What are the classifications of hydraulic components

Power components - gear pumps, vane pumps, plunger pumps, screw pumps, etc; Execution components - hydraulic cylinders: piston hydraulic cylinder, plunger hydraulic cylinder, swing hydraulic cylinder, combination hydraulic cylinder, etc; Hydraulic motors: gear hydraulic motors, blade hydraulic motors, plunger hydraulic motors, etc; Control components - directional control valves: one-way valves, directional valves, etc; Pressure control valves: overflow valves, pressure reducing valves, sequence valves, pressure relays, etc; Flow control valves: throttle valves, speed regulating valves, diversion valves, etc; Auxiliary components - accumulator, filter, cooler, heater, oil pipe, pipe joint, oil tank, pressure gauge, flow meter, sealing device, etc