Valve buffer

Abstract

The invention relates to a valve buffer. When the valve buffer is used and a valve is opened or closed, a valve disc is rotated to drive a connecting rod to sway, and a piston is driven to relatively move in a cylinder body by the connecting rod. At the early stage that the valve is closed, the valve disc is far from an adjacent area of a valve seat, the piston is moved to the left in a large inner cavity of the cylinder body, and left oil can flow to the right side, so as to implement quick closing; and at the final stage that the valve is closed, the valve disc is positioned in the adjacent area of the valve seat, the piston enters a small inner cavity, and the left oil can flow to the right side, so as to implement buffering closing. At the early stage that the valve is opened, and the valve disc is positioned in the adjacent area of the valve seat, the piston is moved to the right, so that on one hand, right oil can flow to the right side through a small circular channel, and on the other hand, the right oil can also flow through the left side of a check valve, so as to implement quick opening; and at the final stage that the valve is opened, the valve disc is far from the adjacent area of the valve seat, the piston is moved to the right in the large inner cavity of the cylinder body, and the right oil can flow to the left side through a large circular channel, so as to implement quick opening.

Description

technical field [0001] The invention relates to a hydraulic buffer, especially a valve buffer. Background technique [0002] At present, pipeline transportation is widely used in electric power, petroleum, chemical industry, steel and other fields, and the medium transported by pipeline includes liquid and gas. It is inevitable to use valves in pipeline transportation. When the valve is opened gradually from the closed state, the conveying medium in the pipeline will move downward through the valve. If the valve is opened too fast, the medium passing through the valve will flow downward rapidly. It is easy to produce water hammer or air hammer phenomenon, causing pipeline rupture and equipment damage; similarly, the valve is gradually closed from the open state, and the medium originally flowing in the pipeline will gradually slow down until it stops flowing. If the valve is closed too fast On the one hand, due to the combination of kinetic energy and hydraulic power posses...

AI Technical Summary

Problems solved by technology

It is inevitable to use valves in pipeline transportation. When the valve is opened gradually from the closed state, the conveying medium in the pipeline will move downward through the valve. If the valve is opened too fast, the medium passing through the valve will flow downward rapidly. It is easy to produce water hammer or air hammer phenomenon, causing pipeline rupture and equipment damage; similarly, the valve is gradually closed from the open state, and the medium originally flowing in the pipeline will gradually slow down until it stops flowing. If the valve is closed too fast On the one hand, due to the combination of kinetic energy and hydraulic power possessed by the excessively fast movement speed of the valve disc, the valve disc will generate a large impact force on the valve seat, which will cause the valve to be easily damaged and affect the service life of the valve. On the other hand, If the originally fast-flowing medium stops suddenly, its kinetic energy will generate excessive pressure on the pipeline and equipment, and also cause water hammer or air hammer, causing pipeline rupture and equipment damage

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