All categories
Featured selections
Trade Assurance
Buyer Central
Help Center
Get the app
Become a supplier
(4772 products available)
Butterfly check valves are usually in two ways. They differ in the mechanism used for sealing and controlling flow. They include:
Elastic (Rubber-Supported) Seat Butterfly Check Valves
The elastic seat butterfly check valve is one with an elastic seat made from rubber or another flexible material. The seat is usually positioned within the valve body, around the disc. This valve type uses a disc that rotates or pivots to close when flow reverses. Typically, a rubber seat provides a better seal than metal-on-metal designs. This ensures minimal backflow. The set helps absorb shock. It reduces noise and wear on the valve components and the connected piping.
Metal Seat Butterfly Check Valves
Metal seat butterfly check valves have a disc and a seat made from metal. The metals can include bronze, stainless steel, or other metals. The disc provides a more durable and abrasion-resistant surface. It is so especially in contexts of high temperatures and pressures, or harsh chemical environments. This makes these valves to be more suitable for industrial settings. The metal seat version requires more maintenance than the elastic seat version. The reason is that it is more prone to wear and requires periodic inspection and replacement of the disc and seat.
Butterfly check valves come in diverse features. They include:
Valves Operation
A butterfly valve checks operates by a disc which is mounted on a shaft. During operation, this disc is positioned parallel to the flow path. When fluid flows in the direction of the valve, the disc will be held open by the fluid pressure. This allows the fluid to pass through. When there is a backflow or when the pressure drops, the disc swings shut to its original position. This helps to prevent backflow, thus protecting against reverse flow.
Design
Butterfly check valves have a simple and compact design. This makes them easier to install in tight spaces compared to other check valves. They feature a disc and a seat which helps in providing a seal against backflow. In addition, its design contributes to lower pressure drop across the valve. It also requires less maintenance as compared to other check valves.
Durability
These valves are made using sturdy materials such as stainless steel, ductile iron, and carbon steel. Some have also been coated with corrosion-resistant materials to enhance their durability. Corrosion-resistant coating include epoxy or nylon.
Applications
Butterfly check valves are normally applied in diverse industries such as water and wastewater treatment facilities, power generation, oil and gas, and chemical processing. They are also used in HVAC systems and other commercial and industrial settings where backflow prevention is crucial.
Types
Butterfly check valves are in various types that are designed for specific applications. Common types include installed on horizontal or vertical pipelines, called standard butterfly check valves. There are also pneumatic butterfly check valves which combine a check valve function with the ability to control fluid flow through the use of compressed air. This provides automation without a manual intervention requirement.
Sealing and Noise Reduction
Some butterfly check valves are designed with elastic seats made of rubber or other soft materials. These valves, therefore, offer superior sealing capabilities. It helps in reducing operational noise. This soft material seat provides a better seal than metal-to-metal contact. It helps to minimize leakage. Soft materials also help in absorbing shock. They thus reduce noise transmitted through the pipeline. This feature is particularly beneficial in residential or commercial settings. In these places, excessive noise can be disruptive or undesirable.
Valve Material
One needs to consider the material of the butterfly check valve. This is more so if the valve is to be used in an area prone to corrosion. For instance, a valve made of stainless steel should be used in such a case. A butterfly valve can also be made of high-strength plastics like PVC.
Pressure and Temperature Ratings
Different butterfly check valves are suited for different pressures and temperatures. Thus, ensure the valve's rating matches the operating conditions of the system. Operating conditions can include such factors as fluid type, pressure, and temperature. A suitable valve should not only withstand the system’s conditions. It must also be able to operate efficiently within them.
Maintenance Needs
Maintenance is another factor to put into consideration when purchasing a butterfly check valve. An automatic closure valve may be ideal for places that are not easily accessible. They do not require frequent maintenance. On the other hand, if one prefers a manual check, go for valves that are easy to open and accessible.
Installation Position
Some check valves are better suited for horizontal or vertical installations. Such include butterfly valve check valves. Thus, ensure the valve is compatible with the orientation of the installation. There are also valves that can be installed in any orientation. They provide more flexibility in installation.
Fluid Characteristics
The fluid being controlled by the butterfly check valve should also be a consideration just like others mentioned above. For example, high-viscosity fluids will need a valve with a larger disc to allow easy passage. Conversely, low-viscosity fluids can use a valve with a smaller disc.
Customization Options
Some manufacturers of butterfly check valves offer customization options. What this means is that one can be able to select specific features to erg their needs. This can include material selection, sealing types, or size.
Cost Considerations
Cost is also a factor to consider when purchasing a butterfly check valve. While butterfly valves are usually more affordable than other check valve types, the overall cost will depend on the materials, size, and features of the valve. In addition, one should consider long-term costs such as maintenance and replacement.
Yes, some butterfly check valves are designed for versatile installations. They can be installed on either vertical or horizontal pipelines. However, the manufacturers recommend them to be installed on horizontal pipelines.
Butterfly valves
require very low maintenance. The only common maintenance practice done is periodic inspection. It is to ensure the valve operates correctly. However, a bit more attention may be required for valves in high-duty cycles or extreme conditions. These might include situations with high-pressure or temperature fluctuations or corrosive environments.A butterfly check valve's main function is to provide backflow prevention. It protects the system from the hazardous effects of fluid reversal. These hazards can include contamination, equipment damage, or system failure, among others. In addition, these check valves also allow efficient fluid flow. This gives them a distinct pressure drop as compared to other check valve types.
Butterfly check valves are generally suitable for a wide range of liquid and gas types. They include those that are non-viscous or have a moderate viscosity. Unfortunately, they are not ideal for high-viscosity fluids. These fluids may not easily pass through the valve.
Yes, there are butterfly check valves that are manufactured to withstand high temperatures. They are commonly made from materials like brass, stainless steel, or duplex steel.
