ROTARY CONTROL VALVES WITH SILENCING MEANS

摘要

The rotary control valve has a casing defining a receptacle therein. The casing has a main axis and spaced flow ports which communicate with the receptacle through a fluid flowway. A flow-control member is rotatably disposed within the receptacle. The member has a body which is shaped to fit said receptacle and which defines an axial bore opening through the outer wall of its body, whereby, in use, the opposite open ends of the bore are in register with the flow ports when the control member is in its fully-open position The wall of the member's body has a pair of elongated orifice slots extending circumferentially of the body in opposite directions, generally from the opposite open ends of the wall of the bore. Each of the slots is defined by converging walls. The body has non-slotted closure portions between the trailing ends of the orifice slots and the adjacent ends of the bore. The closure portions are adapted to close off the flow ports in the flowway-closing position of the control member. The improvement resides in that the body has a silencing chamber surrounding the wall of the bore, and silencing means are disposed in the silencing chamber.