Double-disc wedge gate valve adopting composite spring connection

Abstract

A double-disc wedge gate valve adopting composite spring connection comprises a valve body, discs, a valve rod, a bearing gland, fasteners and other components, wherein the upper end of the valve rod is matched with sealing packing in a seal box at the upper part of a valve cover, extends out of a packing gland to be matched with a T-shaped nut on a bracket, is in transmission connection with the nut through threads and is connected with an actuating mechanism; double discs, namely, a left disc and a right disc are adopted and are obliquely arranged, the width of the upper part of a gap between the left disc and the right disc is larger than that of the lower part of the gap, springs are arranged between the left disc and the right disc for connection, a wedge cam with a wedging function is arranged between the left disc and the right disc, and the upper ends of the double discs, namely, the left disc and the right disc are nested together through an upper baffle. According to the double-disc wedge gate valve, spring connection is adopted, the distance between the sealing surfaces can be automatically adjusted, and the defect of absence of interchangeability of conventional products is overcome. Due to the adjusting performance of the springs, the phenomena of wedge failure frequently occurring to the conventional gate valves at the high temperature are reduced, the temperature change can be automatically adjusted through the springs, and the double-disc wedge gate valve is particularly suitable for being used as valves of a power station in the high-temperature environment.

Description

technical field [0001] The invention relates to an on-off valve for a flow medium, in particular to a spring-connected wedge-type self-pressure double-disc gate valve. Background technique [0002] With the rapid development of China's industry in recent years, valves have become more and more widely used in fluid transportation pipelines, and more and more attention has been paid to them; and in many valve control systems, gate valves are among the best used among many valves. This makes the technological update of gate valves more and more important. However, the gate valve used in the modern pipeline fluid transportation process has a solid contact between the gate sealing surface and the valve body sealing surface because the gate is integral or the left and right gates are fixed in an unadjustable integral form when assembled, resulting in a tight seal. The surface is easy to wear, and there is a lot of friction between the valve seat and the sealing surface when openi...

AI Technical Summary

Problems solved by technology

[0003] The invention provides a composite spring-connected wedge-type double-disc gate valve, which adopts spring connection, so that the distance between the sealing surfaces has an automatic adjustment function, which solves the defect of non-interchangeability of conventional products, and also because of the adjustment performance of the spring. The wedging phenomenon that often occurs in conventional gate valves at high temperatures is reduced, and the temperature change can be automatically adjusted by the spring, which is especially practical for power station valves in high temperature environments

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