A valve with a hinged valve core, comprising a valve body (1, 61), a valve core (4, 64), an operating mechanism (2, 62), a motion-transferring device and a locking device (42, 226; 723), said valve body is a housing, wherein the housing is formed with an operating hole (1d, 61d) used to partially accommodate the operating mechanism and a channel (1a, 61a) having an inlet and an outlet is formed in the housing, wherein: the valve core is connected with the valve body through a hinge (1g, 1h, 411, 412; 61g, 61h, 6411, 6412), and the operating mechanism is used to operate the valve core to be rotated around the central axis of the hinge to open/close the valve, wherein the operating mechanism comprises a handle (21; 621) and an operating member (22; 622), wherein the operating member is rotatably held on the valve body; and the motion-transferring device is used to transfer actions on the operating mechanism to the valve core, and when the valve is closed or opened, the valve core is locked on the valve body through the locking device, characterised in that guiding grooves are provided over the channel of the valve body; the bottom of the operating member is provided with a gear and a locking hook; the motion-transferring device is a plate-shaped member having a plate-shaped body, wherein a hole is provided at the middle portion of the plate-shaped body and a rack is provided one sidewall surrounding the hole, the rack being used to be engaged with the gear provided on the operating member to achieve motion-transferring between the operating member and the motion-transferring mechanism; one end of the plate-shaped body is provided with a driving rod; and one side of the plate-shaped body is provided with sliding rails, wherein the sliding rails are engaged with the guiding grooves provided on the valve body, so that the motion-transferring mechanism is movable in the valve body along the guiding grooves; and the valve core has a disc-shaped body, wherein the outer periphery of the body is integrally provided with the hinge shafts; one side of the body is a smooth surface, and the other side is provided with a locking pole; wherein a sliding slot is provided between the locking pole and the body, and wherein the locking pole is used to be engaged with the locking hook of the motion-transferring device, and the sliding slot is used to be engaged with the driving rod of the motion-transferring device to open/close the valve. the valve core is connected with the valve body through a hinge (1g, 1h, 411, 412; 61g, 61h, 6411, 6412), and the operating mechanism is used to operate the valve core to be rotated around the central axis of the hinge to open/close the valve, wherein the operating mechanism comprises a handle (21; 621) and an operating member (22; 622), wherein the operating member is rotatably held on the valve body; and the motion-transferring device is used to transfer actions on the operating mechanism to the valve core, and when the valve is closed or opened, the valve core is locked on the valve body through the locking device, characterised in that guiding grooves are provided over the channel of the valve body; the bottom of the operating member is provided with a gear and a locking hook; the motion-transferring device is a plate-shaped member having a plate-shaped body, wherein a hole is provided at the middle portion of the plate-shaped body and a rack is provided one sidewall surrounding the hole, the rack being used to be engaged with the gear provided on the operating member to achieve motion-transferring between the operating member and the motion-transferring mechanism; one end of the plate-shaped body is provided with a driving rod; and one side of the plate-shaped body is provided with sliding rails, wherein the sliding rails are engaged with the guiding grooves provided on the valve body, so that the motion-transferring mechanism is movable in the valve body along the guiding grooves; and the valve core has a disc-shaped body, wherein the outer periphery of the body is integrally provided with the hinge shafts; one side of the body is a smooth surface, and the other side is provided with a locking pole; wherein a sliding slot is provided between the locking pole and the body, and wherein the locking pole is used to be engaged with the locking hook of the motion-transferring device, and the sliding slot is used to be engaged with the driving rod of the motion-transferring device to open/close the valve.