Abstract: Example multiple stage anti-surge valves are disclosed. In some examples, an apparatus includes a cage having a first section adjacent the valve seat with a first fluid flow passage, a second section spaced from the first section along a longitudinal axis of the cage with a second fluid flow passage, and a third section devoid of a fluid flow passage between the first and second sections. The example apparatus includes a plug slidably disposed in the cage, the plug having a third fluid flow passage through a skirt of the plug, the third fluid flow passage to be fluidly coupled to the second fluid flow passage during a stroke of the plug.

Abstract: A fluid control valve having a body, a seat ring, a valve cage adjacent the seat ring, a first valve plug assembly positioned within the valve cage, and a second valve plug assembly positioned within an axial bore of the first valve plug assembly. The first valve plug assembly has radial apertures in fluid communication with the axial bore and a first valve plug including the axial bore and a throttling port in fluid communication with the axial bore. The first valve plug assembly is movable between a closed position, in engagement with the seat ring, and an open position, spaced apart from the seat ring. The second valve plug assembly has a second valve plug that is movable between a closed position, in engagement with the first valve plug, and an open position, spaced apart from the first valve plug.

Abstract: Example multiple stage anti-surge valves are disclosed. In some examples, an apparatus includes a cage having a first section adjacent the valve seat with a first fluid flow passage, a second section spaced from the first section along a longitudinal axis of the cage with a second fluid flow passage, and a third section devoid of a fluid flow passage between the first and second sections. The example apparatus includes a plug slidably disposed in the cage, the plug having a third fluid flow passage through a skirt of the plug, the third fluid flow passage to be fluidly coupled to the second fluid flow passage during a stroke of the plug.

Abstract: A fluid control valve having a body, a seat ring, a valve cage adjacent the seat ring, a first valve plug assembly positioned within the valve cage, and a second valve plug assembly positioned within an axial bore of the first valve plug assembly. The first valve plug assembly has radial apertures in fluid communication with the axial bore and a first valve plug including the axial bore and a throttling port in fluid communication with the axial bore. The first valve plug assembly is movable between a closed position, in engagement with the seat ring, and an open position, spaced apart from the seat ring. The second valve plug assembly has a second valve plug that is movable between a closed position, in engagement with the first valve plug, and an open position, spaced apart from the first valve plug.

Abstract: A flow control valve includes an inlet, an outlet, and defines a fluid flow path. A valve seat is disposed within a valve body, and a valve plug in the valve body is surrounded by a cage. An exterior surface of the valve plug includes a plurality of notch sets, each notch set spaced apart from an adjacent notch set along the longitudinal axis, and the cage is disposed within the valve body and arranged to retain the valve seat, with an interior of the cage including a plurality of annular recesses. The annular recesses are spaced apart along the longitudinal axis, and the cage includes a plurality of apertures forming a portion of the fluid flow path. The notch sets and the recesses are arranged to form a plurality of turns in the fluid flow path when the valve plug is shifted toward the open position.