Drainage device for still kettle

The drainage device comprises a drainage pipe, the drainage pipe is communicated with a normally-closed pneumatic valve, the pneumatic valve is coupled with a timing control circuit used for controlling the pneumatic valve to be opened and closed in a delayed mode, and the timing control circuit comprises a trigger switch K1, a timing unit and a switch unit. The timing unit is coupled to the trigger switch K1, and the switch unit is coupled to the delay unit and connected in series in a power supply loop of the pneumatic valve. The drainage device has the advantage that the automatic drainage function of the drainage device is good. 本申请涉及一种用于蒸压釜的排水装置，其包括排水管，所述排水管连通有常闭型的气动阀，所述气动阀耦接有用于控制气动阀开启并延时关闭的定时控制电路，所述定时控制电路包括触发开关K1、定时单元以及开关单元，所述定时单元耦接于触发开关K1，所述开关单元耦接于延时单元并串联在气动阀的供电回路中。本申请具有排水装置的自动排水功能较好的效果。