With the lever and weight mounted so that the weight assists the disc in closing, the valve closes more rapidly when flow stops, thus minimizing reversal of flow and resultant surge and shock.

• 通过安装杠杆和压铁，有助于阀瓣的关闭，当流体停止流动，阀门的关闭速度将更快，从而将流体倒流、波动和冲击降到最小程度。