Two stage damping axial flow type check valve with adjustable closure time

Abstract

The invention relates to a two-phase damping axial flow type check valve which can adjust closing time. A valve seat is arranged on the inner front part of the valve body, a valve core is arranged in the valve body, the valve core is connected with a valve shaft, a damping cylinder body is arranged in the valve body, the inner front end of the valve body is provided with a sidewise pipe communicated with the valve body, a throttle valve is arranged in the sidewise pipe, the front end of the damping cylinder body is provided with a valve axial hole, and the rear end is provided with a liquid inlet and outlet hole, the inner cavity of the valve body is provided with a front inner cavity and a rear inner cavity with different sizes of the inside diameters, the inner cavity of the cylinder body is provided with a damping cylinder plug matched with the gap of the front inner cavity, the other end of the valve shaft is connected with the damping cylinder plug by the valve shaft hole, the damping cylinder plug is provided with a directional valve flowing forwards, and the distance between the front end of the cylinder cap and the valve core is the same as the distance in which the damping cylinder plug can move in the cylinder sleeve. The invention selects different structural parameters during design to adjust the closing time of the check valve in the two sections. When the invention is used, the openness of the throttle valve can be manually adjusted to adjust the sliding speed of the damping cylinder plug, and therefore, the invention has the characteristic of optimal closing applicable to the transportation state of liquid.

Description

technical field [0001] The invention relates to an axial flow check valve, in particular to a valve core damping device of the axial flow check valve. Background technique [0002] A check valve is a valve that opens and closes with the flow of fluid. The check valve is installed on the fluid pipeline to allow the fluid to flow in only one direction, and the check valve can automatically close when the fluid in the fluid pipeline flows backwards. The load of the check valve changes greatly when it is closed, and the closing characteristics of the check valve affect the hydrodynamic parameters in the pipeline. When the check valve is closed, it is generally required that the check valve responds quickly, that is, it is closed quickly when the fluid medium flows back, and the backflow fluid medium is cut off, but if it is closed too fast, the flow rate of the fluid medium in the pipeline will change from the maximum backflow velocity Rapidly drop to zero, the kinetic energy ...

AI Technical Summary

Problems solved by technology

There is no damping device on the spool of this check valve. When the fluid flows backwards, the spool slides quickly to the valve seat to close the check valve, and water hammer will occur when it is closed.

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