Control valve

A control valve for regulating the pressure of a fluid flow, comprising valve housing means having an inlet port and an outlet port, flow passage means operatively interconnecting said inlet and outlet ports, flow impedance means operatively located in said flow passage means, valve closure means operatively arranged in said valve housing means for cooperation with said flow impedance means for opening and closing said flow passage means, said flow impedance means comprising a plurality of hollow cylindrical sleeves nested one in the other in a liquid-tight manner, said sleeves (15) comprising a plurality of circumferential grooves (19), pairs of through-bores (20) and pairs of blind bores (18) arranged in alternating succession along the respective circumferential groove, each circumferential groove operatively interconnecting the through-bores and blind bores arranged alongside the respective groove, said sleeves being arranged relative to one another in such positions that the through-bores in one sleeve register at least partially with the blind bores in the next adjacent sleeve so that fluids flowing into the blind bores forming a pair collide with each other in the groove to thereby flow apart again in opposite directions in the respective groove on both sides of the pair of blind bores (18) for further colliding between the through-bores of the next adjacent pair of through bores with fluid flows coming from adjacent pairs of blind bores (18).