A fluid regulator comprising: a valve body having an inlet, an outlet, and a flow path connecting the inlet and the outlet; and an actuator assembly that is insertable into the valve body through one of the inlet or the outlet and including: a sleeve that includes a cylindrical wall (66a, 66b), a first plate, a second plate spaced from the first plate, a first end, and a second end, the cylindrical wall (66a, 66b) defining a cavity (74, 75) and each of the first plate and the second plate disposed in the cavity (74, 75), the first end having a first inner diameter (S 1) and the second end having a second inner diameter (S 2) different from the first inner diameter (S 1); two or more pistons (60, 62) that define a plurality of chambers (88, 90, 92, 94) within the sleeve and that are couplable to a stem (54; 236; 238; 240; 242), wherein two or more of the plurality of chambers (88, 90, 92, 94) are fluidly connected via a first passage (82, 248) within the stem (54; 236; 238; 240; 242), wherein the plurality of chambers (88, 90, 92, 94) includes: a first chamber disposed between the first plate of the sleeve and a first piston; a second chamber disposed between the first piston and the second plate; a third chamber disposed between the second plate and a second piston; and a fourth chamber disposed opposite the second piston from the third chamber, wherein the first chamber and the third chamber are in fluid communication, and the second chamber and the fourth chamber are in fluid communication via the first passage (82, 248) of the stem; wherein the flow path connecting the inlet and the outlet is located peripherally relative to the actuator assembly, characterized in that the fluid regulator further comprises a second passage extending partially through the stem, the second passage being in fluid communication with the first chamber and in fluid communication with the third chamber. a valve body having an inlet, an outlet, and a flow path connecting the inlet and the outlet; and an actuator assembly that is insertable into the valve body through one of the inlet or the outlet and including: a sleeve that includes a cylindrical wall (66a, 66b), a first plate, a second plate spaced from the first plate, a first end, and a second end, the cylindrical wall (66a, 66b) defining a cavity (74, 75) and each of the first plate and the second plate disposed in the cavity (74, 75), the first end having a first inner diameter (S 1) and the second end having a second inner diameter (S 2) different from the first inner diameter (S 1); two or more pistons (60, 62) that define a plurality of chambers (88, 90, 92, 94) within the sleeve and that are couplable to a stem (54; 236; 238; 240; 242), wherein two or more of the plurality of chambers (88, 90, 92, 94) are fluidly connected via a first passage (82, 248) within the stem (54; 236; 238; 240; 242), wherein the plurality of chambers (88, 90, 92, 94) includes: a first chamber disposed between the first plate of the sleeve and a first piston; a second chamber disposed between the first piston and the second plate; a third chamber disposed between the second plate and a second piston; and a fourth chamber disposed opposite the second piston from the third chamber, wherein the first chamber and the third chamber are in fluid communication, and the second chamber and the fourth chamber are in fluid communication via the first passage (82, 248) of the stem; wherein the flow path connecting the inlet and the outlet is located peripherally relative to the actuator assembly, characterized in that the fluid regulator further comprises a second passage extending partially through the stem, the second passage being in fluid communication with the first chamber and in fluid communication with the third chamber. a sleeve that includes a cylindrical wall (66a, 66b), a first plate, a second plate spaced from the first plate, a first end, and a second end, the cylindrical wall (66a, 66b) defining a cavity (74, 75) and each of the first plate and the second plate disposed in the cavity (74, 75), the first end having a first inner diameter (S 1) and the second end having a second inner diameter (S 2) different from the first inner diameter (S 1); two or more pistons (60, 62) that define a plurality of chambers (88, 90, 92, 94) within the sleeve and that are couplable to a stem (54; 236; 238; 240; 242), wherein two or more of the plurality of chambers (88, 90, 92, 94) are fluidly connected via a first passage (82, 248) within the stem (54; 236; 238; 240; 242), wherein the plurality of chambers (88, 90, 92, 94) includes: a first chamber disposed between the first plate of the sleeve and a first piston; a second chamber disposed between the first piston and the second plate; a third chamber disposed between the second plate and a second piston; and a fourth chamber disposed opposite the second piston from the third chamber, wherein the first chamber and the third chamber are in fluid communication, and the second chamber and the fourth chamber are in fluid communication via the first passage (82, 248) of the stem; wherein the flow path connecting the inlet and the outlet is located peripherally relative to the actuator assembly, characterized in that the fluid regulator further comprises a second passage extending partially through the stem, the second passage being in fluid communication with the first chamber and in fluid communication with the third chamber.