Axial-flow type check valve

Abstract

The invention discloses an axial-flow type check valve. The axial-flow type check valve comprises a valve body. A valve cavity is formed in the valve body. A valve deck is fixedly installed at the position, on an opening in the right end of the valve cavity, of the valve body. An outlet pipe communicating with the valve cavity is arranged on the left side of the valve body, and an inlet pipe communicating with the valve cavity is arranged in the valve deck. A valve element cylinder with an opening in the right end is arranged on the inner side wall of the valve cavity, a mounting block is arranged on the inner side wall of the valve element cylinder, a valve rod is connected in the mounting block in a sliding manner, and a valve element block used for controlling on-off of the inlet pipe is arranged at the right end of the valve rod. A protruding block is arranged at the left end of the valve rod, and a rotation stopping rod stretching into the protruding block is arranged on the leftside of the mounting block. The valve rod is sleeved with a first spring between the mounting block and the valve element block, and the first spring is used for forcing the valve element block to press the inlet pipe. A buffer assembly is arranged at the left end of the valve element cylinder, and a locking assembly is arranged on the protruding block. The check valve is simple in structure and can be slowly closed, and the water hammer phenomenon is prevented.

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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