A fluid regulator, comprising: a valve body (406; 600) having a main passageway (410; 602) defining an orifice to fluidly couple an inlet and an outlet, wherein the main passageway (410; 602) defines an inlet volume boundary between the inlet and the orifice and an outlet volume boundary between the orifice and the outlet, and wherein a portion of the outlet volume boundary includes an inner wall (508; 608) adjacent the orifice, the orifice including a longitudinal axis; a valve plug disposed within the main passageway (410; 602) with the inner wall (508; 608) in close proximity to an outer surface of the valve plug such that the inner wall (508; 608) and the valve plug direct a fluid flow toward the outlet and restrict fluid flow between the inner wall (508; 608) and the outer surface of the valve plug and substantially restrict fluid flow toward a throat of the valve body (406; 600); a valve stem coupled to the valve plug; a stem guide spaced away from the inner wall of the valve body, the stem guide aligning the valve stem and the valve plug, the stem guide including a passageway in fluid communication with the throat; an actuator coupled to the valve body (406; 600), the actuator including a sensing chamber in fluid communication with the throat via the passageway; a secondary fluid passage (512; 604) adjacent the orifice and comprising an opening (514; 606) formed in a portion of a perimeter of the inner wall (508; 608) of the valve body (406; 600) within the outlet volume boundary to increase fluid flow toward the throat of the valve body (406; 600) when a fluid flows across the orifice, wherein the secondary fluid passage (512; 604) extends parallel to the longitudinal axis of the orifice between the orifice and the throat, and allows fluid communication between the orifice and the throat; and wherein the opening extends between two opposing ends (518, 520) of the inner wall, and wherein the opposing ends (518, 520) are substantially parallel to the longitudinal axis of the orifice, characterised in that: the sensing chamber is in fluid communication with the outlet via the throat. a valve body (406; 600) having a main passageway (410; 602) defining an orifice to fluidly couple an inlet and an outlet, wherein the main passageway (410; 602) defines an inlet volume boundary between the inlet and the orifice and an outlet volume boundary between the orifice and the outlet, and wherein a portion of the outlet volume boundary includes an inner wall (508; 608) adjacent the orifice, the orifice including a longitudinal axis; a valve plug disposed within the main passageway (410; 602) with the inner wall (508; 608) in close proximity to an outer surface of the valve plug such that the inner wall (508; 608) and the valve plug direct a fluid flow toward the outlet and restrict fluid flow between the inner wall (508; 608) and the outer surface of the valve plug and substantially restrict fluid flow toward a throat of the valve body (406; 600); a valve stem coupled to the valve plug; a stem guide spaced away from the inner wall of the valve body, the stem guide aligning the valve stem and the valve plug, the stem guide including a passageway in fluid communication with the throat; an actuator coupled to the valve body (406; 600), the actuator including a sensing chamber in fluid communication with the throat via the passageway; a secondary fluid passage (512; 604) adjacent the orifice and comprising an opening (514; 606) formed in a portion of a perimeter of the inner wall (508; 608) of the valve body (406; 600) within the outlet volume boundary to increase fluid flow toward the throat of the valve body (406; 600) when a fluid flows across the orifice, wherein the secondary fluid passage (512; 604) extends parallel to the longitudinal axis of the orifice between the orifice and the throat, and allows fluid communication between the orifice and the throat; and wherein the opening extends between two opposing ends (518, 520) of the inner wall, and wherein the opposing ends (518, 520) are substantially parallel to the longitudinal axis of the orifice, characterised in that: the sensing chamber is in fluid communication with the outlet via the throat.