A foot support system (100, 6000) for an article of footwear (1000, 2000, 3000, 4000, 5000), comprising: a first footwear component (1002, 1004, 1010); a first fluid-filled container or bladder support engaged with the first footwear component, wherein the first fluid-filled container or bladder support includes a gas at a first pressure; a second fluid-filled container or bladder support engaged with the first footwear component or a second footwear component (1002, 1004, 1010), wherein the second fluid-filled container or bladder support includes a gas at a second pressure; a first fluid transfer line placing the first fluid-filled container or bladder support in fluid-communication with the second fluid-filled container or bladder support; a valve (140, 540) located in or connected to the first fluid transfer line, wherein the valve includes: a fixed valve part (142, 560) including a valve component seating area (144, 560S), and a movable valve part (146, 580) including a portion movable into and out of contact with the valve component seating area (144, 560S), wherein the movable valve part (146, 580) maintains a sealed connection with a wall of the first fluid transfer line; and a control system (160, 500, 550) configured to change the valve (140, 540) between an open condition and a closed condition, wherein when the second pressure is greater than the first pressure, the control system: (a) holds the valve in the closed condition and inhibits gas from moving from the second fluid-filled container or bladder support, through the first fluid transfer line and valve (140, 540), and into the first fluid-filled container or bladder support or (b) is selectively controllable to move the valve (140, 540) to the open condition and allow fluid to move from the second fluid-filled container or bladder support, through the first fluid transfer line and valve (140, 540), and into the first fluid-filled container or bladder support, and wherein when the first pressure is greater than the second pressure by at least a first predetermined amount, gas from the first fluid-filled container or bladder support: (a) causes the movable valve part (146, 580) to move out of contact with the valve component seating area (144, 560S) and (b) moves from the first fluid-filled container or bladder support, through the valve (140, 540) and first fluid transfer line, and into the second fluid-filled container or bladder support. a first footwear component (1002, 1004, 1010); a first fluid-filled container or bladder support engaged with the first footwear component, wherein the first fluid-filled container or bladder support includes a gas at a first pressure; a second fluid-filled container or bladder support engaged with the first footwear component or a second footwear component (1002, 1004, 1010), wherein the second fluid-filled container or bladder support includes a gas at a second pressure; a first fluid transfer line placing the first fluid-filled container or bladder support in fluid-communication with the second fluid-filled container or bladder support; a valve (140, 540) located in or connected to the first fluid transfer line, wherein the valve includes: a fixed valve part (142, 560) including a valve component seating area (144, 560S), and a movable valve part (146, 580) including a portion movable into and out of contact with the valve component seating area (144, 560S), wherein the movable valve part (146, 580) maintains a sealed connection with a wall of the first fluid transfer line; and a fixed valve part (142, 560) including a valve component seating area (144, 560S), and a movable valve part (146, 580) including a portion movable into and out of contact with the valve component seating area (144, 560S), wherein the movable valve part (146, 580) maintains a sealed connection with a wall of the first fluid transfer line; and a control system (160, 500, 550) configured to change the valve (140, 540) between an open condition and a closed condition, wherein when the second pressure is greater than the first pressure, the control system: (a) holds the valve in the closed condition and inhibits gas from moving from the second fluid-filled container or bladder support, through the first fluid transfer line and valve (140, 540), and into the first fluid-filled container or bladder support or (b) is selectively controllable to move the valve (140, 540) to the open condition and allow fluid to move from the second fluid-filled container or bladder support, through the first fluid transfer line and valve (140, 540), and into the first fluid-filled container or bladder support, and wherein when the first pressure is greater than the second pressure by at least a first predetermined amount, gas from the first fluid-filled container or bladder support: (a) causes the movable valve part (146, 580) to move out of contact with the valve component seating area (144, 560S) and (b) moves from the first fluid-filled container or bladder support, through the valve (140, 540) and first fluid transfer line, and into the second fluid-filled container or bladder support.