A kind of sealing structure for gate valve

Abstract

The invention discloses a closing structure for a gate valve. The closing structure comprises a valve rod, a valve seat, a piston, a rotary arm and a gate plate, wherein the valve rod is rotationally arranged on the valve body; the valve seat is fixedly arranged in the valve body, a containing cavity and a piston cavity are arranged in the valve seat, and the piston cavity is communicated with the containing cavity; the piston is arranged in the piston cavity in a sliding mode, and a sealing plate is fixedly arranged on the front end face of the piston; the rotary arm is mounted in the containing cavity in a pivoted mode and comprises a pressing end and a rotary arm end face, the pressing end is located in the piston cavity and abuts against the rear end face of the piston, and the rotary arm end face is located in an inner cavity of the valve seat; the upper end of the gate plate is connected with the end of the valve rod, the gate plate is driven by the valve rod to move up and down in the inner cavity of the valve seat, the lower end of the gate plate is provided with a gate plate end locking face, the gate plate end locking face is matched with the rotary arm end face, and the side face of the gate plate is matched with the sealing plate. The closing structure has the advantages of being capable of closing the gate valve automatically and good in sealing effect.

Description

technical field [0001] The invention relates to the field of valve structures, in particular to a sealing structure for gate valves. Background technique [0002] At present, the gate valve seal often relies on the forced extrusion of the valve core to seal. During use, it is easy to damage the surface of the valve core and cause the seal to fail due to repeated friction. service life. [0003] Chinese patent CN201320157254.5 discloses a closed cast steel gate valve. The gate valve includes a valve body, a valve core, a valve stem and a hand wheel. The valve body is a T-shaped hollow pipe with an integrated structure. The valve body One end is provided with a bonnet, and the bonnet is covered with a double-rib bracket, which cooperates with the bonnet to form a closed structure for the valve body port, and the bonnet and the valve body are interlocked with each other. The pressing mechanism on the bracket realizes the closed connection between the bonnet and the valve body...

AI Technical Summary

Problems solved by technology

[0005] In the above two patents, slope compensation is used to compensate for the wear of the spool during use, but the wear of the spool is a slow process. After repeated use, even the slope will cause the contact surface to be lower than normal due to wear. If the contact surface is forced to be sealed at this time, the normal surface will be squeezed and deformed, which will aggravate the failure of the valve core

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