Ventilation butterfly valve is used in the dusty cold air or hot air gas pipeline of ventilation, environmental protection engineering in chemical industry, building materials, power station, glass and other industries. It is used as a gas medium to regulate the flow or cut off the pipeline control device. Ventilation butterfly valves should generally be installed horizontally in the pipeline. When installing, you need to pay attention to two points:
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 direction of the arrow 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 Mark" GB 12220. For valves with a working pressure greater than 1.0 MPa and a shut-off effect on the main pipe, the strength and tight performance tests shall be carried out before installation, and shall be used after passing the test. In the strength test, the test pressure is 1.5 times the nominal pressure, the duration is not less than 5 min, and the valve casing and the packing should be free of leakage. In the rigorous test, the test pressure is 1.1 times the nominal pressure; the duration of the test complies with the requirements of GB 50243.
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