Choke valve is a valve that controls the flow of a fluid by changing a throttle section or a throttle length. The choke valve and the check valve are connected in parallel to form a one-way choke valve. The choke valve and the one-way choke valve are simple flow control valves. In the hydraulic system of the fixed pump, the choke valve and the relief valve cooperate to form three throttling speed control systems, that is, the throttle speed regulation System, return oil throttle control system and bypass throttle speed control system.

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