Control elements (ie all kinds of hydraulic fittings valves) in the hydraulic fittings system to control and regulate fluid pressure, flow and direction. Under the control of different hydraulic fittings pressure control valve can be divided into valves, flow control valves and directional control valves. Pressure control valve is divided into pressure relief valve (safety valve), reducing valves, sequence valves, pressure switch, etc.; flow control valves including throttle, adjusting the valve, diverting flow valve assembly; directional control valves, including one-way valve , check valve, shuttle valve, valve and so on. Different ways under control, hydraulic control valve can be divided into switching valves, control valves and set the value of proportional control valves. Auxiliary components including fuel tank, filter, tubing and pipe joints, seals, pressure gauge, oil level, oil temperature meter, etc.. Hydraulic oil is a hydraulic fittings system transmits energy to the work of the media, there are all kinds of mineral oil, hydraulic fittings oil emulsion Hop forming broad categories. To introduce the following classification of hydraulic fittings.

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