Emergent opening/closing gate valve

Abstract

The invention discloses an emergent opening / closing gate valve. The emergent opening / closing gate valve is characterized by comprising a valve body, a valve cover and a valve rod, wherein one end, positioned in the valve body, of the valve rod is provided with a valve plate for opening / closing; the valve rod is provided with an operation shaft perpendicular to the valve rod; the operation shaft is connected with a gear through a key; the valve rod is provided with a rack engaged with the gear; a channel for lifting the valve rod is formed in the valve cover; the whole valve rod is wrapped by the valve cover; an opening / closing mode of the valve plate abandons a traditional mode of spirally screwing the valve rod; a gear-rack transmission mode is adopted; the operation shaft rotates; then, the valve rod is driven to vertically lift by a small gear and the rack on the valve rod to realize the opening / closing; the transmission structure is large in transmission torque and quick in transmission speed, can realize quick opening / closing of the valve, is simpler, labor-saved and quicker in operation, and is suitable for specific places; and the whole valve rod is wrapped and sealed by the valve cover to prevent from easily being damaged under bad environments, so that the service life is prolonged.

Description

technical field [0001] The invention relates to the field of valves, more specifically, it relates to an emergency opening and closing gate valve. Background technique [0002] Valves are the control components in the fluid conveying system. They have the functions of cut-off, adjustment, flow diversion, reverse flow prevention, pressure stabilization, flow diversion or overflow pressure relief. Valves, ball valves and butterfly valves, etc., are widely used in natural gas long-distance pipelines, metallurgy, hydropower, thermal power, urban water supply and drainage, farmland drainage and irrigation and other industries, and are suitable for natural gas, coal gas, steam, air, water, etc. In changing the pipeline system, it is used to cut off or connect the medium. [0003] The gate valve is a widely used control valve. The opening and closing of the existing gate valves are realized by screwing the valve stem to drive the gate plate to rise and fall. Therefore, the speed ...

AI Technical Summary

Problems solved by technology

[0003] The gate valve is a widely used control valve. The opening and closing of the existing gate valves are realized by screwing the valve stem to drive the gate plate to rise and fall. Therefore, the speed of opening and closing is very slow. For some occasions that require the valve to be opened or closed quickly, especially the occasions involving safety, the existing threaded screw-opening gate valve is difficult to adapt and meet the use requirements.

[0004] And usually the connection between the valve stem and the valve body is filled with packing to achieve sealing. Some parts of the valve stem are exposed to the outside, and are prone to failure and damage in some harsh environments. , it is easy to drive the packing during the operation of the valve stem, and sometimes the packing will be taken out, which will affect the sealing and the stability of the valve stem. Since the packing will be lost, multi-layer packing layers are usually set to ensure long-term maintenance. normal operation, thus greatly increasing the overall weight of the gate valve

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