Axial-flow-type switch valve

Abstract

The invention discloses an axial-flow-type switch valve, and belongs to the technical field of valves. The axial-flow-type switch valve comprises a first flange connecting sleeve, an executing mechanism piston cylinder and a second flange connecting sleeve which are mutually connected. A piston-type driving mechanism is arranged in the executing mechanism piston cylinder, the piston-type driving mechanism comprises a valve element of a cylindrical structure and a piston connected with the outer side of the valve element in a sleeved mode, a piston is in elastic matching with a spring pad arranged in the executing mechanism piston cylinder, one end of the valve element is in sealing matching with the first flange connecting sleeve, and the other end of the valve element is matched with a valve seat arranged in the second flange connecting sleeve. According to the axial-flow-type switch valve, the mode that an executing mechanism, the piston, the valve element, the valve seat and the flange connecting sleeves are coaxially combined is adopted, the valve structure design concept that in the prior art, an executing mechanism can only be arranged outside a valve body is broken through, and the defects that an existing piston-type executing mechanism is large in friction force, low in response speed, low in adjusting precision and large in leakage rate are overcome.

Description

technical field [0001] The invention belongs to the technical field of valves, and in particular relates to an axial flow opening and closing valve. Background technique [0002] In the prior art, the actuators of the valves are all designed outside the valve body, and the structure is huge; the design needs to consider the minimum working pressure difference, and the valve can only be used as a one-way flow with high inflow and low outflow or low inflow and high outflow. The sealing surface of the valve in the dirty medium is very easy to be damaged, and the valve will fail; the switching speed of the conventional valve cannot always respond quickly due to the structural relationship of the valve. Therefore, the disadvantages of the existing valves are: this type of valve can only be used in a vapor-liquid state with a relatively clean medium, and the minimum pressure difference of the valve needs to be provided, and it can only be used as a working condition where the one-...

AI Technical Summary

Problems solved by technology

[0002] In the prior art, the actuators of the valves are all designed outside the valve body, and the structure is huge; the design needs to consider the minimum working pressure difference, and the valve can only be used as a one-way flow with high inflow and low outflow or low inflow and high outflow. The sealing surface of the valve in the dirty medium is very easy to be damaged, and the valve will fail; the switching speed of the conventional valve cannot always respond quickly due to the structural relationship of the valve

Therefore, the disadvantages of the existing valves are: this type of valve can only be used in a vapor-liquid state with a relatively clean medium, and the minimum pressure difference of the valve needs to be provided, and it can only be used as a working condition where the one-way flow response speed is not high; especially in the installation In the case of small space, the pipeline can be changed on site because it cannot be installed

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