Gear-transmission zero-leakage flat gate valve

Abstract

The invention relates to a gear-transmission zero-leakage flat gate valve which comprises valve bodies, valve seats, a gate plate and a handle. The valve bodies are composed of the left valve body, the right valve body and the middle valve body. The valve seats are mounted in a channel of the left valve body and a channel of the right valve body respectively. Mainly, the outer circumferential face of the gate plate and the circular wall of an inner cavity of the middle valve body are connected in a movable fit mode, a fan-shaped through hole is formed in the plane of the gate plate, and a sector gear is arranged on the inner cambered surface of the fan-shaped through hole. A gear shaft is mounted on the left valve body and the right valve body, the axis of the gear shaft is perpendicular to the plane of the gate plate, and a gear of the gear shaft is engaged with the sector gear on the gate plate. A flow guide hole is formed in the plane of the gate plate, and the circle center of the flow guide hole is located on an arc with the center of the gear shaft as the circle center and the perpendicular line between the center of the gear shaft and the central line of the valve channels as the radius. The handle rotates to drive the gate plate to rotate in a valve cavity to open and close the valve, and the size and the weight of the valve are reduced; meanwhile, the problem that padding leaks due to moving abrasion of a valve rod in the prior art is solved, and the middle cavity sealing performance is improved.

Description

Technical field [0001] The invention belongs to the field of valves, and particularly relates to a flat gate valve. Background technique [0002] A flat gate valve is generally composed of a valve body, a valve cover, a valve seat, a gate plate, and a valve stem. The valve seat is installed with the inlet and outlet channels of the valve body, and cooperates with the planes on both sides of the gate to seal each other. The gate is driven away from the seat by the valve stem. The sealing surface may cooperate with the valve seat to seal to realize the opening or closing operation of the gate. One of its shortcomings is: when the valve is opened, the valve stem drives the gate plate upward and is stored in the inner cavity of the valve cover. The valve has a large volume, heavy weight, and large installation space; the second disadvantage is that the valve stem and the valve cover are sealed The packing is sealed, and the lifting of the valve stem causes wear to the packing, and t...

AI Technical Summary

Problems solved by technology

One of its disadvantages is: when the valve is opened, the valve stem drives the gate plate to lift up and store in the inner cavity of the bonnet, the valve is large in size, heavy in weight, and has a large installation space; Packing seal, the lifting of the valve stem will cause wear to the sealing packing, and the sealing reliability is poor

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