large-diameter swing check valve is introduced along with the rising of the swing check valve diameter, for normal operation of the valve, the weight of the disc and stroke will eventually become too big.

therefore, greater than DN600 ( NPS24） Swing check valves are designed to be more disc swing check valve, the Industrial Valves in the media channels on more than a piece of the seat plate, placed some regular swing on its disc.

to prevent the disc in a stalled position, swing check valves can be installed vertically. But, in the fully open position, determined by the weight of the disc closing torque is very small, so the valve will tend to shut down slowly. In order to overcome such slow response to put back the clock, the disc can be equipped with a heavy hammer or spring load lever ( Figure 2 - 55) 。

FIG. 2 56 the check valve as shown in the double disc swing check valves, a torsional spring load of the type D disc, placed across the valve hole on the reinforcement of elbow. This structure reduces the disc center of gravity moving distance; With the same size of the single disc swing check valves, compared the structure also reduced 50% of the weight of the disc. The adoption of torsional spring load, the valve react very quickly to put back the clock.

butterfly check valve is introduced

3. Butterfly check valve ( Figure 2 - 57) Its shape similar to the butterfly valve. The seat is tilted, the butterfly plate ( The disc) Axis horizontal and located above the center line of the channel in the valve, greater than the upper shaft bottom disc area, when stop the flow of medium or counter-current, butterfly plate and countercurrent medium role on its own weight and rotation to the seat. The check valve has simple structure, but the sealing is poor, can only be installed in horizontal pipe runs.

butterfly check valve has the disadvantage of high cost, and the swing check valve repair is more difficult. Therefore, butterfly check valve is usually limited to swing check valve can not meet the requirements of the occasion.

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