Hinged valve

An hinged valve comprising a valve body, a valve stem, a valve disc, an actuator and a sliding member, wherein the valve body is a housing which is provided with a valve stem hole for partially accommodating the valve stem, and the valve body has a passage with an inlet and an outlet, the valve disc is connected to the valve body through a hinge so that the valve disc is rotatable around a rotation axis of the hinge, and the valve disc is provided with a locking post, a bottom end of the valve stem is provided with a locking hook, wherein the actuator is provided with a pushing-out contour and a pulling-back contour and is connected with the valve stem to form a relatively stationary assembly capable of moving synchronously;

• the sliding member is rotatably connected to the valve disc and is provided with an opening guiding post and a pulling-back guiding post that respectively cooperate with the pushing-out contour and the pulling-back contour, wherein
• the locking post is provided with a locking boss, and the locking hook is provided with a locking-ledge, wherein the pushing-out contour cooperates with the opening guiding post during the valve opening, so that a rotational movement of the valve stem is transmitted to the valve disc through the actuator via the sliding member and is converted into the movement that drives the valve disc to rotate around the rotation axis of the hinge to open the valve;
• the pulling-back contour cooperates with the pulling-back guiding post during the valve closing, so that the rotational movement of the valve stem is transmitted to the valve disc through the actuator via the sliding member and is converted into the movement that drives the valve disc to rotate around the rotation axis of the hinge to close the valve, when the valve is in the closed state, the valve disc is locked to the valve body by the locking hook and the locking post, and the locking-ledge on the locking hook and the locking boss on the locking post engage with each other;
• the locking boss is located on an upper portion of the locking post and protrudes outward relative to the locking post, and the locking-ledge extends from a lower portion of the locking hook transversely to the locking hook;
• and
• the valve body has a flange located at one end of the valve body, the valve body is further provided with a reinforcing protrusion radially extending outward along the valve body, and a force-relieving groove is provided between the reinforcing protrusion and the flange.