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    The function of the globe valve Can a globe valve be used for the sewage pipe

    Posted by Bundor valve
    The function of the shut-off valve Can a shut-off valve be used for the sewage pipe? The main function of the globe valve in the pipeline is to cut off or connect the fluid. The regulating flow of the globe valve is better than that of the gate valve, but the globe valve cannot be used to adjust the pressure and flow for a long time. Otherwise, the sealing surface of the globe valve may be corroded and damaged by the medium. sealing performance.

    The globe valve can be used for pipelines such as water, steam and compressed air, but it is not suitable for medium pipelines with high viscosity, easy coking and sedimentation, so as not to damage the sealing surface.
    The globe valve is a forced sealing valve, so when the valve is closed, pressure must be applied to the valve disc to force the sealing surface not to leak. When the medium enters valve six from below the valve disc, the resistance that the operating force needs to overcome is the friction force between the valve stem and the packing and the thrust generated by the pressure of the medium. The force to close the valve is greater than the force to open the valve, so the valve The diameter of the stem should be large, otherwise the failure of the top of the valve stem will occur. In recent years, since the emergence of self-sealing valves, the medium flow direction of the globe valve has been changed from the top of the valve disc into the valve cavity. At this time, under the action of the medium pressure, the force to close the valve is small, while the force to open the valve is large, and the valve stem's force is small. The diameter can be reduced accordingly. At the same time, under the action of the medium, this form of valve is also tighter. my country's valve "Three Chemicals" once stipulated that the flow direction of the globe valve should be from top to bottom.
    When the globe valve is opened, when the opening height of the valve disc is 25%~30% of the nominal diameter, the flow rate has reached the maximum, indicating that the valve has reached the fully open position. Therefore, the fully open position of the globe valve should be determined by the stroke of the valve disc.
    So can the sewage pipeline use the shut-off valve? This depends on the purity of the sewage medium in the sewage pipeline.
    If the sewage does not contain particulate impurities or substances that are easy to precipitate and have high viscosity, the shut-off valve can be used for flow regulation or switch control.
    However, if there are impurities in the sewage, it is not suitable to use the globe valve to control the flow rate. The working principle of the globe valve is described above. If the medium contains impurities, it will affect the work of the globe valve, and it will be stuck on the valve seat and disc will affect the The tightness of the valve, stuck on the valve shaft or other places, will affect the operation of the globe valve.