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Introduction of Ventilation Butterfly Valve

  • 2021-05-04 16:38

Ventilation butterfly valve is a simple regulating valve, and it can also be used for on-off control of low-pressure pipeline media. Ventilation butterfly valve is a non-closed butterfly valve. Ventilation butterfly valves are used in dusty cold air or hot air gas pipelines for ventilation and environmental protection projects in chemical, building materials, power stations, glass and other industries, as a pipeline control device for regulating flow or cutting off the gas medium. This type of valve should generally be installed horizontally in the pipeline.

Its structural characteristics have the following two points:

1. It is designed and manufactured with a new structural form of welding of center-line disc plate and short structural steel plate, compact structure, light weight, easy to install, small flow resistance, large circulation, and avoid high temperature expansion. Impact, easy to operate.
2. There are no connecting rods, bolts, etc., so it works reliably and has a long service life. It can be installed in multiple stations and is not affected by the flow direction of the medium


Ventilation butterfly valve installation points:
1. The installation position, height, and inlet and outlet directions must meet the design requirements. Note that the direction of the medium flow should be consistent with the arrow direction marked on the valve body, and the connection should be firm and tight.
2. The valve must be visually inspected before installation. The nameplate of the valve should comply with the current national standard "General Valve Marking" GB 12220. For valves with a working pressure greater than 1.0 MPa and a cut-off function on the main pipe, the strength and tightness performance test shall be carried out before installation, and the valve shall be used only after it is qualified.

During the strength test, the test pressure is 1.5 times the nominal pressure and the duration is not less than 5min. The valve housing and packing should be qualified without leakage. During the tightness test, the test pressure is 1.1 times the nominal pressure; the duration of the test meets the requirements of GB 50243. Ventilation butterfly valve installation instructions:

1. Before installation, you must carefully check whether the valve's mark and certificate meet the requirements for use, and clean it after verification. Uninstalled valves should be stored in a dry room. Valves stored for a long time should be cleaned regularly, dried and coated with anti-rust oil. Blind plates shall be used to protect the flange sealing surface at both ends of the valve.
2. Install according to the flow direction of the medium; horizontal installation is preferred.
3. The connecting bolts of the ventilation butterfly valve and the pipeline should be tightened several times in the diagonal direction during installation, and no single piece should be tightened at a time to prevent the flange connection from leaking due to uneven force.

4. When installing the ventilating butterfly valve, the butterfly plate should be in the closed position to prevent debris from entering the valve cavity and scratching the sealing surface. When the user wants to test the pressure, be sure to install the flange pair at both ends and then test the pressure.
5. When connecting the valve to the pipeline, it is required to use butt welded steel flanges or special flanges for ventilation butterfly valves on the pipeline. If flat-welded steel flanges are used, the inner hole of the flange must be as large as the inner hole of the gasket to ensure the effective sealing surface of the gasket.
6. The opening and closing stroke of the control mechanism has been adjusted when the ventilation butterfly valve leaves the factory. In order to prevent the direction from being wrong when the power is turned on, the user must manually move to 1/3 of the closed position before turning on the power for the first time. And check whether the direction of the indicator wheel is consistent with the opening direction of the valve. 7. When the valve is in use, if any malfunction is found, stop using it immediately.

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