A valve (200, 410, 420, 500, 510, 600, 610), comprising: a valve body including a longitudinal bore extending therethrough between first and second longitudinally opposed ends (202p, 202d); a first port, a second port, a third port and a fourth port extending through the valve body and configured for fluid communication with the bore; and a poppet assembly longitudinally slidable within the bore between an open position and a closed position in response to an actuating force, the poppet assembly including an inner poppet including a first land circumferentially dimensioned to engage the bore, wherein the first land is coupled to a first shaft and a second shaft, and an outer poppet longitudinally distanced from the first land and including a longitudinal channel dimensioned to receive a portion of the second shaft of the inner poppet, and a poppet cap, wherein the outer poppet and the portion of the inner poppet received within the outer poppet define a second land, the second land being longitudinally spaced from the first land and circumferentially dimensioned to engage the bore along a portion of its length, wherein the poppet cap is coupled to distal ends of the inner poppet and the outer poppet forming a distal terminus of the poppet assembly, the inner poppet and the outer poppet being movable by a selected amount with respect to one another in response to actuation of the poppet assembly such that the first and second lands (220, 222) each form substantially fluid-tight circumferential seals with the bore; wherein, in the closed position, a first substantially fluid-tight circumferential seal formed between the first land and the bore inhibits fluid flow between the first and second ports (1, 2), and wherein, in the open position, the first substantially fluid-tight circumferential seal allows fluid flow between the first and second ports (1, 2); and wherein, in the closed position, a second substantially fluid-tight circumferential seal formed between the second land and the bore inhibits fluid flow between the third and fourth ports (3, 4), and wherein, in the open position, the second substantially fluid-tight circumferential seal allows fluid flow between the third and fourth ports (3, 4). a valve body including a longitudinal bore extending therethrough between first and second longitudinally opposed ends (202p, 202d); a first port, a second port, a third port and a fourth port extending through the valve body and configured for fluid communication with the bore; and a poppet assembly longitudinally slidable within the bore between an open position and a closed position in response to an actuating force, the poppet assembly including an inner poppet including a first land circumferentially dimensioned to engage the bore, wherein the first land is coupled to a first shaft and a second shaft, and an outer poppet longitudinally distanced from the first land and including a longitudinal channel dimensioned to receive a portion of the second shaft of the inner poppet, and a poppet cap, wherein the outer poppet and the portion of the inner poppet received within the outer poppet define a second land, the second land being longitudinally spaced from the first land and circumferentially dimensioned to engage the bore along a portion of its length, wherein the poppet cap is coupled to distal ends of the inner poppet and the outer poppet forming a distal terminus of the poppet assembly, the inner poppet and the outer poppet being movable by a selected amount with respect to one another in response to actuation of the poppet assembly such that the first and second lands (220, 222) each form substantially fluid-tight circumferential seals with the bore; an inner poppet including a first land circumferentially dimensioned to engage the bore, wherein the first land is coupled to a first shaft and a second shaft, and an outer poppet longitudinally distanced from the first land and including a longitudinal channel dimensioned to receive a portion of the second shaft of the inner poppet, and a poppet cap, wherein the outer poppet and the portion of the inner poppet received within the outer poppet define a second land, the second land being longitudinally spaced from the first land and circumferentially dimensioned to engage the bore along a portion of its length, wherein the poppet cap is coupled to distal ends of the inner poppet and the outer poppet forming a distal terminus of the poppet assembly, the inner poppet and the outer poppet being movable by a selected amount with respect to one another in response to actuation of the poppet assembly such that the first and second lands (220, 222) each form substantially fluid-tight circumferential seals with the bore; wherein, in the closed position, a first substantially fluid-tight circumferential seal formed between the first land and the bore inhibits fluid flow between the first and second ports (1, 2), and wherein, in the open position, the first substantially fluid-tight circumferential seal allows fluid flow between the first and second ports (1, 2); and wherein, in the closed position, a second substantially fluid-tight circumferential seal formed between the second land and the bore inhibits fluid flow between the third and fourth ports (3, 4), and wherein, in the open position, the second substantially fluid-tight circumferential seal allows fluid flow between the third and fourth ports (3, 4).