Nitrogen sealing gas shut-off valve

Abstract

The invention discloses a nitrogen sealing gas shut-off valve, comprising a valve body, two valve plates and a plate supporting mechanism, wherein the two valve plates are arranged in a valve cavity corresponding to an inlet and an outlet; and the plate supporting mechanism is used for driving the two valve plates to close and open. A nitrogen inlet and a gas discharging port communicated with the valve cavity are mounted on the wall of the valve body; a track is horizontally arranged, vertical to the flowing direction of the medium, on the top wall or the bottom wall of the valve cavity; the two valve plates are connected with lifting wheels or rolling wheels via a connecting element, wherein the lifting wheels or the rolling wheels are mounted in the track; the connecting element is provided with a nut which is matched with a screw rod of a moving plate; the screw rod of the moving plate extends out of the valve cavity in a sealing mode and is in transmission connection with an electrical device of the moving plate; a connection rod plate supporting mechanism is mounted between the two valve plates; and a valve plate opening and closing screw rod is connected with an electrical executing device via a clutch. The nitrogen sealing gas shut-off valve is not limited by the mounting mode, and is small in mounting space; when in use, the waste gas (nitrogen) separated from the power workshop is used as the protective gas so that the water source is saved and the gas seal function is implemented.

Description

technical field [0001] The invention relates to a gas cut-off valve, in particular to a nitrogen-tight gas cut-off valve. Background technique [0002] Gas cut-off valves are widely used in metallurgy, municipal engineering, chemical industry and other gas and flue gas system pipelines and blast furnace gas power generation projects. At present, most of the existing gas shut-off valves are water-sealed gas shut-off valves, such as Figure 4 As shown, a wedge is used to push the valve plate for sealing. If the design of the wedge is unreasonable, the locking phenomenon will easily occur. When the valve is closed, the friction torque of the wedge will be large, and the valve body and the screw rod will be easily deformed due to the uneven axial force on the valve plate when the plate is braced. The above-mentioned water-sealed gas cut-off valve can only be installed vertically and takes up a lot of space. The installation height of the rising rod gas shut-off valve is 4.5 ti...

AI Technical Summary

Problems solved by technology

In order to prevent rust, the wedge, valve plate, screw rod and other components need to be made of stainless steel, and the manufacturing cost is high

At the same time, the water-sealed gas shut-off valve uses pure water. After one use, the water contains tar dust and other substances, which must be purified before reuse, which not only seriously corrodes the valve body but also wastes water resources.

When the temperature of the pipeline drops to freezing point, the water in the valve cavity freezes and the valve cannot be opened, which affects the normal use of the valve.

When the sealing ring of the valve plate is damaged, the sealing water enters the pipeline, which directly affects the transmission of combustible gas

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