Subsea control valve for controlling the supply of hydraulic fluid to a subsea fluid-actuated device, thereby controlling the fluid-actuated device between an initial state and an actuated state, comprising: - a housing with an input fluid line bore connectable to a input fluid system, a return fluid line bore connectable to a return fluid system and an actuator fluid line bore connectable to the fluid-actuated device; - a ball valve member with a through bore, pivotably connected within the housing between the input fluid line bore, the return fluid line bore and the actuator fluid line bore, the ball valve member having a first and a second position; where the actuator fluid line bore and the return fluid line bore are connected to each other via the through bore when the ball valve member is in its first position, thereby allowing fluid to be returned from the fluid-actuated device to the return fluid system; where the input fluid line bore and the actuator fluid line bore are connected to each other via the through bore when the ball valve member is in its second position, thereby allowing fluid to flow from the input fluid system to the fluid-actuated device; where a longitudinal axis of the actuator fluid line bore is coinciding with the rotation axis of the ball valve member; where the ball valve member comprises a supporting element protruding into the actuator fluid line of the housing; - the valve comprises an input side ball seat and a return side ball seat for supporting the ball valve member within the housing, where the input fluid line is provided through the input side ball seat and the return fluid line is provided through the return side ball seat; where the valve comprises an input side end element and a return side end element connected to the housing; where an axially protruding section of the input side ball seat is sealed towards the input side end element by means of a input side seal; where an axially protruding section of the return side ball seat is sealed towards the return side end element by means of a return side seal; characterized in that the input side ball seat comprises an input side inner piston surface exposed to the fluid pressure of the input fluid line and an input side outer piston surface exposed to the fluid pressure of the actuator fluid line; where the return side ball seat comprises a return side inner piston surface exposed to the fluid pressure of the return fluid line and a return side outer piston surface exposed to the fluid pressure of the actuator fluid line; where a first ball valve seal having a first radius is provided between the input side ball seat and the ball valve member; where a second ball valve seal having a second radius is provided between the return side ball seat and the ball valve member; where the radius of the first ball valve seal is smaller than a radius of the second ball valve seal. - a housing with an input fluid line bore connectable to a input fluid system, a return fluid line bore connectable to a return fluid system and an actuator fluid line bore connectable to the fluid-actuated device; - a ball valve member with a through bore, pivotably connected within the housing between the input fluid line bore, the return fluid line bore and the actuator fluid line bore, the ball valve member having a first and a second position; - the valve comprises an input side ball seat and a return side ball seat for supporting the ball valve member within the housing, where the input fluid line is provided through the input side ball seat and the return fluid line is provided through the return side ball seat;