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LT942X Piston Flow Control Valve Piston flow control valve adjustment mechanism should be crank-slider mechanism, the closure of the slider is a cylindrical or tapered piston. In the cylinder inside the cylinder guided by the guide along the center of the pipeline for axial movement, thus changing the flow area, in order to achieve regulation of flow and decompression. Connection with the pipe flange connection, flange connection size, the length of the structure in line with the corresponding GB requirements.