Abstract: The rotary control valve comprises a casing having a pair of axially-opposed ports. A valve chamber is rotatably mounted in the casing. A stem adjustably rotates the valve chamber for controlling the flow through the ports. The valve chamber has a pair of axially-opposed, off-center orifices, each being contiguous to and movable into and out of partial and full registration with its associated port. An off-center tube is disposed inside chamber and extends between the orifices. A pressure-reducing medium in the valve chamber. The medium includes a plurality of stacked, axially-spaced discs, each having a pattern of axial holes for dividing the flow thereacross.

Abstract: The gate and swing valve has a body which defines at least one valve seat. A closure member inside the valve is pivotably mounted on a support. A cam and cam follower operatively couple the cam to the closure member. A stem has one end coupled to the cam for moving the closure member in a linear motion, in a swinging motion, and then in a linear motion toward the valve seat.

Abstract: The valve comprises a casing which defines a receptacle having a main axis. The receptacle has a pair of opposed ports forming a flowway having an axis disposed at an acute angle to the main axis. A flow-control element is rotatably disposed within the receptacle. The element has an axis of rotation coaxial with the main axis. The body of the control element defines an axial open bore. The bore is in register with the flow ports at the fully-open position of the control element. A pair of elongated orifice slots extend circumferentially through the wall of the control element's body. At least one slot is defined by wall converging toward its trailing end. A chamber surrounds the walls of the axial bore in the control element's body. Silencing means in the body of the control element produce a silencing effect on the fluid flowing through the flowway only when the flowway is throttled by the orifice slots.