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Regulating the speed of a flowing medium through a flow cross section down to zero is the talk of check valves. In the choke valve, one-way flow control valve, seat valve, or spool valve designs, they are suitable for very fine, precise setting of flow rates and cylinder speeds. A distinction is made between mechanical and pneumatic activation and electromotive and electromechanical drive, depending on how the moving parts are driven. They are used in lines or other hydraulic components to regulate inlet, flow, and outlet of hydraulic fluid.