Axial flow type check valve

Abstract

The invention relates to an axial flow type check valve which comprises a valve body, a valve element, a plurality of locking assemblies, a buffer tension spring and a plurality of locking rods. A valve cavity is formed in the valve body, an inlet pipe communicated with the valve cavity is arranged at the right side of the valve body, and an outlet pipe communicated with the valve cavity is arranged at the left side of the valve body; a first mounting cavity communicating with the outlet pipe is horizontally formed in the left portion of the valve cavity, the valve element is slidably connected into the first mounting cavity through a flat key, and a valve clack is arranged at the right side of the valve element; one end of the buffer tension spring is fixedly connected to the valve body,the other end of the buffer tension spring is fixedly connected to the valve element, and the buffer tension spring forces the valve element to move leftwards; the valve clack is provided with the plurality of locking rods in the circumferential direction, and the axes of the locking rods are perpendicular to the axis of the valve clack; and in the valve body, a second mounting cavity corresponding to each lock rod is formed in the right side of the lock rod, and the corresponding locking assembly is arranged at the left side of each second mounting cavity. By means of the axial flow type check valve, a buffer assembly is arranged, so that water hammering can be prevented, impact is reduced, and the service life of the valve clack is prolonged; and when the valve clack is completely closed, the multiple locking assemblies completely lock the valve clack, sealing of the valve clack cannot be affected, and the valve clack can be reliably closed and sealed.

Description

technical field [0001] The invention belongs to the technical field of pipeline valves, in particular to an axial flow check valve. Background technique [0002] The axial flow check valve is favored by engineering design because of its strong flow capacity, small flow resistance, no jamming in opening and closing, and reliable sealing. According to the classification of the valve core structure, the axial flow check valve can be divided into ring type and disc type. Working principle of axial flow check valve: The opening and closing of the disc is determined by the pressure difference between the inlet and outlet of the valve. When the pressure at the inlet port is greater than the sum of the pressure at the outlet port and the spring force, the disc opens. The following problems often occur during the use of existing axial flow check valves: during the closing process of the valve clack, due to the fast closing speed, the impact force of the valve clack sealing surface ...

AI Technical Summary

Problems solved by technology

The following problems often occur during the use of existing axial flow check valves: during the closing process of the valve clack, due to the fast closing speed, the impact force of the valve clack sealing surface on the sealing surface of the valve seat will be too large, which is easy to damage The sealing surface prevents the check valve from effectively shutting off and reduces the service life; at the same time, when the check valve disc is closed quickly, it is easy to generate water hammer, which leads to the occurrence of harmful situations such as damage to the valve.

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