Stop valve

Abstract

The invention discloses a stop valve which comprises a first stop valve and a second stop valve, and the first stop valve and the second stop valve are consistent in structure and size. According to the stop valve, the first stop valve body and the second stop valve body are fixed through the fixing assemblies on the two sides, similarly, the stop valves can be additionally installed on the lower portion of the second stop valve body, the corresponding number of stop valves can be additionally installed according to needs, and transmission is conducted between the stop valves through the transmission assembly; the stop valves on the lower portion can be driven to conduct communication control by controlling the uppermost first stop valve to rotate, starting of the multiple stop valves can be completed by controlling one stop valve, when the stop valves are installed in advance, the stop valves can be controlled to be in the open state or the closed state, and if the upper stop valve and the lower stop valve are in the open state and the closed state respectively, the stop valves can be started. When the upper portion is opened, the lower portion is closed in a linkage mode, the communication state can be achieved, and the device is suitable for different use environments.

Description

technical field [0001] The invention relates to the field of stop valves, in particular to a stop valve. Background technique [0002] Globe valve, also known as cut-off valve, is a forced sealing valve, so when the valve is closed, pressure must be applied to the disc to force the sealing surface not to leak. When the medium enters the valve from the bottom of the disc, the resistance that the operating force needs to overcome is the friction between the valve stem and packing and the thrust generated by the pressure of the medium. The force to close the valve is greater than the force to open the valve, so the valve stem The diameter of the valve must be large, otherwise the failure of the valve stem to bend will occur. According to the connection method, it can be divided into three types: flange connection, screw connection and welding connection. After the emergence of self-sealing valves, the flow direction of the medium of the globe valve is changed to enter the val...

AI Technical Summary

Problems solved by technology

[0003] This application improves the prior art. The stop valve in the prior art generally uses a single valve to control a single pipeline. However, in the existing pipelines, it is necessary to control the start and stop of multiple pipelines at the same time. At this time, only one by one can be used. The valve is closed, and sometimes it is necessary to close the upper pipeline and open the lower pipeline at the same time, the stop valve cannot function the linkage start-stop effect

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