Abstract: A spring free gate valve includes a power source connected with a shaft; a valve body having the power source at one end thereof with the shaft inserted into the valve body, wherein the valve body has a valve bore, with two lateral sides therein provided with a guide rail, respectively; a drive member connected with the shaft and driving two guide portions of a valve plate to move along the guide rails. When the guide portions move to one end of the guide rails, the valve plate is fixed and in alignment with the valve bore. The drive member continues to move along with a trip of the shaft, and the valve plate is driven to move along a radial direction of the shaft to seal the valve bore. Therefore, abnormal operation caused by resiliency fatigue of spring is resolved.

Abstract: A gate valve with secure sealing mechanism includes a main body having a valve opening, a driver disposed on the main body, a sliding seat slidingly disposed in the main body, a swing arm, and a valve member. Two ends of the swing arm are connected to the driver and the sliding seat, respectively, whereby the driver drives the swing arm to move circularly between a first and second position, thereby triggering the sliding seat to slide. When the swing arm is at the first or second position, the swing arm is biased against the route direction of the sliding seat. The valve member is disposed on the sliding seat for moving in parallel or vertical to the valve opening, thereby preventing the sliding seat from swaying when the swing arm is at the first or second locking position.

Abstract: A gate valve with secure sealing mechanism includes a main body having a valve opening, a driver disposed on the main body, a sliding seat slidingly disposed in the main body, a swing arm, and a valve member. Two ends of the swing arm are connected to the driver and the sliding seat, respectively, whereby the driver drives the swing arm to move circularly between a first and second position, thereby triggering the sliding seat to slide. When the swing arm is at the first or second position, the swing arm is biased against the route direction of the sliding seat. The valve member is disposed on the sliding seat for moving in parallel or vertical to the valve opening, thereby preventing the sliding seat from swaying when the swing arm is at the first or second locking position.

Abstract: A gate valve with linkage structure includes at least a power cylinder, a valve body having a valve opening; a gate assembly in the valve body, having a main gate board and an air-tight gate board neighborly disposed, and connected with one end of the air-tight gate board by at least one parallel linkage; and at least a press bar, with one end pivotally connected to the air-tight gate board and the other end extending to form a press end. A linkage bar is pivotally connected to the press bar and also pivotally connected to the main gate board. Therefore, the gate assembly is driven to seal the valve opening; the air-tight gate board moves away from the main gate board with the linkage function; a sealing force is generated to keep the air-tightness between the air-tight gate board and the valve opening.

Abstract: A gate valve with secure sealing mechanism includes a main body having a valve opening, a driver disposed on the main body, a sliding seat slidingly disposed in the main body, a swing arm, and a valve member. Therein, two ends of the swing arm are connected to the driver and the sliding seat, respectively, whereby the driver drives the swing arm to move circularly between a first and second position, thereby triggering the sliding seat to slide. When the swing arm is at the first or second position, the swing arm is biased against the route direction of the sliding seat. The valve member is disposed on the sliding seat for moving in parallel or vertical to the valve opening, thereby preventing the sliding seat from swaying when the swing arm is at the first or second locking position.

Abstract: A gate valve with secure sealing mechanism includes a main body having a valve opening, a driver disposed on the main body, a sliding seat slidingly disposed in the main body, a swing arm, and a valve member. Therein, two ends of the swing arm are connected to the driver and the sliding seat, respectively, whereby the driver drives the swing arm to move circularly between a first and second position, thereby triggering the sliding seat to slide. When the swing arm is at the first or second position, the swing arm is biased against the route direction of the sliding seat. The valve member is disposed on the sliding seat for moving in parallel or vertical to the valve opening, thereby preventing the sliding seat from swaying when the swing arm is at the first or second locking position.

Abstract: A gate valve with linkage structure includes at least a power cylinder, a valve body having a valve opening; a gate assembly in the valve body, having a main gate board and an air-tight gate board neighborly disposed, and connected with one end of the air-tight gate board by at least one parallel linkage; and at least a press bar, with one end pivotally connected to the air-tight gate board and the other end extending to form a press end. A linkage bar is pivotally connected to the press bar and also pivotally connected to the main gate board. Therefore, the gate assembly is driven to seal the valve opening; the air-tight gate board moves away from the main gate board with the linkage function; a sealing force is generated to keep the air-tightness between the air-tight gate board and the valve opening.