The ventilation butterfly valve has excellent sealing performance at low temperature.The butterfly valve structure principle is suitable for environment analysis butterfly valve disc is installed in the pipe diameter direction.In the butterfly valve body cylindrical channel, disc butterfly plate around the axis of rotation, rotation Angle is 0°~90°, rotation to 90°, the valve brand is fully open state.Pneumatic ventilation butterfly valve simple structure, small volume, light weight, only a few parts.And only 90° rotation can be quickly opened and closed, simple operation, and the electric valve has good fluid control characteristics.Butterfly valve in the open position, butterfly plate thickness is the resistance of medium flow through the valve, so the pressure drop produced by the valve is very small, so it has good flow control characteristics.Butterfly valve with a bullet seal and metal seal two types of seal.Resilient sealing valve, the sealing ring can be embedded in the body or attached to the butterfly plate periphery.The valve with metal seal generally has longer life than the valve with elastic seal, but it is difficult to seal.
Notes for installation of ventilation butterfly valve:
The installation position and layout of the ventilation butterfly valve in the pipe network also have an impact on the use of the valve. The closed funnel is designed in the valve opening end or the valve connecting corner for the pipe with large smoke and dust. Regular dust removal can prevent excessive accumulation of dust, so as to facilitate the rotation of the butterfly plate.
1. The connecting bolts between the ventilation butterfly valve and the pipeline shall be tightened several times according to the diagonal direction during installation, and no single tightening shall be allowed to prevent leakage at the flange connection due to uneven force.
2. ventilation butterfly valve installation, should be in the closed position of the butterfly plate should be appropriate, to prevent debris into the valve cavity rub damage sealing surface, the user to test pressure, must use flange on both ends of the clamping pressure test.
3. When connecting the valve with the pipeline, it is required to use butt-welded steel flange or special flange for ventilation butterfly valve on the pipeline.If a flat welded steel flange is used, the flange inner hole is required to be as large as the gasket inner hole to ensure the effective sealing surface of the gasket.
4. Before installation, carefully check whether the mark and qualification certificate of the valve meet the requirements for use, and clean the valve after verification.Uninstalled valves should be stored in a dry room.Keep the valve for a long time, clean it regularly, blow dry and apply anti-rust oil.Blind plate shall be applied to protect flange sealing surface at both ends of valve.
5. Install according to the flow direction of medium;Horizontal installation is preferred.
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