Spiral valve used in dispensing device and dispensing device

The utility model relates to a spiral valve used in a dispensing device. The screw valve includes a housing and a screw. The housing includes a cylindrical portion and a nozzle at an end of the cylindrical portion. The screw is rotatably disposed in the housing and has an outer peripheral surface and a thread disposed on the outer peripheral surface, and a channel for distributing the fluid is formed between the outer peripheral surface of the screw and the inner peripheral surface of the cylindrical portion. The channel sequentially comprises a first feeding section, a second compression section, a third pressure relief section and a fourth metering section in the axial direction of the cylindrical part. Gaps exist between threads of at least one part of threads in the first feeding section and the third pressure relief section and the inner circumferential surface of the cylindrical part, and threads of threads in the second compression section and the fourth metering section are in contact with the inner c