Butterfly valve

Butterfly valve is a shut-off pipeline valve. The shut-off element is in the form of a disc that rotates about an axis perpendicular to the flow axis. The valve is closed when the disc plane is perpendicular to the pipeline axis and open when the plane coincides with the axis.

Working media

Butterfly valves are used to shut off the flow of water, steam, compressed air, and petroleum products with a wide range of working temperatures and pressures. All valves that you will find in our catalog can be used for shutting off the flow of water. The possibility of their use for pipes with other working media should be specified with the suppliers.

Application

Butterfly valves are widely used in pipelines with nominal passage diameters exceeding 50mm, in heating systems, water supply, boiler houses, heat points, and pumping stations, where small dimensions, repairability, and low cost are important.

Advantages

Low cost.
Simple and reliable design.
Possibility of fast opening.
Technically simple repair.
Possibility of quick replacement.
No need for technical maintenance.
Possible installation in any position.
Working medium flow is allowed in any direction.
Low metal consumption and as a result, low weight.
Simple operation, only a 90° turn of the handle is required to open it.
High corrosion resistance, the valve body does not come into contact with the working medium, as it is protected by a polymer insert (gasket).
Smallest dimensions along the pipeline axis, compared to shut-off valves of other types.
During flange installation, no additional sealing gaskets are required. The connection is sealed by compressing the end faces of the inserts between the valve body and the connecting flanges.

Disadvantages

Non-full bore design, the valve disc is always in the center of the flow.
Requires high torque, and as a result, long levers and gear drives are required for manual control, and expensive electric drives with high torque are required for automatic control.
Long levers complicate installation in confined spaces, for example, in thermal chambers and wells.
Abrasive wear of sealing gaskets often leads to premature loss of flow tightness.
Sharp opening can cause hydraulic shock, which is unacceptable for some systems.
Sealing class A is achieved only in valves with soft sealing, disc valves with metal/metal sealing of the shut-off element have sealing class B and below.

Similar names

Disc valve
Butterfly damper
Rotary valve
Rotary damper
Disc damper

What can be used as a replacement