Structural Features and Principles of Electrically Actuated Butterfly Valves for Ventilation

Release time:

2021-08-30

The electric pneumatic ventilation butterfly valve is used in ventilation and environmental protection systems across industries such as chemical engineering, building materials, power plants, and glass manufacturing. It serves as a pipeline control device for regulating flow or shutting off dusty cold or hot air gases in pipelines. In general, this ventilation valve should be installed horizontally in the pipeline.

yingbei A butterfly valve is a simple-structured regulating valve that can also be used for on-off control of media in low-pressure pipelines. An electrically actuated ventilation butterfly valve is a non-sealed type of butterfly valve. Electrically and pneumatically actuated ventilation butterfly valves are employed in ventilation and environmental protection systems across industries such as chemical processing, building materials, power plants, and glass manufacturing, where they serve as pipeline control devices for regulating gas flow or shutting off the flow of dusty, cold or hot air gases. In general, this ventilation valve should be installed horizontally in the pipeline.

Structural Features of Electrically Actuated Butterfly Valves with Ventilation Function

1. This new structural design, featuring a centerline-type disc plate welded to a short-structure steel plate, boasts a compact layout, lightweight construction, ease of installation, low flow resistance, large flow capacity, and effortless operation.

2. It has no connecting rods, bolts, or similar components, ensuring reliable operation and a long service life. It can be installed at multiple stations and is unaffected by the flow direction of the medium.

Uses of the ventilation butterfly valve

The ventilation butterfly valve is a non-hermetic type of butterfly valve widely used in production processes such as building materials, metallurgy, mining, and power generation, where the medium temperature is ≤300℃ and the nominal pressure is 0.1 MPa. It is employed to connect, open/close, or regulate the flow of media in pipelines.

The working principle of an electrically actuated butterfly valve.

The electrically actuated butterfly valve is driven by an electric motor that powers the actuator, enabling the butterfly disc to rotate freely within a 90° range to achieve the purpose of opening, closing, or regulating the flow of the medium. Electric actuators typically operate at 220V or 380V and are available in both on-off (switch-type) and modulating (regulating) versions.

Key points for installing a ventilation butterfly valve

1. The installation location, height, and inlet/outlet directions of the device must comply with the design requirements. Pay attention to ensuring that the flow direction of the medium is consistent with the arrow direction marked on the valve body, and that the connections are secure and tight.

2. Before installing the valve assembly, a visual inspection must be conducted. The valve’s nameplate shall comply with the requirements of the current national standard “General Valve Marking” GB12220. Prior to installation, both strength and tightness tests must be performed; only valves that pass these tests are permitted for use. During the strength test, the test pressure shall be 1.5 times the nominal pressure, and the duration shall be no less than 5 minutes. The valve body and packing shall show no leakage to be considered qualified. During the tightness test, the test pressure shall be 1.1 times the nominal pressure; the duration of the test shall meet the requirements specified in GB50243.

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