Simple introduction of pneumatic cut-off valve
    Pneumatic 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, there is lifting lever (valve rod, the handwheel don't lift), there are also lift rotating lever (hand wheel rotating lifting with the valve stem and nut in the body).

    The characteristics of
    (1) simple structure than gate valves, manufacturing and maintenance are convenient.
    (2) the sealing surface is not easy to wear and abrasion, good sealing, open/close when there is no relative sliding between the disc and body sealing surface, thus wear and scratches are not serious, good sealing performance, long service life.
    (3) the opening and closing, the valve stroke is small, so stop valve height is smaller than gate valves, but the structure length is longer than gate valves.
    (4) the open-close torque, opening and closing is arduous, opening and closing time of the principal.
    (5) the fluid resistance is big, because the body medium channel is more twists and turns, fluid resistance is big, big power consumption.
    (6) fully open when the disc is often affected by erosion.