Gate valve

Abstract

The invention discloses a gate valve with a good airtightness effect. Springs arranged between a traditional left valve plate and a traditional right valve plate are replaced by elastic metal rings, and therefore the defect that the left valve plate and the right valve plate get loose due to the fact that the springs lose efficacy after long-time use can be effectively overcome. Due to the facts that the elastic metal rings abut against the inner walls of accommodating cavities and open upwards, it is guaranteed that the elastic metal rings can exert pressure in the axis direction of a flow channel all the time, and the problem that airtightness is not enough due to abrasion of a valve seat or a sealing face is solved due to the fact that elastic force is exerted on the left valve plate and the right valve plate continuously. Moreover, a valve plate sleeve and a clamping sleeve are used for limiting and fixing the left valve plate and the right valve plate, the fixing mode is simple and reliable, and compared with a traditional gate valve, the airtightness is good, and the service life is long.

Description

technical field [0001] The invention relates to the technical field of valves, in particular to a gate valve. Background technique [0002] Gate valve is currently the most important type of valve, which is widely used in the circulation and cut-off of liquid, gas, dust and other media. Usually, the gate valve includes a valve body, and the lower part of the valve body has a feed port and a discharge port, and the left end of the feed port and the right end of the discharge port both have sealing surfaces, and the dynamic sealing fit between the two sealing surfaces is equipped with an upper and lower A valve plate that moves and does not rotate. At the same time, a valve stem is connected to the top of the valve plate, and a handle is connected to the top of the valve stem through a screw nut mechanism. After the handle is rotated, the screw nut mechanism drives the valve stem to move up and down, and then the valve plate moves up and down to seal or open the two sealing ...

AI Technical Summary

Problems solved by technology

However, even after the above-mentioned improvements are adopted, the gate valve still has the following defects: the valve plate will be worn after a long period of use, so that the inclination of the valve plate and / or the sealing slope changes, and then the sealing effect is greatly reduced. In the prior art, a double-disc gate valve has also appeared. The spring conflict between the two valve discs realizes the sealing between the valve disc and the valve seat. However, the elastic force of the spring will gradually disappear with the passage of time, which will also cause the valve disc to The seal between the seat and the valve is unstable

Images