CAGE FOR ADJUSTING VALVE, ADJUSTING VALVE, AND PIPING SILENCER

PURPOSE:To attempt low noise while keeping a flow rate and a size by providing a plurality of recessed parts in a passage, laminating a plurality of discs, and constituting a passage by a labyrinth-type passage. CONSTITUTION:In an adjusting valve 10, when high pressure fluid is allowed to flow from an opening 21 to an opening 22 in a casing 11, a valve plug 13 is moved together with a valve shaft 18 inside an adjusting valve cage 12, so as to control the high pressure fluid. When the high pressure fluid is allowed to flow to the adjusting valve 10, the fluid is allowed to flow through a passage 32 penetrating a cage 12. Also in this time, impulsive wave is transmitted in the passage 32. Incident impulsive wave is divided into transmitting impulsive wave and many reflecting impulsive wave groups by a bent part in the labyrinth-type passage, so as to damp the transmitting impulsive wave. Moreover, the transmitting impulsive wave is damped by expansion wave from respective grooves, and it is damped since the reflecting impulsive wave to catch up the damped impulsive wave is weakened by the grooves. Particularly, the grooves provided on the outside wall surface of the bent part of the labyrinth-type passage 32 weakens the reflecting impulsive wave. Thereby, noise can be decreased.