Ventilation butterfly valve installation requirements

Ventilation butterfly valve installation requirements

Ventilation butterfly valve is a simple structure, easy operation of the regulating valve, but also can be used for low-pressure pipe medium switching control. Electric ventilation butterfly valve. Ventilation butterfly valve is a non-hermetic butterfly valve. Ventilation butterfly valves are widely used in ventilation, environmental protection projects in the power station, building materials, glass and other industries in dusty cold air or hot air gas pipelines, as a gas medium to regulate the flow or cut off the pipeline control device. This type of valve should generally be installed horizontally in the pipeline. 1. The installation position, height and inlet and outlet direction must meet the design requirements. Note that the direction of the medium flow should be consistent with the arrow direction of the valve body, and the connection should be firm and tight. 2. Before the valve is installed, a visual inspection must be performed. The nameplate of the valve shall comply with the current standard "General Valve Mark" GB 12220 . For valves with a working pressure greater than 1.0 MPa and a cut-off effect on the main pipe, strength and tightness tests shall be performed before installation, and they shall be used only after being qualified. In the strength test, the test pressure is 1.5 times the nominal pressure , and the duration is not less than 5 minutes . The valve housing and the packing should have no leakage as qualified. In the tightness test of the ventilation butterfly valve , the test pressure is 1.1 times the nominal pressure ; the duration of the test meets the requirements of GB 50243 .

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