High-reliability elastic soft seal gate valve

Abstract

A high-reliability elastic soft-sealed gate valve, including a hand wheel, a valve stem, a valve cover, a valve body and a valve plate. The two ends of the valve body channel are the medium inlet and outlet respectively. Pass through the bonnet to connect with the valve plate, and the top is connected with the hand wheel. The bottom wall of the valve body channel under the valve plate is provided with a slightly convex arc surface, and the bottom surface of the valve plate is provided with a concave hole for inserting the slightly convex arc surface. , the height of the slightly convex arc surface is 2-6mm. The bottom walls of the medium inlet and outlet are provided with arc-shaped conical surfaces, the small openings of the arc-shaped conical surfaces face outward, and the inclination angle α is 3°-8°, preferably 5°. When the valve plate moves down and closes, the slightly convex arc surface will be inserted into the concave hole to establish the lower support point, coupled with the upper support of the valve stem, so that the original suspended valve plate becomes a structure with support up and down, completely solving the original The soft-sealed gate valve has technical problems that the valve plate is prone to displacement, damage, short service life and affecting the sealing effect due to the lack of support at the lower part of the valve plate.

Description

technical field [0001] The invention relates to a valve, in particular to a high-reliability elastic soft-sealed gate valve. Background technique [0002] The opening and closing part of the gate valve is the valve plate, and the movement direction of the valve plate is perpendicular to the flow direction of the medium. The gate valve is generally used for full opening and full closing, and cannot be adjusted or throttled. The valve plate has two sealing surfaces. The most commonly used mode is that the two sealing surfaces of the valve plate are wedge-shaped, and the wedge angle varies with the valve parameters, usually 5°. The valve plate of the wedge gate valve can be made as a whole, and the sealing surface is inlaid with copper or different types of steel, which is called a rigid valve plate. This type of gate valve is called a metal hard-sealed gate valve, hereinafter referred to as a hard-sealed gate valve; The deformed valve plate is covered with different types of ...

AI Technical Summary

Problems solved by technology

Since the top of the valve plate of the soft-sealed gate valve is fixed and supported by the bonnet, valve stem, etc., when the valve plate is displaced, two problems will occur: one is to make the side of the valve plate and the upper part of the valve body channel form a shear force, Damage to the rubber of the valve plate shortens the service life of the gate valve. At the same time, the rust of the valve plate casting due to the damage of the valve plate rubber will also cause secondary pollution; secondly, because of displacement, the medium is easy to leak and affect the sealing effect of the gate valve. It is also difficult to achieve zero leakage if the gate valve torque continues to increase. At the same time, increasing the torque will cause the torque value to exceed the torque requirement specified in the gate valve standard

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