Through type rapid cut-off valve

Abstract

The invention discloses a through type rapid cut-off valve for emergently cutting off a pipeline, which comprises a valve body, a valve core and a valve rod, wherein a liquid inlet and a liquid outlet are formed at the two ends of the valve body respectively; the valve rod is fixed on the valve body; the liquid inlet end of a valve cavity is provided with a valve seat; the front end of the valve core is provided with a conical surface matched with the valve seat; a piston is fixed at the rear end of the valve core; a cylinder body matched with the piston of the valve core is arranged in the valve cavity and is fixed on the valve body through a connecting rod; the symmetric center of the cylinder body is coincided with the symmetric center of a flow passage of the valve cavity; the valve rod is fixed at the rear end of the cylinder body; a swing arm is fixed on the valve rod; and the other end of the swing arm is hinged with the piston of the valve core through a connecting rod. A valve core opening and closing mechanism has a piston structure, so that the pipeline can be extremely quickly cut off; and the conical surface at the front end of the valve core has a good flow distribution effect and low flow resistance, so that the valve can be stably operated and turbulence and vibration are avoided in the medium circulation process.

Description

technical field

[0001] The invention relates to a cut-off valve for emergency cut-off of gas supply and liquid supply pipelines, in particular to a straight-through quick cut-off valve. Background technique

[0002] Shut-off valves are usually installed on the transmission pipelines used in the fields of oil, natural gas, water supply and drainage, just to cut off the pipeline and stop the fluid supply in case of emergency. This cut-off valve must have small flow resistance and close quickly. Currently commonly used cut-off valves are generally divided into two driving forms, such as ball valves, gate valves, butterfly valves, etc., which mainly use threaded rising stem or 90°rotating stem drive form, which wastes time when opening and closing the valve in an emergency. At the same time, except for full flow valves such as ball valves, the fluid is more or less turbulent, and there will be vibrations and other phenomena. Contents of the invention

[0003] The purpose of ...

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