Device for recycling high-medium-low-pressure graded energy by using drain valve

The utility model discloses a device for recycling high, medium and low pressure grading energy by using a drain valve, which comprises a pit for discharging sewage, a still kettle is arranged above the pit, the sewage discharging end of the still kettle is communicated with the pit, a low-pressure flash tank and a high-pressure flash tank are respectively arranged beside the still kettle, and the low-pressure flash tank and the high-pressure flash tank are communicated with the pit. A low-pressure drain pipe for conveying low-pressure water is arranged between the output end of the still kettle and the input end of the low-pressure flash tank, and a high-pressure drain pipe for conveying high-pressure water is arranged between the output end of the still kettle and the input end of the high-pressure flash tank. According to the utility model, the problem of low energy utilization rate in the traditional still kettle in the prior art is solved. The utility model has the advantages of high energy utilization r