Pressure reduction and speed control assembly, sleeve and regulating valve

The invention discloses a pressure reduction and speed control assembly, a sleeve and a regulating valve, and belongs to the technical field of regulating valves. The pressure reduction and speed control assembly comprises a connecting piece and at least two partition plates. Each partition plate comprises a first part and a second part, each first part is provided with a first through hole, and one side of each second part is provided with an inclined slope surface of which the thickness is gradually reduced in the direction close to the first part to far away from the first part; the at least two partition plates are located between a first end and a second end of the connecting piece, wherein the first end is opposite to the second end, and a second through hole is formed in the connecting piece between every two adjacent partition plates in the at least two partition plates; and the first parts and the second parts of the at least two partition plates are sequentially and alternately located on one side o