Expansion gate valve

Abstract

The invention provides an expansion gate valve which comprises two gate plates. The two gate plates are matched to achieve expansion through two inclined faces. The expansion gate valve further comprises a rocker arm, a sliding block and two limiting plates. The two gate plates are arranged between the two limiting plates. The upper portion of the rocker arm is connected with the two gate plates through two rocker arm connecting threads respectively. The lower portion of the rocker arm is connected with the sliding block through a sliding block connecting thread. The sliding block is installed in the sliding grooves of the gate plates. According to the expansion gate valve, it can be effectively ensured that the gate plates expand in place in the opening and closing positions, the sliding block is in a rectangular shape, and therefore machining errors can be conveniently controlled; and the rectangular sliding block is more difficult to abrade than a common integral rocker and is replaceable, and later-stage maintenance of the valve is facilitated.

Description

technical field [0001] The invention relates to the technical field of gate valves, in particular to an expansion gate valve. Background technique [0002] In the current expansion mode of the expansion gate valve, there are various expansion devices, except that some small-diameter valves use spring devices. For large-diameter valves, some manufacturers use the expansion method of the side limit guide plate. This structure can only realize the full expansion of the gate at the fully closed position, and cannot expand at the fully open position to protect the sealing surface; some manufacturers use an integrated valve. Type side rocker expansion device, but this kind of side rocker has an irregular shape, which is highly dependent on the dimensional error of the part processing, and is prone to wear and other problems after long-term work, which will affect the expansion effect. Contents of the invention [0003] In order to overcome the defects of the existing one-piece ...

AI Technical Summary

Problems solved by technology

[0003] In order to overcome the defects of the existing one-piece side rocker expansion device, reduce the dependence on the machining size error of parts, and reduce the influence of wear and other problems on the expansion effect, the invention provides an expansion gate valve, which integrates the one-piece side rocker The rod becomes a rocker plus a slider structure, and the position of the slider is ensured by the gate and the limit structure on both sides. The gate does not expand, and the limit disappears when the final closing and opening positions occur, and the slider moves to cause expansion.

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