A new gate valve

Abstract

The invention discloses a novel sluice valve with a good sealing effect. Compared with a conventional sluice valve, the novel sluice valve disclosed by the invention is good in sealing performance and long in service life. An upper valve plate set is connected to a lower valve plate set by connecting pieces so as to ensure that when a valve rod moves up and down, an upper sealing surface and a lower sealing surface are maintained at the best state; although the upper sealing surface and the lowing sealing surface are different in abrasion loss, the upper sealing surface and the lowing sealing surface do not interfere each other; the abrasion losses of the upper sealing surface and the lower sealing surface are compensated by respective elastic metal rings, and therefore, the upper sealing surface and the lower sealing surface have the best sealing effect. Springs between conventional valve plates are replaced by the elastic metal rings so as to effectively overcome a phenomenon that after the springs become invalid due to long-term usage, loosening occurs between the two valve plates.

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 traditional single-plate gate valve includes a valve body, 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 There is a valve plate that can move up and down without rotation. 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 se...

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 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 valve seat and the valve seat is unstable. In addition, the setting of the wedge-shaped valve plate has caused another problem, that is, the diameters of the upper and lower ends of the wedge-shaped valve plate are not the same. Or the variation of the inclination of the upper and lower ends of the sealing slope is not the same, and because the existing double valve plate gate valve provides compensation through the same spring between the two valve plates, there will inevitably be a gap between the two sealing surfaces. Insufficient compensation occurs, resulting in the sealing can not meet the requirements

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