Pressure variated adsorption program control valve

The utility model relates to a pressure varying adsorption program control valve which comprises a driving cylinder 14, a valve clack 2 and a valve cap 3, wherein, stuffing and a gland 6 are arranged between a stuffing box 19 of the valve cap 3 and a valve rod 7, and the inner surface of the stuffing 31 is provided with at least two dust removing rings 29 embedded into a groove in the inner surface; each dust removing ring 29 is composed of an elastic material 32 at the lower part and a hard plastic layer 33 at the upper part, the inner surface of the stuffing between the dust removing rings 29 is embedded with a sealing ring 20, and the outer surface of the stuffing is also provided with the sealing ring 20.