A high-tightness gate valve

Abstract

The present invention relates to the technical field of gate valves, and aims to provide a gate valve with high sealing performance, which includes a valve body, a valve stem and a gate; a fluid channel is arranged in the valve body, and a sealing groove is arranged under the gate in the fluid channel; The side wall of the gate is provided with a slot, and a sealing air bag made of rubber is arranged in the slot, and the sealing air bag is located in the sliding hole when the gate is closed; the lower end of the gate is provided with an adjustment air bag, and the adjustment The two ends of the air bag are respectively provided with air pipes corresponding to the two ends of the sealed air bag. When the valve stem drives the gate plate to cut off the fluid passage downward, the regulating airbag at the lower end of the gate plate squeezes in the sealing groove and shrinks and deforms, so that the internal air is squeezed and transported into the sealing airbag through the air pipe, so that the sealing airbag moves toward The outside of the slot expands and deforms, and the inflated sealing air bag is squeezed on the inner wall of the sliding hole to realize the sealing effect between the gate and the sliding hole, preventing the liquid in the fluid channel from entering the other side of the gate through the gap.

Description

technical field [0001] The invention relates to the technical field of gate valves, in particular to a high-tightness gate valve. Background technique [0002] The gate valve is a gate of the opening and closing part. The direction of movement of the gate is perpendicular to the direction of the fluid. The gate valve can only be fully opened and fully closed, and cannot be adjusted or throttled. [0003] At present, the Chinese patent document with the authorized announcement number CN207018555U in the prior art discloses a rising rod signal gate valve for fire protection, which includes a signal gate valve body, a fluid channel is arranged in the signal gate valve body along the axial direction, and a The main housing of the gate valve, the main housing of the gate valve is provided with an open cavity, the open cavity is connected with the fluid channel, and the lifting switch is slidingly connected in the opening cavity, and the lower part of the lifting switch is provide...

AI Technical Summary

Problems solved by technology

[0004] Although the upper end of the main housing of the gate valve is sealed by the sealing cover, it can only prevent the liquid from leaking out of the gate valve; when the gate moves downward to block the fluid channel, the upper lifting switch is still in the open cavity, while the lower locking part is in the open cavity. In the fluid channel, there will be a certain gap between the periphery of the gate and the connection between the open cavity and the fluid channel due to the need for sliding fit, so that the liquid in the gate valve can enter the open cavity from one side of the gate through the gap, and then pass through the gap. The gap enters the other side of the gate, affecting the partition effect

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