The corrugated pipe cut-off valve opening and closing is plug valve, sealing surfaces appear flat or cone, disc make linear movement along the centerline of fluid. Stem form of exercise, lifting lever ( rod and hand wheel lifting) And lift rotating lever ( Hand wheel rotating lifting with the valve stem and nut in the body) 。 Bellows globe valve is only applicable to all opened seated, not allowed to adjust and throttling. Bellows globe valve belongs to compulsory sealed valve, the valve is closed, must be pressure on the disc, to force a sealing surface does not leak. When medium by disc below into the valve 6, the operating force needed to overcome the resistance, is stem and packing of the friction force and the thrust produced by medium pressure, close the valve strength is stronger than open the Industrial Valves, so it's bigger, the diameter of the stem or stem top bending failure happens. In recent years, from the seal valve, cut-off valve is replaced by the disc above the medium flow direction into the valve cavity, in the medium pressure at this moment, close the valve of the force is small, and the strength of the valve, the Industrial Valves stem diameter can be reduced accordingly. At the same time, in the role of media, this kind of valve is tight. Our valve & quot; Order to & quot; Once, the flow of corrugated pipe cut-off valve, shall be applied. The corrugated pipe cut-off valve opens, the opening of the disc height, is 25% ~ 30% of nominal diameter, flow has reached maximum, said valve to full open position. So the corrugated pipe cut-off valve fully open position, should be determined by disc's schedule.

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