in that the discs go beyond the face of the valve. The disc opens at angles of approximately 30 degrees or more when it is installed between the flanges. Before installation, it should be ensured that the disc can rotate or turn freely to enter the pipework and flanges.
The following tells you the correct installation steps.
- First, you need to make sure that both the pipeline and flanges faces are clean. This is important because any foreign materials or impurities such as pipe scale, welding rods, or slag can limit the disc and seat mobility.
- You don’t need gaskets if the valve’s seats are resilient—gaskets extent to both the faces/sides of the valve.
- The pipework should be aligned and the flanges spread out enough so that the valve body can easily slide through the flanges without coming into contact with the pipe flanges.
- The valve disc should be set about 10% open so that it doesn’t get stuck when the position is fully seated.
- The valve needs to be inserted between the flanges in a manner that does not damage the seat faces. Take care to not lift the valve by the operator or actuator mounted on the valve. The valve should instead be lifted by locating holes or through a nylon sling.
- Next, the valve should be placed between the flanges. The flanges should be centred and the bolts inserted, and hand tightened.
- Open the disc carefully to ensure that the disc doesn’t contact the inside of the adjacent pipes.
- Close the valve disc slowly and ensure clearance of the disc edge.
- Open the disc fully and make sure to tighten all the bolts.
- Repeat the full closing process to a fully open process rotation. This is just to make sure that the clearance is smooth and accurate.
Butterfly Valve Maintenance
Greasing and rusting are very unfavorable situations so you must take care of and protect the butterfly valves from them. The following are the steps you can do to take care of your butterfly valves.
- There is a grease fitting at the top of the valve you may not notice when you first get your butterfly valve. You can put grease at an opening in the neck of your butterfly valve. The excess grease will flow out.
- Lithium-based grease can be applied to the gearbox.
- Use any silicon-based lubricant to clean the butterfly valve.
- You should rotate or cycle the butterfly valve if it’s not used daily. This can be done once a month to ensure mobility.
- Check if the valve operates properly In both closed and open positions. Adjust them if necessary.
- Check the valve if you feel like there might be a leakage problem. Regular inspection is the key. You should also inspect the other parts like the piping, bolts, etc., for any possible issues that may arise.
Custom Butterfly Valve Materials
DBV butterfly valve supplier offers complete butterfly valve automation services to global clients. Our company can supply special automated butterfly valve assemblies designed around your products or your particular applications.
Available butterfly valve material selections:
- Carbon Steel: WCB, LCB, WCC, LC1, A105, LF2
- Stainless Steel: CF8, CF8M, CF3, CF3M, 310S, 904L, F304, F316, F304L, F316L, CF8C, F347
- CR-MO Alloy: WC6, WC9, C5, C12A, F11, F22, F5, F91
- Duplex Stainless Steel: 4A, 5A, 6A, F51, F53, F55
- Copper Alloy: C95800, C95500, C83600
- Monel Alloy: MONEL 400, MONEL 500, M35-1
- Inconel Alloy: INCONEL600, INCONEL 625, INCONEL 800
- Titanium Alloy: TITANIUM GR2, GR3, GR5, GR12
- Hastelloy: Hastelloy C-276
Why Choose DBV Butterfly Valve Manufacturer?
- Rich experience: DBV is a reliable butterfly valve supplier with 14 years of experience. We have provided custom butterfly valves to customers ranging from small equipment manufacturers to World famous Manufacturing, Pharmaceutical, and Chemical companies.
- Competitive prices: DBV butterfly manufacturer has its own manufacturing plant in China, so affordable factory-direct prices are available.
- Custom butterfly valve service: DBV butterfly manufacturer offers one-stop custom butterfly valve manufacturing service to meet different demands of customers.
Butterfly Valve End Connections
- Threaded or screwed valves
These valves are usually used in sample points for instrument connections.
Butt-welded is primarily used in high temperature or high-pressure operations.
For different piping use, flanged valves are the most common ones.
- Socket Welded
They are most commonly present on small-bore piping where the threaded connections are not allowed.
- Wafer and Lug
They are usually installed in those systems where there is limited space. They are most often used as compact valves.
Contact Us: Feel free to contact us if you want to know more details of our butterfly valves or our service. DBV butterfly valve manufacturer will reply to you in 12 hours.