PURPOSE: To provide a change curve of pressure or speed controlled at each pressure reducing step without necessitating large cost by providing a third flow dimension for the principle of a flow which is branched, restricted inflated, collected, and rotates, and collides.

CONSTITUTION: A flow from a high pressure side to an oblique line part 20 flows through a restriction formed in a flow passage 14 of a sleeve 13, and this restriction is shrunk due to the operation of a program step 15a of a program disc 15. A flow of fluid passing through each of the flow passages 14 is branched in this section and flows on the opposite side in an annular flow passage 20 of a collection ring, and this flow passage 20 functions as a recovery chamber or an expansion chamber. A slot 23 of rings 17a to 17e on a boundary face between the rings 17a to 17e and the annular flow passage 20 forms a second restriction or a pressure reducing step. Fluids flowing from both directions meet at an inlet to a step 23 and are collected again before a flow restricted at the step 23 is generated and energy is consumed in accordance with it.